N-CSR 1 chw-ncsr_103120.htm CERTIFIED ANNUAL SHAREHOLDER REPORT

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-CSR

CERTIFIED SHAREHOLDER REPORT OF REGISTERED

MANAGEMENT INVESTMENT COMPANIES

INVESTMENT COMPANY ACT FILE NUMBER: 811-22047

EXACT NAME OF REGISTRANT AS SPECIFIED IN CHARTER: |  |  |  | Calamos Global Dynamic Income Fund
ADDRESS OF PRINCIPAL EXECUTIVE OFFICES: |  |  |  | 2020 Calamos Court Naperville, Illinois 60563-2787
NAME AND ADDRESS OF AGENT FOR SERVICE: |  |  |  | John P. Calamos, Sr., Founder, Chairman and Global Chief Investment Officer Calamos Advisors LLC 2020 Calamos Court Naperville, Illinois 60563-2787

REGISTRANT’S TELEPHONE NUMBER, INCLUDING AREA CODE: (630) 245-7200

DATE OF FISCAL YEAR END: October 31, 2020

DATE OF REPORTING PERIOD: November 1, 2019 through October 31, 2020

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ITEM 1. REPORT TO SHAREHOLDERS.

TIMELY INFORMATION INSIDE

Global Dynamic Income Fund (CHW)

Annual REPORT October 31, 2020

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Beginning on March 1, 2021, as permitted by regulations adopted by the Securities and Exchange Commission, paper copies of the Funds’ shareholder reports will no longer be sent by mail, unless you specifically request paper copies of the reports from the Fund or from your financial intermediary. Instead, the reports will be made available on a website, and you will be notified by mail each time a report is posted and provided with a website link to access the report.

If you already elected to receive shareholder reports electronically, you will not be affected by this change and you need not take any action. You may elect to receive shareholder reports and other communications from the Fund electronically by calling 800.582.6959. If you own these shares through a financial intermediary, you may contact your financial intermediary.

You may elect to receive all future reports in paper free of charge. You can inform the Fund that you wish to continue receiving paper copies of your shareholder reports by calling 800.582.6959. If you own these shares through a financial intermediary, you may contact your financial intermediary or follow instructions included with this disclosure to elect to continue to receive paper copies of your shareholder reports. Your election to receive reports in paper will apply to all funds held with the fund complex or your financial intermediary.

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TABLE OF CONTENTS

Letter to Shareholders | 1
The Calamos Closed-End Funds: An Overview | 5
Investment Team Discussion | 6
Fund's Investment Objective, Principal Investment Strategies and Principal Risks; Important Updates About the Fund | 10
Schedule of Investments | 24
Statement of Assets and Liabilities | 39
Statement of Operations | 40
Statements of Changes in Net Assets | 41
Statements of Cash Flows | 42
Notes to Financial Statements | 43
Financial Highlights | 51
Report of Independent Registered Public Accounting Firm | 52
Trustee Approval of Management Agreement | 53
Tax Information | 55
Trustees and Officers | 56
About Closed-End Funds | 58
Level Rate Distribution Policy | 59
Automatic Dividend Reinvestment Plan | 59

CALAMOS CLOSED-END FUNDS

Innovative Solutions for the Search for Income

About Calamos Investments:

•Our experience as an innovator in dynamically allocated closed-end funds extends back to 2002.

•Calamos total-return and enhanced-fixed-income funds can meet a range of investor needs.

•Our funds offer competitive distributions through a multi-asset-class approach and strategies that have been less dependent on interest rates.

•Distribution policies seek to provide steady monthly income.

•We currently manage more than $7.8 billion in seven closed-end funds as of October 31, 2020.

For more information about any Calamos closed-end funds, we encourage you to contact your investment professional or Calamos Investments at 800.582.6959 (Monday through Friday from 8:00 a.m. to 6:00 p.m., Central Time). You can also visit us at www.calamos.com.

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Letter to Shareholders

John P. calamos, sr.

Founder, Chairman
and Global Chief
Investment Officer

CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 1

Dear Fellow Shareholder:

Welcome to your annual report for the 12-month period ended October 31, 2020. I n th is report, you will find commentary from the Calamos portfolio management team, as well as a listing of portfolio holdings, financial statements and highlights, and detailed information about the performance and positioning of the Calamos Fund.

Finding Stable Income in a Low-Yield, High-Volatility World

For many, this appears a tall order. Traditional bond funds and passive strategies such as ETFs are likely to face headwinds in a volatile, low-rate environment. However, I believe Calamos closed-end funds are well positioned to address the search for stable income in a low-yield, high-volatility world. The funds are differentiated by their dynamic allocation and multi-asset class approaches, which offer considerable potential benefits for investors seeking income and capital appreciation. What’s more, our funds are actively managed, and can adjust to the changing risks and opportunities in the market.

During the period, the Fund provided a compelling monthly distribution of $0.0700 per share. We believe the Fund’s current annualized distribution rate, which was 10.77%* on a market price basis as of October 31, 2020, was very competitive, given the low interest rates in many segments of the bond market.

We understand that many closed-end fund investors seek steady, predictable distributions. With the Fund's level rate distribution policy, we aim to keep distributions consistent from month to month, and at a level that we believe can be sustained over the long term. In setting the Fund's distribution rate, the investment management team and the Fund's Board of Trustees consider the interest rate, market and economic environment. We also factor in our assessments of individual securities and asset classes.

*Current Annualized Distribution Rate is the Fund’s most recent distribution, expressed as an annualized percentage of the Fund’s current market price per share. The Fund’s 10/31/20 distribution was $0.0700 per share. Based on our current estimates, we anticipate that approximately $0.0700 is paid from ordinary income or capital gains and that approximately $0.0000 represents a return of capital. Estimates are calculated on a tax basis rather than on a generally accepted accounting principles (GAAP) basis, but should not be used for tax reporting purposes. Distributions are subject to re-characterization for tax purposes after the end of the fiscal year. This information is not legal or tax advice. Consult a professional regarding your specific legal or tax matters. Under the Fund’s level rate distribution policy, distributions paid to common shareholders may include net investment income, net realized short-term capital gains, and return of capital. When the net investment income and net realized short-term capital gains are not sufficient, a portion of the distribution will be a return of capital. In addition, a limited number of distributions per calendar year may include net realized long-term capital gains. The distribution r ate may var y.

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Letter to Shareholders

2 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT

Market Review

The 12 months ending October 31, 2020, have been an extraordinary time for investors. As the reporting period began, market sentiment was generally upbeat as investors focused on supportive Federal Reserve policy and signs of progress in U.S.-China trade negotiations. The tide changed dramatically soon after the start of 2020, as Covid-19 swept across the globe. As countries sought to contain the pandemic through lockdowns and social distancing, economic activity and markets plummeted. U.S. and global stock markets both fell more than 30% in the span of a few weeks,1 oil prices plunged as demand collapsed, and U.S. Treasu ry yields reached new lows as investors turned to investments with greater perceived safety.

Central banks and governments took decisive steps in response to the rapidly unfolding global health crisis. Sweeping measures provided market liquidity and support to businesses and households. Investor sentiment improved quickly as a result, and financial markets rebounded dramatically.2 Global economies began to reopen, with monetary and fiscal policy providing tailwinds to recovery. Yet, even during this upswing, markets remained volatile due to uncertainty surrounding the pandemic and the potential fiscal policy impacts of looming U.S. elections.

Outlook

2020 has been unprecedented in its challenges, but it has also provided many examples that illustrate the ingenuity and adaptability of humankind, as well as the resilience of the global economy and markets. At th e time of this writing, companies are releasing exciting announcements about the high efficacy of vaccine trials. GDP numbers and many other data points provide an encouraging picture of an economic recovery that may proceed faster than many expected. Many businesses are exceeding the earnings expectations of Wall Street analysts, significant numbers of people are returning to work, mortgage rates are low, and consumer balance sheets are in good shape. U.S. election results point to a divided Washington D.C., which can set the stage for more moderate economic plans that support job creation and the health of businesses of all sizes, and by extension investment opportunities.

As always, fiscal policy will have a significant impact on the economic environment and will be key to navigating the many challenges that still lie ahead. For example, in the U.S., not all segments of the economy are healing at an even pace and many households and businesses remain under pressure. Covid-19 cases continue to rise, putting more strain not only on health care systems, but also economies and households. Appropriate fiscal policy and levels of regulation are of paramount importance.

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Letter to Shareholders

CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 3

We are entering a new period of opportunity in the global financial markets. Throughout much of 2020, a ha ndful of large-cap technology companies enjoyed the lion’s share of market attention. As the recovery continues and the world makes meaningful strides toward defeating Covid-19, a very different landscape can quickly emerge, with new investment themes gaining strength. This is an environment that favors risk-aware bottom-up security selection, guided by rigorous fundamental research and an understanding of the thematic forces shaping the world.

The Importance of Long-Term Perspective

Over recent weeks, we have seen quick swings in the market and expect the next months to bring continued volatility, including leadership rotation, episodic selloffs and rebounds. November’s election results and recent vaccine news give greater clarity, but the markets will grapple with uncertainty related to the timing of vaccine rollouts, as well as the specifics of fiscal policy changes under a new presidential administration.

Since I began investing in the difficult financial markets of the 1970s, I have learned that volatility creates opportunity for those who are prepared, disciplined and guided by long-term focus. While remaining firmly grounded in long-term fundamentals, the team actively uses volatility to enhance the risk/reward characteristics of the Fund.

As always, I’d caution investors against letting emotion drive investment decisions. Making moves based on either fear or greed, without a longer-term plan, increases the likelihood of getting whipsawed in volatile markets. Instead, work with your investment professional to ensure that your asset allocation makes sense for your risk tolerance and investment objectives. In rotational and volatile markets, diversification is especially important, and your investment professional may recommend making strategic enhancements to your asset allocation to capitalize on evolving opportunities.

For decades, Calamos Investments has been dedicated to helping investors pursue their financial goals, including through uncertain environments. Now more than ever during this crisis, we believe the case is strong for staying invested and utilizing Calamos closed-end funds.

Calamos closed-end funds have the flexibility to invest in a wide array of securities with income and appreciation potential. These include stocks, convertible securities, high yield bonds and preferred securities. These asset classes have been less dependent on interest rates to source income. Additionally, certain Calamos closed-end funds employ alternative strategies (such as long/short equity and options writing) to source income and total returns.

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Letter to Shareholders

4 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT

In closing, all of us at Calamos Investments thank you for your trust. We are honored you have chosen a Calamos Fund to help you achieve your asset allocation goals.

Sincerely,

John P. Calamos, Sr.
Founder, Chairman and Global Chief Investment Officer

Before investing, carefully consider a fund’s investment objectives, risks, charges and expenses. Please see the prospectus containing this and other information or call 800.582.6959. Please read the prospectus carefully. Performance data represents past performance, which is no guarantee of future results. Current performance may be lower or higher than the performance quoted. Opinions are as of the publication date, subject to change and may n ot come to pass. Information is for informational purposes only and shouldn’t be considered investment advice.

Diversification and asset allocation do not guarantee a profit or protection against a loss.

1 The MSCI All Country World Index is a measure of global stock market performance, which returned -33.60% from February 20, 2020 to March 23, 2020. The S&P 500 Index is a measure of the U.S. stock market, which returned -33.79% from February 20, 2020 to March 23, 2020. The MSCI Emerging Market Index is a measure of emerging market equity performance, which returned -31.15% from February 20, 2020 to March 23, 2020. February 20, 2020 represents a peak in the S&P 500 and March 23, 2020 represents a trough.

2 From March 24, 2020 to October 31, 2020, the MSCI All Country World Index returned 45.52%, the S&P 500 Index returned 47.71%, and the MSCI Emerging Market Index returned 48.27%. The ICE BofA All U.S. Convertibles Index represents the U.S. convertible securities market. The index returned 52.73% from March 24, 2020 to October 31, 2020. The Refinitiv Global Convertible Bond Index is designed to broadly represent the global convertible bond market. The index returned 41.43% from March 24, 2020 to Octo ber 31, 20 20. The Bloomberg Barclays U.S. High Yield 2% Issuer Capped Index measures the performance of high yield corporate bonds with a maximum allocation of 2% to any one issuer. The index returned 25.99% from March 24, 2020 to October 31, 2020. The Bloomberg Barclays U.S. Aggregate Bond Index is considered generally representative of the U.S. investment-grade bond market. The index returned 5.22% from March 24, 2020 to October 31, 2020.

Source: Lipper, Inc. and Mellon Analytical Solutions, LLC. Unmanaged index returns assume reinvestment of any and all distributions and, unlike fund returns, do not reflect fees, expenses or sales charges. Investors cannot invest directly in an index. Returns are in U.S. dollar terms.

Investments in overseas markets pose special risks, including currency fluctuation and political risks. These risks are generally intensified for investments in emerging markets. Countries, regions, and sectors mentioned are presented to illustrate countries, regions, and sectors in which a fund may invest. Fund holdings are subject to change daily. The Funds are actively managed. The information contained herein is based on internal research derived from various sources and does not purport to be statements of all material facts relating to the securities mentioned. The information contained herein, while not guaranteed as to accuracy or completeness, has been obtained from sources we believe to be reliable. There are certain risks involved with investing in convertible securities in addition to market risk, such as call risk, dividend risk, liquidity risk and default risk, which should be carefully considered prior to investing.

This information is being provided for informational purposes only and should not be considered investment advice or an offer to buy or sell any security in the portfolio. Investments in alternative strategies may not be suitable for all investors.

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The Calamos Closed-End Funds: An Overview

CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 5

In our closed-end funds, we draw upon decades of investment experience, including a long history of opportunistically blending asset classes in an attempt to capture upside potential while seeking to manage downside risk. We launched our first closed-end fund in 2002.

Closed-end funds are long-term investments. Most focus on providing monthly distributions, but there are important differences among individual closed-end funds. Calamos closed-end funds can be grouped into multiple categories that seek to produce income while offering exposure to various asset classes and sectors.

Portfolios Positioned to Pursue High Current Income from Income and Capital Gains | ​ | ​ | Portfolios Positioned to Seek Current Income, with Increased Emphasis on Capital Gains Potential
OBJECTIVE: U.S. ENHANCED FIXED INCOME Calamos Convertible Opportunities and Income Fund (Ticker: CHI) Invests in high yield and convertible securities, primarily in U.S. markets Calamos Convertible and High Income Fund (Ticker: CHY) Invests in high yield and convertible securities, primarily in U.S. markets OBJECTIVE: GLOBAL ENHANCED FIXED INCOME Calamos Global Dynamic Income Fund (Ticker: CHW) Invests in global fixed income securities, alternative investments and equities | ​ | ​ | OBJECTIVE: GLOBAL TOTAL RETURN Calamos Global Total Return Fund (Ticker: CGO) Invests in equities and higher-yielding convertible securities and corporate bonds, in both U.S. and non-U.S. markets Calamos Long/Short Equity & Dynamic Income Trust (Ticker: CPZ) Invests in a globally diversified long/short portfolio of equity securities as well as globally diversified income-producing securities OBJECTIVE: U.S. TOTAL RETURN Calamos Strategic Total Return Fund (Ticker: CSQ) Invests in equities and higher-yielding convertible securities and corporate bonds, primarily in U.S. markets Calamos Dynamic Convertible and Income Fund (Ticker: CCD) Invests in convertibles and other fixed income securities

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Investment Team Discussion

6 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT

TOTAL RETURN* AS OF 10/31/20

Common Shares – Inception 6/27/07
| 1 Year | Since Inception**
On Market Price | 7.60% | 5.24%
On NAV | 14.00% | 5.83%
* Total return measures net investment income and net realized gain or loss from Fund investments, and change in net unrealized appreciation and depreciation, assuming reinvestment of income and net realized gains distributions. **Annualized since inception.

SECTOR WEIGHTINGS

Information Technology | 19.8%
Consumer Discretionary | 18.1
Industrials | 10.6
Financials | 9.9
Communication Services | 9.6
Health Care | 9.4
Materials | 5.5
Energy | 5.4
Consumer Staples | 4.1
Utilities | 3.0
Real Estate | 1.6
Other | 0.6
Airlines | 0.2

Sector Weightings are based on managed assets and may vary over time. Sector Weightings exclude any government/sovereign bonds or options on broad market indexes the Fund may hold.

Global DYNAMIC INCOME Fund (CHW)

INVESTMENT TEAM DISCUSSION

Please discuss the Fund’s strategy and role within an asset allocation.

Calamos Global Dynamic Income Fund (CHW) is a global enhanced fixed-income offering that seeks to provide an attractive monthly distribution with a secondary objective of capital appreciation. We believe it offers a diversified way to participate in the long-term potential of global markets.

In this portfolio, we draw upon our team’s wide-ranging experience in an array of asset classes. We utilize what we believe is a highly flexible approach, investing in equities, convertible securities and high yield securities. We also can employ alternative strategies such as covered call writing and convertible arbitrage. Through covered call writing, we seek to generate income by selling (“writing”) options on market indexes. In the convertible arbitrage strategy, we invest in convertible securities and short sell the convertibles’ underlying equities to generate income and hedge against risk.

We believe that this broad mandate enhances our ability to capitalize on market volatility, manage potential downside risks and generate more income versus traditional fixed-income funds. The allocation to each asset class and strategy is dynamic, and it reflects our view of the economic landscape and the potential of individual securities. By combining asset classes and strategies, we believe that we are well positioned to generate income and capital gains. The broader range of security types also provides us with increased opportunities to manage the risk/reward characteristics of the portfolio over full market cycles. For the period, our exposure to the equity markets was beneficial to the overall performance of the Fund.

We invest in both U.S. and non-U.S. companies, with at least 40% of assets invested in non-U.S. companies. We emphasize companies with reliable debt servicing, respectable balance sheets and sustainable prospects for growth. Regardless of a company’s country of domicile, we favor companies with geographically diversified revenue streams and global business strategies.

How did the Fund perform over the reporting period?

The Fund returned 14.00% on a net asset value (NAV) basis for the 12-month period ended October 31, 2020. On a market price basis, the Fund returned 7.60%. For the sake of comparison with the broader global markets, the MSCI EAFE Index returned -5.66%, the MSCI World Index returned 4.91%, and the S&P 500 Index gained 9.71% during the period.

At the end of the reporting period, the Fund’s shares traded at a -2.86% discount t o NAV.

How do NAV and market price return differ?

Closed-end funds trade on exchanges, where the price of shares may be driven by factors other than the value of the underlying securities. The price of a share in the market is called market value. Market price may be influenced by factors unrelated to the performance of the fund’s holdings, such as general market sentiment or future expectation. A fund’s NAV return measures the actual return of the individual securities in the portfolio, less fund expenses. It also measures how a manager was able to capitalize on market opportunities. Because we believe closed-end funds are

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Investment Team Discussion

CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 7

best-utilized long-term within asset allocations, we believe that NAV return is the better measure of a fund’s performance. However, when managing the fund, we strongly consider actions and policies that we believe will optimize its overall price performance and returns based on market price.

SINCE INCEPTION MARKET PRICE AND NAV HISTORY THROUGH 10/31/20

Performance data quoted represents past performance, which is no guarantee of future results. Current performance may be lower or higher than the performance quoted. The principal value of an investment will fluctuate so that your shares, when sold, may be worth more or less than their original cost. Returns at NAV reflect the deduction of the Fund’s management fee, debt leverage costs and all other applicable fees and expenses. You can obtain performance data current to the most recent month end by visiting www.calamos.com.

Please discuss the Fund’s distributions during the one-year period.

We employ a level rate distribution policy within this Fund with the goal of providing shareholders a consistent distribution stream. In each month of the period, the Fund distributed $0.0700 per share, resulting in a current annualized distribution rate of 10.77% of market price as of October 31, 2020.

We believe that both the Fund’s distribution rate and level remained attractive and competitive, as low interest rates have limited yield opportunities in much of the marketplace. For example, as of October 31, 2020, the dividend yield of S&P 500 Index stocks averaged approximately 1.72%. Yields were also low within the U.S. government bond market, with the 10-year U.S. Treasury and 30-year U.S. Treasury yielding 0.88% and 1.65%, respectively.

What factors influenced performance over the reporting period?

The Fund maintained its exposure to the equity markets, and its allocations to both convertibles and high yield bonds provided income to the portfolio for the period. The strength and performance of the global convertible market especially buoyed NAV performance for the period. Price performance, however, was muted relative to the advancements of the underlying portfolio due to high levels of market volatility throughout 2020, spurred by concerns regarding the continuity of distribution levels, tax loss selling, the impact of US elections on markets, and the eventual reopening of the economy in the wake of COVID-19.

The Fund has the ability to invest in a range of strategies including convertible securities, high yield, U.S. equities, international equities, and convertible arbitrage. This enables us to participate in a myriad of opportunities on behalf of our shareholders. Given this flexibility, we were able to maintain our exposure to the equity markets through our convertible holdings, which enabled us to participate in the general upward trajectory of equities. Broad improvements in both domestic and global equity as well as fixed income markets contributed to the Fund’s strong performance over the period.

ASSET ALLOCATION AS OF 10/31/20

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Investment Team Discussion

8 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT

The Fund’s U.S. equity sleeve outperformed relative to the S&P 500 Index as selection and an overweight in consumer discretionary (casinos and gaming), contributed to performance. In addition, our selection in communication services (interactive media and services) was additive.

Conversely, our general underweight in utilities but an overweight in electric utilities impeded performance relative to the index. In addition, our selection in industrials (aerospace and defense) was not helpful.

The Fund’s global equity sleeve outperformed relative to the MSCI World Index. Our selection and overweight in consumer discretionary, namely in automobile manufacturers, was helpful. Our overweight and selection in communication services, especially in interactive media services, also proved beneficial.

Conversely, our selection and underweight in materials, an avoidance of industrial gases, weighed on performance. In addition, our selection in utilities, specifically in multi-sector utilities, also weighed on results.

The Fund’s international sleeve outperformed relative to the MSCI EAFE Index. Our overweight and selection in materials, specifically an overweight in gold, was beneficial relative to the index. In addition, selection and an overweight in communication services, namely an overweight in interactive home entertainment, was helpful.

Conversely, an underweight and selection in information technology, although specifically in technology hardware, storage and peripherals, impeded performance relative to the MSCI EAFE Index. In addition, our overweight in energy, notably in oil & gas exploration & production, was detrimental to performance.

The convertible arbitrage portion benefited from increasing volatility and a significant increase in new convertible issuance. According to ICE BofA, $90.1 billion of new convertible issuance was brought to market in 2020 through October 31. This amount far surpassed the $53.1 billion in the full calendar year 2019 and put 2020 on pace to exceed the most new issuance witnessed since before 1998. The new convertibles issued during the period were attractive for convertible arbitrage as they represented the balanced portion of the market, which when combined with elevated volatility, increased opportunities for trade rebalancing. In addition, much of the new issuance was brought to market at a discount to the convertible’s theoretical valuation, providing an opportunity for pricing arbitrage.

How is the Fund positioned?

We continued to find opportunities across asset classes. We maintained a preference for larger-cap, growth-oriented companies with global presence and geographically diversified revenue streams to offset the economic impact of COVID-19. We believe that such companies are particularly well positioned to capitalize on selective global and overall U.S. growth trends we see as the global economy begins to recover from the impact of Covid-19. In keeping with an emphasis on risk management, we focus on companies that we believe have respectable balance sheets, solid free cash flows, and good prospects for sustainable growth as a result of increasing consumer confidence and fiscal stimulus as they are able to provide reliable debt servicing.

The portfolio’s largest allocations—in absolute terms—reside in the information technology, consumer discretionary and communication services sectors.

We believe that these sectors should be poised to perform well as technology offers solutions to help people across the global economy work and socialize virtually out of

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Investment Team Discussion

CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 9

necessity. We believe that the global consumer will benefit from increased stimulus and the release of pent-up demand as the global economy begins to reopen in the wake of COVID-19.

Concerning communication services, we believe that companies in the sector should benefit from improving economic conditions highlighted by higher employment, improved consumer sentiment and relatively low interest rates. This sector should also benefit from an increasingly virtual work and social environment in the wake of COVID-19. Conversely, we are maintaining relatively low exposures to utilities and consumer staples, which we believe may be fully valued at this point in the cycle.

As noted, we pursue a risk-managed approach to total return, though the Fund’s portfolio includes a blend of high-yield and investment-grade credits. We take a very selective approach to unrated securities credits, ever mindful of suitability for our closed-end fund clients. We believe it is particularly important to favor companies that offer the best prospects for reliable debt servicing.

We believe that this is an environment that is conducive to the prudent use of leverage as a means to enhance total return and supporting the fund’s distribution rate. Over the period, our use of leverage enjoyed a favorable reinvestment dynamic. As of October 31, 2020, our approximate amount of leveraged assets was 31%.

What are your closing thoughts for Fund shareholders?

Given our outlook for a more balanced economic recovery—as COVID-19 is soon mitigated with vaccines, and the impact of the U.S. election on markets achieves clarity—we are favoring quality-growth companies poised to participate in the optimism and spending power of the U.S. consumer. Moreover, we are emphasizing investments in businesses with solid cash-flow generation and stronger balance sheets. However, we are mindful of increased volatility, and our active management is imperative to managing risk and optimizing opportunities.

From a thematic and sector perspective, we see opportunities in the technology and consumer services sectors as a more virtual world continues to advance post COVID-19. We believe that health care companies tied largely to vaccines and disease prevention will perform well. We also hold an optimistic view of consumer discretionary stocks; we believe they are favorably valued and positioned to grow revenues given the improved wellbeing of the U.S consumer and further fiscal stimulus. We also favor cyclicals that have lagged much of the initial recovery in 2020, but can now participate in a more balanced recovery. However, we are cautious about companies in the consumer staples sector, which may be fully valued because investors flock to those stocks for income rather than growth. We believe that the high issuance of convertibles will continue to present opportunities in a broader array of sectors and geographical locales.

We believe our active investment approach positions us to take advantage of the volatility and opportunities in global equities and convertible securities. We emphasize risk-managed returns, especially as we expect continued volatility spawned by geopolitical issues to continue into 2021.

The Fund’s use of derivative instruments involves investment risks and transaction costs to which the Fund would not be subject absent the use of these instruments and, accordingly, may result in losses greater than if they had not been used. Derivative instruments can be illiquid, may disproportionately increase losses and may have a potentially large impact on Fund performance.

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Calamos Global Dynamic Income Fund (CHW) (unaudited)

10 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT

The Fund’s Investment Objective, Principal INVESTMENT Strategies and Principal Risks; and Important Updates About the Fund

Investment Objective

The Fund’s investment objective is to generate a high level of current income with a secondary objective of capital appreciation.

Principal Investment Strategies

Under normal circumstances, the Fund will invest primarily in a globally diversified portfolio of convertible instruments, common and preferred stocks, and income-producing securities such as investment grade and below investment grade (high yield/high risk) debt securities. The Fund may also incorporate other income-producing strategies, including options, swaps and other derivative instruments, for both investment and hedging purposes. The Fund, under normal circumstances, will invest at least 40% of its managed assets in securities of foreign issuers in developed and emerging markets, including debt and equity securities of corporate issuers and debt securities of government issuers. “Managed assets” means the Fund’s total assets (including any assets attributable to any leverage that may be outstanding) minus total liabilities (other than debt representing financial leverage).

The Fund will maintain a balanced approach to geographic portfolio diversification. The Fund may invest up to 100% of its managed assets in securities of foreign issuers in developed and emerging markets, including debt and equity securities of corporate issuers and debt securities of government issuers.

The Fund will use a number of investment strategies to achieve its objectives and expects to invest in a wide variety of financial instruments. These instruments include global convertible, exchangeable instruments, as well as “synthetic” convertible instruments. The Fund will also invest in global equities or equity-linked securities with high income potential. From time to time, the Fund expects to invest in Rule 144A securities, foreign exchange contracts or securities with imbedded foreign exchange hedges, and high yield bonds of companies rated BB or lower.

In general, the Fund intends to seek out companies with a long-term track record of high dividend payout consistent with dividend growth. In certain circumstances, the Fund may invest in underlying companies it believes have substantial prospects for price appreciation even if the there is little or no dividend growth potential. The Fund may from time to time, seek to sell index options or single stock options (either listed or “over the counter”) to enhance the overall yield of the Fund or, in the opinion of the Adviser, reduce portfolio volatility. The Fund may purchase options to hedge or engage in other hedging activities including the purchase or sale of futures, swaps or options on equities, indices, currencies, interest rates or credits.

The Fund may seek to generate income from option premiums by writing (selling) options. The Fund may write (sell) call options (i) o n a portion of the equity securities in the Fund’s portfolio and (ii) on broad-based securities indices or certain ETFs (exchange traded funds) that trade like common stocks but seek to replicate such market indices.

The Fund currently uses financial leverage. The Fund has obtained financial leverage (i) under an Amended and Restated Liquidity Agreement with State Street Bank and Trust Company (“SSB Agreement”) that allows the Fund to borrow up to $265 million and (ii) through the issuance of three series of Mandatory Redeemable Preferred Shares (“MRPS” or “MRP Shares”) with an aggregate liquidation preference of $65 million.

Principal Risks

Management Risk. Calamos’ judgment about the attractiveness, relative value or potential appreciation of a particular sector, security or investment strategy may prove to be incorrect.

Portfolio Selection Risk. The value of your investment may decrease if the investment adviser’s judgment about the attractiveness, value or market trends affecting a particular security, issuer, industry or sector or about market movements is incorrect.

Equity Securities Risk. Equity investments are subject to greater fluctuations in market value than other asset classes as a result of such factors as the issuer’s business performance, investor perceptions, stock market trends and general economic conditions. Equity securities are subordinated to bonds and other debt instruments in a company’s capital structure in terms of priority to corporate income and liquidation payments. The Fund may invest in preferred stocks and convertible securities of any rating, including below investment grade.

​

Calamos Global Dynamic Income Fund (CHW) (unaudited)

CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 11

Below investment grade securities or comparable unrated securities are considered predominantly speculative with respect to the issuer’s ability to pay interest and principal and are susceptible to default or decline in market value due to adverse economic and business developments. The market values for below investment grade securities tend to be very volatile, and these securities are generally less liquid than investment- grade debt securities. For these reasons, your investment in the Fund is subject to the following specific risks:

•increased price sensitivity to changing interest rates and to a deteriorating economic environment;

•greater risk of loss due to default or declining credit quality;

•adverse company specific events are more likely to render the issuer unable to make interest and/or principal payments; and

•if a negative perception of the below investment grade market develops, the price and liquidity of below investment grade securities may be depressed. This negative perception could last for a significant period of time.

Emerging Markets Risk. Emerging market countries may have relatively unstable governments and economies based on only a few industries, which may cause greater instability. The value of emerging market securities will likely be particularly sensitive to changes in the economies of such countries. These countries are also more likely to experience higher levels of inflation, deflation or currency devaluations, which could adversely affect the value of the Fund’s investments and hurt those countries’ economies and securities markets.

Foreign Securities Risk. Investments in non-U.S. issuers may involve unique risks compared to investing in securities of U.S. issuers. These risks are more pronounced to the extent that the Fund invests a significant portion of its non-U.S. investments in one region or in the securities of emerging market issuers. These risks may include:

•less information may be available about non-U.S. issuers or markets due to less rigorous disclosure or accounting standards or regulatory practices in foreign jurisdictions;

•many non-U.S. markets are smaller, less liquid and more volatile. In a changing market, Calamos may not be able to sell the Fund’s portfolio securities at times, in amounts and at prices it considers reasonable;

•an adverse effect of currency exchange rate changes or controls on the value of the Fund’s investments;

•the economies of non-U.S. countries may grow at slower rates than expected or may experience a downturn or recession;

•economic, political and social developments may adversely affect the securities markets in foreign jurisdictions, including expropriation and nationalization;

•the difficulty in obtaining or enforcing a court judgment in non-U.S. countries;

•restrictions on foreign investments in non-U.S. jurisdictions;

•difficulties in effecting the repatriation of capital invested in non-U.S. countries;

•withholding and other non-U.S. taxes may decrease the Fund’s return; and

•dividend income the Fund receives from foreign securities may not be eligible for the special tax treatment applicable to qualified dividend income.

Based upon the Fund’s test for determining whether an issuer is a “foreign issuer” as described above, it is possible that an issuer of securities in wh ich the Fund invests could be organized under the laws of a foreign country, yet still conduct a substantial portion of its business in the U.S. or have substantial assets in the U.S. In this case, such a “foreign issuer” may be subject to the market conditions in the U.S. to a greater extent than it may be subject to the market conditions in the country of its organization.

Debt Securities Risk. The Fund may invest in debt securities, including corporate bonds and high yield securities. In addition to the risks described elsewhere in the Fund's prospectus (such as high yield securities risk and interest rate risk), debt securities are subject to certain additional risks, including issuer risk and reinvestment risk. Issuer risk is the risk that the value of debt securities may decline for a number of reasons which directly relate to the issuer, such as management performance, leverage and reduced demand for the issuer’s goods and services. Reinvestment risk is the risk that income from the Fund’s portfolio will decline if the Fund invests the proceeds from matured, traded or called bonds at market interest rates that are below the Fund portfolio’s current earnings rate. A decline in income could affect the market price of the Fund’s common shares or the overall return of the Fund.

​

Calamos Global Dynamic Income Fund (CHW) (unaudited)

12 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT

Convertible Securities Risk. The value of a convertible security is influenced by both the yield of non- convertible securities of comparable issuers and by the value of the underlying common stock. The value of a convertible security viewed without regard to its conversion feature (i.e., strictly on the basis of its yield) is sometimes referred to as its “investment value.” A convertible security’s investment value tends to decline as prevailing interest rate levels increase. Conversely, a convertible security’s investment value tends to increase as prevailing interest rate levels decline.

However, a convertible security’s market value tends to reflect the market price of the common stock of the issuing company when that stock price is greater than the convertible security’s “conversion price.” The conversion price is defined as the predetermined price at which the convertible security could be exchanged for the associated stock. As the market price of the underlying common stock declines, the price of the convertible security tends to be influenced more by the yield of the convertible security and changes in interest rates. Thus, the convertible security may not decline in price to the same extent as the underlying common stock. In the event of a liquidation of the issuing company, holders of convertible securities would be paid before the company’s common stockholders.

Non-Convertible Income Securities Risk. The Fund will also invest in non-convertible income securities. The Fund’s investments in non-convertible income securities may have fixed or variable principal payments and all types of interest rate and dividend payment and reset terms, including fixed rate, adjustable rate, zero coupon, contingent, deferred, payment in kind and auction rate features. Recent events in the fixed-income markets, including the potential impact of the Federal Reserve Board tapering its quantitative easing program, may expose the Fund to heightened interest rate risk and volatility as a result of a rise in interest rates. In addition, the Fund is subject to the risk that interest rates may exhibit increased volatility, which could cause the Fund’s net asset value (“NAV”) to fluctuate more. A decrease in fixed-income market maker capacity may act to decrease liquidity in the fixed-income markets and act to further increase volatility, affecting the Fund’s return.

Derivatives Risk. Generally, derivatives are financial contracts whose value depends on, or is derived from, the value of an underlying asset, reference rate or index, and may relate to individual debt or equity instruments, interest rates, currencies or currency exchange rates, commodities, related indices and other assets. The Fund may utilize a variety of derivative instruments including, but not limited to, interest rate swaps, convertible securities, synthetic convertible instruments, options on individual securities, index options, long calls, covered calls, long puts, cash-secured short puts and protective puts for hedging, risk management and investment purposes.

The Fund’s use of derivative instruments involves investment risks and transaction costs to which the Fund would not be subject absent the use of these instruments and, accordingly, may result in losses greater than if they had not been used. The use of derivative instruments may have risks including, among others, leverage risk, volatility risk, duration mismatch risk, correlation risk, liquidity risk, interest rate risk, credit risk, management risk and counterparty risk. Derivatives also involve the risk of mispricing or improper valuation and the risk that changes in the value of a derivative may not correlate perfectly with an underlying asset, interest rate or index. Suitable derivative transactions may not be available in all circumstances and there can be no assurance that the Fund will engage in these transactions to reduce exposure to other risks when that would be beneficial.

Furthermore, the skills needed to employ derivatives strategies are different from those needed to select portfolio securities and, in connection with such strategies, the Fund makes predictions with respect to market conditions, liquidity, currency movements, market values, interest rates and other applicable factors, which may be inaccurate. Thus, the use of derivative investments may require the Fund to sell or purchase portfolio securities at inopportune times or for prices below or above the current market values, may limit the amount of appreciation the Fund can realize on an investment or may cause the Fund to hold a security that it might otherwise want to sell. Tax rules governing the Fund’s transactions in derivative instruments may also affect whether gains and losses recognized by the Fund are treated as ordinary or capital, accelerate the recognition of income or gains to the Fund, defer losses to the Fund, and cause adjustments in the holding periods of the Fund’s securities, thereby affecting, among other things, whether capital gains and losses are treated as short-term or long-term. These rules could therefore affect the amount, timing and/or character of distributions to shareholders. In addition, there may be situations in which the Fund elects not to use derivative investments that result in losses greater than if they had been used.

Amounts paid by the Fund as premiums and cash or other assets held in margin accounts with respect to the Fund’s derivative instruments would not be available to the Fund for other investment purposes, which may result in lost opportunities for gain.

Derivative instruments can be illiquid, may disproportionately increase losses and may have a potentially large impact on Fund performance.

​

Calamos Global Dynamic Income Fund (CHW) (unaudited)

CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 13

Risks Associated with Options. There are several risks associated with transactions in options. For example, there are significant differences between the securities markets and options markets that could result in an imperfect correlation among these markets, causing a given transaction not to achieve its objectives. A decision as to whether, when and how to use options involves the exercise of skill and judgment, and even a well- conceived transaction may be unsuccessful to some degree because of market behavior or unexpected events. The Fund’s ability to utilize options successfully will depend on Calamos’ ability to predict pertinent market movements, which cannot be assured.

The Fund may sell options on individual securities and securities indices. All call options sold by the Fund must be “covered.” Even though the Fund will receive the option premium to help protect it against loss, a call option sold by the Fund exposes the Fund during the term of the option to possible loss of opportunity to realize appreciation in the market price of the underlying security or instrument and may require the Fund to hold a security or instrument that it might otherwise have sold. In addition, a loss on a call option sold may be greater than the premium received. The Fund may purchase and sell put options on individual securities and securities indices. In selling put options, there is a risk that the Fund may be required to buy the underlying security at a disadvantageous price above the market price. The Fund may purchase and sell put options on individual securities and securities indices. In selling put options, there is a risk that the Fund may be required to buy the underlying security at a disadvantageous price above the market price.

Currency Risk. To the extent that the Fund invests in securities or other instruments denominated in or indexed to foreign currencies, changes in currency exchange rates bring an added dimension of risk. Currency fluctuations could negatively impact investment gains or add to investment losses. Although the Fund may attempt to hedge against currency risk, the hedging instruments may not always perform as the Fund expects and could produce losses. Suitable hedging instruments may not be available for currencies of emerging market countries. The Fund’s investment adviser may determine not to hedge currency risks, even if suitable instruments appear to b e avail able.

Credit Risk. An issuer of a fixed income security could be downgraded or default. If the Fund holds securities that have been downgraded, or that default on payment, the Fund’s performance could be negatively affected.

Default Risk. Default risk refers to the risk that a company that issues a convertible or debt security will be unable to fulfill its obligations to repay principal and interest. The lower a debt security is rated, the greater its default risk. The Fund may incur cost and delays in enforcing its rights against the defaulting issuer.

Recent Market Events. In the past decade, financial markets throughout the world have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty and turmoil. This turmoil resulted in unusual and extreme volatility in the equity and debt markets, in the prices of individual securities and in the world economy. Events that have contributed to these market conditions include, but are not limited to, major cybersecurity events, geopolitical events (including wars, terror attacks and public health emergencies), measures to address budget deficits, downgrading of sovereign debt, declines in oil and commodity prices, dramatic changes in currency exchange rates, and public sentiment. In addition, many governments and quasi-governmental entities throughout the world have responded to the turmoil with a variety of significant fiscal and monetary policy changes, including, but not limited to, direct capital infusions into companies, new monetary programs and dramatically lower interest rates.

The recent spread of an infectious respiratory illness caused by a novel strain of coronavirus (“COVID-19”) has caused volatility, severe market dislocations and liquidity constraints in many markets, including markets for the securities the Fund holds, and may adversely affect the Fund's investments and operations. The transmission of this coronavirus and efforts to contain its spread have resulted in travel restrictions and disruptions, closed international borders, enhanced health screenings at ports of entry and elsewhere, disruption of and delays in healthcare service preparation and delivery, quarantines, event and service cancellations or interruptions, disruptions to business operations (including staff furloughs and reductions) and supply chains, and a reduction in consumer and business spending, as well as general concern and uncertainty that has negatively affected the economy. These disruptions have led to instability in the market place, including equity and debt market losses and overall volatility, and the jobs market. The impact of this coronavirus, and other epidemics and pandemics that may arise in the future, could affect the economies of many nations, individual companies and the market in general in ways that cannot necessarily be foreseen at the present time. In addition, the impact of infectious diseases in developing or emerging market countries may be greater due to less established health care systems. Health crises caused by the recent coronavirus outbreak may exacerbate other pre-existing political, social and economic risks in certain countries. The impact of the outbreak may be short term or may last for an extended period of time.

​

Calamos Global Dynamic Income Fund (CHW) (unaudited)

14 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT

While the extreme volatility and disruption that U.S. and global markets experienced for an extended period of time beginning in 2007 and 2008 had, until the recent coronavirus outbreak, generally subsided, uncertainty and periods of volatility still remained, and risks to a robust resumption of growth persisted. Federal Reserve policy, including with respect to certain interest rates may adversely affect the value, volatility and liquidity of dividend and interest paying securities. Market volatility, dramatic changes to interest rates and/or a return to unfavorable economic conditions may lower the Fund’s performance or impair the Fund’s ability to achieve its inve stment obje ctive.

In June 2016, the United Kingdom approved a referendum to leave the European Union (“EU”) (“Brexit”). On March 29, 2017, the United Kingdom formally notified the European Council of its intention to leave the EU and commenced the formal process of withdrawing from the EU. The withdrawal agreement entered into between the United Kingdom and the EU entered into force on January 31, 2020, at which time the United Kingdom ceased to be a member of the EU. Following the withdrawal, there will be an eleven-month transition period, ending December 31, 2020, during which the United Kingdom will negotiate its future relationship with the EU. Brexit has resulted in volatility in European and global markets and could have negative long-term impacts on financial markets in the United Kingdom and throughout Europe. There is considerable uncertainty about the potential consequences for Brexit, how it will be conducted, how negotiations of trade agreements will proceed, and how the financial markets will react, and as this process unfolds, markets may be further disrupted. Given the size and importance of the United Kingdom’s economy, uncertainty about its legal, political, and economic relationship with the remaining member states of the EU may continue to be a source of instability. Moreover, other countries may seek to withdraw from the European Union and/or abandon the euro, the common currency of the EU.

A number of countries in Europe have suffered terror attacks, and additional attacks may occur in the future. Ukraine has experienced ongoing military conflict; this conflict may expand and military attacks could occur elsewhere in Europe. Europe has also been struggling with mass migration from the Middle East and Africa. The ultimate effects of these events and other socio-political or geographical issues are not known but could profoundly affect global economies and markets.

As a result of political and military actions undertaken by Russia, the U.S. and the EU have instituted sanctions against certain Russian officials and companies. These sanctions and any additional sanctions or other intergovernmental actions that may be undertaken against Russia in the future may result in the devaluation of Russian currency, a downgrade in the country’s credit rating, and a decline in the value and liquidity of Russian securities. Such actions could result in a freeze of Russian securities, impairing the ability of a fund to buy, sell, receive, or deliver those securities. Retaliatory action by the Russian government could involve the seizure of US and/or European residents’ assets, and any such actions are likely to impair the value and liquidity of such assets.

Any or all of these potential results could have an adverse/recessionary effect on Russia’s economy. All of these factors could have a negative effect on the performance of funds that have significant exposure to Russia. In addition, policy and legislative changes in the United States and in other countries are changing many aspects of financial regulation. The impact of these changes on the markets, and the practical implications for market participants, may not be fully known for some time. Widespread disease and virus epidemics, such as the recent coronavirus outbreak, could likewise be highly disruptive, adversely affecting individual companies, sectors, industries, markets, currencies, interest and inflation rates, credit ratings, investor sentiment, and other factors affecting the value of the Fund’s investments.

Market Disruption Risk. Certain events have a disruptive effect on the securities markets, such as terrorist attacks, war and other geopolitical events, earthquakes, storms and other disasters. The Fund cannot predict the effects of similar events in the future on the U.S. economy or any foreign economy.

Market Discount Risk. The Fund’s common shares may trade at a premium or at a discount in relation to NAV. Shares of closed-end investment companies frequently trade at a discount from NAV, but in some cases trade above NAV. The risk of the common shares trading at a discount is a risk separate from the risk of a decline in the Fund’s NAV as a result of investment activities. The Fund’s NAV may be reduced immediately following this offering by the offering costs for common shares or other securities, which will be borne entirely by all common shareholders. The Fund’s common shares are designed primarily for long-term investors, and you should not purchase common shares if you intend to sell them shortly after purchase.

Whether shareholders will realize a gain or loss upon the sale of the Fund’s common shares depends upon whether the market value of the shares at the time of sale is above or below the price the shareholder paid, taking into account transaction costs for the shares, and is not directly dependent upon the Fund’s NAV. Because the market value of the Fund’s common shares will be determined by factors such as the relative demand for and supply of the shares in the market, general market conditions and other factors beyond the control of the Fund, the Fund cannot predict whether its common shares will trade at, below or above NAV, or below or above the public offering price for the common shares.

​

Calamos Global Dynamic Income Fund (CHW) (unaudited)

CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 15

Leverage Risk. The Fund has issued indebtedness and preferred shares and may borrow money or issue debt securities as permitted by the 1940 Act. As of October 31, 2020, the Fund has leverage in the form of borrowings under the SSB Agreement and outstanding MRP Shares. Leverage is the potential for the Fund to participate in gains and losses on an amount that exceeds the Fund’s investment. The borrowing of money or issuance of debt securities and preferred shares represents the leveraging of the Fund’s common shares. As a non-fundamental policy, the Fund may not issue preferred shares or borrow money and/or issue debt securities with an aggregate liquidation preference and aggregate principal amount exceeding 38% of the Fund’s managed assets as measured at the time of borrowing or issuance of the new securities. However, the Board of Trustees reserves the right to issue preferred shares or debt securities or borrow to the extent permitted by the 1940 Act and the Fund’s policies.

Leverage creates risks which may adversely affect the return for the holders of common shares, including:

•the likelihood of greater volatility in the NAV and market price of the Fund’s common shares;

•fluctuations in the dividend rates on any preferred shares borne by the Fund or in interest rates on borrowings and short-term debt;

•increased operating costs, which are effectively borne by common shareholders, may reduce the Fund’s total return; and

•the potential for a decline in the value of an investment acquired with borrowed funds, while the Fund’s obligations under such borrowing or preferred shares remain fixed.

In addition, the rights of lenders and the holders of preferred shares and debt securities issued by the Fund will be senior to the rights of the holders of common shares with respect to the payment of dividends or to the payment of assets upon liquidation. Holders of preferred shares have voting rights in addition to and separate from the voting rights of common shareholders. The holders of preferred shares or debt, if any, on the one hand, and the holders of the common shares, on the other, may have interests that conflict in certain situations.

Leverage is a speculative technique that could adversely affect the returns to common shareholders. Leverage can cause the Fund to lose money and can magnify the effect of any losses. To the extent the income or capital appreciation derived from securities purchased with funds received from leverage exceeds the cost of leverage, the Fund’s return will be greater than if leverage had not been used. Conversely, if the income or capital appreciation from the securities purchased with such funds is not sufficient to cover the cost of leverage or if the Fund incurs capital losses, the return of the Fund will be less than if leverage had not been used, and therefore the amount available for distribution to common shareholders as dividends and other distributions will be reduced or potentially eliminated.

The Fund will pay, and common shareholders will effectively bear, any costs and expenses relating to any borrowings and to the issuance and ongoing maintenance of preferred shares or debt securities. Such costs and expenses include the higher management fee resulting from the use of any such leverage, offering and/or issuance costs, and interest and/or dividend expense and ongoing maintenance. These conditions may, directly or indirectly, result in higher leverage costs to common shareholders.

Certain types of borrowings may result in the Fund being subject to covenants in credit agreements, including those relating to asset coverage, borrowing base and portfolio composition requirements and additional covenants that may affect the Fund’s ability to pay dividends and distributions on common shares in certain instances. The Fund may also be required to pledge its assets to the lenders in connection with certain types of borrowings. The Fund may be subject to certain restrictions on investments imposed by guidelines of and covenants with rating agencies which may issue ratings for the preferred shares or short-term debt instruments issued by the Fund. These guidelines and covenants may impose asset coverage or portfolio composition requirements that are more stringent than those imposed by the 1940 Act. The Board of Trustees reserves the right to change the amount and type of leverage that the Fund uses, and reserves the right to implement changes to the Fund’s borrowings that it believes are in the long-term interests of the Fund and its shareholders, even if such changes impose a higher interest rate or other costs or impacts over the intermediate, or short-term time period. There is no guarantee that the Fund will maintain leverage at the current rate, and the Board of Trustees reserves the right to raise, decrease, or eliminate the Fund’s leverage exposure.

If the Fund’s ability to make dividends and distributions on its common shares is limited, such limitation could, under certain circumstances, impair the ability of the Fund to maintain its qualification for taxation as a regulated investment company or to reduce or eliminate tax at the Fund level, which would have adver se tax consequences for common shareholders. To the extent that

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Calamos Global Dynamic Income Fund (CHW) (unaudited)

16 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT

the Fund is required, in connection with maintaining 1940 Act asset coverage requirements or otherwise, or elects to redeem any senior securities or prepay any borrowings, the Fund may need to liquidate investments to fund such redemptions or prepayments. Liquidation at times of adverse economic conditions may result in capital loss and reduce returns to common shareholders.

Because Calamos’ investment management fee is a percentage of the Fund’s managed assets, Calamos’ fee will be higher if the Fund is leveraged and Calamos will have an incentive to be more aggressive and leverage the Fund. Consequently, the Fund and Calamos may have differing interests in determining whether to leverage the Fund’s assets. Any additional use of leverage by the Fund would require approval by the Board. In considering whether to approve the use of additional leverage, the Board would be presented with all relevant information necessary to make a determination whether or not additional leverage would be in the best interests of the Fund, including information regarding any potential conflicts of interest.

In considering whether to approve the use of additional leverage through those means, the Board would be presented with all relevant information necessary to make a determination whether or not additional leverage would be in the best interests of the Fund, including information regarding any potential conflicts of interest.

Effects of Leverage. The SSB Agreement provides for credit availability for the Fund, such that it may borrow up to $265.0 million. As of October 31, 2020, the Fund had utilized $153.3 million of the $265.0 million available under the SSB Agreement ($68.1 million in borrowings outstanding, and $85.2 million in structural leverage consisting of collateral received from State Street Bank and Trust Company in connection with securities on loan). Interest on the SSB Agreement is charged on the drawn amount at the rate of Overnight LIBOR plus 0.80%, payable monthly in arrears. Interest on overdue amounts or interest on the drawn amount paid during an event of default will be charged at Overnight LIBOR plus 2.80%. These rates represent floating rates of interest that may change over time. The SSB Agreement has a commitment fee of 0.10% of any undrawn amount. As of October 31, 2020, the interest rate charged under the SSB Agreement was 0.88%. “Net income” payments related to cash collateral in connection with securities lending were 0.44% of the borrowed amount on an annualized basis as of that date, although this amount can vary based on changes in underlying interest rates.

The Fund’s MRP Shareholders are entitled to receive monthly cash dividends, at a currently effective dividend rate per annum for each series of MRP Shares as follows (subject to adjustment as described in the Fund's prospectus: 3.70% for Series A MRP Shares, 4.00% for Series B MRP Shares and 4.24% for Series C MRP Shares.

To cover the interest expense on the borrowings under the SSB Agreement (including “net income” payments made with respect to borrowings offset by collateral for securities on loan) and the dividend payments associated with the MRP Shares, based on rates in effect on October 31, 2020, the Fund’s portfolio would need to experience an annual return of 0.69% (before giving effect to expenses associated with senior securities).

Leverage is a speculative technique that could adversely affect the returns to common shareholders. Leverage can cause the Fund to lose money and can magnify the effect of any losses. To the extent the income or capital appreciation derived from securities purchased with funds received from leverage exceeds the cost of leverage, the Fund’s return will be greater than if leverage had not been used. Conversely, if the income or capital appreciation from the securities purchased with such funds is not sufficient to cover the cost of leverage or if the Fund incurs capital losses, the return of the Fund will be less than if leverage had not been used, and therefore the amount available for distribution to common shareholders as dividends and other distributions will be reduced or potentially eliminated.

The Fund will pay, and common shareholders will effectively bear, any costs and expenses relating to any borrowings and to the issuance and ongoing maintenance of preferred shares, including the MRP Shares, or debt securities. Such costs and expenses include the higher management fee resulting from the use of any such leverage, offering and/or issuance costs, and interest and/or dividend expense and ongoing maintenance.

Certain types of borrowings may result in the Fund being subject to covenants in credit agreements, including those relating to asset coverage, borrowing base and portfolio composition requirements and additional covenants that may affect the Fund’s ability to pay dividends and distributions on common shares in certain instances. The Fund may also be required to pledge its assets to the lenders in connection with certain types of borrowings. The Fund may be subject to certain restrictions on investments imposed by guidelines of and covenants with rating agencies for the preferred shares or short-term debt instruments issued by the Fund. These guidelines and covenants may impose asset coverage or portfolio composition requirements that are more stringent than those imposed by the 1940 Act.

​

Calamos Global Dynamic Income Fund (CHW) (unaudited)

CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 17

The following table illustrates the hypothetical effect on the return to a holder of the Fund’s common shares of the leverage obtained by us (and utilized on October 31, 2020). The purpose of this table is to assist you in understanding the effects of leverage. As the table shows, leverage generally increases the return to common shareholders when portfolio return is positive and greater than the cost of leverage and decreases the return when the portfolio return is negative or less than the cost of leverage. The figures appearing in the table are hypothetical and actual returns may be greater or less than those appearing in the table.

Assumed Portfolio Return (Net of Expenses) | ​ | (10.00 | )% | (5.00 | )% | 0.00 | % | 5.00 | % | 10.00 | %
Corresponding Common Share Return(1) | ​ | (15.60 | )% | (8.30 | )% | (1.00 | )% | 6.30 | % | 13.60 | %

(1)Includes interest expense on the borrowings under the SSB Agreement, accrued at the interest rate in effect on October 31, 2020 of 0.88%, and dividend expense on the MRP Shares.

Reduction of Leverage Risk. The Fund has previously taken, and may in the future take, action to reduce the amount of leverage it employs. Reduction of the leverage employed by the Fund, including by redemption of preferred shares, will in turn reduce the amount of assets available for investment in portfolio securities. This reduction in leverage may negatively impact our financial performance, including our ability to sustain current levels of distributions on common shares.

The Board reserves the right to change the amount and type of leverage that the Fund uses, and reserves the right to implement changes to the Fund’s borrowings that it believes are in the best long-term interests of the Fund, even if such changes impose a higher interest rate or other costs or impacts over the intermediate, or short-term time period. There is no guarantee that the Fund will maintain leverage at the current rate, and the Board reserves the right to raise, decrease, or eliminate the Fund’s leverage exposure.

Interest Rate Risk. In addition to the risks discussed above, debt securities, including high yield securities, are subject to certain risks, including:

•if interest rates go up, the value of debt securities in the Fund’s portfolio generally will decline;

•during periods of declining interest rates, the issuer of a security may exercise its option to prepay principal earlier than scheduled, forcing the Fund to reinvest in lower yielding securities. This is known as call or prepayment risk. Debt securities frequently have call features that allow the issuer to repurchase the security prior to its stated maturity. An issuer may redeem an obli gation if the issuer can refinance the debt at a lower cost due to declining interest rates or an improvement in the credit standing of the issuer;

•during periods of rising interest rates, the average life of certain types of securities may be extended because of slower than expected principal payments. This may lock in a below market interest rate, increase the estimated period until the security is paid in full and reduce the value of the security. This is known as extension risk;

•rising interest rates could result in an increase in the cost of the Fund’s leverage and could adversely affect the ability of the Fund to meet asset coverage requirements with respect to leverage;

•variable rate securities generally are less sensitive to interest rate changes but may decline in value if their interest rates do not rise as much, or as quickly, as interest rates in general. When the Fund holds variable rate securities, a decrease in market interest rates will adversely affect the income received from such securities and the NAV of the Fund’s shares; and

•the risks associated with rising interest rates may be particularly acute in the current market environment because market interest rates are currently near historically low levels. Thus, the Fund currently faces a heightened level of interest rate risk, especially since the Federal Reserve Board has ended its quantitative easing program and has begun, and may continue, to raise interest rates. To the extent the Federal Reserve Board continues to raise interest rates, there is a risk that interest rates across the financial system may rise. Increases in volatility and interest rates in the fixed-income market may expose the Fund to heightened interest rate risk.

Many financial instruments use or may use a floating rate based on LIBOR, which is the offered rate for short-term Eurodollar deposits between major international banks. On July 27, 2017, the head of the United Kingdom’s Financial Conduct Authority announced a desire to phase out the use of LIBOR by the end of 2021. On November 30, 2020, the administrator of LIBOR announced a delay in the phase out of a majority of the U.S. dollar LIBOR publications until June 30, 2023, with the remainder of LIBOR publications to still end at the end of 2021.

​

Calamos Global Dynamic Income Fund (CHW) (unaudited)

18 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT

There remains uncertainty regarding the future utilization of LIBOR and the nature of any replacement rate. As such, the potential effect of a transition away from LIBOR on the Fund or the financial instruments in which the Fund invests cannot yet be determined.

High Yield Securities Risk. The Fund may invest in high yield securities of any rating. Investment in high yield securities involves substantial risk of loss. Below investment grade non-convertible debt securities or comparable unrated securities are commonly referred to as “junk bonds” and are considered predominantly speculative with respect to the issuer’s ability to pay interest and principal and are susceptible to default or decline in market value due to adverse economic and business developments. The market values for high yield securities tend to be very volatile, and these securities are less liquid than investment grade debt securities. For these reasons, your investment in the Fund is subject to the following specific risks:

•increased price sensitivity to changing interest rates and to a deteriorating economic environment;

•greater risk of loss due to default or declining credit quality;

•adverse company specific events are more likely to render the issuer unable to make interest and/or principal payments; and

•if a negative perception of the high yield market develops, the price and liquidity of high yield securities may be depressed. This negative perception could last for a significant period of time.

Adverse changes in economic conditions are more likely to lead to a weakened capacity of a high yield issuer to make principal payments and interest payments than an investment grade issuer. The principal amount of high yield securities outstanding has proliferated since the inception of the Fund as an increasing number of issuers have used high yield securities for corporate financing. An economic downturn could severely affect the ability of highly leveraged issuers to service their debt obligations or to repay their obligations upon maturity. The Fund may incur additional expenses to the extent it is required to seek recovery upon a default in payment of principal or interest on its portfolio holdings. In certain circumstances, the Fund may be required to foreclose on an issuer’s assets and take possession of its property or operations. In such circumstances, the Fund would incur additional costs in disposing of such assets and potential liabilities from operating any business acquired.

The secondary market for high yield securities may not be as liquid as the secondary market for more highly rated securities, a factor which may have an adverse effect on the Fund’s ability to dispose of a particular security. There are fewer dealers in the market for high yield securities than for investment grade obligations. The prices quoted by different dealers may vary significantly and the spread between the bid and asked price is generally much larger than for higher quality instruments. Under adverse market or economic conditions, the secondary market for securities could contract further, independent of any specific adverse changes in the condition of a particular issuer, and these instruments may become illiquid. As a result, the Fund could find it more difficult to sell these securities or may be able to sell the securities only at prices lower than if such securities were widely traded. Prices realized upon the sale of such lower rated or unrated securities, under these circumstances, may be less than the prices used in calculating the Fund’s net asset value.

Synthetic Convertible Instruments Risk. The value of a synthetic convertible instrument may respond differently to market fluctuations than a convertible instrument because a synthetic convertible instrument is composed of two or more separate securities, each with its own market value. In addition, if the value of the underlying common stock or the level of the index involved in the convertible component falls below the exercise price of the warrant or option, the warrant or option may lose all value.

Geographic Concentration Risk. Investments in a particular country or geographic region may be particularly susceptible to political, diplomatic or economic conditions and regulatory requirements. To the extent the Fund concentrates its investments in a particular country, region or group of regions, the Fund may be more volatile than a more geographically diversified fund.

Sector Risk. To the extent the Fund invests a significant portion of its assets in a particular sector, a greater portion of the Fund’s performance may be affected by the general business and economic conditions affecting that sector. Each sector may share economic risk with the broader market, however there may be economic risks specific to each sector. As a result, returns from those sectors may trail returns from the overall stock market and it is possible that the Fund may underperform the broader market, or experience greater volatility.

American Depositary Receipts Risk. The stocks of most foreign companies that trade in the U.S. markets are traded as ADRs. U.S. depositary banks issue these stocks. Each ADR represents one or more shares of foreign stock or a fraction of a share. The price of an ADR corresponds to the price of the foreign stock in its home market, adjusted to the ratio of the ADRs to foreign company shares. Therefore while purchasing a security on a U.S. exchange, the risks inherently associated with foreign investing still apply to ADRs.

​

Calamos Global Dynamic Income Fund (CHW) (unaudited)

CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 19

Duration Risk. Duration measures the time-weighted expected cash flows of a fixed-income security, which can determine its sensitivity to changes in the general level of interest rates. The value of securities with longer durations tend to be more sensitive to interest rate changes than securities with shorter durations. The longer the Fund’s dollar-weighted average duration, the more its value can generally be expected to be sensitive to interest rate changes than a fund with a shorter dollar-weighted average duration. Duration differs from maturity in that it considers a security’s coupon payments in addition to the amount of time until the security matures. Various techniques may be used to shorten or lengthen the Fund’s duration. As the value of a security changes over time, so will its duration.

Inflation Risk. Inflation is the reduction in the purchasing power of money resulting from an increase in the price of goods and services. Inflation risk is the risk that the inflation adjusted or “real” value of an investment in preferred stock or debt securities or the income from that investment will be worth less in the future. As inflation occurs, the real value of the preferred stock or debt securities and the dividend payable to holders of preferred stock or interest payable to holders of debt securities declines.

Maturity Risk. Interest rate risk will generally affect the price of a fixed income security more if the security has a longer maturity. Fixed income securities with longer maturities will therefore be more volatile than other fixed income securities with shorter maturities. Conversely, fixed income securities with shorter maturities will be less volatile but generally provide lower potential returns than fixed income securities with longer maturities. The average maturity of the Fund’s investments will affect the volatility of the Fund’s sha re pr ice.

Liquidity Risk. The Fund may invest without limit in securities that, at the time of investment, are illiquid (i.e., any investment that the Fund reasonably expects cannot be sold or disposed of in current market conditions in seven calendar days or less without the sale or disposition significantly changing the market value of the investment). The Fund may also invest without limit in Rule 144A Securities determined to be liquid. Calamos, under the supervision and oversight of the Board of Trustees, will determine whether Rule 144A Securities are illiquid (that is, not readily marketable). Illiquid securities may be difficult to dispose of at a fair price at the times when the Fund believes it is desirable to do so. Investment of the Fund’s assets in illiquid securities may restrict the Fund’s ability to take advantage of market opportunities. The market price of illiquid securities generally is more volatile than that of more liquid securities, which may adversely affect the price that the Fund pays for or recovers upon the sale of illiquid securities. Illiquid securities are also more difficult to value and may be fair valued by the Board of Trustees, in which case Calamos’ judgment may play a greater role in the valuation process. The risks associated with illiquid securities may be particularly acute in situations in which the Fund’s operations require cash and could result in the Fund borrowing to meet its short-term needs or incurring losses on the sale of illiquid securities.

Decline in Net Asset Value Risk. A material decline in our NAV may impair our ability to maintain required levels of asset coverage for any preferred securities or debt securities the Fund may issue in the future.

Counterparty and Settlement Risk. Trading options, futures contracts, swaps and other derivative financial instruments entails credit risk with respect to the counterparties. Such instruments when traded over the counter do not include the same protections as may apply to trading derivatives on organized exchanges. Substantial losses may arise from the insolvency, bankruptcy or default of a counterparty and risk of settlement default of parties with whom it trades securities. This risk may be heightened during volatile market conditions. Settlement mechanisms in emerging markets are generally less developed and reliable than those in more developed countries, thus increasing the risks. In the past, broker-dealers and other financial institutions have experienced extreme financial difficulty, sometimes resulting in bankruptcy of the institution. Although Calamos monitors the creditworthiness of the Fund’s counterparties, there can be no assurance that the Fund’s counterparties will not experience similar difficulties, possibly resulting in losses to the Fund. If a counterparty becomes bankrupt, or otherwise fails to perform its obligations under a derivative contract due to financial difficulties, the Fund may experience significant delays in obtaining any recovery under the derivative contract in a bankruptcy or other reorganization proceeding. The Fund may obtain only a limited recovery or may obtain no recovery in such circumstances. Material exposure to a single or small group of counterparties increases the Fund’s counterparty risk.

Portfolio Turnover Risk. The portfolio managers may actively and frequently trade securities or other instruments in the Fund’s portfolio to carry out its investment strategies. A high portfolio turnover rate increases transaction costs, which may increase the Fund’s expenses. Frequent and active trading may also cause adverse tax consequences for investors in the Fund due to an increase in short-term capital gains.

REIT Risk. Investing in real estate investment trusts (“REITs”) involves certain unique risks in addition to those risks associated with investing in the real estate industry in general. An equity REIT may be affected by changes in the value of the underlying properties owned by the REIT. A mortgage REIT may be affected by changes in interest rates and the ability of the issuers of its portfolio

​

Calamos Global Dynamic Income Fund (CHW) (unaudited)

20 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT

mortgages to repay their obligations. REITs are dependent upon the skills of their managers and are not diversified. REITs are generally dependent upon maintaining cash flows to repay borrowings and to make distributions to shareholders and are subject to the risk of default by lessees or borrowers. REITs whose underlying assets are concentrated in properties used by a particular industry, such as health care, are also subject to risks associated with such industry.

REITs (especially mortgage REITs) are also subject to interest rate risks. When interest rates decline, the value of a REIT’s investment in fixed rate obligations can be expected to rise. Conversely, when interest rates rise, the value of a REIT’s investment in fixed rate obligations can be expected to decline. If the REIT invests in adjustable rate mortgage loans the interest rates on which are reset periodically, yields on a REIT’s investments in such loans will gradually align themselves to reflect changes in market interest rates. This causes the value of such investments to fluctuate less dramatically in response to interest rate fluctuations than would investments in fixed rate obligations.

REITs may have limited financial resources, may utilize significant amounts of leverage, may trade less frequently and in a limited volume and may be subject to more abrupt or erratic price movements than larger company securities. Historically, REITs have been more volatile in price than the larger capitalization stocks included in Standard & Poor’s 500 Stock Index.

Other Investment Companies (including ETFs) Risk. Investments in the securities of other investment companies, including ETFs, may involve duplication of advisory fees and certain other expenses. By investing in another investment company or ETF, the Fund becomes a shareholder thereof. As a result, Fund shareholders indirectly bear the Fund’s proportionate share of the fees and expenses indirectly paid by shareholders of the other investment company or ETF, in addition to the fees and expenses Fund shareholders bear in connection with the Fund’s own operations. If the investment company or ETF fails to achieve its investment objective, the value of the Fund’s investment will decline, adversely affecting the Fund’s performance. In addition, closed-end investment company and ETF shares potentially may trade at a discount or a premium and are subject to brokerage and other trading costs, which could result in greater expenses to the Fund. In addition, the Fund may engage in short sales of the securities of other investment companies. When the Fund shorts securities of another investment company, it borrows shares of that investment company which it then sells. The Fund closes out a short sale by purchasing the security that it has sold short and returning that security to the entity that lent the security.

Cash Holdings Risk. To the extent the Fund holds cash positions, the Fund risks achieving lower returns and potential lost opportunities to participate in market appreciation which could negatively impact the Fund’s performance and ability to achieve its investment objective.

Cybersecurity Risk. Investment companies, such as the Fund, and their service providers are exposed to operational and information security risks resulting from cyberattacks, which may result in financial losses to a fund and its shareholders. Cyber-attacks include, among other behaviors, stealing or corrupting data maintained online or digitally, denial of service attacks on websites, “ransomware” that renders systems inoperable until ransom is paid, the unauthorized release of confidential information, or various other forms of cybersecurity breaches. Cyber-attacks affecting the Fund or the Adviser, custodian, transfer agent, distributor, administrator, intermediaries, trading counterparties, and other third-party service providers may adversely impact the Fund or the companies in which the Fund invests, causing the Fund’s investments to lose value or to prevent a shareholder redemption or purchase from clearing in a timely manner.

Forward Currency Exchange Contracts Risk. Forward contracts are contractual agreements to purchase or sell a specified currency at a specified future date (or within a specified time period) at a price set at the time of the contract. The Fund may not fully benefit from, or may lose money on, forward currency exchange transactions if changes in currency exchange rates do not occur as anticipated or do not correspond accurately to changes in the value of the Fund’s holdings.

Futures and Forward Contracts Risk. Futures contracts provide for the future sale by one party and purchase by another of a specific asset at a specific time and price (with or without delivery required). Futures contracts are standardized contracts traded on a recognized exchange. An option on a futures contract gives the purchaser the right, in exchange for a premium, to assume a position in a futures contract at a specified exercise price during the term of the option. Futures and forward contracts are subject to counterparty risk, meaning that the party who issues the derivatives (the clearinghouse or the broker holding the Fund’s position for a futures contract or the counterparty for a forward contract) may experience a significant credit event and may be unwilling or unable to make timely settlement payments or otherwise honor its obligations.

Interest Rate Transactions Risk. The Fund may enter into an interest rate swap, cap or floor transaction to attempt to protect itself from increasing dividend or interest expenses on its leverage resulting from increasing short-term interest rates and to hedge its portfolio securities. A decline in interest rates may result in a decline in the value of the swap or cap, which may result in a decline in the NAV of the Fund.

​

Calamos Global Dynamic Income Fund (CHW) (unaudited)

CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 21

Depending on the state of interest rates in general, the Fund’s use of interest rate swap or cap transactions could enhance or harm the overall performance of the common shares. To the extent there is a decline in interest rates, the value of the interest rate swap or cap could decline, and could result in a decline in the NAV of the common shares. In addition, if the counterparty to an interest rate swap or cap defaults, the Fund would not be able to use the anticipated net receipts under the swap or cap to offset the dividend or interest payments on the Fund’s leverage.

Depending on whether the Fund would be entitled to receive net payments from the counterparty on the swap or cap, which in turn would depend on the general state of short-term interest rates at that point in time, such a default could negatively impact the performance of the common shares. In addition, at the time an interest rate swap or cap transaction reaches its scheduled termination date, there is a risk that the Fund would not be able to obtain a replacement transaction or that the terms of the replacement would not be as favorable as on the expiring transaction. If either of these events occurs, it could have a negative impact on the performance of the common shares.

If the Fund fails to maintain a required 200% asset coverage of the liquidation value of any outstanding preferred shares or if the Fund loses its rating on its preferred shares or fails to maintain other covenants with respect to the preferred shares, the Fund may be required to redeem some or all of the preferred shares. Similarly, the Fund could be required to prepay the principal amount of any debt securities or other borrowings. Such redemption or prepayment would likely result in the Fund seeking to terminate early all or a portion of any swap or cap transaction. Early termination of a swap could result in a termination payment by or to the Fund. Early termination of a cap could result in a termination payment to the Fund. The Fund intends to segregate with its custodian cash or liquid securities having a value at least equal to the Fund’s net payment obligations under any swap transaction, marked-to-market daily.

Currently, certain categories of interest rate swaps are subject to mandatory clearing, and more are expected to be cleared in the future. The counterparty risk for cleared derivatives is generally lower than for uncleared OTC derivative transactions because generally a clearing organization becomes substituted for each counterparty to a cleared derivative contract and, in effect, guarantees the parties’ performance under the contract as each party to a trade looks only to the clearing house for performance of financial obligations. However, there can be no assurance that a clearing house, or its members, will satisfy the clearing house’s obligations to the Fund.

Market Impact Risk. The sale of our common shares (or the perception that such sales may occur) may have an adverse effect on prices in the secondary market for our common shares. An increase in the number of common shares available may put downward pressure on the market price for our common shares. These sales also might make it more difficult for us to sell additional equity securities in the future at a time and price the Fund deems appropriate.

Non-U.S. Government Obligation Risk. An investment in debt obligations of non-U.S. governments and their political subdivisions involves special risks that are not present in corporate debt obligations. The non-U.S. issuer of the sovereign debt or the non-U.S. governmental authorities that control the repayment of the debt may be unable or unwilling to repay principal or interest when due, and the Fund may have limited recourse in the event of a default. During periods of economic uncertainty, the market prices of sovereign debt may be more volatile than prices of debt obligations of U.S. issuers.

U.S. Government Security Risk. Some securities issued by U.S. Government agencies or government sponsored enterprises are not backed by the full faith and credit of the U.S. and may only be supported by the right of the agency or enterprise to borrow from the U.S. Treasury. There can be no assurance that the U.S. Government will always provide financial support to those agencies or enterprises.

Rule 144A Securities Risk. The Fund may invest in securities that are issued and sold through transactions under Rule 144A of the Securities Act of 1933. Under the supervision and oversight of the Board of Trustees, Calamos will determine whether Rule 144A Securities are illiquid. If qualified institutional buyers are unwilling to purchase these Rule 144A Securities, the percentage of the Fund’s assets invested in illiquid securities would increase. Typically, the Fund purchases Rule 144A Securities only if the Fund’s adviser has determined them to be liquid. If any Rule 144A Security held by the Fund should become illiquid, the value of the security may be reduced and a sale of the security may be more difficult.

Tax Risk. The Fund may invest in certain securities, such as certain convertible securities and high yield securities, for which the federal income tax treatment may not be clear or may be subject to re-characterization by the Internal Revenue Service (“IRS”). It could be more difficult for the Fund to comply with the federal income tax requirements applicable to regulated investment companies if the tax characterization of the Fund’s investments is not clear or if the tax treatment of the income from such investments was successfully challenged by the IRS. In addition, the tax treatment of the Fund may be affected by future interpretations of the Internal Revenue Code of 1986, as amended and changes in the tax laws and regulations, all of which may apply with retroactive effect.

​

Calamos Global Dynamic Income Fund (CHW) (unaudited)

22 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT

Contingent Liabilities Risk. Entering into derivative contracts in order to pursue the Fund’s various hedging strategies could require the Fund to fund cash payments in the future under certain circumstances, including an event of default or other early termination event, or the decision by a counterparty to request margin in the form of securities or other forms of collateral under the terms of the derivative contract or applicable laws. The amounts due with respect to a derivative contract would generally be equal to the unrealized loss of the open positions with the respective counterparty and could also include other fees and charges. These payments are contingent liabilities and therefore may not appear on the Fund’s balance sheet. The Fund’s ability to fund these contingent liabilities will depend on the liquidity of the Fund’s assets and access to capital at the time, and the need to fund these contingent liabilities could adversely impact our financial condition.

Antitakeover Provisions. The Fund’s Agreement and Declaration of Trust and By-Laws include provisions that could limit the ability of other entities or persons to acquire control of the Fund or to change the composition of its Board of Trustees. Such provisions could limit the ability of shareholders to sell their shares at a premium over prevailing market prices by discouraging a third party from seeking to obtain control of the Fund. These provisions include staggered terms of office for the Trustees, advance notice requirements for shareholder proposals, and super-majority voting requirements for certain transactions with affiliates, converting the Fund to an open-end investment company or a merger, asset sale or similar transaction. Holders of preferred shares have voting rights in addition to and separate from the voting rights of common shareholders with respect to certain of these matters. Holders of any preferred shares, voting separately as a single class, have the right to elect at least two Trustees at all times. The holders of preferred shares or debt, if any, on the one hand, and the holders of the common shares, on the other, may have interests that conflict with each other in certain situations, including conflicts that relate to the fees and expenses of the Fund.

Loan Risk. The Fund may invest in loans which may not be (i) rated at the time of investment, (ii) registered with the SEC or (iii) listed on a securities exchange. There may not be as much public information available regarding these loans as is available for other Fund investments, such as exchange-listed securities. As well, there may not be an active trading market for some loans, meaning they may be illiquid and more difficult to value than other more liquid securities. Settlement periods for loans are longer than for exchange-traded securities, typically ranging between 1 and 3 weeks, and in some cases much longer. There is no central clearinghouse for loan trades, and the loan market has not established enforceable settlement standards or remedies for failure to settle. Because the interest rates of floating-rate loans in which the Fund may invest may reset frequently, if market interest rates fall, the loans’ interest rates will be reset to lower levels, potentially reducing the Fund’s income. Because the adviser may wish to invest in the publicly-traded securities of an obligor, the Fund may not have access to material non-public information regarding the obligor to which other investors have access.

“Covenant-Lite” Loans Risk. Some of the loans in which the Fund may invest may be “covenant-lite” loans, which means the loans contain fewer or no maintenance covenants than other loans and do not include terms which allow the lender to monitor the performance of the borrower and declare a default if certain criteria are breached. The Fund may experience delays in enforcing its rights on its holdings of covenant-lite loans.

Short Selling Risk. The Fund will engage in short sales for investment and risk management purposes, including when the Adviser believes an investment will underperform due to a greater sensitivity to earnings growth of the issuer, default risk or interest rates. In times of unusual or adverse market, economic, regulatory or political conditions, the Fund may not be able, fully or partially, to implement its short selling strategy. Periods of unusual or adverse market, economic, regulatory or political conditions may exist for extended periods of time.

Short sales are transactions in which the Fund sells a security or other instrument that it does not own but can borrow in the market. Short selling allows the Fund to profit from a decline in market price to the extent such decline exceeds the transaction costs and the costs of borrowing the securities and to obtain a low cost means of financing long investments that the Adviser believes are attractive. If a security sold short increases in price, the Fund may have to cover its short position at a higher price than the short sale price, resulting in a loss. The Fund will have substantial short positions and must borrow those securities to make delivery to the buyer under the short sale transaction. The Fund may not be able to borrow a security that it needs to deliver or it may not be able to close out a short position at an acceptable price and may have to sell related long positions earlier than it had expected. Thus, the Fund may not be able to successfully implement its short sale strategy due to limited availability of desired securities or for other reasons. Also, there is the risk that the counterparty to a short sale may fail to honor its contractual terms, causing a loss to the Fund.

Generally, the Fund will have to pay a fee or premium to borrow securities and will be obligated to repay the lender of the security any dividends or interest that accrues on the security during the term of the loan. The amount of any gain from a short sale will be decreased, and the amount of any loss increased, by the amount of such fee, premium, dividends, interest or expense the Fund pays in connection with the short sale.

​

Calamos Global Dynamic Income Fund (CHW) (unaudited)

CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 23

Until the Fund replaces a borrowed security, it may be required to maintain a segregated account of cash or liquid assets with a broker or custodian to cover the Fund’s short posit ion. Generally, securities held in a segregated account cannot be sold unless they are replaced with other liquid assets. The Fund’s ability to access the pledged collateral may also be impaired in the event the broker becomes bankrupt, insolvent or otherwise fails to comply with the terms of the contract. In such instances the Fund may not be able to substitute or sell the pledged collateral and may experience significant delays in obtaining any recovery in a bankruptcy or other reorganization proceeding. The Fund may obtain only a limited recovery or may obtain no recovery in these circumstances. Additionally, the Fund must maintain sufficient liquid assets (less any additional collateral pledged to the broker), marked-to-market daily, to cover the borrowed securities obligations. This may limit the Fund’s investment flexibility, as well as its ability to meet other current obligations.

Because losses on short sales arise from increases in the value of the security sold short, such losses are theoretically unlimited. By contrast, a loss on a long position arises from decreases in the value of the security and is limited by the fact that a security’s value cannot decrease below zero. The Adviser’s use of short sales in combination with long positions in the Fund’s portfolio in an attempt to improve performance or reduce overall portfolio risk may not be successful and may result in greater losses or lower positive returns than if the Fund held only long positions. It is possible that the Fund’s long securities positions will decline in value at the same time that the value of its short securities positions increase, thereby increasing potential losses to the Fund. In addition, the Fund’s short selling strategies will limit its ability to fully benefit from increases in the fixed-income markets.

By investing the proceeds received from selling securities short, the Fund could be deemed to be employing a form of leverage, which creates special risks. The use of leverage may increase the Fund’s exposure to long securities positions and make any change in the Fund’s NAV greater than it would be without the use of leverage. This could result in increased volatility of returns. There is no guarantee that any leveraging strategy the Fund employs will be successful during any period in which it is employed.

Diminished Voting Power and Excess Cash Risk. The voting power of current shareholders will be diluted to the extent that such shareholders do not purchase shares in any future common share offerings or do not purchase sufficient shares to maintain their percentage interest. In addition, if the Fund is unable to invest the proceeds of such offering as intended, its per share distribution may decrease (or may consist of return of capital) and the Fund may not participate in market advances to the same extent as if such proceeds were fully invested as planned.

Senior Leverage Risk. Our preferred shares will be junior in liquidation and with respect to distribution rights to our debt securities and any other borrowings. Senior securities representing indebtedness may constitute a substantial lien and burden on preferred shares by reason of their prior claim against our income and against our net assets in liquidation. The Fund may not be permitted to declare dividends or other distributions with respect to any series of our preferred shares unless at such time the Fund meets applicable asset coverage requirements and the payment of principal or interest is not in default with respect to any borrowings.

Ratings and Asset Coverage Risk. To the extent that senior securities are rated, a rating does not eliminate or necessarily mitigate the risks of investing in our senior securities, and a rating may not fully or accurately reflect all of the credit and market risks associated with that senior security. A rating agency could downgrade the rating of our preferred shares or debt securities, which may make such securities less liquid in the secondary market, though probably with higher resulting interest rates. If a rating agency downgrades the rating assigned to a senior security, the Fund may alter its portfolio or redeem the senior security. The Fund may voluntarily redeem senior securities under certain circumstances.

IMPORTANT UPDATES ABOUT THE FUND

Change to Ratings Agency for the Mandatory Redeemable Preferred Shares (MRPS)

As of December 17, 2020, Kroll Bond Rating Agency LLC (“Kroll”) replaced Fitch Ratings, Inc. (“Fitch”) as the rating agency for the MRPS. The MRPS have been assigned a rating of ‘AA-’ by Kroll.

​

Schedule of Investments October 31, 2020

24 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT | See accompanying Notes to Schedule of Investments

PRINCIPAL AMOUNT |  |  |  | VALUE
Corporate Bonds (19.6%)
Airlines (0.3%)
7,009 | ​ | Air Canada Pass Through Trust Series 2013-1, Class B* 5.375%, 11/15/22 | $ | 6,389
78,333 | ​ | Air Canada Pass Through Trust Series 2015-2, Class B* 5.000%, 06/15/25 | ​ | 64,263
260,000 | ​ | Alaska Airlines Pass Through Trust Series 2020-1, Class A*µ 4.800%, 02/15/29 | ​ | 273,801
208,000 | ​ | Alaska Airlines Pass Through Trust Series 2020-1, Class B*µ 8.000%, 02/15/27 | ​ | 217,551
93,814 | ​ | Continental Airlines Pass Through Trust Series 2010-1, Class Aµ 4.750%, 07/12/22 | ​ | 94,141
216,000 | ​ | JetBlue Pass Through Trust Series 2020-1, Class Bµ 7.750%, 05/15/30 | ​ | 223,929
135,000 | ​ | Spirit Loyalty Cayman, Ltd. / Spirit IP Cayman, Ltd.* 8.000%, 09/20/25 | ​ | 143,438
119,071 | ​ | UAL Pass Through Trust Series 2007-1 6.636%, 01/02/24 | ​ | 111,167
230,177 | ​ | United Airlines Pass Through Trust Series 2014-2, Class Bµ 4.625%, 03/03/24 | ​ | 215,533
141,000 | ​ | United Airlines Pass Through Trust Series 2019-2, Class Bµ 3.500%, 11/01/29 | ​ | 111,155
| ​ |  | ​ | 1,461,367
Communication Services (3.0%)
235,000 | ​ | Altice France, SA* 7.375%, 05/01/26 | ​ | 245,648
350,000 | ​ | Arrow Bidco, LLC* 9.500%, 03/15/24 | ​ | 293,496
265,000 | ​ | Ashtead Capital, Inc.*µ 4.000%, 05/01/28 | ​ | 278,234
165,000 | ​ | Brink’s Company*^ 5.500%, 07/15/25 | ​ | 171,810
89,000 | ​ | Cable One, Inc.* 4.000%, 11/15/30 | ​ | 90,387
| ​ | CenturyLink, Inc.* | ​ | ​
310,000 | ​ | 4.000%, 02/15/27 | ​ | 317,868
140,000 | ​ | 5.125%, 12/15/26^ | ​ | 143,392
140,000 | ​ | Consolidated Communications, Inc.*^ 6.500%, 10/01/28 | ​ | 144,082
| ​ | CSC Holdings, LLC* | ​ | ​
460,000 | ​ | 5.500%, 05/15/26µ | ​ | 478,414
410,000 | ​ | 5.500%, 04/15/27 | ​ | 432,128
300,000 | ​ | 5.750%, 01/15/30 | ​ | 321,078

PRINCIPAL AMOUNT |  |  |  | VALUE
481,000 | ​ | Cumulus Media New Holdings, Inc.*^ 6.750%, 07/01/26 | $ | 448,393
| ​ | Diamond Sports Group, LLC / Diamond Sports Finance Company* | ​ | ​
180,000 | ​ | 6.625%, 08/15/27^ | ​ | 75,004
151,000 | ​ | 5.375%, 08/15/26 | ​ | 88,619
1,155,000 | ​ | Embarq Corp. 7.995%, 06/01/36 | ​ | 1,355,150
| ​ | Entercom Media Corp.* | ​ | ​
390,000 | ​ | 6.500%, 05/01/27 | ​ | 340,314
234,000 | ​ | 7.250%, 11/01/24^ | ​ | 197,922
| ​ | Frontier Communications Corp. | ​ | ​
689,000 | ​ | 7.625%, 04/15/24@ | ​ | 276,551
385,000 | ​ | 11.000%, 09/15/25@ | ​ | 161,677
210,000 | ​ | 8.500%, 04/01/26*@ | ​ | 212,321
80,000 | ​ | 5.875%, 10/15/27*^ | ​ | 81,678
69,000 | ​ | Go Daddy Operating Company, LLC / GD Finance Company, Inc.* 5.250%, 12/01/27 | ​ | 72,512
80,000 | ​ | Hughes Satellite Systems Corp.µ 5.250%, 08/01/26 | ​ | 86,010
| ​ | Intelsat Jackson Holdings, SA@ | ​ | ​
280,000 | ​ | 9.750%, 07/15/25* | ​ | 173,841
241,000 | ​ | 8.000%, 02/15/24* | ​ | 244,969
130,000 | ​ | 5.500%, 08/01/23 | ​ | 76,619
200,000 | ​ | LCPR Senior Secured Financing DAC*^ 6.750%, 10/15/27 | ​ | 212,654
| ​ | Netflix, Inc.*µ | ​ | ​
3,653,000 | ​ | 3.625%, 06/15/25^ | ​ | 3,802,919
200,000 | ​ | 4.875%, 06/15/30 | ​ | 228,698
312,000 | ​ | Scripps Escrow, Inc.* 5.875%, 07/15/27 | ​ | 304,805
111,000 | ​ | Shift4 Payments, LLC / Shift4 Payments Finance Sub, Inc.* 4.625%, 11/01/26 | ​ | 112,376
345,000 | ​ | Sirius XM Radio, Inc.*^ 4.625%, 07/15/24 | ​ | 356,106
| ​ | Sprint Corp. | ​ | ​
830,000 | ​ | 7.125%, 06/15/24 | ​ | 956,019
300,000 | ​ | 7.875%, 09/15/23 | ​ | 342,825
215,000 | ​ | Telecom Italia Capital, SAµ^ 6.000%, 09/30/34 | ​ | 250,931
223,000 | ​ | Telesat Canada / Telesat, LLC*µ 4.875%, 06/01/27 | ​ | 227,627
400,000 | ​ | United States Cellular Corp.µ 6.700%, 12/15/33 | ​ | 528,000
115,000 | ​ | Windstream Services, LLC / Windstream Finance Corp.@ 7.750%, 10/01/21 | ​ | 2,249
| ​ |  | ​ | 14,133,326
Consumer Discretionary (3.0%)
230,000 | ​ | American Axle & Manufacturing, Inc.^ 6.875%, 07/01/28 | ​ | 234,292

​

Schedule of Investments October 31, 2020

See accompanying Notes to Schedule of Investments | CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 25

PRINCIPAL AMOUNT |  |  |  | VALUE
| ​ | Ashton Woods USA, LLC / Ashton Woods Finance Company* | ​ | ​
204,000 | ​ | 6.625%, 01/15/28 | $ | 206,685
163,000 | ​ | 9.875%, 04/01/27^ | ​ | 182,539
390,000 | ​ | BorgWarner, Inc.*^ 5.000%, 10/01/25 | ​ | 453,570
355,000 | ​ | Boyd Gaming Corp.^ 6.000%, 08/15/26 | ​ | 364,762
| ​ | Caesars Entertainment, Inc.* | ​ | ​
112,000 | ​ | 8.125%, 07/01/27^ | ​ | 117,144
112,000 | ​ | 6.250%, 07/01/25 | ​ | 115,136
450,000 | ​ | Caesars Resort Collection, LLC / CRC Finco, Inc.*^ 5.250%, 10/15/25 | ​ | 428,287
112,000 | ​ | Carnival Corp.*^ 10.500%, 02/01/26 | ​ | 122,305
110,000 | ​ | Carvana Company* 5.625%, 10/01/25 | ​ | 108,487
| ​ | CCO Holdings, LLC / CCO Holdings Capital Corp.* | ​ | ​
735,000 | ​ | 5.125%, 05/01/27 | ​ | 772,713
125,000 | ​ | 5.000%, 02/01/28 | ​ | 131,609
110,000 | ​ | 4.250%, 02/01/31 | ​ | 112,647
207,000 | ​ | Cedar Fair, LP^ 5.250%, 07/15/29 | ​ | 187,790
| ​ | Century Communities, Inc. | ​ | ​
345,000 | ​ | 6.750%, 06/01/27 | ​ | 369,264
190,000 | ​ | 5.875%, 07/15/25^ | ​ | 196,589
550,000 | ​ | Dana Financing Luxembourg Sarl* 6.500%, 06/01/26 | ​ | 576,807
| ​ | DISH DBS Corp.^ | ​ | ​
209,000 | ​ | 7.750%, 07/01/26 | ​ | 222,108
50,000 | ​ | 7.375%, 07/01/28 | ​ | 50,409
| ​ | ESH Hospitality, Inc.* | ​ | ​
215,000 | ​ | 5.250%, 05/01/25 | ​ | 215,974
138,000 | ​ | 4.625%, 10/01/27^ | ​ | 135,668
| ​ | Expedia Group, Inc.*µ | ​ | ​
135,000 | ​ | 7.000%, 05/01/25 | ​ | 144,523
85,000 | ​ | 6.250%, 05/01/25 | ​ | 93,537
890,000 | ​ | Ford Motor Companyµ 8.500%, 04/21/23 | ​ | 983,468
| ​ | Ford Motor Credit Company, LLC | ​ | ​
350,000 | ​ | 4.063%, 11/01/24^ | ​ | 353,248
315,000 | ​ | 4.134%, 08/04/25µ | ​ | 315,246
315,000 | ​ | 3.664%, 09/08/24µ | ​ | 312,921
245,000 | ​ | G-III Apparel Group, Ltd.*µ 7.875%, 08/15/25 | ​ | 248,925
550,000 | ​ | goeasy, Ltd.*µ 5.375%, 12/01/24 | ​ | 561,115
55,000 | ​ | Group 1 Automotive, Inc.*µ 4.000%, 08/15/28 | ​ | 55,152
500,000 | ​ | Guitar Center, Inc.* 9.500%, 10/15/21 | ​ | 435,085

PRINCIPAL AMOUNT |  |  |  | VALUE
69,000 | ​ | Installed Building Products, Inc.* 5.750%, 02/01/28 | $ | 72,789
345,000 | ​ | International Game Technology, PLC*^ 6.250%, 01/15/27 | ​ | 367,211
| ​ | L Brands, Inc. | ​ | ​
245,000 | ​ | 6.875%, 11/01/35 | ​ | 249,506
113,000 | ​ | 9.375%, 07/01/25* | ​ | 131,332
56,000 | ​ | 6.875%, 07/01/25*µ | ​ | 60,108
55,000 | ​ | 6.694%, 01/15/27^ | ​ | 55,408
| ​ | M/I Homes, Inc. | ​ | ​
340,000 | ​ | 5.625%, 08/01/25^ | ​ | 352,322
205,000 | ​ | 4.950%, 02/01/28 | ​ | 213,823
110,000 | ​ | Macy’s Retail Holdings, LLC* 6.700%, 07/15/34 | ​ | 84,849
114,000 | ​ | Macy’s, Inc.*^ 8.375%, 06/15/25 | ​ | 119,090
| ​ | Mattel, Inc.* | ​ | ​
320,000 | ​ | 6.750%, 12/31/25 | ​ | 336,653
135,000 | ​ | 5.875%, 12/15/27^ | ​ | 146,795
350,000 | ​ | Mclaren Finance, PLC* 5.750%, 08/01/22 | ​ | 323,697
| ​ | Meredith Corp.^ | ​ | ​
230,000 | ​ | 6.500%, 07/01/25* | ​ | 237,838
60,000 | ​ | 6.875%, 02/01/26 | ​ | 49,829
252,000 | ​ | Newell Brands, Inc.µ 4.700%, 04/01/26 | ​ | 268,967
| ​ | Penske Automotive Group, Inc.^ | ​ | ​
345,000 | ​ | 5.500%, 05/15/26 | ​ | 356,526
160,000 | ​ | 5.375%, 12/01/24 | ​ | 163,480
| ​ | Rite Aid Corp. | ​ | ​
438,000 | ​ | 8.000%, 11/15/26* | ​ | 439,616
112,000 | ​ | 7.700%, 02/15/27 | ​ | 86,763
| ​ | Royal Caribbean Cruises, Ltd.*^ | ​ | ​
110,000 | ​ | 11.500%, 06/01/25 | ​ | 125,896
55,000 | ​ | 10.875%, 06/01/23 | ​ | 60,099
345,000 | ​ | Speedway Motorsports, LLC / Speedway Funding II, Inc.* 4.875%, 11/01/27 | ​ | 329,748
207,000 | ​ | Taylor Morrison Communities, Inc.*µ 5.750%, 01/15/28 | ​ | 229,323
345,000 | ​ | Twin River Worldwide Holdings, Inc.* 6.750%, 06/01/27 | ​ | 349,827
116,354 | ​ | US Airways Pass Through Trust Series 2012-2, Class B 6.750%, 12/03/22 | ​ | 105,412
55,000 | ​ | Viking Cruises, Ltd.* 13.000%, 05/15/25 | ​ | 62,186
295,000 | ​ | VOC Escrow, Ltd.*^ 5.000%, 02/15/28 | ​ | 256,697
| ​ |  | ​ | 14,443,795
Consumer Staples (0.7%)
112,000 | ​ | Central Garden & Pet Company 4.125%, 10/15/30 | ​ | 113,520

​

Schedule of Investments October 31, 2020

26 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT | See accompanying Notes to Schedule of Investments

PRINCIPAL AMOUNT |  |  |  | VALUE
210,000 | ​ | Dean Foods Company*@ 6.500%, 03/15/23 | $ | 3,572
112,000 | ​ | Edgewell Personal Care Company*µ 5.500%, 06/01/28 | ​ | 117,967
167,000 | ​ | Energizer Holdings, Inc.* 4.375%, 03/31/29 | ​ | 168,870
225,000 | ​ | Fresh Market, Inc.* 9.750%, 05/01/23 | ​ | 215,559
260,000 | ​ | JBS USA LUX, SA / JBS USA Finance, Inc.*µ 6.750%, 02/15/28 | ​ | 286,283
109,000 | ​ | JBS USA LUX, SA / JBS USA Food Company / JBS USA Finance, Inc.*µ 6.500%, 04/15/29 | ​ | 122,677
| ​ | Kraft Heinz Foods Company | ​ | ​
235,000 | ​ | 4.375%, 06/01/46µ | ​ | 241,618
56,000 | ​ | 4.250%, 03/01/31*µ | ​ | 60,845
56,000 | ​ | 3.875%, 05/15/27*^ | ​ | 59,327
| ​ | New Albertson’s, Inc. | ​ | ​
174,000 | ​ | 7.750%, 06/15/26 | ​ | 195,555
67,000 | ​ | 8.000%, 05/01/31 | ​ | 78,001
| ​ | Pilgrim’s Pride Corp.* | ​ | ​
405,000 | ​ | 5.875%, 09/30/27^ | ​ | 428,381
145,000 | ​ | 5.750%, 03/15/25 | ​ | 148,600
| ​ | Post Holdings, Inc.* | ​ | ​
310,000 | ​ | 5.750%, 03/01/27 | ​ | 325,153
72,000 | ​ | 5.625%, 01/15/28 | ​ | 75,955
55,000 | ​ | 4.625%, 04/15/30^ | ​ | 56,516
291,000 | ​ | Simmons Foods, Inc.* 7.750%, 01/15/24 | ​ | 304,307
245,000 | ​ | United Natural Foods, Inc.* 6.750%, 10/15/28 | ​ | 247,982
200,000 | ​ | Vector Group, Ltd.*µ 6.125%, 02/01/25 | ​ | 200,014
| ​ |  | ​ | 3,450,702
Energy (2.1%)
| ​ | Apache Corp. | ​ | ​
223,000 | ​ | 5.100%, 09/01/40 | ​ | 205,205
127,000 | ​ | 4.875%, 11/15/27 | ​ | 119,315
112,000 | ​ | 4.625%, 11/15/25^ | ​ | 106,374
210,000 | ​ | Bruin E&P Partners, LLC*@ 8.875%, 08/01/23 | ​ | 403
| ​ | Buckeye Partners, LP | ​ | ​
205,000 | ​ | 3.950%, 12/01/26 | ​ | 190,666
135,000 | ​ | 5.850%, 11/15/43^ | ​ | 120,053
| ​ | Calfrac Holdings, LP | ​ | ​
143,000 | ​ | 8.500%, 06/15/26* | ​ | 13,687
210,000 | ​ | ChampionX Corp. 6.375%, 05/01/26 | ​ | 201,064
350,000 | ​ | Chaparral Energy, Inc.*@ 8.750%, 07/15/23 | ​ | 18,970

PRINCIPAL AMOUNT |  |  |  | VALUE
295,000 | ​ | Cheniere Energy Partners, LP 5.625%, 10/01/26 | $ | 302,965
112,000 | ​ | Cheniere Energy, Inc.* 4.625%, 10/15/28 | ​ | 116,278
167,000 | ​ | Chesapeake Energy Corp.*@ 11.500%, 01/01/25 | ​ | 25,820
56,000 | ​ | CNX Resources Corp.*^ 7.250%, 03/14/27 | ​ | 59,149
| ​ | Continental Resources, Inc.^ | ​ | ​
230,000 | ​ | 3.800%, 06/01/24 | ​ | 214,944
170,000 | ​ | 4.375%, 01/15/28 | ​ | 153,184
410,000 | ​ | DCP Midstream Operating, LP*‡ 5.850%, 05/21/43 3 mo. USD LIBOR + 3.85% | ​ | 307,570
135,000 | ​ | Diamond Offshore Drilling, Inc.@ 7.875%, 08/15/25 | ​ | 9,489
615,000 | ​ | Energy Transfer Operating, LPµ‡ 3.232%, 11/01/66 3 mo. USD LIBOR + 3.02% | ​ | 317,832
| ​ | EnLink Midstream Partners, LP | ​ | ​
330,000 | ​ | 6.000%, 12/15/22‡ 3 mo. USD LIBOR + 4.11% | ​ | 142,798
224,000 | ​ | 4.850%, 07/15/26µ | ​ | 191,558
| ​ | EQT Corp. | ​ | ​
220,000 | ​ | 8.750%, 02/01/30^ | ​ | 273,636
90,000 | ​ | 7.875%, 02/01/25µ | ​ | 100,280
65,000 | ​ | 5.000%, 01/15/29 | ​ | 65,000
293,000 | ​ | Genesis Energy, LP / Genesis Energy Finance Corp. 6.250%, 05/15/26 | ​ | 235,467
| ​ | Gulfport Energy Corp. | ​ | ​
325,000 | ​ | 6.375%, 05/15/25 | ​ | 180,797
225,000 | ​ | 6.000%, 10/15/24 | ​ | 125,212
66,000 | ​ | Hess Midstream Operations, LP*µ 5.125%, 06/15/28 | ​ | 66,397
94,000 | ​ | HighPoint Operating Corp. 7.000%, 10/15/22 | ​ | 21,209
68,000 | ​ | Holly Energy Partners, LP / Holly Energy Finance Corp.*^ 5.000%, 02/01/28 | ​ | 63,730
229,000 | ​ | Laredo Petroleum, Inc. 10.125%, 01/15/28 | ​ | 100,300
480,000 | ​ | Lonestar Resources America, Inc.*@ 11.250%, 01/01/23 | ​ | 64,848
405,000 | ​ | Magnolia Oil & Gas Operating, LLC / Magnolia Oil & Gas Finance Corp.*^ 6.000%, 08/01/26 | ​ | 385,208
| ​ | Moss Creek Resources Holdings, Inc.* | ​ | ​
135,000 | ​ | 10.500%, 05/15/27 | ​ | 70,177
135,000 | ​ | 7.500%, 01/15/26 | ​ | 67,619
135,000 | ​ | Murphy Oil Corp.µ 5.875%, 12/01/27 | ​ | 106,680
111,000 | ​ | New Fortress Energy, Inc.* 6.750%, 09/15/25 | ​ | 114,654

​

Schedule of Investments October 31, 2020

See accompanying Notes to Schedule of Investments | CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 27

PRINCIPAL AMOUNT |  |  |  | VALUE
60,000 | ​ | Newfield Exploration Companyµ 5.750%, 01/30/22 | $ | 60,572
125,000 | ​ | Nine Energy Service, Inc.* 8.750%, 11/01/23 | ​ | 37,277
170,000 | ​ | Oasis Petroleum, Inc.*@ 6.250%, 05/01/26 | ​ | 34,014
| ​ | Occidental Petroleum Corp. | ​ | ​
690,000 | ​ | 4.300%, 08/15/39µ | ​ | 467,392
510,000 | ​ | 2.900%, 08/15/24^ | ​ | 425,309
169,000 | ​ | 5.875%, 09/01/25^ | ​ | 148,972
114,000 | ​ | 6.625%, 09/01/30^ | ​ | 100,034
60,000 | ​ | Ovintiv, Inc.^ 6.500%, 08/15/34 | ​ | 56,274
213,000 | ​ | Par Petroleum, LLC / Par Petroleum Finance Corp.* 7.750%, 12/15/25 | ​ | 172,752
205,000 | ​ | Parkland Fuel Corp.*^ 5.875%, 07/15/27 | ​ | 211,925
100,000 | ​ | Parsley Energy, LLC / Parsley Finance Corp.*µ 5.250%, 08/15/25 | ​ | 103,149
270,000 | ​ | Plains All American Pipeline, LPµ‡ 6.125%, 11/15/22 3 mo. USD LIBOR + 4.11% | ​ | 166,890
| ​ | Reliance Industries, Ltd.* | ​ | ​
1,000,000 | ​ | 5.400%, 02/14/22 | ​ | 1,052,370
850,000 | ​ | 4.125%, 01/28/25 | ​ | 934,702
275,000 | ​ | SESI, LLC 7.750%, 09/15/24 | ​ | 66,253
87,000 | ​ | SM Energy Company*^ 10.000%, 01/15/25 | ​ | 83,123
56,000 | ​ | Southwestern Energy Company^ 8.375%, 09/15/28 | ​ | 58,756
147,000 | ​ | Transocean, Inc.* 11.500%, 01/30/27 | ​ | 49,141
365,000 | ​ | Vine Oil & Gas, LP / Vine Oil & Gas Finance Corp.* 8.750%, 04/15/23 | ​ | 268,691
135,000 | ​ | Viper Energy Partners, LP*^ 5.375%, 11/01/27 | ​ | 137,835
385,000 | ​ | W&T Offshore, Inc.* 9.750%, 11/01/23 | ​ | 254,208
128,000 | ​ | Weatherford International, Ltd.*^ 11.000%, 12/01/24 | ​ | 75,799
56,000 | ​ | WPX Energy, Inc. 5.875%, 06/15/28 | ​ | 57,644
| ​ |  | ​ | 9,881,620
Financials (2.9%)
717,000 | ​ | Acrisure, LLC / Acrisure Finance, Inc.*^ 7.000%, 11/15/25 | ​ | 717,473
246,000 | ​ | AG Issuer, LLC* 6.250%, 03/01/28 | ​ | 241,405

PRINCIPAL AMOUNT |  |  |  | VALUE
400,000 | ​ | Alliant Holdings Intermediate, LLC / Alliant Holdings Co-Issuer*^ 6.750%, 10/15/27 | $ | 420,444
300,000 | ​ | Ally Financial, Inc. 8.000%, 11/01/31 | ​ | 415,524
540,000 | ​ | Amwins Group, Inc.* 7.750%, 07/01/26 | ​ | 579,101
470,000 | ​ | AssuredPartners, Inc.* 7.000%, 08/15/25 | ​ | 480,580
| ​ | Aviation Capital Group, LLC*µ | ​ | ​
248,000 | ​ | 3.500%, 11/01/27 | ​ | 219,656
116,000 | ​ | 3.875%, 05/01/23 | ​ | 116,218
55,000 | ​ | 6.750%, 04/06/21 | ​ | 55,935
620,000 | ​ | Brookfield Property REIT, Inc. / BPR Cumulus, LLC / BPR Nimbus, LLC / GGSI Sellco, LLC*^ 5.750%, 05/15/26 | ​ | 515,115
| ​ | Credit Acceptance Corp.^ | ​ | ​
350,000 | ​ | 6.625%, 03/15/26 | ​ | 363,881
237,000 | ​ | 5.125%, 12/31/24* | ​ | 237,415
70,000 | ​ | Cushman & Wakefield US Borrower, LLC*^ 6.750%, 05/15/28 | ​ | 74,694
345,000 | ​ | Donnelley Financial Solutions, Inc.^ 8.250%, 10/15/24 | ​ | 363,237
110,000 | ​ | Genworth Mortgage Holdings, Inc.*µ 6.500%, 08/15/25 | ​ | 114,901
227,975 | ​ | Global Aircraft Leasing Company, Ltd.* 6.500%, 09/15/24 13.750% PIK rate | ​ | 153,026
417,000 | ​ | Greystar Real Estate Partners, LLC* 5.750%, 12/01/25 | ​ | 424,327
57,000 | ​ | HAT Holdings I, LLC / HAT Holdings II, LLC*µ^ 6.000%, 04/15/25 | ​ | 60,202
910,000 | ​ | HUB International, Ltd.* 7.000%, 05/01/26 | ​ | 934,424
325,000 | ​ | Icahn Enterprises, LP / Icahn Enterprises Finance Corp.µ 5.250%, 05/15/27 | ​ | 336,963
500,000 | ​ | ILFC E-Capital Trust II*µ‡ 3.230%, 12/21/65 3 mo. USD LIBOR + 1.80% | ​ | 283,235
465,000 | ​ | Iron Mountain, Inc.*µ^ 5.250%, 03/15/28 | ​ | 480,233
350,000 | ​ | Jefferies Finance, LLC / JFIN Co-Issuer Corp.*µ 6.250%, 06/03/26 | ​ | 358,638
| ​ | Ladder Capital Finance Holdings LLLP / Ladder Capital Finance Corp.* | ​ | ​
502,000 | ​ | 5.250%, 10/01/25 | ​ | 459,932
62,000 | ​ | 4.250%, 02/01/27^ | ​ | 53,879
260,000 | ​ | Level 3 Financing, Inc.µ 5.375%, 05/01/25 | ​ | 267,600

​

Schedule of Investments October 31, 2020

28 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT | See accompanying Notes to Schedule of Investments

PRINCIPAL AMOUNT |  |  |  | VALUE
487,000 | ​ | MetLife, Inc.µ 6.400%, 12/15/66 | $ | 610,250
110,000 | ​ | MGIC Investment Corp.µ 5.250%, 08/15/28 | ​ | 113,634
| ​ | Navient Corp.^ | ​ | ​
623,000 | ​ | 5.000%, 03/15/27 | ​ | 582,374
275,000 | ​ | 6.750%, 06/25/25 | ​ | 280,055
145,000 | ​ | NexBank Capital, Inc.*‡& 6.375%, 09/30/27 3 mo. USD LIBOR + 4.59% | ​ | 146,579
| ​ | OneMain Finance Corp. | ​ | ​
497,000 | ​ | 6.875%, 03/15/25^ | ​ | 547,515
350,000 | ​ | 7.125%, 03/15/26µ | ​ | 388,349
90,000 | ​ | 8.875%, 06/01/25µ | ​ | 99,078
69,000 | ​ | 6.625%, 01/15/28µ | ​ | 75,614
| ​ | Park Intermediate Holdings, LLC / PK Domestic Property, LLC / PK Finance Co-Issuer* | ​ | ​
134,000 | ​ | 7.500%, 06/01/25 | ​ | 140,889
110,000 | ​ | 5.875%, 10/01/28 | ​ | 108,505
345,000 | ​ | Radian Group, Inc.µ 4.875%, 03/15/27 | ​ | 354,964
135,000 | ​ | SLM Corp.µ 4.200%, 10/29/25 | ​ | 137,184
365,000 | ​ | Starwood Property Trust, Inc. 4.750%, 03/15/25 | ​ | 355,568
227,000 | ​ | StoneX Group, Inc.*µ 8.625%, 06/15/25 | ​ | 242,813
120,000 | ​ | Tronox Finance, PLC* 5.750%, 10/01/25 | ​ | 120,000
167,000 | ​ | United Shore Financial Services, LLC* 5.500%, 11/15/25 | ​ | 168,159
| ​ | VICI Properties, LP / VICI Note Company, Inc.*µ | ​ | ​
272,000 | ​ | 3.750%, 02/15/27^ | ​ | 273,262
152,000 | ​ | 4.625%, 12/01/29 | ​ | 158,203
237,000 | ​ | XHR, LP* 6.375%, 08/15/25 | ​ | 235,507
| ​ |  | ​ | 13,866,540
Health Care (1.9%)
| ​ | Acadia Healthcare Company, Inc. | ​ | ​
400,000 | ​ | 6.500%, 03/01/24 | ​ | 411,732
112,000 | ​ | 5.000%, 04/15/29* | ​ | 115,859
500,000 | ​ | Bausch Health Americas, Inc.* 8.500%, 01/31/27 | ​ | 547,240
245,000 | ​ | Bausch Health Companies, Inc.* 5.000%, 01/30/28 | ​ | 242,261
| ​ | Centene Corp. | ​ | ​
1,435,000 | ​ | 4.750%, 01/15/25 | ​ | 1,475,840
276,000 | ​ | 4.250%, 12/15/27 | ​ | 290,951
111,000 | ​ | 3.000%, 10/15/30 | ​ | 115,319

PRINCIPAL AMOUNT |  |  |  | VALUE
| ​ | CHS/Community Health Systems, Inc. | ​ | ​
1,135,000 | ​ | 8.125%, 06/30/24* | $ | 876,152
295,000 | ​ | 8.000%, 03/15/26*^ | ​ | 296,578
225,000 | ​ | 6.250%, 03/31/23^ | ​ | 223,373
| ​ | DaVita, Inc.* | ​ | ​
282,000 | ​ | 4.625%, 06/01/30 | ​ | 286,884
55,000 | ​ | 3.750%, 02/15/31 | ​ | 52,938
| ​ | Encompass Health Corp. | ​ | ​
110,000 | ​ | 4.750%, 02/01/30 | ​ | 114,696
110,000 | ​ | 4.500%, 02/01/28 | ​ | 112,863
315,000 | ​ | HCA, Inc.µ 7.500%, 11/06/33 | ​ | 424,976
480,000 | ​ | Mallinckrodt International Finance, SA / Mallinckrodt CB, LLC*@ 5.625%, 10/15/23 | ​ | 156,000
305,000 | ​ | Team Health Holdings, Inc.*^ 6.375%, 02/01/25 | ​ | 187,853
| ​ | Tenet Healthcare Corp. | ​ | ​
605,000 | ​ | 6.250%, 02/01/27*^ | ​ | 629,055
365,000 | ​ | 6.875%, 11/15/31 | ​ | 363,890
345,000 | ​ | 4.875%, 01/01/26* | ​ | 350,510
183,000 | ​ | Teva Pharmaceutical Finance Company, BVµ 2.950%, 12/18/22 | ​ | 177,481
| ​ | Teva Pharmaceutical Finance Netherlands III, BVµ | ​ | ​
615,000 | ​ | 2.800%, 07/21/23 | ​ | 584,330
495,000 | ​ | 6.000%, 04/15/24 | ​ | 499,980
645,000 | ​ | West Street Merger Sub, Inc.* 6.375%, 09/01/25 | ​ | 655,830
| ​ |  | ​ | 9,192,591
Industrials (2.7%)
225,000 | ​ | Abercrombie & Fitch Management Company* 8.750%, 07/15/25 | ​ | 240,746
235,000 | ​ | ACCO Brands Corp.*^ 5.250%, 12/15/24 | ​ | 241,105
| ​ | Albertsons Companies, Inc. / Safeway, Inc. / New Albertsons, LP / Albertsons, LLC* | ​ | ​
207,000 | ​ | 4.875%, 02/15/30^ | ​ | 220,138
185,000 | ​ | 4.625%, 01/15/27 | ​ | 192,174
| ​ | Allison Transmission, Inc.* | ​ | ​
275,000 | ​ | 4.750%, 10/01/27^ | ​ | 285,434
70,000 | ​ | 5.875%, 06/01/29 | ​ | 76,526
| ​ | American Airlines Group, Inc.* | ​ | ​
218,000 | ​ | 5.000%, 06/01/22 | ​ | 143,860
55,000 | ​ | 3.750%, 03/01/25^ | ​ | 27,430
475,000 | ​ | ARD Finance, SA* 6.500%, 06/30/27 7.250% PIK rate | ​ | 483,018
| ​ | Avolon Holdings Funding, Ltd.*µ | ​ | ​
137,000 | ​ | 5.250%, 05/15/24 | ​ | 139,791
115,000 | ​ | 2.875%, 02/15/25 | ​ | 108,026

​

Schedule of Investments October 31, 2020

See accompanying Notes to Schedule of Investments | CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 29

PRINCIPAL AMOUNT |  |  |  | VALUE
365,000 | ​ | Beacon Roofing Supply, Inc.* 4.875%, 11/01/25 | $ | 358,773
207,000 | ​ | Cascades, Inc. /Cascades USA, Inc.*^ 5.125%, 01/15/26 | ​ | 216,683
| ​ | Delta Air Lines, Inc. | ​ | ​
57,000 | ​ | 7.375%, 01/15/26^ | ​ | 59,024
57,000 | ​ | 3.800%, 04/19/23 | ​ | 54,454
| ​ | Delta Air Lines, Inc. / SkyMiles IP, Ltd.*µ | ​ | ​
56,000 | ​ | 4.750%, 10/20/28 | ​ | 57,305
28,000 | ​ | 4.500%, 10/20/25 | ​ | 28,446
140,000 | ​ | EnerSys*µ 4.375%, 12/15/27 | ​ | 144,187
590,000 | ​ | Fly Leasing, Ltd.^ 5.250%, 10/15/24 | ​ | 488,254
112,000 | ​ | GFL Environmental, Inc.*^ 3.750%, 08/01/25 | ​ | 112,893
| ​ | Golden Nugget, Inc.* | ​ | ​
285,000 | ​ | 6.750%, 10/15/24 | ​ | 241,757
210,000 | ​ | 8.750%, 10/01/25^ | ​ | 172,744
124,000 | ​ | Graham Packaging Company, Inc.* 7.125%, 08/15/28 | ​ | 130,318
140,000 | ​ | Granite US Holdings Corp.*^ 11.000%, 10/01/27 | ​ | 145,803
175,000 | ​ | Graphic Packaging International, LLC*µ 4.750%, 07/15/27 | ​ | 190,747
200,000 | ​ | Great Lakes Dredge & Dock Corp. 8.000%, 05/15/22 | ​ | 206,062
480,000 | ​ | H&E Equipment Services, Inc. 5.625%, 09/01/25 | ​ | 498,365
340,000 | ​ | Herc Holdings, Inc.* 5.500%, 07/15/27 | ​ | 350,074
| ​ | Howmet Aerospace, Inc.^ | ​ | ​
200,000 | ​ | 5.125%, 10/01/24 | ​ | 210,770
103,000 | ​ | 6.875%, 05/01/25 | ​ | 114,669
400,000 | ​ | Jeld-Wen, Inc.* 4.625%, 12/15/25 | ​ | 406,476
238,000 | ​ | KeHE Distributors, LLC / KeHE Finance Corp.* 8.625%, 10/15/26 | ​ | 257,935
171,000 | ​ | Ken Garff Automotive, LLC* 4.875%, 09/15/28 | ​ | 170,285
110,000 | ​ | MasTec, Inc.*µ^ 4.500%, 08/15/28 | ​ | 113,164
560,000 | ​ | Meritor, Inc.^ 6.250%, 02/15/24 | ​ | 570,937
170,000 | ​ | Moog, Inc.*^ 4.250%, 12/15/27 | ​ | 174,731
340,000 | ​ | Nationstar Mortgage Holdings, Inc.* 6.000%, 01/15/27 | ​ | 340,415
| ​ | Navistar International Corp.* | ​ | ​
455,000 | ​ | 6.625%, 11/01/25 | ​ | 471,052
113,000 | ​ | 9.500%, 05/01/25 | ​ | 125,291

PRINCIPAL AMOUNT |  |  |  | VALUE
272,000 | ​ | Novelis Corp.*^ 4.750%, 01/30/30 | $ | 276,251
260,000 | ​ | Park-Ohio Industries, Inc.^ 6.625%, 04/15/27 | ​ | 249,805
140,000 | ​ | Patrick Industries, Inc.* 7.500%, 10/15/27 | ​ | 152,054
189,000 | ​ | Peninsula Pacific Entertainment, LLC / Peninsula Pacific Entertainment Finance In* 8.500%, 11/15/27 | ​ | 196,942
56,000 | ​ | Picasso Finance Sub, Inc.* 6.125%, 06/15/25 | ​ | 59,182
240,000 | ​ | QVC, Inc.µ^ 4.375%, 09/01/28 | ​ | 240,617
185,000 | ​ | Scientific Games International, Inc.*^ 5.000%, 10/15/25 | ​ | 186,008
137,000 | ​ | SEG Holding, LLC / SEG Finance Corp.* 5.625%, 10/15/28 | ​ | 139,306
110,000 | ​ | Sensata Technologies, Inc.*µ 3.750%, 02/15/31 | ​ | 109,040
| ​ | Standard Industries, Inc.* | ​ | ​
115,000 | ​ | 5.000%, 02/15/27µ | ​ | 119,165
56,000 | ​ | 4.375%, 07/15/30^ | ​ | 58,007
| ​ | Station Casinos, LLC*^ | ​ | ​
400,000 | ​ | 4.500%, 02/15/28 | ​ | 377,176
343,000 | ​ | 5.000%, 10/01/25 | ​ | 341,724
166,000 | ​ | STL Holding Company, LLC* 7.500%, 02/15/26 | ​ | 165,436
205,000 | ​ | Tennant Company^ 5.625%, 05/01/25 | ​ | 212,597
200,000 | ​ | TransDigm UK Holdings, PLC 6.875%, 05/15/26 | ​ | 199,272
| ​ | TransDigm, Inc. | ​ | ​
205,000 | ​ | 7.500%, 03/15/27^ | ​ | 212,120
200,000 | ​ | 6.250%, 03/15/26* | ​ | 208,754
56,000 | ​ | United Rentals North America, Inc.^ 3.875%, 02/15/31 | ​ | 56,780
195,000 | ​ | Waste Pro USA, Inc.* 5.500%, 02/15/26 | ​ | 197,685
| ​ | WESCO Distribution, Inc.* | ​ | ​
136,000 | ​ | 7.125%, 06/15/25^ | ​ | 147,031
67,000 | ​ | 7.250%, 06/15/28 | ​ | 73,466
55,000 | ​ | WR Grace & Co-Conn*^ 4.875%, 06/15/27 | ​ | 57,366
350,000 | ​ | XPO Logistics, Inc.*µ 6.750%, 08/15/24 | ​ | 370,709
| ​ |  | ​ | 12,976,355
Information Technology (1.3%)
140,000 | ​ | CDK Global, Inc.*^ 5.250%, 05/15/29 | ​ | 150,354
2,770,000 | ​ | CDW, LLC / CDW Finance Corp.^ 4.125%, 05/01/25 | ​ | 2,876,645

​

Schedule of Investments October 31, 2020

30 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT | See accompanying Notes to Schedule of Investments

PRINCIPAL AMOUNT |  |  |  | VALUE
200,000 | ​ | CommScope Technologies, LLC*^ 6.000%, 06/15/25 | $ | 198,608
| ​ | Dell International, LLC / EMC Corp.*µ | ​ | ​
1,425,000 | ​ | 5.450%, 06/15/23 | ​ | 1,567,985
310,000 | ​ | 6.020%, 06/15/26 | ​ | 367,765
138,000 | ​ | Fair Isaac Corp.*^ 4.000%, 06/15/28 | ​ | 142,993
245,000 | ​ | KBR, Inc.* 4.750%, 09/30/28 | ​ | 248,952
112,000 | ​ | MPH Acquisition Holdings, LLC*^ 5.750%, 11/01/28 | ​ | 109,990
207,000 | ​ | MTS Systems Corp.* 5.750%, 08/15/27 | ​ | 210,142
167,000 | ​ | ON Semiconductor Corp.*µ 3.875%, 09/01/28 | ​ | 170,158
204,000 | ​ | Open Text Corp.*µ 3.875%, 02/15/28 | ​ | 207,535
| ​ |  | ​ | 6,251,127
Materials (1.2%)
140,000 | ​ | Allegheny Technologies, Inc.^ 5.875%, 12/01/27 | ​ | 132,000
195,000 | ​ | ArcelorMittal, SA 7.250%, 10/15/39 | ​ | 238,526
114,000 | ​ | Big River Steel, LLC / BRS Finance Corp.* 6.625%, 01/31/29 | ​ | 117,555
245,000 | ​ | Clearwater Paper Corp.* 4.750%, 08/15/28 | ​ | 249,361
2,130,000 | ​ | First Quantum Minerals, Ltd.*^ 7.250%, 04/01/23 | ​ | 2,144,335
| ​ | Freeport-McMoRan, Inc. | ​ | ​
125,000 | ​ | 5.450%, 03/15/43µ | ​ | 142,802
115,000 | ​ | 5.400%, 11/14/34^ | ​ | 131,497
167,000 | ​ | HB Fuller Company 4.250%, 10/15/28 | ​ | 170,131
177,000 | ​ | Hudbay Minerals, Inc.* 6.125%, 04/01/29 | ​ | 182,075
215,000 | ​ | JW Aluminum Continuous Cast Company* 10.250%, 06/01/26 | ​ | 226,090
| ​ | Kaiser Aluminum Corp.* | ​ | ​
200,000 | ​ | 4.625%, 03/01/28 | ​ | 198,728
111,000 | ​ | 6.500%, 05/01/25 | ​ | 118,043
70,000 | ​ | Mineral Resources, Ltd.* 8.125%, 05/01/27 | ​ | 76,738
| ​ | New Gold, Inc.* | ​ | ​
259,000 | ​ | 6.375%, 05/15/25 | ​ | 268,966
57,000 | ​ | 7.500%, 07/15/27 | ​ | 61,615
69,000 | ​ | Norbord, Inc.*^ 5.750%, 07/15/27 | ​ | 73,108
240,000 | ​ | OCI, NV*^ 4.625%, 10/15/25 | ​ | 243,415

PRINCIPAL AMOUNT |  |  |  | VALUE
112,000 | ​ | Owens-Brockway Glass Container, Inc.*^ 6.625%, 05/13/27 | $ | 120,297
| ​ | PBF Holding Company, LLC / PBF Finance Corp. | ​ | ​
560,000 | ​ | 7.250%, 06/15/25 | ​ | 235,340
56,000 | ​ | 9.250%, 05/15/25*µ | ​ | 50,054
200,000 | ​ | Silgan Holdings, Inc.µ 4.125%, 02/01/28 | ​ | 207,848
201,000 | ​ | Univar Solutions USA, Inc.* 5.125%, 12/01/27 | ​ | 208,742
| ​ |  | ​ | 5,597,266
Real Estate (0.2%)
360,000 | ​ | CBL & Associates, LP 5.250%, 12/01/23 | ​ | 136,800
| ​ | Forestar Group, Inc.* | ​ | ​
345,000 | ​ | 8.000%, 04/15/24 | ​ | 363,502
187,000 | ​ | 5.000%, 03/01/28 | ​ | 185,728
| ​ | Service Properties Trustµ | ​ | ​
345,000 | ​ | 4.350%, 10/01/24 | ​ | 306,402
105,000 | ​ | 5.250%, 02/15/26 | ​ | 91,812
| ​ |  | ​ | 1,084,244
Utilities (0.3%)
175,000 | ​ | NRG Energy, Inc.µ 6.625%, 01/15/27 | ​ | 184,338
475,000 | ​ | PPL Capital Funding, Inc.µ‡ 2.885%, 03/30/67 3 mo. USD LIBOR + 2.67% | ​ | 376,656
| ​ | Talen Energy Supply, LLC* | ​ | ​
140,000 | ​ | 10.500%, 01/15/26 | ​ | 97,397
70,000 | ​ | 7.250%, 05/15/27^ | ​ | 70,262
360,000 | ​ | TerraForm Power Operating, LLC*µ 5.000%, 01/31/28 | 395,932
| ​ |  | ​ | 1,124,585
| ​ | ​ | Total Corporate Bonds (Cost $97,728,017) | ​ | 93,463,518
Convertible Bonds (34.0%)
Communication Services (3.4%)
325,000 | ​ | Bharti Airtel, Ltd.* 1.500%, 02/17/25 | ​ | 359,977
100,000 | EUR | Cellnex Telecom, SAµ 1.500%, 01/16/26 | ​ | 213,929
20,000,000 | JPY | CyberAgent, Inc. 0.000%, 02/19/25 | ​ | 241,379
185,000 | ​ | iQIYI, Inc. 2.000%, 04/01/25 | ​ | 185,444
200,000 | ​ | Kakao Corp. 0.000%, 04/28/23 | ​ | 205,392
30,000,000 | JPY | Konami Holdings Corp.µ 0.000%, 12/22/22 | ​ | 323,514

​

Schedule of Investments October 31, 2020

See accompanying Notes to Schedule of Investments | CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 31

PRINCIPAL AMOUNT |  |  |  | VALUE
285,000 | ​ | Liberty Media Corp.µ 1.375%, 10/15/23 | $ | 319,368
153,000 | ​ | Liberty Media Corp. / Liberty Formula Oneµ 1.000%, 01/30/23 | ​ | 180,646
2,125,000 | ​ | Live Nation Entertainment, Inc. 2.500%, 03/15/23 | ​ | 2,277,277
250,000 | ​ | Match Group FinanceCo 3, Inc.*µ 2.000%, 01/15/30 | ​ | 398,088
5,222,000 | ​ | Sea, Ltd.*^ 2.375%, 12/01/25 | ​ | 9,878,718
544,000 | ​ | Snap, Inc.µ 0.750%, 08/01/26 | ​ | 1,012,313
490,000 | ​ | Twitter, Inc.^ 0.250%, 06/15/24 | ​ | 537,275
165,000 | ​ | Zynga, Inc.µ 0.250%, 06/01/24 | ​ | 209,436
| ​ |  | ​ | 16,342,756
Consumer Discretionary (9.8%)
152,000 | ​ | Baozun, Inc. 1.625%, 05/01/24 | ​ | 150,398
3,755,000 | ​ | Booking Holdings, Inc.*^ 0.750%, 05/01/25 | ​ | 4,730,624
2,084,000 | ​ | Burlington Stores, Inc.* 2.250%, 04/15/25 | ​ | 2,386,034
261,000 | ​ | Carnival Corp.* 5.750%, 04/01/23 | ​ | 406,985
2,280,000 | ​ | Chegg, Inc.* 0.000%, 09/01/26 | ​ | 2,308,227
2,000,000 | HKD | China Yuhua Education Corp, Ltd. 0.900%, 12/27/24 | ​ | 275,867
100,000 | EUR | Delivery Hero, SEµ 0.250%, 01/23/24 | ​ | 139,432
705,000 | ​ | DISH Network Corp. 2.375%, 03/15/24 | ​ | 637,306
4,556,000 | ​ | Etsy, Inc.*^ 0.125%, 09/01/27 | ​ | 4,746,395
4,441,000 | ​ | Fiverr International, Ltd.* 0.000%, 11/01/25 | ​ | 4,584,489
100,000 | EUR | HelloFresh, SEµ 0.750%, 05/13/25 | ​ | 143,461
162,000 | ​ | K12, Inc.* 1.125%, 09/01/27 | ​ | 138,202
4,887,000 | ​ | Liberty Broadband Corp.* 2.750%, 09/30/50 | ​ | 5,251,815
| ​ | Liberty Interactive, LLC | ​ | ​
330,000 | ​ | 4.000%, 11/15/29 | ​ | 238,834
160,000 | ​ | 3.750%, 02/15/30 | ​ | 117,917
| ​ | NCL Corp., Ltd.*µ | ​ | ​
327,000 | ​ | 5.375%, 08/01/25 | ​ | 376,099
195,000 | ​ | 6.000%, 05/15/24 | ​ | 277,826

PRINCIPAL AMOUNT |  |  |  | VALUE
100,000 | GBP | Ocado Group, PLCµ 0.750%, 01/18/27 | $ | 142,067
1,515,000 | ​ | Penn National Gaming, Inc.µ^ 2.750%, 05/15/26 | ​ | 3,744,307
45,000 | ​ | RHµ 0.000%, 06/15/23 | ​ | 81,715
6,697,000 | ​ | Royal Caribbean Cruises, Ltd.* 4.250%, 06/15/23 | ​ | 6,975,461
168,500 | EUR | SEB, SAµ 0.000%, 11/17/21 | ​ | 355,466
47,000 | ​ | Tesla, Inc.µ 2.000%, 05/15/24 | ​ | 294,058
1,950,000 | ​ | Under Armour, Inc.*µ 1.500%, 06/01/24 | ​ | 2,808,702
318,000 | ​ | Wayfair, Inc.* 0.625%, 10/01/25 | ​ | 304,412
3,600,000 | EUR | Zalando, SE 0.050%, 08/06/25 | ​ | 4,975,022
| ​ |  | ​ | 46,591,121
Consumer Staples (0.6%)
800,000 | ​ | Carrefour, SA 0.000%, 03/27/24 | ​ | 773,048
260,000 | ​ | Luckin Coffee, Inc.* 0.750%, 01/15/25 | ​ | 127,603
20,000,000 | JPY | Nippon Flour Mills Company, Ltd. 0.000%, 06/20/25 | ​ | 197,268
2,074,000 | CAD | Premium Brands Holdings Corp.µ 4.600%, 12/31/23 | ​ | 1,667,778
179,000 | ​ | Turning Point Brands, Inc. 2.500%, 07/15/24 | ​ | 179,150
| ​ |  | ​ | 2,944,847
Energy (0.1%)
151,000 | ​ | Nabors Industries, Inc. 0.750%, 01/15/24 | ​ | 37,267
424,000 | ​ | Pioneer Natural Resources Company*^ 0.250%, 05/15/25 | ​ | 452,586
| ​ | SunEdison, Inc.@ | ​ | ​
2,261,000 | ​ | 0.250%, 01/15/20* | ​ | 30,297
275,000 | ​ | 2.000%, 10/01/18 | ​ | 3,685
| ​ |  | ​ | 523,835
Financials (0.6%)
880,000 | ​ | AXA, SA* 7.250%, 05/15/21 | ​ | 874,491
600,000 | EUR | Corestate Capital Holding, SA 1.375%, 11/28/22 | ​ | 556,635
150,000 | ​ | GSK Finance No 3, PLC* 0.000%, 06/22/23 | ​ | 158,810
200,000 | ​ | JPMorgan Chase Bank, N.A.µ 0.000%, 08/07/22 | ​ | 278,302
200,000 | EUR | LEG Immobilien, AGµ 0.875%, 09/01/25 | ​ | 283,585

​

Schedule of Investments October 31, 2020

32 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT | See accompanying Notes to Schedule of Investments

PRINCIPAL AMOUNT |  |  |  | VALUE
200,000 | EUR | Oliver Capital Sarl 0.000%, 12/29/23 | $ | 237,195
350,000 | ​ | Prospect Capital Corp. 4.950%, 07/15/22 | ​ | 359,670
210,000 | ​ | Starwood Property Trust, Inc. 4.375%, 04/01/23 | ​ | 202,955
| ​ |  | ​ | 2,951,643
Health Care (2.8%)
135,000 | ​ | Coherus Biosciences, Inc.* 1.500%, 04/15/26 | ​ | 151,496
4,717,000 | ​ | DexCom, Inc.* 0.250%, 11/15/25 | ​ | 4,564,971
100,000 | EUR | GN Store Nord, A/Sµ 0.000%, 05/21/24 | ​ | 134,477
73,000 | ​ | Innoviva, Inc. 2.500%, 08/15/25 | ​ | 73,299
3,150,000 | ​ | Insulet Corp.µ^ 0.375%, 09/01/26 | ​ | 3,870,720
765,000 | ​ | Invitae Corp.µ 2.000%, 09/01/24 | ​ | 1,171,873
156,000 | ​ | Jazz Investments I, Ltd.*µ 2.000%, 06/15/26 | ​ | 187,194
| ​ | NuVasive, Inc. | ​ | ​
165,000 | ​ | 0.375%, 03/15/25* | ​ | 141,582
85,000 | ​ | 2.250%, 03/15/21µ | ​ | 85,667
320,000 | ​ | Omnicell, Inc.*µ 0.250%, 09/15/25 | ​ | 352,896
| ​ | Pacira BioSciences, Inc. | ​ | ​
2,065,000 | ​ | 0.750%, 08/01/25* | ​ | 2,127,590
26,000 | ​ | 2.375%, 04/01/22 | ​ | 28,332
171,000 | ​ | Tabula Rasa HealthCare, Inc.*^ 1.750%, 02/15/26 | ​ | 150,256
203,000 | ​ | Teladoc Health, Inc.*^ 1.250%, 06/01/27 | ​ | 237,622
| ​ |  | ​ | 13,277,975
Industrials (2.8%)
4,680,000 | ​ | Air Canada* 4.000%, 07/01/25 | ​ | 5,121,137
2,000,000 | HKD | Harvest International Company 0.000%, 11/21/22 | ​ | 283,810
141,000 | ​ | Lyft, Inc.* 1.500%, 05/15/25 | ​ | 135,546
161,000 | ​ | Middleby Corp.*µ 1.000%, 09/01/25 | ​ | 166,196
3,897,000 | ​ | Southwest Airlines Companyµ 1.250%, 05/01/25 | ​ | 5,192,986
100,000 | EUR | Symrise, AGµ 0.238%, 06/20/24 | ​ | 145,254
2,400,000 | ​ | Vinci, SAµ 0.375%, 02/16/22 | ​ | 2,539,128
| ​ |  | ​ | 13,584,057

PRINCIPAL AMOUNT |  |  |  | VALUE
Information Technology (9.7%)
311,000 | ​ | 8x8, Inc. 0.500%, 02/01/24 | $ | 303,800
190,000 | ​ | Akamai Technologies, Inc.µ 0.125%, 05/01/25 | ​ | 222,710
| ​ | Alteryx, Inc. | ​ | ​
165,000 | ​ | 1.000%, 08/01/26 | ​ | 174,575
165,000 | ​ | 0.500%, 08/01/24^ | ​ | 173,405
141,000 | ​ | Cloudflare, Inc.* 0.750%, 05/15/25 | ​ | 223,602
5,050,000 | ​ | Coupa Software, Inc.*~ 0.375%, 06/15/26 | ​ | 5,912,692
162,000 | ​ | CyberArk Software, Ltd.* 0.000%, 11/15/24 | ​ | 156,205
146,000 | ​ | Datadog, Inc.* 0.125%, 06/15/25 | ​ | 184,525
142,000 | ​ | Five9, Inc.* 0.500%, 06/01/25 | ​ | 188,082
1,000,000 | ​ | Guidewire Software, Inc. 1.250%, 03/15/25 | ​ | 1,096,310
113,000 | ​ | II-VI, Inc. 0.250%, 09/01/22 | ​ | 135,497
136,000 | ​ | Inphi Corp.*^ 0.750%, 04/15/25 | ​ | 174,391
2,500,000 | ​ | j2 Global, Inc.~ 3.250%, 06/15/29 | ​ | 2,838,025
324,000 | ​ | Lumentum Holdings, Inc.*µ 0.500%, 12/15/26 | ​ | 365,417
241,000 | ​ | Microchip Technology, Inc. 1.625%, 02/15/27 | ​ | 379,245
186,000 | ​ | New Relic, Inc. 0.500%, 05/01/23 | ​ | 180,574
3,500,000 | EUR | Nexi S.p.A 1.750%, 04/24/27 | ​ | 4,605,946
162,000 | ​ | Nice, Ltd.* 0.000%, 09/15/25 | ​ | 165,878
241,000 | ​ | Okta, Inc.µ 0.125%, 09/01/25 | ​ | 316,390
1,874,000 | ​ | ON Semiconductor Corp.^ 1.625%, 10/15/23 | ​ | 2,682,781
| ​ | Palo Alto Networks, Inc.µ | ​ | ​
190,000 | ​ | 0.750%, 07/01/23 | ​ | 204,757
148,000 | ​ | 0.375%, 06/01/25* | ​ | 150,475
173,000 | ​ | Pegasystems, Inc.*µ^ 0.750%, 03/01/25 | ​ | 191,528
81,000 | ​ | Pluralsight, Inc. 0.375%, 03/01/24 | ​ | 71,477
165,000 | ​ | Proofpoint, Inc. 0.250%, 08/15/24 | ​ | 160,002
165,000 | ​ | Q2 Holdings, Inc.µ 0.750%, 06/01/26 | ​ | 203,686
5,085,000 | ​ | RingCentral, Inc.* 0.000%, 03/15/26 | ​ | 4,965,350

​

Schedule of Investments October 31, 2020

See accompanying Notes to Schedule of Investments | CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 33

PRINCIPAL AMOUNT |  |  |  | VALUE
68,000 | ​ | Shopify, Inc. 0.125%, 11/01/25 | $ | 73,828
145,000 | ​ | Silicon Laboratories, Inc.*µ 0.625%, 06/15/25 | ​ | 160,506
273,300 | EUR | Silicon On Insulator Tec Sr Unsecured Reg 0.000%, 10/01/25 | ​ | 559,983
250,000 | ​ | Slack Technologies, Inc.* 0.500%, 04/15/25 | ​ | 285,788
| ​ | Splunk, Inc. | ​ | ​
1,730,000 | ​ | 1.125%, 06/15/27* | ​ | 1,918,518
1,690,000 | ​ | 1.125%, 09/15/25µ | ​ | 2,515,481
1,500,000 | ​ | 0.500%, 09/15/23^ | ​ | 2,165,595
| ​ | Square, Inc.µ | ​ | ​
3,100,000 | ​ | 0.125%, 03/01/25* | ​ | 4,575,383
70,000 | ​ | 0.500%, 05/15/23 | ​ | 144,460
20,000 | ​ | Twilio, Inc.µ 0.250%, 06/01/23 | ​ | 78,469
2,530,000 | ​ | Wix.com, Ltd.*^ 0.000%, 08/15/25 | ​ | 2,501,866
385,000 | ​ | Workday, Inc.µ 0.250%, 10/01/22 | ​ | 582,266
170,000 | ​ | Workiva, Inc. 1.125%, 08/15/26 | ​ | 169,298
308,000 | ​ | Zendesk, Inc.*µ 0.625%, 06/15/25 | ​ | 385,804
2,971,000 | ​ | Zscaler, Inc.*µ 0.125%, 07/01/25 | ​ | 3,467,187
| ​ |  | ​ | 46,011,757
Materials (2.1%)
490,000,000 | JPY | Kansai Paint Company, Ltd.µ 0.000%, 06/17/22 | ​ | 4,921,623
3,360,000 | CHF | Sika, AGµ 0.150%, 06/05/25 | ​ | 4,760,248
10,000,000 | JPY | Teijin, Ltd. 0.000%, 12/10/21 | ​ | 97,629
| ​ |  | ​ | 9,779,500
Real Estate (2.1%)
200,000 | EUR | ANLLIAN Capital, Ltd. 0.000%, 02/05/25 | ​ | 235,008
3,760,000 | ​ | ESR Cayman, Ltd. 1.500%, 09/30/25 | ​ | 3,866,934
400,000 | EUR | Grand City Properties, SAµ 0.250%, 03/02/22 | ​ | 468,897
145,000 | ​ | IH Merger Sub, LLC 3.500%, 01/15/22 | ​ | 184,655
5,240,000 | ​ | Redfin Corp.* 0.000%, 10/15/25 | ​ | 4,966,158
20,000,000 | JPY | Relo Group, Inc.µ 0.000%, 03/22/21 | 189,940
| ​ |  | ​ | 9,911,592
| ​ | ​ | Total Convertible Bonds (Cost $150,450,471) | ​ | 161,919,083

PRINCIPAL AMOUNT |  |  |  | VALUE
Bank Loans (2.3%)¡
Communication Services (0.5%)
346,500 | ​ | Clear Channel Outdoor Holdings, Inc.‡ 3.714%, 08/21/26 3 mo. LIBOR + 3.50% | $ | 316,831
222,750 | ​ | CommScope, Inc.‡ 3.398%, 04/06/26 1 mo. LIBOR + 3.25% | ​ | 215,709
50,000 | ​ | Consolidated Communications, Inc.! 0.000%, 10/02/27 | ​ | 49,649
30,000 | ​ | Consolidated Communications, Inc.‡ 5.750%, 10/02/27 1 mo. LIBOR + 4.75% | ​ | 29,789
148,503 | ​ | CSC Holdings, LLC‡ 2.648%, 04/15/27 1 mo. LIBOR + 2.50% | ​ | 144,270
347,321 | ​ | Frontier Communications Corp.‡ 6.000%, 06/15/24 2 mo. PRIME + 2.75% | ​ | 342,369
50,000 | ​ | Frontier Communications Corp.‡ 5.750%, 10/01/27 3 mo. LIBOR + 4.75% | ​ | 49,656
263,013 | ​ | iHeartCommunications, Inc.‡ 3.148%, 05/01/26 1 mo. LIBOR + 3.00% | ​ | 247,654
631,800 | ​ | Intelsat Jackson Holdings, SA 8.625%, 01/02/24 | ​ | 637,679
290,000 | ​ | Intelsat Jackson Holdings, SA‡ 8.750%, 01/02/24 3 mo. PRIME + 5.50% | ​ | 292,578
125,000 | ​ | Intelsat Jackson Holdings, SA! 0.000%, 01/02/24 | ​ | 126,111
195,000 | ​ | Parexel International Corp.‡ 2.898%, 09/27/24 1 mo. LIBOR + 2.75% | ​ | 187,444
| ​ |  | ​ | 2,639,739
Consumer Discretionary (0.3%)
717,623 | ​ | PetSmart, Inc.‡ 4.500%, 03/11/22 3 mo. LIBOR + 3.50% | ​ | 711,696
325,567 | ​ | Staples, Inc.‡ 5.251%, 04/16/26 3 mo. LIBOR + 5.00% | ​ | 300,172
614,125 | ​ | Weight Watchers International, Inc.‡ 5.500%, 11/29/24 1 mo. LIBOR + 4.75% | ​ | 615,046
| ​ |  | ​ | 1,626,914
​
Energy (0.1%)
58,009 | ​ | Lealand Finance Company, BV‡ 4.145%, 06/30/25 1 mo. LIBOR + 4.00% | ​ | 37,223

​

Schedule of Investments October 31, 2020

34 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT | See accompanying Notes to Schedule of Investments

PRINCIPAL AMOUNT |  |  |  | VALUE
4,269 | ​ | McDermott Technology Americas, Inc.‡ 3.145%, 06/30/24 1 mo. LIBOR + 3.00% | $ | 3,522
285,757 | ​ | Par Pacific Holdings, Inc.‡ 6.980%, 01/12/26 3 mo. LIBOR + 6.75% | ​ | 240,036
| ​ |  | ​ | 280,781
Financials (0.1%)
368,150 | ​ | Connect Finco Sarl‡ 5.500%, 12/11/26 1 mo. LIBOR + 4.50% | ​ | 361,247
586,732 | EUR | Steenbok Lux Finco 2 Sarl‡ 0.000%, 12/31/21 6 mo. EURIBOR + 10.00% | ​ | 143,501
| ​ |  | ​ | 504,748
Health Care (0.6%)
708,520 | ​ | Amneal Pharmaceuticals, LLC‡ 3.688%, 05/04/25 1 mo. LIBOR + 3.50% | ​ | 678,110
456,462 | ​ | Endo International, PLC‡ 5.000%, 04/29/24 3 mo. LIBOR + 4.25% | ​ | 435,161
442,156 | ​ | Gentiva Health Services, Inc.‡ 3.438%, 07/02/25 1 mo. LIBOR + 3.25% | ​ | 433,866
323,990 | ​ | Mallinckrodt International Finance, SA‡ 5.500%, 09/24/24 3 mo. LIBOR + 4.75% | ​ | 299,954
409,633 | ​ | Ortho Clinical Diagnostics, SA‡ 3.390%, 06/30/25 1 mo. LIBOR + 3.25% | ​ | 396,705
608,056 | ​ | Team Health Holdings, Inc.‡ 3.750%, 02/06/24 1 mo. LIBOR + 2.75% | ​ | 498,320
| ​ |  | ​ | 2,742,116
Industrials (0.5%)
493,750 | ​ | Berry Global, Inc.‡ 2.147%, 07/01/26 1 mo. LIBOR + 2.00% | ​ | 478,757
329,940 | ​ | BW Gas & Convenience Holdings, LLC‡ 6.410%, 11/18/24 1 mo. LIBOR + 6.25% | ​ | 329,168
283,575 | ​ | Dun & Bradstreet Corp.‡ 3.906%, 02/06/26 1 mo. LIBOR + 3.75% | ​ | 279,793
207,900 | ​ | Granite US Holdings Corp.‡ 5.470%, 09/30/26 3 mo. LIBOR + 5.25% | ​ | 195,426
213,620 | ​ | Navistar International Corp.‡ 3.650%, 11/06/24 1 mo. LIBOR + 3.50% | ​ | 212,072

PRINCIPAL AMOUNT |  |  |  | VALUE
219,331 | ​ | RegionalCare Hospital Partners Holdings, Inc.‡ 3.898%, 11/16/25 1 mo. LIBOR + 3.75% | $ | 213,299
426,718 | ​ | Scientific Games International, Inc.‡ 2.898%, 08/14/24 1 mo. LIBOR + 2.75% | ​ | 398,081
68,949 | ​ | TransDigm, Inc.‡ 2.398%, 12/09/25 1 mo. LIBOR + 2.25% | ​ | 65,049
| ​ |  | ​ | 2,171,645
Information Technology (0.2%)
343,875 | ​ | BMC Software Finance, Inc.‡ 4.398%, 10/02/25 1 mo. LIBOR + 4.25% | ​ | 334,972
332,487 | ​ | Camelot U.S. Acquisition 1 Company‡ 3.148%, 10/30/26 1 mo. LIBOR + 3.00% | ​ | 324,451
155,000 | ​ | Camelot U.S. Acquisition 1 Company! 0.000%, 10/30/26 | ​ | 153,644
288,031 | ​ | VFH Parent, LLC‡ 3.145%, 03/01/26 1 mo. LIBOR + 3.00% | ​ | 285,242
| ​ |  | ​ | 1,098,309
Materials (0.0%)
199,000 | ​ | Innophos, Inc.‡ 3.648%, 02/07/27 1 mo. LIBOR + 3.50% | 196,015
| ​ | ​ | Total Bank Loans (Cost $11,894,801) | ​ | 11,260,267

NUMBER OF SHARES |  |  |  | VALUE
Convertible Preferred Stocks (14.2%)
Communication Services (2.0%)
8,895 | ​ | 2020 Cash Mandatory Exchangeable Trust* 5.250%, 06/01/23 | 9,302,827
Consumer Discretionary (1.6%)
62,300 | ​ | Aptiv, PLC 5.500%, 06/15/23 | 7,500,920
Consumer Staples (0.1%)
6,364 | ​ | Energizer Holdings, Inc. 7.500%, 01/15/22 | 542,404
Financials (1.8%)
5,000 | ​ | 2017 Mandatory Exchangeable Trust* 5.188%, 12/01/20 | ​ | 932,760
23,232 | ​ | Assurant, Inc. 6.500%, 03/15/21 | ​ | 2,803,870
417 | ​ | Bank of America Corp.‡‡ 7.250% | ​ | 611,697

​

Schedule of Investments October 31, 2020

See accompanying Notes to Schedule of Investments | CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 35

NUMBER OF SHARES |  |  |  | VALUE
70,678 | ​ | KKR & Company, Inc.µ 6.000%, 09/15/23 | $ | 3,678,083
413 | ​ | Wells Fargo & Company‡‡ 7.500% | ​ | 557,038
| ​ |  | ​ | 8,583,448
| ​ | ​ | ​ | ​
Health Care (2.4%)
33,200 | ​ | Boston Scientific Corp.µ 5.500%, 06/01/23 | ​ | 3,438,856
5,108 | ​ | Danaher Corp. 4.750%, 04/15/22 | ​ | 8,018,998
| ​ |  | ​ | 11,457,854
Industrials (1.4%)
10,000 | ​ | Colfax Corp. 5.750%, 01/15/22 | ​ | 1,181,700
1,500 | ​ | Fortive Corp. 5.000%, 07/01/21 | ​ | 1,386,495
40,433 | ​ | Stanley Black & Decker, Inc.µ 5.250%, 11/15/22 | ​ | 4,220,396
| ​ |  | ​ | 6,788,591
Information Technology (1.5%)
5,931 | ​ | Broadcom, Inc. 8.000%, 09/30/22 | 7,057,831
Materials (0.2%)
22,059 | ​ | International Flavors & Fragrances, Inc.µ 6.000%, 09/15/21 | 852,360
Utilities (3.2%)
| ​ | American Electric Power Company, Inc.µ | ​ | ​
50,341 | ​ | 6.125%, 03/15/22^ | ​ | 2,687,706
20,000 | ​ | 6.125%, 08/15/23 | ​ | 1,070,800
20,000 | ​ | CenterPoint Energy, Inc. 7.000%, 09/01/21 | ​ | 795,400
3,250 | ​ | DTE Energy Company 6.250%, 11/01/22 | ​ | 154,635
10,653 | ​ | Essential Utilities, Inc. 6.000%, 04/30/22 | ​ | 580,375
| ​ | NextEra Energy, Inc.µ | ​ | ​
115,413 | ​ | 4.872%, 09/01/22 | ​ | 6,578,541
4,936 | ​ | 6.219%, 09/01/23 | ​ | 243,493
| ​ | Sempra Energyµ | ​ | ​
16,130 | ​ | 6.750%, 07/15/21 | ​ | 1,646,712
13,066 | ​ | 6.000%, 01/15/21 | ​ | 1,336,782
11,765 | ​ | South Jersey Industries, Inc.µ 7.250%, 04/15/21 | 390,716
| ​ |  | ​ | 15,485,160
| ​ | ​ | Total Convertible Preferred Stocks (Cost $64,674,045) | ​ | 67,571,395

NUMBER OF SHARES |  |  |  | VALUE
Common Stocks (70.1%)
Communication Services (4.4%)
86,500 | ​ | America Movil, SAB de CV - Class L | $ | 1,031,080
2,082 | ​ | Cumulus Media, Inc. - Class A# | ​ | 10,535
96,000 | EUR | Orange, SA | ​ | 1,078,044
134,750 | ​ | Tencent Holdings, Ltd. | ​ | 10,286,815
1,176,545 | GBP | Vodafone Group, PLC | ​ | 1,569,473
56,345 | ​ | Walt Disney Company~ | ​ | 6,831,831
| ​ |  | ​ | 20,807,778
| ​ | ​ | ​ | ​
Consumer Discretionary (11.4%)
36,396 | ​ | Alibaba Group Holding, Ltd.# | ​ | 11,089,497
146,200 | GBP | Compass Group, PLC | ​ | 2,001,147
64,400 | ​ | D.R. Horton, Inc. | ​ | 4,302,564
78,600 | EUR | Daimler, AG | ​ | 4,062,715
100,000 | ​ | Ford Motor Company~ | ​ | 773,000
6,800 | KRW | Hyundai Motor Company | ​ | 995,357
21,175 | ​ | Lowe’s Companies, Inc. | ​ | 3,347,767
26,685 | ​ | Lululemon Athletica, Inc.~# | ​ | 8,520,254
22,000 | ​ | McDonald’s Corp. | ​ | 4,686,000
17,525 | ​ | Newell Brands, Inc.^~ | ​ | 309,492
10,800 | ​ | Pool Corp. | ​ | 3,778,164
9,000 | EUR | Porsche Automobil Holding, SE Preferenced Shares | ​ | 482,151
52,800 | ​ | PulteGroup, Inc. | ​ | 2,152,128
10,080 | ​ | Tesla, Inc. | ​ | 3,911,443
9,850 | ​ | Tesla, Inc.# | ​ | 3,822,194
| ​ |  | ​ | 54,233,873
Consumer Staples (4.6%)
96,675 | ​ | Coca-Cola Company^ | ​ | 4,646,200
9,800 | ​ | Costco Wholesale Corp. | ​ | 3,504,676
49,900 | EUR | Danone, SA | ​ | 2,767,713
127,600 | JPY | Kobe Bussan Company, Ltd.^ | ​ | 3,590,031
49,000 | CHF | Nestlé, SA | ​ | 5,511,417
25,500 | ​ | Philip Morris International, Inc.^ | ​ | 1,811,010
| ​ |  | ​ | 21,831,047
Energy (5.4%)
790,950 | GBP | BP, PLC | ​ | 2,017,463
19,150 | ​ | Chevron Corp.~ | ​ | 1,330,925
40,000 | ​ | ConocoPhillips | ​ | 1,144,800
15,158 | ​ | Denbury, Inc.# | ​ | 251,471
23,500 | ​ | Devon Energy Corp.~ | ​ | 209,855
16,800 | ​ | Energy Transfer, LP | ​ | 86,520
20,110 | ​ | Enterprise Products Partners, LP | ​ | 333,223
1,826 | ​ | EP Energy Corp.# | ​ | 33,781
62,500 | ​ | Exxon Mobil Corp.~ | ​ | 2,038,750
3,975 | ​ | GasLog, Ltd. | ​ | 9,460
5,080 | ​ | Magellan Midstream Partners, LP | ​ | 180,543
45,000 | ​ | Marathon Petroleum Corp. | ​ | 1,327,500

​

Schedule of Investments October 31, 2020

36 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT | See accompanying Notes to Schedule of Investments

NUMBER OF SHARES |  |  |  | VALUE
31,611 | ​ | Mcdermott International, Ltd.^# | $ | 53,739
87,725 | EUR | Neste Oyj | ​ | 4,575,170
299,450 | INR | Reliance Industries, Ltd. | ​ | 8,341,984
93,075 | EUR | Royal Dutch Shell, PLC - Class A | ​ | 1,186,222
82,300 | GBP | Royal Dutch Shell, PLC - Class A | ​ | 1,035,291
98,974 | ​ | Schlumberger, Ltd.~ | ​ | 1,478,672
7,380 | ​ | Targa Resources Corp. | ​ | 118,449
10,682 | ​ | Tidewater, Inc.^# | ​ | 62,596
4,287 | ​ | Weatherford International, PLC^# | ​ | 8,960
4,047 | ​ | Whiting Petroleum Corp.# | ​ | 59,086
2,500 | ​ | Williams Companies, Inc. | ​ | 47,975
| ​ |  | ​ | 25,932,435
Financials (9.0%)
141,400 | ​ | American International Group, Inc.~ | ​ | 4,452,686
327,200 | ​ | Bank of America Corp.~ | ​ | 7,754,640
26,735 | ​ | Goldman Sachs Group, Inc.~ | ​ | 5,053,985
425,400 | INR | HDFC Bank, Ltd.# | ​ | 6,787,010
201,700 | ​ | Itau Unibanco Holding, SA | ​ | 824,953
80,550 | ​ | JPMorgan Chase & Company^~ | ​ | 7,897,122
334,000 | HKD | Ping An Insurance Group Company of China, Ltd. - Class H | ​ | 3,453,451
102,900 | CAD | Power Corp. of Canada | ​ | 1,959,448
165,825 | GBP | Prudential, PLC | ​ | 2,028,122
129,125 | ​ | Wells Fargo & Company~ | ​ | 2,769,731
| ​ |  | ​ | 42,981,148
Health Care (6.1%)
139,781 | ​ | Alcon, Inc.^# | ​ | 7,945,152
27,434 | EUR | Bayer, AG | ​ | 1,289,138
1,885 | ​ | Biogen, Inc.# | ​ | 475,152
40,200 | AUD | CSL, Ltd. | ​ | 8,138,782
15,700 | ​ | Eli Lilly and Company | ​ | 2,048,222
140,000 | ​ | Novo Nordisk, A/S^ | ​ | 8,944,600
| ​ |  | ​ | 28,841,046
Industrials (7.8%)
40,589 | EUR | Alstom, SA# | ​ | 1,813,492
57,025 | SEK | Atlas Copco, AB - Class A | ​ | 2,517,149
13,825 | ​ | Boeing Company | ​ | 1,996,192
23,700 | ​ | Caterpillar, Inc. | ​ | 3,722,085
16,300 | ​ | Cummins, Inc. | ​ | 3,584,207
63,400 | GBP | Experian, PLC | ​ | 2,322,588
27,200 | JPY | FANUC Corp. | ​ | 5,745,311
242,500 | ​ | General Electric Company | ​ | 1,799,350
44,300 | JPY | Harmonic Drive Systems, Inc.^ | ​ | 2,934,322
4,300 | ​ | Lockheed Martin Corp. | ​ | 1,505,559
33,500 | EUR | Schneider Electric, SE | ​ | 4,070,465
10,300 | ​ | Union Pacific Corp. | ​ | 1,825,057
21,900 | ​ | United Parcel Service, Inc. - Class B | ​ | 3,440,709
1,302 | ​ | Wabtec Corp. | ​ | 77,209
| ​ |  | ​ | 37,353,695

NUMBER OF SHARES |  |  |  | VALUE
Information Technology (15.9%)
40,300 | ​ | Advanced Micro Devices, Inc.# | $ | 3,034,187
3,285 | EUR | Adyen, NV*# | ​ | 5,521,241
71,800 | ​ | Apple, Inc.^ | ​ | 7,816,148
16,015 | ​ | ASML Holding, NV | ​ | 5,784,778
60,000 | JPY | Canon, Inc. | ​ | 1,044,372
25,600 | JPY | Fujitsu, Ltd. | ​ | 3,028,853
25,100 | JPY | Keyence Corp. | ​ | 11,390,945
39,500 | ​ | Micron Technology, Inc.# | ​ | 1,988,430
46,605 | ​ | Microsoft Corp.~ | ​ | 9,436,114
61,300 | JPY | NEC Corp. | ​ | 3,087,691
580,000 | EUR | Nokia Corp.# | ​ | 1,955,294
4,800 | ​ | NVIDIA Corp. | ​ | 2,406,528
58,950 | KRW | Samsung Electronics Company, Ltd. | ​ | 2,963,158
70,000 | TWD | Taiwan Semiconductor Manufacturing Company, Ltd. | ​ | 1,059,077
179,925 | ​ | Taiwan Semiconductor Manufacturing Company, Ltd. (ADR)~ | ​ | 15,090,310
| ​ |  | ​ | 75,607,126
Materials (4.6%)
154,000 | CAD | Barrick Gold Corp. | ​ | 4,117,301
617,700 | ​ | Cemex, SAB de CV | ​ | 2,563,455
85,200 | EUR | CRH, PLC | ​ | 2,981,299
160,000 | AUD | Newcrest Mining, Ltd. | ​ | 3,317,998
30,000 | GBP | Rio Tinto, PLC | ​ | 1,696,841
1,338,900 | CAD | Yamana Gold, Inc. | ​ | 7,446,708
| ​ |  | ​ | 22,123,602
Utilities (0.9%)
45,801 | EUR | Engie, SA# | ​ | 553,958
10,500 | ​ | Exelon Corp. | ​ | 418,845
185,500 | EUR | Iberdrola, SA | ​ | 2,190,305
29,000 | EUR | RWE, AG | 1,073,225
| ​ |  | ​ | 4,236,333
| ​ | ​ | Total Common Stocks (Cost $433,145,989) | ​ | 333,948,083
Warrants (0.0%) #
Energy (0.0%)
1,446 | ​ | Denbury, Inc. 09/18/25, Strike $32.59 | 4,880
534 | ​ | Denbury, Inc. 09/18/23, Strike $35.41 | 1,001
13,401 | ​ | Mcdermott International, Ltd. 05/01/24, Strike $15.98 | 2
12,061 | ​ | Mcdermott International, Ltd. 05/01/24, Strike $12.33 | ​ | 1
| ​ | ​ | ​ | Total Warrants (Cost $84,971) | ​ | 5,884

​

Schedule of Investments October 31, 2020

See accompanying Notes to Schedule of Investments | CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 37

NUMBER OF SHARES |  |  |  | VALUE
Preferred Stocks (0.2%)
Communication Services (0.1%)
9,750 | ​ | United States Cellular Corp. 6.250%, 09/01/69 | $256,328​
Energy (0.1%)
16,785 | ​ | NuStar Energy, LP‡ 7.625%, 06/15/22 3 mo. USD LIBOR + 5.64% | ​ | 277,792
10,625 | ​ | NuStar Energy, LP‡ 8.500%, 12/15/21 3 mo. USD LIBOR + 6.77% | ​ | 199,006
11,500 | ​ | NuStar Logistics, LP‡ 6.971%, 01/15/43 3 mo. USD LIBOR + 6.73% | 215,510
| ​ |  | ​ | 692,308
| ​ | ​ | Total Preferred Stocks (Cost $1,245,293) | ​ | 948,636

NUMBER OF CONTRACTS/ NOTIONAL AMOUNT |  |  | VALUE
Purchased Options (3.2%) #
Communication Services (0.7%)
73 11,797,603 | ​ | Alphabet, Inc. Call, 01/21/22, Strike $1,500.00 | ​ | 2,215,550
300 7,893,300 | ​ | Facebook, Inc. Call, 06/18/21, Strike $250.00 | ​ | 1,299,750
| ​ |  | 3,515,300
Consumer Discretionary (1.1%)
105 31,879,575 | ​ | Amazon.com, Inc. Call, 01/21/22, Strike $3,200.00 | 5,113,500
Industrials (0.2%)
445 5,417,430 | ​ | J.B. Hunt Transport Services, Inc. Call, 02/19/21, Strike $135.00 | ​ | 137,950
1,515 9,185,445 | ​ | Ritchie Bros Auctioneers, Inc. Call, 03/19/21, Strike $65.00 | ​ | 537,825
| ​ |  | 675,775
Information Technology (0.3%)
29 2,683,747 | ​ | Shopify, Inc. Call, 01/21/22, Strike $920.00 | ​ | 650,180
391 7,104,861 | ​ | Visa, Inc. Call, 01/21/22, Strike $195.00 | ​ | 741,922
| ​ |  | 1,392,102
Other (0.9%)
| ​ | Invesco QQQ Trust Series | ​ | ​
1,445 38,925,410 | ​ | Put, 11/20/20, Strike $232.00 | ​ | 224,698
1,445 38,925,410 | ​ | Put, 01/15/21, Strike $232.00 | ​ | 874,947

NUMBER OF CONTRACTS/ NOTIONAL AMOUNT |  |  | VALUE
825 22,223,850 | ​ | Put, 11/20/20, Strike $262.00 | $ | 596,887
2,500 14,560,000 | ​ | iShares MSCI Japan ETF Call, 01/21/22, Strike $61.00 | ​ | 806,250
| ​ | iShares MSCI United Kingdom ETF | ​ | ​
4,705 11,451,970 | ​ | Call, 01/15/21, Strike $26.00 | ​ | 176,438
4,705 11,451,970 | ​ | Call, 04/16/21, Strike $28.00 | ​ | 117,625
| ​ | SPDR S&P 500 ETF Trust | ​ | ​
1,160 37,878,640 | ​ | Put, 11/20/20, Strike $289.00 | ​ | 273,180
1,160 37,878,640 | ​ | Put, 01/15/21, Strike $289.00 | ​ | 910,600
690 22,531,260 | ​ | Put, 11/20/20, Strike $312.00 | ​ | 431,940
| ​ |  | 4,412,565
| ​ | Total Purchased Options (Cost $19,604,520) | 15,109,242

NUMBER OF SHARES |  |  |  | VALUE
Short Term Investments (1.9%)
4,456,197 | ​ | JPMorgan Prime Money Market Fund - Capital Class, 0.070%*** | ​ | 4,458,871
4,458,649 | ​ | Morgan Stanley Institutional Liquidity Funds - Government Portfolio, 0.020%*** | 4,458,649
| ​ | ​ | Total Short Term Investments (Cost $8,917,520) | 8,917,520
| TOTAL INVESTMENTS (145.5%) (Cost $787,745,627) | 693,143,628​

MANDATORY REDEEMABLE PREFERRED SHARES, AT LIQUIDATION VALUE (-13.6%) | (65,000,000)
| ​
LIABILITIES, LESS OTHER ASSETS (-31.9%) | (151,610,665)
| ​
NET ASSETS (100.0%) | $476,532,963​

NUMBER OF SHARES |  |  |  |  | VALUE
Common Stocks Sold Short (-4.4%) #
Communication Services (-0.2%)
(23,474) | ​ | New York Times Company - Class A | ​ | (930,979)
Consumer Discretionary (-0.8%)
(10,080 | ) | Tesla, Inc. | ​ | (3,911,443)
Consumer Staples (-0.1%)
(10,826) | ​ | Energizer Holdings, Inc. | ​ | (426,003)

​

Schedule of Investments October 31, 2020

38 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT | See accompanying Notes to Schedule of Investments

NUMBER OF SHARES |  |  |  |  | VALUE
Financials (-0.6%)
(18,315) | ​ | Assurant, Inc. | $ | (2,277,837)
(34,000) | ​ | Equitable Holdings, Inc. | ​ | (730,660)
| ​ |  | ​ | (3,008,497)
Industrials (-0.5%)
(39,320) | ​ | Colfax Corp. | ​ | (1,069,111)
(17,011) | ​ | Fortive Corp. | ​ | (1,047,877)
| ​ |  | ​ | (2,116,988)
Information Technology (-1.1%)
(4,675) | ​ | Guidewire Software, Inc. | ​ | (449,314)
(23,500) | ​ | j2 Global, Inc. | ​ | (1,595,180)
(15,800) | ​ | Splunk, Inc. | ​ | (3,129,032)
| ​ |  | ​ | (5,173,526)
Materials (-0.1%)
(6,452) | ​ | International Flavors & Fragrances, Inc. | ​ | (662,362)
Utilities (-1.0%)
(9,000) | ​ | American Electric Power Company, Inc. | ​ | (809,370)
(28,700) | ​ | CenterPoint Energy, Inc. | ​ | (606,431)
(6,614) | ​ | Essential Utilities, Inc. | ​ | (272,497)
(12,120) | ​ | NextEra Energy, Inc. | ​ | (887,305)
(16,032) | ​ | Sempra Energy | ​ | (2,009,772)
(15,294) | ​ | South Jersey Industries, Inc. | ​ | (294,715)
| ​ |  | ​ | (4,880,090)
| ​ | ​ | Total Common Stocks Sold Short (Proceeds $(16,718,452)) | ​ | ​ | (21,109,888)

NOTES TO SCHEDULE OF INVESTMENTS

*Securities issued and sold pursuant to a Rule 144A transaction are excepted from the registration requirement of the Securities Act of 1933, as amended. These securities may only be sold to qualified institutional buyers (“QIBs”), such as the Fund. Any resale of these securities must generally be effected through a sale that is registered under the Act or otherwise exempted from such registration requirements.

µ Security, or portion of security, is held in a segregated account as collateral for note payable aggregating a total value of $96,244,117.

^Security, or portion of security, is on loan.

@In default status and considered non-income producing.

‡Variable rate security. The rate shown is the rate in effect at Oct ober 31, 2020.

&Illiquid security.

~Security, or portion of security, is segregated as collateral (or collateral for potential future transactions) for written options, swaps, or securities sold short. The aggregate value of such securities is $24,085,199.

¡Bank loans generally are subject to mandatory and/or optional prepayment. As a result, the actual remaining maturity of bank loans m ay b e substantially less than the stated maturities shown.

!This position represents an unsettled loan commitment at period end. Certain details associated with this purchase are not known prior to the settlement date, including coupon rate, which will be adjusted on settlement date.

‡‡Perpetual maturity.

#Non-income producing security.

***The rate disclosed is the 7 day net yield as of October 31, 2020.

FOREIGN CURRENCY ABBREVIATIONS

AUD Australian Dollar

CAD Canadian Dollar

CHF Swiss Franc

EUR European Monetary Unit

GBP British Pound Sterling

HKD Hong Kong Dollar

INR Indian Rupee

JPY Japanese Yen

KRW South Korean Won

SEK Swedish Krona

TWD New Taiwan Dollar

Note: Value for securities denominated in foreign currencies is shown in U.S. dollars. The principal amount for such securities is shown in the respective foreign currency. The date on options represents the expiration date of the option contract. The option contract may be exercised at any date on or before the date shown.

CURRENCY EXPOSURE OCTOBER 31, 2020

| Value |  | % of Total Investments
US Dollar | $ | 510,033,104 | ​ | 75.9 | %
European Monetary Unit | ​ | 48,798,223 | ​ | 7.3 | %
Japanese Yen | ​ | 36,792,878 | ​ | 5.5 | %
Canadian Dollar | ​ | 15,191,235 | ​ | 2.3 | %
Indian Rupee | ​ | 15,128,994 | ​ | 2.2 | %
British Pound Sterling | ​ | 12,812,992 | ​ | 1.9 | %
Australian Dollar | ​ | 11,456,780 | ​ | 1.7 | %
Swiss Franc | ​ | 10,271,665 | ​ | 1.5 | %
Hong Kong Dollar | ​ | 4,013,128 | ​ | 0.6 | %
South Korean Won | ​ | 3,958,515 | ​ | 0.6 | %
Swedish Krona | ​ | 2,517,149 | ​ | 0.4 | %
New Taiwan Dollar | ​ | 1,059,077 | ​ | 0.1 | %
Total Investments Net of Common Stocks Sold Short | $ | 672,033,740 | ​ | 100.0 | %

Currency exposure may vary over time.

​

See accompanying Notes to Financial Statements | CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 39

Statement of Assets and Liabilities October 31, 2020

ASSETS | ​ | ​
Investments in securities, at value (cost $787,745,627) | $ | 693,143,628 | ​
Cash with custodian | ​ | 480,984 | ​
Restricted cash for short positions | ​ | 22,246,649 | ​
Restricted foreign currency for short positions (cost $3) | ​ | 3 | ​
Foreign currency (cost $29,395) | ​ | 29,378 | ​
Receivables: | ​ | ​ | ​ | ​ | ​
Accrued interest and dividends | ​ | 3,193,539 | ​
Investments sold | ​ | 1,592,574 | ​
Prepaid expenses | ​ | 222,248 | ​
Other assets | ​ | 74,149 | ​
Total assets | ​ | 720,983,152 | ​
| ​ | ​ | ​ | ​ | ​
LIABILITIES | ​ | ​
Securities sold short, at value (proceeds $16,718,452) | ​ | 21,109,888 | ​
Mandatory Redeemable Preferred Shares ($25 liquidation value per share applicable to 2,600,000 shares authorized, issued, and outstanding) (net of deferred offering costs of $384,041) (Note 8) | ​ | 64,615,959 | ​
Payables: | ​ | ​ | ​ | ​ | ​
Notes payable | ​ | 153,250,000 | ​
Distributions payable to Mandatory Redeemable Preferred Shareholders | ​ | 215,692 | ​
Investments purchased | ​ | 4,185,293 | ​
Affiliates: | ​ | ​ | ​ | ​ | ​
Investment advisory fees | ​ | 611,087 | ​
Deferred compensation to trustees | ​ | 74,365 | ​
Trustees’ fees and officer compensation | ​ | 3,442 | ​
Other accounts payable and accrued liabilities | ​ | 384,463 | ​
Total liabilities | ​ | 244,450,189 | ​
NET ASSETS | $ | 476,532,963 | ​
| ​ | ​ | ​ | ​ | ​
COMPOSITION OF NET ASSETS | ​ | ​
Common stock, no par value, unlimited shares authorized 59,367,858 shares issued and outstanding | $ | 574,563,688 | ​
Undistributed net investment income (loss) | ​ | (993,890 | )
Accumulated net realized gain (loss) on investments, foreign currency transactions, written options and short positions | ​ | 2,123,987 | ​
Unrealized appreciation (depreciation) of investments, foreign currency translations, written options and short positions | ​ | (99,160,822 | )*
NET ASSETS | $ | 476,532,963 | ​
Net asset value per common shares based upon 59,367,858 shares issued and outstanding | $ | 8.03 | ​

*Net of deferred foreign capital gains tax of $(187,767).

​

Statement of Operations Year Ended October 31, 2020

40 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT | See accompanying Notes to Financial Statements

INVESTMENT INCOME
Interest | $ | 11,561,402 | ​
Dividends | ​ | 9,991,693 | ​
Foreign Taxes Withheld | ​ | (380,441 | )
Total investment income | ​ | 21,172,654 | ​
| ​ | ​ | ​ | ​
EXPENSES
Investment advisory fees | ​ | 6,725,057 | ​
Interest expense and amortization of offering costs on Mandatory Redeemable Preferred Shares (Notes 1 and 8) | ​ | 2,763,843 | ​
Interest expense on Notes Payable (Note 7) | ​ | 1,997,819 | ​
Dividend or interest expense on short positions | ​ | 283,000 | ​
Printing and mailing fees | ​ | 80,666 | ​
Legal fees | ​ | 73,189 | ​
Custodian fees | ​ | 71,937 | ​
Accounting fees | ​ | 66,532 | ​
Fund administration fees | ​ | 53,692 | ​
Trustees’ fees and officer compensation | ​ | 41,884 | ​
Audit fees | ​ | 37,033 | ​
Transfer agent fees | ​ | 33,846 | ​
Registration fees | ​ | 15,525 | ​
Other | ​ | 171,909 | ​
Total expenses | ​ | 12,415,932 | ​
NET INVESTMENT INCOME (LOSS) | ​ | 8,756,722 | ​
| ​ | ​ | ​ | ​
REALIZED AND UNREALIZED GAIN (LOSS)
Net realized gain (loss) from:
Investments, excluding purchased options | ​ | 45,736,058 | (a)
Purchased options | ​ | 4,156,699 | ​
Foreign currency transactions | ​ | 206,617 | ​
Forward foreign currency contracts | ​ | 281 | ​
Written options | ​ | (1,284,912 | )
Short positions | ​ | (10,785,976 | )
Change in net unrealized appreciation/(depreciation) on:
Investments, excluding purchased options | ​ | 12,520,002 | (b)
Purchased options | ​ | (1,257,099 | )
Foreign currency translations | ​ | 25,833 | ​
Written options | ​ | 133,547 | ​
Short positions | ​ | (905,143 | )
NET GAIN (LOSS) | ​ | 48,545,907 | ​
NET INCREASE (DECREASE) IN NET ASSETS RESULTING FROM OPERATIONS | $ | 57,302,629 | ​

(a)Net of foreign capital gains tax of $167,876.

(b)Net of change of $(77,856) in deferred capital gains tax.

​

Statements of Changes in Net Assets

See accompanying Notes to Financial Statements | CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 41

| Year Ended October 31, 2020 |  | Year Ended October 31, 2019 | ​
| ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
OPERATIONS | ​ | ​ | ​ | ​ | ​ | ​
Net investment income (loss) | $ | 8,756,722 | ​ | $ | 9,949,469 | ​
Net realized gain (loss) | ​ | 38,028,767 | ​ | ​ | 15,056,333 | ​
Change in unrealized appreciation/(depreciation) | ​ | 10,517,140 | ​ | ​ | 20,038,907 | ​
Net increase (decrease) in net assets applicable to common shareholders resulting from operations | ​ | 57,302,629 | ​ | ​ | 45,044,709 | ​
| ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
DISTRIBUTIONS TO COMMON SHAREHOLDERS | ​ | ​ | ​ | ​ | ​ | ​
Total distributions | ​ | (49,839,414 | ) | ​ | (49,718,840 | )
Net decrease in net assets from distributions to common shareholders | ​ | (49,839,414 | ) | ​ | (49,718,840 | )
| ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
CAPITAL STOCK TRANSACTIONS | ​ | ​ | ​ | ​ | ​ | ​
Reinvestment of distributions resulting in the issuance of stock | ​ | 884,059 | ​ | ​ | 906,818 | ​
Net increase (decrease) in net assets from capital stock transactions | ​ | 884,059 | ​ | ​ | 906,818 | ​
TOTAL INCREASE (DECREASE) IN NET ASSETS | ​ | 8,347,274 | ​ | ​ | (3,767,313 | )
| ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
NET ASSETS | ​ | ​ | ​ | ​ | ​ | ​
Beginning of year | $ | 468,185,689 | ​ | $ | 471,953,002 | ​
End of year | $ | 476,532,963 | ​ | $ | 468,185,689 | ​

​

Statements of Cash Flows

42 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT | See accompanying Notes to Financial Statements

| Year Ended October 31, 2020 |  | Year Ended October 31, 2019 | ​
| ​ | ​ | ​ | ​ | ​ | ​ | ​
CASH FLOWS FROM OPERATING ACTIVITIES: | ​ | ​ | ​ | ​
Net increase/(decrease) in net assets from operations | $ | 57,302,629 | ​ | $ | 45,044,709 | ​
Adjustments to reconcile net increase/(decrease) in net assets from operations to net cash provided by operating activities: | ​ | ​ | ​ | ​
Purchase of investment securities, including purchased options | ​ | (896,586,146 | ) | ​ | (544,027,990 | )
Net proceeds from disposition of short term investments | ​ | (3,027,586 | ) | ​ | 18,637,863 | ​
Purchases of securities to cover securities sold short | ​ | (30,028,458 | ) | ​ | (16,952,765 | )
Proceeds paid on closing written options | ​ | (15,749,603 | ) | ​ | (1,028,917 | )
Proceeds from disposition of investment securities, including purchased options | ​ | 974,034,494 | ​ | ​ | 598,673,757 | ​
Proceeds from securities sold short | ​ | 12,398,923 | ​ | ​ | 14,289,184 | ​
Premiums received from written options | ​ | 13,787,603 | ​ | ​ | 3,365,995 | ​
Amortization and accretion of fixed-income securities | ​ | (2,361,084 | ) | ​ | (3,909,899 | )
Amortization of offering costs on Mandatory Redeemable Preferred Shares | ​ | 175,542 | ​ | ​ | 168,649 | ​
Net realized gains/losses from investments, excluding purchased options | ​ | (45,914,440 | ) | ​ | (20,656,714 | )
Net realized gains/losses from capital gains tax | ​ | 167,876 | ​ | ​ | — | ​
Net realized gains/losses from purchased options | ​ | (4,156,699 | ) | ​ | 4,674,126 | ​
Net realized gains/losses from short positions | ​ | 10,785,976 | ​ | ​ | 2,465,022 | ​
Net realized gains/losses from written options | ​ | 1,284,912 | ​ | ​ | (1,680,465 | )
Change in unrealized appreciation or depreciation on investments, excluding purchased options | ​ | (12,520,002 | ) | ​ | (23,319,860 | )
Change in unrealized appreciation or depreciation on capital gains tax | ​ | (77,856 | ) | ​ | (109,911 | )
Change in unrealized appreciation or depreciation on purchased options | ​ | 1,257,099 | ​ | ​ | 996,698 | ​
Change in unrealized appreciation or depreciation on short positions | ​ | 905,143 | ​ | ​ | 2,167,418 | ​
Change in unrealized appreciation or depreciation on written options | ​ | (133,547 | ) | ​ | 135,713 | ​
Net change in assets and liabilities: | ​ | ​ | ​ | ​
(Increase)/decrease in assets: | ​ | ​ | ​ | ​
Accrued interest and dividends receivable | ​ | 532,089 | ​ | ​ | 342,247 | ​
Prepaid expenses | ​ | 36,509 | ​ | ​ | 41,218 | ​
Other assets | ​ | 18,376 | ​ | ​ | 16,565 | ​
Increase/(decrease) in liabilities: | ​ | ​ | ​ | ​
Payables to affiliates | ​ | 2,053 | ​ | ​ | (79,257 | )
Other accounts payable and accrued liabilities | ​ | (270,776 | ) | ​ | 89,944 | ​
Net cash provided by/(used in) operating activities | $ | 61,863,027 | ​ | $ | 79,343,330 | ​
| ​ | ​ | ​ | ​ | ​ | ​ | ​
CASH FLOWS FROM FINANCING ACTIVITIES: | ​ | ​ | ​ | ​
Distributions to shareholders | ​ | (48,955,355 | ) | ​ | (48,812,022 | )
(Decrease)/Increase in Distributions to Mandatory Redeemable Preferred Shareholders | ​ | — | ​ | ​ | 13,915 | ​
Offering costs on Mandatory Redeemable Preferred Shares | ​ | (69,444 | ) | ​ | (65,582 | )
Net increase/(decrease) in due to custodian bank | ​ | (772,176 | ) | ​ | 772,176 | ​
Repayment of note payable | ​ | (21,250,000 | ) | ​ | (29,500,000 | )
Net cash provided by/(used in) financing activities | $ | (71,046,975 | ) | $ | (77,591,513 | )
Net increase/(decrease) in cash and foreign currency* | $ | (9,183,948 | ) | $ | 1,751,817 | ​
Cash and foreign currency and restricted cash at beginning of year | $ | 31,940,962 | ​ | $ | 30,189,145 | ​
Cash and foreign currency at end of year | $ | 22,757,014 | ​ | $ | 31,940,962 | ​
Supplemental disclosure | ​ | ​ | ​ | ​
Cash paid for interest on Notes Payable | $ | 2,330,901 | ​ | $ | 5,195,935 | ​
Cash paid for interest expense on Mandatory Redeemable Preferred Shares | $ | 2,763,843 | ​ | $ | 2,756,948 | ​
Non-cash financing activities not included herein consists of reinvestment of dividends and distributions | $ | 884,059 | ​ | $ | 906,818 | ​
| ​ | ​ | ​ | ​ | ​ | ​ | ​
The following table provides a reconciliation of cash and restricted cash reported within the Statement of Assets and Liabilities that sum to the total of the same such amounts shown in the Statements of Cash Flows. | ​
| ​ | ​ | ​ | ​
Cash with custodian | ​ | 510,362 | ​ | ​ | 4,719,900 | ​
Restricted cash for swap collateral | ​ | — | ​ | ​ | — | ​
Restricted cash for short positions | ​ | 22,246,649 | ​ | ​ | 27,221,062 | ​
Restricted foreign cash for short positions | ​ | 3 | ​ | ​ | — | ​
Total cash and restricted cash at period end | $ | 22,757,014 | ​ | $ | 31,940,962 | ​

*Includes net change in unrealized appreciation or depreciation on foreign currency of $(21).

​

Notes to Financial Statements

CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 43

Note 1 – Organization and Significant Accounting Policies

Organization. Calamos Global Dynamic Income Fund (the “Fund”) was organized as a Delaware statutory trust on April 10, 2007 and is registered under the Investment Company Act of 1940 (the “1940 Act”) as a diversified, closed-end management investment company. The Fund commenced operations on June 27, 2007.

Significant Accounting Policies. The financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (U.S. GAAP), and the Fund is considered an investment company under U.S. GAAP and follows the accounting and reporting guidance applicable to investment companies. Under U.S. GAAP, management is required to make certain estimates and assumptions at the date of the financial statements and actual results may differ from those estimates. Subsequent events, if any, through the date that the financial statements were issued, have been evaluated in the preparation of the financial statements. The following summarizes the significant accounting policies of the Fund:

In March 2017, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2017-08, Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities (“ASU 2017-08”). ASU 2017-08 shortens the amortization period for certain callable debt securities held at a premium. The Fund adopted ASU 2017-08 as of November 1, 2019, with no material impact on the Fund’s financial statements.

In October 2020, FASB issued ASU No. 2020-08, Codification Improvements to Subtopic 310-20, Receivables—Nonrefundable Fees and Other Costs (“ASU 2020-08”). ASU 2020-08 was issued to clarify how to amortize premiums for debt securities where there are bonds with multiple call dates. The amendments are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. Management has evaluated the impact of this guidance within the Fund’s financial statements and has determined the adoption of ASU 2020-08 will have no impact on the Fund’s financial statements.

Fund Valuation. The valuation of the Fund’s investments is in accordance with policies and procedures adopted by and under the ultimate supervision of the board of trustees.

Fund securities that are traded on U.S. securities exchanges, except option securities, are valued at the official closing price, which is the last current reported sales price on its principal exchange at the time each Fund determines its net asset value (“NAV”). Securities traded in the over-the-counter market and quoted on The NASDAQ Stock Market are valued at the NASDAQ Official Closing Price, as determined by NASDAQ, or lacking a NASDAQ Official Closing Price, the last current reported sale price on NASDAQ at the time the Fund determines its NAV. When a last sale or closing price is not available, equity securities, other than option securities, that are traded on a U.S. securities exchange and other equity securities traded in the over-the-counter market are valued at the mean between the most recent bid and asked quotations on its principal exchange in accordance with guidelines adopted by the board of trustees. Each option security traded on a U.S. securities exchange is valued at the mid-point of the consolidated bid/ask quote for the option security, also in accordance with guidelines adopted by the board of trustees. Each over-the-counter option that is not traded through the Options Clearing Corporation is valued either by an independent pricing agent approved by the board of trustees or based on a quotation provided by the counterparty to such option under the ultimate supervision of the board of trustees.

Fixed income securities, bank loans, certain convertible preferred securities, and non-exchange traded derivatives are normally valued by independent pricing services or by dealers or brokers who make markets in such securities. Valuations of such fixed income securities, bank loans, certain convertible preferred securities, and non-exchange traded derivatives consider yield or price of equivalent securities of comparable quality, coupon rate, maturity, type of issue, trading characteristics and other market data and do not rely exclusively upon exchange or over-the-counter prices.

Trading on European and Far Eastern exchanges and over-the-counter markets is typically completed at various times before the close of business on each day on which the New York Stock Exchange (“NYSE”) is open. Each security trading on these exchanges or in over-the-counter markets may be valued utilizing a systematic fair valuation model provided by an independent pricing service approved by the board of trustees. The valuation of each security that meets certain criteria in relation to the valuation model is systematically adjusted to reflect the impact of movement in the U.S. market after the foreign markets close. Securities that do not meet the criteria, or that are principally traded in other foreign markets, are valued as of the last reported sale price at the time the Fund determines its NAV, or when reliable market prices or quotations are not readily available, at the mean between the most recent bid and asked quotations as of the close of the appropriate exchange or other designated time. Trading of foreign securities may not take place on every NYSE business day. In addition, trading may take place in various foreign markets on Saturdays or on other days when the NYSE is not open and on which the Fund’s NAV is not calculated.

​

Notes to Financial Statements

44 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT

If the pricing committee determines that the valuation of a security in accordance with the methods described above is not reflective of a fair value for such security, the security is valued at a fair value by the pricing committee, under the ultimate supervision of the board of trustees, following the guidelines and/or procedures adopted by the board of trustees.

The Fund also may use fair value pricing, pursuant to guidelines adopted by the board of trustees and under the ultimate supervision of the board of trustees, if trading in the security is halted or if the value of a security it holds is materially affected by events occurring before the Fund’s pricing time but after the close of the primary market or exchange on which the security is listed. Those procedures may utilize valuations furnished by pricing services approved by the board of trustees, which may be based on market transactions for comparable securities and various relationships between securities that are generally recognized by institutional traders, a computerized matrix system, or appraisals derived from information concerning the securities or similar securities received from recognized dealers in those securities.

When fair value pricing of securities is employed, the prices of securities used by a Fund to calculate its NAV may differ from market quotations or official closing prices. There can be no assurance that the Fund could purchase or sell a portfolio security at the price used to calculate the Fund’s net asset value (“NAV”).

Investment Transactions. Investment transactions are recorded on a trade date basis as of October 31, 2020. Net realized gains and losses from investment transactions are reported on an identified cost basis. Interest income is recognized using the accrual method and includes accretion of original issue and market discount and amortization of premium. Dividend income is recognized on the ex-dividend date, except that certain dividends from foreign securities are recorded as soon as the information becomes available after the ex-dividend date.

Foreign Currency Translation. Values of investments and other assets and liabilities denominated in foreign currencies are translated into U.S. dollars using a rate quoted by a major bank or dealer in the particular currency market, as reported by a recognized quot ation dissemination service.

The Fund does not isolate that portion of the results of operations resulting from changes in foreign exchange rates on investments from the fluctuations arising from changes in market prices of securities held. Such fluctuations are included with the net realized and unrealized gain or loss from investments.

Reported net realized foreign currency gains or losses arise from disposition of foreign currency, the difference in the foreign exchange rates between the trade and settlement dates on securities transactions, and the difference between the amounts of dividends, interest and foreign withholding taxes recorded on the ex-date or accrual date and the U.S. dollar equivalent of the amounts actually received or paid. Net unrealized foreign exchange gains and losses arise from changes (due to the changes in the exchange rate) in the value of foreign currency and other assets and liabilities denominated in foreign currencies held at period end.

Allocation of Expenses Among Funds. Expenses directly attributable to the Fund are charged to the Fund; certain other common expenses of Calamos Advisors Trust, Calamos Investment Trust, Calamos Convertible Opportunities and Income Fund, Calamos Convertible and High Income Fund, Calamos Strategic Total Return Fund, Calamos Global Total Return Fund, Calamos Global Dynamic Income Fund, Calamos Dynamic Convertible and Income Fund, and Calamos Long/Short Equity & Dynamic Income Trust are allocated proportionately among each Fund to which the expenses relate in relation to the net assets of each Fund or on another reasonable basis.

Income Taxes. No provision has been made for U.S. income taxes because the Fund’s policy is to continue to qualify as a regulated investment company under the Internal Revenue Code of 1986, as amended, and distribute to shareholders substantially all of the Fund’s taxable income and net realized gains.

Dividends and distributions paid to common shareholders are recorded on the ex-dividend date. The amount of dividends and distributions from net investment income and net realized capital gains is determined in accordance with federal income tax regulations, which may differ from U.S. generally accepted accounting principles. To the extent these “book/tax” differences are permanent in nature, such amounts are reclassified within the capital accounts based on their federal tax-basis treatment. These differences are primarily due to differing treatments for foreign currency transactions, contingent payment debt instruments and methods of amortizing and accreting for fixed income securities. The financial statements are not adjusted for temporary differences.

​

Notes to Financial Statements

CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 45

Distributions to holders of mandatory redeemable preferred shares (“MRPS”) as described in Note 8 are accrued on a daily basis and are treated as an operating expense due to the fixed term of the obligation. The distributions are shown on the Statement of Operations as Interest expense and amortization of offering costs on Mandatory Redeemable Preferred Shares. For tax purposes, the distributions made to the holders of the MRPS are treated as dividends.

The Fund recognized no liability for uncertain tax positions. A reconciliation is not provided as the beginning and ending amounts of unrecognized benefits are zero, with no interim additions, reductions or settlements. Tax years 2017 - 2019 remain subject to examination by the U.S. and the State of Illinois tax jurisdictions.

Indemnifications. Under the Fund’s organizational documents, the Fund is obligated to indemnify its officers and trustees against certain liabilities incurred by them by reason of having been an officer or trustee of the Fund. In addition, in the normal course of business, the Fund may enter into contracts that provide general indemnifications to other parties. The Fund’s maximum exposure under these arrangements is unknown as this would involve future claims that may be made against the Fund that have not yet occurred. Currently, the Fund’s management expects the risk of material loss in connection to a potential claim to be remote.

Note 2 – Investment Adviser and Transactions With Affiliates Or Certain Other Parties

Pursuant to an investment advisory agreement with Calamos Advisors LLC (“Calamos Advisors”), the Fund pays an annual fee, payable monthly, equal to 1.00% based on the average weekly managed assets.

The Fund reimburses Calamos Advisors for a portion of compensation paid to the Fund’s Chief Compliance Officer. This compensation is reported as part of the “Trustees’ fees and officer compensation” expense on the Statement of Operations.

The Fund has adopted a deferred compensation plan (the “Plan”). Under the Plan, a trustee who is not an “interested person” (as defined in the 1940 Act) and has elected to participate in the Plan (a “participating trustee”) may defer receipt of all or a portion of their compensation from the Fund. The deferred compensation payable to the participating trustee is credited to the trustee’s deferral account as of the business day such compensation would have been paid to the participating trustee. The value of amounts deferred for a participating trustee is determined by reference to the change in value of Class I shares of one or more funds of Calamos Investment Trust designated by the participant. The value of the account increases with contributions to the account or with increases in the value of the measuring shares, and the value of the account decreases with withdrawals from the account or with declines in the value of the measuring shares. Deferred compensation of $74,365 is included in “Other assets” on the Statement of Assets and Liabilities at October 31, 2020. The Fund’s obligation to make payments under the Plan is a general obligation of the Fund and is included in “Payable for deferred compensation to trustees” on the Statement of Assets and Liabilities at October 31, 2020.

Note 3 – Investments

The cost of purchases and proceeds from sales of long-term investments for the year ended October 31, 2020 were as follows:

| U.S. Government Securities |  | Other
Cost of purchases | $671,455​ | ​ | $854,872,045​
Proceeds from sales | 13,890,520 | ​ | 903,164,270

The cost basis of investments for federal income tax purposes at October 31, 2020 was as follows:

Cost basis of investments | $775,465,217​ | ​
Gross unrealized appreciation | 43,155,444 | ​
Gross unrealized depreciation | (146,586,921 | )
Net unrealized appreciation (depreciation) | $(103,431,477​ | )

Note 4 – Income Taxes

For the fiscal year ended October 31, 2020, the Fund recorded the following permanent reclassifications to reflect tax character. The results of operations and net assets were not affected by these reclassifications.

Paid-in capital | $(47,076​ | )
Undistributed net investment income/(loss) | 9,777,413 | ​
Accumulated net realized gain/(loss) on investments | (9,730,337 | )

​

Notes to Financial Statements

46 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT

The Fund intends to make monthly distributions from its income available for distribution, which consists of the Fund’s dividends and interest income after payment of Fund expenses, and net realized gains on stock investments. At least annually, the Fund intends to distribute all or substantially all of its net realized capital gains, if any. Distributions are recorded on the ex-dividend date. The Fund distinguishes between distributions on a tax basis and a financial reporting basis. Accounting principles generally accepted in the United States of America require that only distributions in excess of tax basis earnings and profits be reported in the financial statements as a return of capital. Permanent differences between book and tax accounting relating to distributions are reclassified to paid-in-capital. For tax purposes, distributions from short-term capital gains are considered to be from ordinary income. Distributions in any year may include a return of capital component. The distributions list in the table below include interest expense for the Mandatory Redeemable Preferred Shares.

Distributions for the year ended October 31, 2020 were characterized for federal income tax purposes as follows:

| Year Ended October 31, 2020 |  | Year Ended October 31, 2019
Distributions paid from: | ​ | ​ | ​
Ordinary income | $52,427,715​ | ​ | $19,294,423​
Long-term capital gains | — | ​ | 8,169,015
Return of capital | — | ​ | 24,857,617

As of October 31, 2020, the components of accumulated earnings/(loss) on a tax basis were as follows:

Undistributed ordinary income | $7,825,741​ | ​
Undistributed capital gains | — | ​
Total undistributed earnings | 7,825,741 | ​
Accumulated capital and other losses | (2,234,645 | )
Net unrealized gains/(losses) | (103,598,864 | )
Total accumulated earnings/(losses) | (98,007,768 | )
Other | (22,957 | )
Paid-in-capital | 574,563,688 | ​
Net assets applicable to common shareholders | $476,532,963​ | ​

Note 5 – Short Sales

Securities sold short represent obligations to deliver the securities at a future date. The Fund may sell a security it does not ow n in anticipation of a decline in the value of that security before the delivery date. When a Fund sells a security short, it must borrow the security sold short and deliver it to the broker-dealer through which it made the short sale. Dividends paid on securities sold short are disclosed as an expense on the Statement of Operations. A gain, limited to the price at which a Fund sold the security short, or a loss, unlimited in size, will be realized upon the termination of a short sale.

To secure its obligation to deliver to the broker-dealer the securities sold short, the Fund must segregate an amount of cash or liquid securities with its custodian equal to any excess of the current market value of the securities sold short over any cash or liquid securities deposited as collateral with the broker in connection with the short sale (not including the proceeds of the short sale). As a result of that requirement, the Fund will not gain any leverage merely by selling short, except to the extent that it earns interest or other income or gains on the segregated cash or liquid securities while also being subject to the possibility of gain or loss from the securities sold short.

Note 6 – Derivative Instruments

Foreign Currency Risk. The Fund may engage in portfolio hedging with respect to changes in currency exchange rates by entering into forward foreign currency contracts to purchase or sell currencies. A forward foreign currency contract is a commitment to purchase or sell a foreign currency at a future date at a negotiated forward rate. Risks associated with such contracts include, among other things, movement in the value of the foreign currency relative to the U.S. dollar and the ability of the counterparty to perform.

To mitigate the counterparty risk, the Fund may enter into an International Swaps and Derivatives Association, Inc. Master Agreement (“ISDA Master Agreement”) or similar agreement with its derivative contract counterparties. An ISDA Master Agreement is a bilateral agreement between the Fund and a counterparty that governs over-the-counter derivatives and foreign exchange contracts and typically contains, among other things, collateral posting terms and netting provisions in the event of a default and/or termination event.

​

Notes to Financial Statements

CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 47

Under an ISDA Master Agreement, the Fund may, under certain circumstances, offset with the counterparty certain derivative financial instrument’s payables and/or receivables with collateral held and/or posted and create one single net payment. The provisions of the ISDA Master Agreement typically permit a single net payment in the event of default (close-out netting), including the bankruptcy or insolvency of the counterparty. Generally, collateral is exchanged between the Fund and the counterparty and the amount of collateral due from the Fund or to a counterparty has to exceed a minimum transfer amount threshold before a transfer has to be made. To the extent amounts due to the Fund from its counterparties are not fully collateralized, contractually or otherwise, the Fund bears the risk of loss from counterparty nonperformance. When a Fund is required to post collateral under the terms of a derivatives transaction and master netting agreement, the Fund’s custodian holds the collateral in a segregated account, subject to the terms of a tri-party agreement among the Fund, the custodian and the counterparty. The master netting agreement and tri-party agreement provide, in relevant part, that the counterparty may have rights to the amounts in the segregated account in the event that the Fund defaults in its obligation with respect to the derivative instrument that is subject to the collateral requirement. When a counterparty is required to post collateral under the terms of a derivatives transaction and master netting agreement, the counterparty delivers such amount to the Fund’s custodian. The master netting agreement provides, in relevant part, that the Fund may have rights to such collateral in the event that the counterparty defaults in its obligation with respect to the derivative instrument that is subject to the collateral requirement. Generally before a default, neither the Fund nor the counterparty may resell, rehypothecate, or repledge any collateral that it receives.

For financial reporting purposes, the Fund does not offset derivative assets and derivative liabilities that are subject to netting arrangements in the Statement of Assets and Liabilities. The net unrealized gain, if any, represents the credit risk to the Fund on a forward foreign currency contract. The contracts are valued daily at forward foreign exchange rates. The Fund realizes a gain or loss when a position is closed or upon settlement of the contracts. There were no open forward foreign currency contracts at October 31, 2020.

Equity Risk. The Fund may engage in option transactions and in doing so achieves similar objectives to what it would achieve through the sale or purchase of individual securities. A call option, upon payment of a premium, gives the purchaser of the option the right to buy, and the seller of the option the obligation to sell, the underlying security, index or other instrument at the exercise price. A put option gives the purchaser of the option, upon payment of a premium, the right to sell, and the seller the obligation to buy, the underlying security, index, or other instrument at the exercise price.

To seek to offset some of the risk of a potential decline in value of certain long positions, the Fund may also purchase put options on individual securities, broad-based securities indexes or certain exchange-traded funds (“ETFs”). The Fund may also seek to generate income from option premiums by writing (selling) options on a portion of the equity securities (including securities that are convertible into equity securities) in the Fund’s portfolio, on broad-based securities indexes, or certain ETFs.

When a Fund purchases an option, it pays a premium and an amount equal to that premium is recorded as an asset. When a Fund writes an option, it receives a premium and an amount equal to that premium is recorded as a liability. The asset or liability is adjusted daily to reflect the current market value of the option. If an option expires unexercised, the Fund realizes a gain or loss to the extent of the premium received or paid. If an option is exercised, the premium received or paid is recorded as an adjustment to the proceeds from the sale or the cost basis of the purchase. The difference between the premium and the amount received or paid on a closing purchase or sale transaction is also treated as a realized gain or loss. The cost of securities acquired through the exercise of call options is increased by premiums paid. The proceeds from securities sold through the exercise of put options are decreased by the premiums paid. Gain or loss on written options and purchased options is presented separately on the Statement of Operations as net realized gain or loss on written options and net realized gain or loss on purchased options, respectively.

Options written by the Fund do not typically give rise to counterparty credit risk since options written obligate the Fund and not the counterparty to perform. Exchange traded purchased options have minimal counterparty credit risk to the Fund since the exchange’s clearinghouse, as counterparty to such instruments, guarantees against a possible default.

As of October 31, 2020, the Fund had outstanding purchased options and/or written options as listed on the Schedule of Investments.

Interest Rate Risk. The Fund may engage in interest rate swaps primarily to hedge the interest rate risk on the Fund’s borrowings (see Note 7 – Notes Payable). An interest rate swap is a contract that involves the exchange of one type of interest rate for another type of interest rate. If interest rates rise, resulting in a diminution in the value of the Fund’s portfoli o, the Fund would receive payments under the swap that would offset, in whole or in part, such diminution in value; if interest rates fall, the Fund would likely lose money on the swap transaction. Unrealized gains are reported as an asset, and unrealized losses are reported as a liability on the Statement of Assets and Liabilities. The change in value of swaps, including accruals of periodic amounts of interest to be paid or received on swaps, is reported

​

Notes to Financial Statements

48 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT

as change in net unrealized appreciation/depreciation on interest rate swaps in the Statement of Operations. A realized gain or loss is recorded in net realized gain (loss) on interest rate swaps in the Statement of Operations upon payment or receipt of a periodic payment or termination of the swap agreements. Swap agreements are stated at fair value. Notional principal amounts are used to express the extent of involvement in these transactions, but the amounts potentially subject to credit risk are much smaller. In connection with these contracts, securities may be identified as collateral in accordance with the terms of the respective swap contracts in the event of default or bankruptcy of the Fund. Please see the disclosure regarding ISDA Master Agreements under Foreign Currency Risk within this note.

Premiums paid to or by a Fund are accrued daily and included in realized gain (loss) when paid on swaps in the accompanying Statement of Operations. The contracts are marked-to-market daily based upon third party vendor valuations and changes in value are recorded as unrealized appreciation (depreciation). Gains or losses are realized upon early termination of the contract. Risks may exceed amounts recognized in the Statement of Assets and Liabilities. These risks include changes in the returns of the underlying instruments, failure of the counterparties to perform under the contracts’ terms, counterparty’s creditworthiness, and the possible lack of liquidity with respect to the contracts.

As of October 31, 2020, the Fund had no outstanding interest rate swap agreements.

As of October 31, 2020, the Fund had outstanding derivative contracts which are reflected on the Statement of Assets and Liabilities as follows:

| ASSET DERIVATIVES |  | LIABILITY DERIVATIVES
Gross amounts at fair value:
Purchased options(1) | $ | 15,109,242 | ​ | ​ | $ | —
| $ | 15,109,242 | ​ | ​ | $ | —

(1)Generally, the Statement of Assets and Liabilities location for “Purchased options” is “Investments in securities, at value”.

For the year ended October 31, 2020, the volume of derivative activity for the Fund is reflected below:*

| Volume
Forward Contracts | 2,419,967
Purchased Options | 56,923
Written options | 40,328

*Activity during the period is measured by opened number of contracts for options purchased or written and opened foreign currency contracts (measured in notional).

Note 7 – Notes Payable

The Fund has entered into an Amended and Restated Liquidity Agreement (the “SSB Agreement”) with State Street Bank and Trust Company (“SSB”) that allows the Fund to borrow up to a limit of $265.0 million, as well as engage in securities lending and securities repurchase transactions. Borrowings under the SSB Agreement are secured by assets of the Fund that are held with the Fund’s custodian in a separate account (the “pledged collateral”). Interest on the SSB Agreement is charged on the drawn amount at the rate of Overnight LIBOR plus .80%. A commitment fee of .10% is payable on any undrawn balance. For the year ended October 31, 2020, the average borrowings under the Agreement were $148.3 million. For the year ended October 31, 2020, the average interest rate was 1.31%. As of October 31, 2020, the amount of total outstanding borrowings was $153.3 million, which approximates fair value. The interest rate applicable to the borrowings on October 31, 2020 was 0.66%.

Under the terms of the SSB Agreement, all securities lent through SSB must be secured continuously by collateral received in cash. Cash collateral held by SSB on behalf of a Fund may be credited against the amounts borrowed under the SSB Agreement. Under the terms of the SSB Agreement, SSB will return the value of the collateral to the borrower at the termination of the selected securities loan(s), which will eliminate the credit against the borrowings under the SSB Agreement and will cause the amount drawn under the SSB Agreement to increase in an amount equal to the returned collateral. The cash collateral credits against the amounts borrowed are not reflected separately in the Statement of Assets and Liabilities but as a component of the Notes Payable. Under the terms of the SSB Agreement, the Fund will receive a rebate payment related to the securities lending and/or securities repurchase transactions which is reflected in interest expense in the Statement of Operations. The Fund has the right to call a loan and obtain the securities loaned at any time. As of October 31, 2020, approximately $81.7 million of securities were on loan ($52.1 million of fixed income securities and $29.5 million of equity securities) under the SSB Agreement which are reflected in the Investment in securities, at value on the Statement of Assets and Liabilities. The borrowings are categorized as Level 2 within the fair value hierarchy.

​

Notes to Financial Statements

CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 49

Note 8 – Mandatory Redeemable Preferred Shares

On September 6, 2017, the Fund issued 2,600,000 mandatory redeemable preferred shares (“MRPS”) with an aggregate liquidation preference of $65.0 million. Offering costs incurred by the Fund in connection with the MRPS issuance are aggregated with the outstanding liability and are being amortized to Interest expense and amortization of offering costs on Mandatory Redeemable Preferred Shares over the respective life of each series of MRPS and shown in the Statement of Operations.

The MRPS are divided into three series with different mandatory redemption dates and dividend rates. The table below summarizes the key terms of each series of the MRPS at October 31, 2020.

Series |  | Term Redemption Date |  | Dividend Rate |  | Shares (000’s) |  | Liquidation Preference Per Share |  | Aggregate Liquidation Preference
Series A | ​ | 9/06/22 | ​ | 3.70% | ​ | 860 | ​ | $25 | ​ | $21,500,000​
Series B | ​ | 9/06/24 | ​ | 4.00% | ​ | 860 | ​ | $25 | ​ | $21,500,000​
Series C | ​ | 9/06/27 | ​ | 4.24% | ​ | 880 | ​ | $25 | ​ | $22,000,000​
| ​ | ​ | ​ | ​ | ​ | ​ | ​ | Total | ​ | $65,000,000​

The MRPS are not listed on any exchange or automated quotation system. The MRPS are considered debt of the issuer; therefore, the liquidation preference, which approximates fair value of the MRPS, is recorded as a liability in the Statement of Assets and Liabilities net of deferred offering costs. The MRPS are categorized as Level 2 within the fair value hierarchy.

Holders of MRPS are entitled to receive monthly cumulative cash dividends payable on the first business day of each month. The MRPS currently are rated “AA” by Fitch Ratings, Inc. (“Fitch”). If on the first day of a monthly dividend period the MRPS of any class are rated lower than “A” by Fitch (or lower than the equivalent of such rating by any other rating agency providing a rating pursuant to the request of the Fund), the dividend rate for such period shall be increased by 0.5%, 2.0% or 4.0% according to an agreed upon schedule. The MRPS’ dividend rate is also subject to increase during periods when the Fund has not made timely payments to MRPS holders and/or the MRPS do not have a current credit rating, subject to various terms and conditions. Dividends accrued and paid to the shareholders of MRPS are included in “Interest expense and amortization of offering costs on Mandatory Redeemable Preferred Shares” within the Statement of Operations.

The MRPS rank junior to the Fund’s borrowings under the SSB Agreement and senior to the Fund’s outstanding common stock. The Fund may, at its option, subject to various terms and conditions, redeem the MRPS, in whole or in part, at the liquidation preference amount plus all accumulated but unpaid dividends, plus a make whole premium equal to the discounted value of the remaining scheduled payments. Each class of MRPS is subject to mandatory redemption on the term redemption date specified in the table above. Periodically, the Fund is subject to an overcollateralization test based on applicable rating agency criteria (the “OC Test”) and an asset coverage test with respect to its outstanding senior securities (the “AC Test”). The Fund may be required to redeem MRPS before their term redemption date if it does not comply with one or both tests. So long as any MRPS are outstanding, the Fund may not declare, pay or set aside for payment cash dividends or other distributions on shares of its common stock unless (1) the Fund has satisfied the OC Test on at least one testing date in the preceding 65 days, (2) immediately after such transaction, the Fund would comply with the AC Test, (3) full cumulative dividends on the MRPS due on or prior to the date of such transaction have been declared and paid and (4) the Fund has redeemed all MRPS required to have been redeemed on such date or has deposited funds sufficient for such redemption, subject to certain grace periods and exceptions.

Except as otherwise required pursuant to the Fund’s governing documents or applicable law, the holders of the MRPS have one vote per share and vote together with the holders of common stock of the Fund as a single class except on matters affecting only the holders of MRPS or the holders of common stock. Pursuant to the 1940 Act, holders of the MRPS have the right to elect at least two trustees of the Fund, voting separately as a class. Except during any time when the Fund has failed to make a dividend or redemption payment in respect of MRPS outstanding, the holders of MRPS have agreed to vote in accordance with the recommendation of the board of trustees on any matter submitted to them for their vote or to the vote of shareholders of the Fund generally.

​

Notes to Financial Statements

50 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT

Note 9 – Common Shares

There are unlimited common shares of beneficial interest authorized and 59,367,858 shares outstanding at October 31, 2020. Transactions in common shares were as follows:

| Year ENDED October 31, 2020 |  | YEAR ENDED October 31, 2019
Beginning shares | 59,261,624 | ​ | 59,149,167
Shares issued through reinvestment of distributions | 106,234 | ​ | 112,457
Ending shares | 59,367,858 | ​ | 59,261,624

Notice is hereby given in accordance with Section 23(c) of the 1940 Act that the Fund may from time to time purchase its shares of common stock in the open market.

The Fund also may offer and sell common shares from time to time at an offering price equal to or in excess of the net asset value per share of the Fund’s common shares at the time such common shares are initially sold.

Note 10 – Fair Value Measurements

Various inputs are used to determine the value of the Fund’s investments. These inputs are categorized into three broad levels a s follows:

•Level 1 – Prices are determined using inputs from unadjusted quoted prices from active markets (including securities actively traded on a securities exchange) for identical assets.

•Level 2 – Prices are determined using significant observable market inputs other than unadjusted quoted prices, including quoted prices of similar securities, fair value adjustments to quoted foreign securities, interest rates, credit risk, prepayment speeds, and other relevant data.

•Level 3 – Prices reflect unobservable market inputs (including the Fund’s own judgments about assumptions market participants would use in determining fair value) when observable inputs are unavailable.

Debt securities are valued based upon evaluated prices received from an independent pricing service or from a dealer or broker who makes markets in such securities. Pricing services utilize various observable market data and as such, debt securities are generally categorized as Level 2. The levels are not necessarily an indication of the risk or liquidity of the Fund’s investments.

The following is a summary of the inputs used in valuing the Fund’s holdings at fair value:

| LEVEL 1 |  | LEVEL 2 |  | LEVEL 3 |  | TOTAL
Assets:
Corporate Bonds | $ | — | ​ | $ | 93,463,518 | ​ | $ | — | ​ | $ | 93,463,518
Convertible Bonds | ​ | — | ​ | ​ | 161,919,083 | ​ | ​ | — | ​ | ​ | 161,919,083
Bank Loans | ​ | — | ​ | ​ | 11,260,267 | ​ | ​ | — | ​ | ​ | 11,260,267
Convertible Preferred Stocks | ​ | 66,638,635 | ​ | ​ | 932,760 | ​ | ​ | — | ​ | ​ | 67,571,395
Common Stocks U.S. | ​ | 198,212,580 | ​ | ​ | 33,781 | ​ | ​ | — | ​ | ​ | 198,246,361
Common Stocks Foreign | ​ | 14,077,415 | ​ | ​ | 121,624,307 | ​ | ​ | — | ​ | ​ | 135,701,722
Warrants | ​ | — | ​ | ​ | 5,884 | ​ | ​ | — | ​ | ​ | 5,884
Preferred Stocks | ​ | 948,636 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 948,636
Purchased options | ​ | 15,109,242 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 15,109,242
Short Term Investments |  | 8,917,520 |  |  | — |  |  | — |  |  | 8,917,520
Total | $ | 303,904,028 |  | $ | 389,239,600 |  | $ | — |  | $ | 693,143,628
Liabilities:
Common Stocks Sold Short U.S. | $ | 21,109,888 |  | $ | — |  | $ | — |  | $ | 21,109,888
Total | $ | 21,109,888 |  | $ | — |  | $ | — |  | $ | 21,109,888

​

Financial Highlights

CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 51

Selected data for a share outstanding throughout each year were as follows:

​ | ​ | Year Ended October 31,
| 2020 | 2019 | 2018 | 2017 | 2016
PER SHARE OPERATING PERFORMANCE
Net asset value, beginning of year | $7.90 | ​ | $7.98 | ​ | $9.21 | ​ | $8.16 | ​ | $8.92 | ​
Income from investment operations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net investment income (loss)* | 0.15 | ​ | 0.17 | ​ | 0.18 | ​ | 0.22 | ​ | 0.28 | ​
Net realized and unrealized gain (loss) | 0.82 | ​ | 0.59 | ​ | (0.57 | ) | 1.67 | ​ | (0.20 | )
Total from investment operations | 0.97 | ​ | 0.76 | ​ | (0.39 | ) | 1.89 | ​ | 0.08 | ​
Less distributions to common shareholders from: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net investment income | (0.32 | ) | (0.28 | ) | (0.84 | ) | (0.76 | ) | (0.46 | )
Net realized gains | (0.52 | ) | (0.14 | ) | — | ​ | (0.08 | ) | — | ​
Return of capital | — | ​ | (0.42 | ) | — | ​ | — | ​ | (0.38 | )
Total distributions | (0.84 | ) | (0.84 | ) | (0.84 | ) | (0.84 | ) | (0.84 | )
Premiums from shares sold in at the market offerings | — | ​ | — | ​ | — | ​ | — | ​ | — | ​
Net asset value, end of year | $8.03 | ​ | $7.90 | ​ | $7.98 | ​ | $9.21 | ​ | $8.16 | ​
Market value, end of year | $7.80 | ​ | $8.13 | ​ | $7.59 | ​ | $9.13 | ​ | $7.16 | ​
TOTAL RETURN APPLICABLE TO COMMON SHAREHOLDERS
Total investment return based on:(a) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net asset value | 14.00% | ​ | 10.29% | ​ | (4.85)% | ​ | 25.23% | ​ | 2.98% | ​
Market value | 7.60% | ​ | 19.34% | ​ | (8.71)% | ​ | 41.48% | ​ | 4.95% | ​
RATIOS TO AVERAGE NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS
Net expenses(b) | 2.70% | ​ | 3.41% | ​ | 2.97% | ​ | 2.23% | ​ | 2.06% | ​
Net investment income (loss) | 1.91% | ​ | 2.12% | ​ | 1.95% | ​ | 2.58% | ​ | 3.42% | ​
SUPPLEMENTAL DATA
Net assets applicable to common shareholders, end of year (000) | $476,533 | ​ | $468,186 | ​ | $471,953 | ​ | $543,275 | ​ | $481,513 | ​
Portfolio turnover rate | 128% | ​ | 78% | ​ | 93% | ​ | 99% | ​ | 29% | ​
Average commission rate paid | $0.0210 | ​ | $0.0279 | ​ | $0.0199 | ​ | $0.0295 | ​ | $0.0289 | ​
Mandatory Redeemable Preferred Shares, at redemption value ($25 per share liquidation preference) (000’s omitted) | $65,000 | ​ | $65,000 | ​ | $65,000 | ​ | $65,000 | ​ | $— | ​
Notes Payable (000’s omitted) | $153,250 | ​ | $174,500 | ​ | $204,000 | ​ | $160,000 | ​ | $196,000 | ​
Asset coverage per $1,000 of loan outstanding(c) | $4,534 | ​ | $4,056 | ​ | $3,632 | ​ | $4,802 | ​ | $3,457 | ​
Asset coverage per $25 liquidation value per share of Mandatory Redeemable Preferred Shares(d) | $267 | ​ | $272 | ​ | $285 | ​ | $295 | ​ | $— | ​

*Net investment income calculated based on average shares method.

(a)Total investment return is calculated assuming a purchase of common stock on the opening of the first day and a sale on the closing of the last day of the period reported. Dividends and distributions are assumed, for purposes of this calculation, to be reinvested at prices obtained under the Fund’s dividend reinvestment plan. Total return is not annualized for periods less than one year. Brokerage commissions are not reflected. NAV per share is determined by dividing the value of the Fund’s portfolio securities, cash and other assets, less all liabilities, by the total number of common shares outstanding. The common share market price is the price the market is willing to pay for shares of the Fund at a given time. Common share market price is influenced by a range of factors, including supply and demand and market conditions.

(b)Ratio of net expenses, excluding interest expense on Notes Payable and interest expense and amortization of offering costs on Mandatory Redeemable Preferred Shares, to average net assets was 1.61%, 1.65%, 1.60%, 1.53%, and 1.54%, respectively.

(c)Calculated by subtracting the Fund’s total liabilities (not including Notes payable and Mandatory Redeemable Preferred Shares) from the Fund’s total assets and dividing this by the amount of notes payable outstanding, and by multiplying the result by 1,000.

(d)Calculated by subtracting the Fund’s total liabilities (not including Notes payable and Mandatory Redeemable Preferred Shares) from the Fund’s total assets and dividing this by the amount of Mandatory Redeemable Preferred Shares outstanding, and by multiplying the result by 25.

​

Report of Independent Registered Public Accounting Firm

52 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT

To the shareholders and the Board of Trustees of
Calamos Global Dynamic Income Fund

Opinion on the Financial Statements and Financial Highlights

We have audited the accompanying statement of assets and liabilities of Calamos Global Dynamic Income Fund (the “Fund”), including the schedule of investments, as of October 31, 2020, the related statements of operations and cash flows for the year then ended, the statements of changes in net assets for each of the two years in the period then ended, the financial highlights for each of the five years in the period then ended, and the related notes. In our opinion, the financial statements and financial highlights present fairly, in all material respects, the financial position of the Fund as of October 31, 2020, and the results of its operations and its cash flows for the year then ended, the changes in its net assets for each of the two years in the period then ended, and the financial highlights for each of the five years in the period then ended in conformity with accounting principles generally accepted in the United States of America.

Basis for Opinion

These financial statements and financial highlights are the responsibility of the Fund’s management. Our responsibility is to express an opinion on the Fund’s financial statements and financial highlights based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Fund in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements and financial highlights are free of material misstatement, whether due to error or fraud. The Fund is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Fund’s internal control over financial reporting. Accordingly, we express no such opinion.

Our audits included performing procedures to assess the risks of material misstatement of the financial statements and financial highlights, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements and financial highlights. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements and financial highlights. Our procedures included confirmation of securities owned as of October 31, 2020, by correspondence with the custodian and brokers; when replies were not received from brokers, we performed other auditing procedures. We believe that our audits provide a reasonable basis for our opinion.

Chicago, Illinois

December 18, 2020

We have served as the auditor of one or more Calamos Advisors LLC investment companies since 2003.

​

CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 53

Trustee Approval of Management Agreement(Unaudited)

The Board of Trustees (“Board” or the “Trustees”) of the Fund oversees the management of the Fund, and, as required by law, determines annually whether to continue the Fund’s management agreement with Calamos Advisors LLC (“Adviser”) pursuant to which the Adviser serves as the investment manager and administrator for the Fund. The “Independent Trustees,” who comprise more than 80% of the Board, have never been affiliated with the Adviser.

In connection with their most recent consideration regarding the continuation of the management agreement, the Trustees received and reviewed a substantial amount of information provided by the Adviser in response to detailed requests of the Independent Trustees and their independent legal counsel. In the course of their consideration of the agreement, the Independent Trustees were advised by their counsel, and in addition to meeting with management of the Adviser, they met separately in executive session with their counsel.

At a meeting held on June 30, 20201, based on their evaluation of the information referred to above and other information provided in this and previous meetings, the Trustees determined that the overall arrangements between the Fund and the Adviser were fair in light of the nature, quality and extent of the services provided by the Adviser and its affiliates, the fees charged for those services and other matters that the Trustees considered relevant in the exercise of their business judgment. At that meeting, the Trustees, including all of the Independent Trustees, approved the continuation of the management agreement through July 31, 2021, subject to possible earlier termination as provided in the agreement.

In connection with its consideration of the management agreement, the Board considered, among other things: (i) the nature, quality and extent of the Adviser’s services, (ii) the investment performance of the Fund as well as performance information for comparable funds and other, comparable clients of the Adviser, (iii) the fees and other expenses paid by the Fund as well as expense information for comparable funds and for other, comparable clients of the Adviser, (iv) the profitability of the Adviser and its affiliates from their relationship with the Fund, (v) whether economies of scale may be realized as the Fund grows and whether potential economies may be shared, in some measure, with Fund investors and (vi) other benefits to the Adviser from its relationship with the Fund. In the Board’s deliberations, no single factor was responsible for the Board’s decision to approve continuation of the management agreement, and each Trustee may have afforded different weight to the various factors.

Nature, Quality and Extent of Services. The Board’s consideration of the nature, quality and extent of the Adviser’s services to the Fund took into account the knowledge gained from the Board’s meetings with the Adviser throughout the years. In addition, the Board considered: the Adviser’s long-term history of managing the Fund; the consistency of investment approach; the background and experience of the Adviser’s investment personnel responsible for managing the Fund; and the Adviser’s performance as administrator of the Fund, including, among other things, in the areas of brokerage selection, trade execution, compliance and shareholder communications. The Board also reviewed the Adviser’s resources and key personnel involved in providing investment management services to the Fund. The Board noted the personal investments that the Adviser’s key investment personnel have made in the Fund, which further aligns the interests of the Adviser and its personnel with those of the Fund’s shareholders. In addition, the Board considered compliance reports about the Adviser from the Fund’s Chief Compliance Officer.

The Board also considered the information provided by the Adviser regarding the Fund’s performance and the steps the Adviser is taking to improve performance. In particular, the Board noted the additional personnel added to the investment team, which includes portfolio managers, research analysts, research associates and risk management personnel. The Board also noted the Adviser’s significant investment into its infrastructure and investment processes.

Investment Performance of the Fund. The Board considered the Fund’s investment performance over various time periods, including how the Fund performed compared to the median performance of a group of comparable funds (the Fund’s “Category”) selected by an independent third-party service provider. The performance periods considered by the Board ended on March 31, 2020, except where otherwise noted. Where available, the Board considered one-, three-, five- and ten-year performance. To the extent the Board considered data for periods other than those ending on March 31, 2020 or considered comparative data in addition to that of the Category, the data was still produced by the independent third-party service provider.

The Board considered that the Fund outperformed its Category median for the one-, three-, and five-year periods and that its performance was equal to the Category median for the ten-year period.

1 The meeting was held via videoconference in reliance on an exemptive order issued by the Securities and Exchange Commission on June 19, 2020.

​

54 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT

Trustee Approval of Management Agreement(Unaudited)

Costs of Services Provided and Profits Realized by the Adviser. Using information provided by an independent third-party service provider, the Board evaluated the Fund’s actual management fee rate compared to the median management fee rate for other closed-end funds similar in size, character and investment strategy (the Fund’s “Expense Group”), and the Fund’s total expense ratio compared to the median total expense ratio of the Fund’s Expense Group.

The Board also reviewed the Adviser’s management fee rates for its institutional separate accounts and noted the Adviser’s assertion that the Adviser does not manage sub-advisory accounts. The Board took into account that although, generally, the rates of fees paid by institutional clients were lower than the rates of fees paid by the Fund, the differences reflected the Adviser’s greater level of responsibilities and significantly broader scope of services regarding the Fund, the more extensive regulatory obligations and risks associated with managing the Fund, and other financial considerations with respect to creation and sponsorship of the Fund. The Board considered factors that lead to more expenses for registered funds including but not limited to: (i) capital expenditures to establish a fund, (ii) length of time to reach critical mass, and the related expenses, (iii) higher servicing costs of intermediaries and shareholders, (iv) higher redemption rates of assets under management, (v) entrepreneurial risk assumed by the Adviser and (vi) greater exposure to “make whole” errors.

The Board also considered the Adviser’s costs in serving as the Fund’s investment adviser and manager, including but not limited to costs associated with technology, infrastructure and compliance necessary to manage the Fund. The Board reviewed the Adviser’s methodology for allocating costs among the Adviser’s lines of business. The Board also considered information regarding the structure of the Adviser’s compensation program for portfolio managers, analysts and certain other employees, and the relationship of such compensation to the attraction and retention of quality personnel. Finally, the Board reviewed information on the profitability of the Adviser in serving as the Fund’s investment manager and of the Adviser and its affiliates in all of their relationships with the Fund, as well as an explanation of the methodology utilized in allocating various expenses among the Fund and the Adviser’s other business units. Data was provided to the Board with respect to profitability, both on a pre- and post-marketing cost basis. The Board reviewed the financial statements of the Adviser’s parent company and discussed its corporate structure.

The Board considered that the Fund’s total expense ratio is lower than the median of the Fund’s Expense Group, though the Fund’s management fee rate is higher than its Expense Group median. The Board reviewed the Fund’s expenses in light of its per formance reco rd.

Economies of Scale. The Board considered whether the Fund’s management fee shares with shareholders potential economies of scale that may be achieved by the Adviser. The Board also considered the benefits accruing to shareholders from the Adviser’s investments into its infrastructure and investment processes.

Other Benefits Derived from the Relationship with the Fund. The Board also considered other benefits that accrue to the Adviser and its affiliates from their relationship with the Fund. The Board concluded that while the Adviser may potentially benefit from its relationship with the Fund in ways other than the fees payable by the Fund, the Fund also may benefit from its relationship with the Adviser in ways other than the services to be provided by the Adviser and its affiliates pursuant to their agreement with the Fund and the fees payable by the Fund.

The Board also considered the Adviser’s use of a portion of the commissions paid by the Fund on its portfolio brokerage transactions to obtain research products and services benefiting the Fund and/or other clients of the Adviser and concluded, based on reports from the Fund’s Chief Compliance Officer, that the Adviser’s use of “soft” commission dollars to obtain research products and services was consistent with regulatory requirements.

After full consideration of the above factors as well as other factors that were instructive in their consideration, the Trustees, including all of the Independent Trustees, concluded that the continuation of the management agreement with the Adviser was in the best interest of the Fund and its shareholders.

​

CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 55

Tax Information(Unaudited)

We are providing this information as required by the Internal Revenue Code (Code). The amounts shown may differ from those elsewhere in this report due to differences between tax and financial reporting requirements. In February 2021, shareholders will receive Form 1099-DIV which will include their share of qualified dividends and capital gains distributed during the calendar year 2020. Shareholders are advised to check with their tax advisors for information on the treatment of these amounts on their individual income tax returns.

Under Section 854(b)(2) of the Code, the Fund hereby designates $7,586,838 or the maximum amount allowable under the Code, as qualified dividends for the fiscal year ended October 31, 2020.

Under Section 854(b)(2) of the Code, the Fund hereby designates 7.97% of the ordinary income dividends as income qualifying for the corporate dividends received deduction for the fiscal year ended October 31, 2020.

​

56 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT

Trustees and Officers(Unaudited)

The management of the Fund, including general supervision of the duties performed for the Fund under the investment management agreement between the Fund and Calamos Advisors, is the responsibility of its board of trustees. Each trustee elected will hold office for the terms noted below or until such trustee’s earlier resignation, death or removal; however, each trustee who is not an interested person of the Fund shall retire as a trustee at the end of the calendar year in which the trustee attains the age of 75 years. The Fund’s Statement of Additional Information contains additional information about the Fund’s Trustees and Officers and is available without charge, upon request, at www.calamos.com or by calling 800.582.6959.

The following table sets forth each trustee’s name, year of birth, position(s) with the Fund, number of portfolios in the Calamos Fund Complex overseen, principal occupation(s) during the past five years and other directorships held, and date first elected or appointed.

NAME AND YEAR OF BIRTH | ​ | POSITION(S) AND LENGTH OF TIME WITH THE FUND | ​ | PORTFOLIOS IN FUND COMPLEX^ OVERSEEN | ​ | PRINCIPAL OCCUPATION(S) DURING THE PAST 5 YEARS AND OTHER DIRECTORSHIPS
Trustees who are interested persons of the Fund: | ​ | ​ | ​ | ​
John P. Calamos, Sr., (1940)* | ​ | Chairman, Trustee and President (since 2007) Term Expires 2023 | ​ | 26 | ​ | Founder, Chairman and Global Chief Investment Officer, Calamos Asset Management, Inc. (“CAM”), Calamos Investments LLC (“CILLC”), Calamos Advisors LLC and its predecessor (“Calamos Advisors”) and Calamos Wealth Management LLC (“CWM”); Director, CAM; and previously Chief Executive Officer, Calamos Financial Services LLC and its predecessor (“CFS”), CAM, CILLC, Calamos Advisors, and CWM
Trustees who are not interested persons of the Fund: | ​ | ​ | ​ | ​
John E. Neal, (1950) | ​ | Trustee (since 2007) Lead Independent Trustee (since July 2019) Term Expires 2021 | ​ | 26 | ​ | Retired; Private investor; formerly, Director, Equity Residential Trust (publicly-owned REIT); Director, Creation Investments (private international microfinance company); Director, Centrust Bank (Northbrook Illinois community bank); Director, Neuro-ID (private company providing prescriptive analytics for the risk industry); Partner, Lind en LLC (health care private equity) (until 2018)
William R. Rybak, (1951) | ​ | Trustee (since 2007) Term Expires 2023 | ​ | 26 | ​ | Private investor; Chairman (since 2016) and Director (since 2010), Christian Brothers Investment Services Inc.; Trustee, JNL Series Trust, JNL Investors Series Trust, and JNL Variable Fund LLC (since 2007) and Jackson Variable Series Trust (since 2018); JNL Strategic Income Fund LLC (2007-2018) (open-end mutual funds)**; Trustee, Lewis University (since 2012); formerly Director, Private Bancorp (2003-2017); Executive Vice President and Chief Financial Officer, Van Kampen Investments, Inc. and subsidiaries (investment manager)
Virginia G. Breen, (1964) | ​ | Trustee (since 2015) Term Expires 2022 | ​ | 26 | ​ | Private Investor; Director, Paylocity Holding Corporation (since 2018); Trustee, Neuberger Berman Private Equity Registered Funds (registered private equity funds) (since 2015)***; Trustee, Jones Lang LaSalle Income Property Trust, Inc. (REIT) (since 2004); Director, UBS A&Q Fund Complex (closed-end funds) (since 2008)****; Director, Bank of America/US Trust Company (until 2015)
Lloyd A. Wennlund, (1957) | ​ | Trustee (since 2018) Term Expires 2022 | ​ | 26 | ​ | Trustee and Chairman of the Board, Datum One Series Trust (since 2020) Expert Affiliate, Bates Group, LLC (financial services consulting and expert testimony firm) (since 2018); Executive Vice President, The Northern Trust Company (1989-2017); President and Business Unit Head of Northern Funds and Northern Institutional Funds (1994-2017); Director, Northern Trust Investments (1998-2017); Governor (2004- 2017) and Executive Committee member (2011-2017), Investment Company Institute Board of Governors; Member, Securities Industry Financial Markets Association (SIFMA) Advisory Council, Private Client Services Committee and Private Client Steering Group (2006-2017); Board Member, Chicago Advisory Board of the Salvation Army (2011-2019)
Karen L. Stuckey, (1953) | ​ | Trustee (since 2019) Term Expires 2021 | ​ | 26 | ​ | Member (since 2015) of Desert Mountain Community Foundation Advisory Board (non-profit organization); Partner (1990-2012) of PricewaterhouseCoopers LLP (professional services firm) (held various positions 1975-1990); member of Executive, Nominating and Audit Committees and Chair of Finance Committee (1992-2006), and Emeritus Trustee (since 2007) of Lehigh University; Member, Women’s Investment Management Forum (professional organization) (since inception); formerly, Trustee, Denver Board of Oppenheimer Funds (open-end mutual funds) (2012-2019)
Christopher M. Toub, (1959) | ​ | Trustee (since 2019) Term Expires 2023 | ​ | 26 | ​ | Private investor; formerly, Director of Equities, Alliance Bernstein LP (until 2012)

*Mr. Calamos, Sr. is an “interested person” of the Fund as defined in the 1940 Act because he is an officer of the Fund and an affiliate of Calamos Advisors and CFS.

**Overseeing 161 portfolios in fund complex.

***Overseeing five portfolios in fund complex.

****Overseeing four portfolios in fund complex.

^The Fund Complex consists of Calamos Investment Trust, Calamos Advisors Trust, Calamos Convertible Opportunities and Income Fund, Calamos Convertible and High Income Fund, Calamos Strategic Total Return Fund, Calamos Global Total Return Fund, Calamos Global Dynamic Income Fund, Calamos Dynamic Convertible and Income Fund and Calamos Long/Short Equity & Dynamic Income Trust..

The address of each trustee is 2020 Calamos Court, Naperville, Illinois 60563.

​

CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 57

Trustees and Officers(Unaudited)

Officers. The preceding table gives information about John P. Calamos, Sr., who is Chairman, Trustee and President of the Fund. The following table sets forth each other officer’s name, year of birth, position with the Fund and date first appointed to that position, and principal occupation(s) during the past five years. Each officer serves until his or her successor is chosen and qualified or until his or her resignation or removal by the board of trustees.

NAME AND YEAR OF BIRTH | ​ | POSITION(S) AND LENGTH OF TIME WITH THE FUND | ​ | PRINCIPAL OCCUPATION(S) DURING THE PAST 5 YEARS
John S. Koudounis, (1966) | ​ | Vice President (since 2016) | ​ | Chief Executive Officer, CAM, CILLC, Calamos Advisors, CWM and CFS (since 2016); Director CAM (since 2016); President and Chief Executive Officer (2010-2016), Mizuho Securities USA Inc.
Thomas E. Herman, (1961) | ​ | Vice President (since 2016) and Chief Financial Officer (2016-2017 and since August 2019) | ​ | Chief Financial Officer, CAM, CILLC, Calamos Advisors, and CWM (since 2016); Chi ef Fina ncial Officer and Treasurer, Harris Associates (2010-2016)
Stephen Atkins, (1965) | ​ | Treasurer (since March 2020) | ​ | Senior Vice President, Head of Fund Administration (since February 2020), Calamos Advisors; prior thereto, Consultant, Fund Accounting and Administration, Vx Capital Partners (March 2019-February 2020); Chief Financial Officer and Treasurer of SEC Registered Funds, and Senior Vice President, Head of European Special Purpose Vehicles Accounting and Administration, Avenue Capital Group (2010-2018)
Robert F. Behan, (1964) | ​ | Vice President (since 2013) | ​ | President (since 2015), Head of Global Distribution (since 2013), CAM, CILLC, Calamos Advisors, and CFS; prior thereto Executive Vice President (2013-2015); Senior Vice President (2009-2013), Head of US Intermediary Distribution (2010-2013)
J. Christopher Jackson, (1951) | ​ | Vice President and Secretary (since 2010) | ​ | Senior Vice President, General Counsel and Secretary, CAM, CILLC, Calamos Advisors, CWM and CFS (since 2010); Director, Calamos Global Funds plc (since 2011)
Mark J. Mickey, (1951) | ​ | Chief Compliance Officer (since 2007) | ​ | Chief Compliance Officer, Calamos Funds (since 2005)

The address of each officer is 2020 Calamos Court, Naperville, Illinois 60563.

Results of 2020 Annual Meeting

The Fund held its annual meeting of shareholders on June 29, 2020. The purposes of the annual meeting were (i) to elect two trustees, to be elected by the holders of common shares and the holders of preferred shares, to the Fund’s board of trustees for a three-year term, or until the trustee’s successor is duly elected and qualified; (ii) to elect one trustee, to be elected by the holders of common shares and the holders of preferred shares, to the Fund’s board of trustees for a one-year term, or until the trustee’s successor is duly elected and qualified; (iii) to elect one trustee, to be elected by the holders of the preferred shares, to the Fund’s board of trustees for a three-year term, or until the trustee’s successor is duly elected and qualified; and (iv) to conduct any other lawful business of t he Fu nd.

Mr. John P. Calamos, Sr., was nominated for reelection as trustee by the holders of the common shares and preferred shares, Mr. Christ opher M. Toub was nominated for election as trustee by the holders of the common shares and preferred shares, and Mr. William R. Rybak was nominated for reelection as trustee by the holders of the preferred shares, all for a three-year term until the 2023 annual meeting or until his or her successor is duly elected and qualified; Ms. Karen L. Stuckey was nominated for election as trustee by the holders of the common shares and preferred shares for a one-year term until the 2021 annual meeting or until her successor is duly elected and qualified; and all were elected as such by a plurality vote as follows:

TRUSTEE NOMINEE | VOTES FOR | VOTES WITHHELD | BROKER NON-VOTES AND ABSTENTIONS
John P. Calamos, Sr. | 54,887,450.673 | 828,187 | —
Christopher M. Toub | 54,746,940.673 | 968,697 | —
Karen L. Stuckey | 54,714,041.973 | 1,001,595.7 | —
William R. Rybak | 2,600,000 | — | —

Messrs. Neal and Wennlund and Ms. Breen’s terms of office as trustees continued after the meeting.

​

About Closed-End Funds

58 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT

What is a Closed-End Fund?

A closed-end fund is a publicly traded investment company that raises its initial investment capital through the issuance of a fixed number of shares to investors in a public offering. Shares of a closed-end fund are listed on a stock exchange or traded in the over-the-counter market. Like all investment companies, a closed-end fund is professionally managed and offers investors a unique investment solution based on its investment objective approved by the fund’s Board of Trustees.

Potential Advantages of Closed-End Fund Investing

•Defined Asset Pool Allows Efficient Portfolio Management—Although closed-end fund shares trade actively on a securities exchange, this doesn’t affect the closed-end fund manager because there are no new investors buying into or selling out of the fund’s portfolio.

•More Flexibility in the Timing and Price of Trades—Investors can purchase and sell shares of closed-end funds throughout the trading day, just like the shares of other publicly traded securities.

•Lower Expense Ratios—The expense ratios of closed-end funds are oftentimes less than those of mutual funds. Over time, a lower expense ratio could enhance investment performance.

•Closed-End Structure Makes Sense for Less-Liquid Asset Classes—A closed-end structure makes sense for investors considering less-liquid asset classes, such as high-yield bonds or micro-cap stocks.

•Ability to Put Leverage to Work—Closed-end funds may issue senior securities (such as preferred shares or debentures) or borrow money to “leverage” their investment positions.

•No Minimum Investment Requirements

OPEN-END MUTUAL FUNDS VERSUS CLOSED-END FUNDS

OPEN-END FUND | ​ | CLOSED-END FUND
Issues new shares on an ongoing basis | ​ | Generally issues a fixed number of shares
Issues common equity shares | ​ | Can issue common equity shares and senior securities such as preferred shares and bonds
Sold at NAV plus any sales charge | ​ | Price determined by the marketplace
Sold through the fund’s distributor | ​ | Traded in the secondary market
Fund redeems shares at NAV calculated at the close of business day | ​ | Fund does not redeem shares

You can purchase or sell common shares of closed-end funds daily. Like any other stock, market price will fluctuate with the market. Upon sale, your shares may have a market price that is above or below net asset value and may be worth more or less than your original investment. Shares of closed-end funds frequently trade at a discount, which is a market price that is below their net asset value.

Leverage creates risks which may adversely affect return, including the likelihood of greater volatility of net asset value and market price of common shares and fluctuations in the variable rates of the leverage financing.

Each open-end or closed-end fund should be evaluated individually. Before investing carefully consider the fund’s investment objectives, risks, charges and expenses.

​

Level Rate Distribution Policy

CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT 59

Using a Level Rate Distribution Policy to Promote Dependable Income and Total Return

The goal of the level rate distribution policy is to provide investors a predictable, though not assured, level of cash flow, which can either serve as a stable income stream or, through reinvestment, may contribute significantly to long-term total return.

We understand the importance that investors place on the stability of dividends and their ability to contribute to long-term total return, which is why we have instituted a level rate distribution policy for the Fund. Under the policy, monthly distributions paid may include net investment income, net realized short-term capital gains, and, if necessary, return of capital. In addition, a limited number of distributions per calendar year may include net realized long-term capital gains. There is no guarantee that the Fund will realize capital gains in any given year. Distributions are subject to re-characterization for tax purposes after the end of the fiscal year. All shareholders with taxable accounts will receive written notification regarding the components and tax treatment for distributions via Form 1099-DIV. For purposes of maintaining the level rate distribution policy, the Fund may realize short-term capital gains on securities that, if sold at a later date, would have resulted in long-term capital gains. Maintenance of a level rate distribution policy may increase transaction and tax costs associated with the Fund.

Distributions from the Fund are generally subject to Federal income taxes.

Automatic Dividend Reinvestment Plan

Maximizing Investment with an Automatic Dividend Reinvestment Plan

The Automatic Dividend Reinvestment Plan offers a simple, cost-efficient and convenient way to reinvest your dividends and capital gains distributions in additional shares of the Fund, allowing you to increase your investment in the Fund.

Potential Benefits

•Compounded Growth: By automatically reinvesting with the Plan, you gain the potential to allow your dividends and capital gains to compound over time.

•Potential for Lower Commission Costs: Additional shares are purchased in large blocks, with brokerage commissions shared among all plan participants. There is no cost to enroll in the Plan.

•Convenience: After enrollment, the Plan is automatic and includes detailed statements for participants. Participants can terminate their enrollment at any time.

Pursuant to the Plan, unless a shareholder is ineligible or elects otherwise, all dividend and capital gains on common shares distributions are automatically reinvested by Computershare, as agent for shareholders in administering the Plan (“Plan Agent”), in additional common shares of the Fund. Shareholders who elect not to participate in the Plan will receive all dividends and distributions payable in cash paid by check mailed directly to the shareholder of record (or, if the shares are held in street or other nominee name, then to such nominee) by Plan Agent, as dividend paying agent. Shareholders may elect not to participate in the Plan and to receive all dividends and distributions in cash by sending written instructions to the Plan Agent, as dividend paying agent, at: Dividend Reinvestment Department, P.O. BOX 505000, Louisville, KY 40233. Participation in the Plan is completely voluntary and may be terminated or resumed at any time without penalty by giving notice in writing to the Plan Agent; such termination will be effective with respect to a particular dividend or distribution if notice is received prior to the record date for the applicable distribution.

The shares are acquired by the Plan Agent for the participant’s account either (i) through receipt of additional common shares from the Fund (“newly issued shares”) or (ii) by purchase of outstanding common shares on the open market (“open-market purchases”) on the NASDAQ or elsewhere. If, on the payment date, the net asset value per share of the common shares is equal to or less than the market price per common share plus estimated brokerage commissions (a “market premium”), the Plan Agent will receive newly issued shares from the Fund

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Automatic Dividend Reinvestment Plan

60 CALAMOS GLOBAL DYNAMIC INCOME FUND ANNUAL REPORT

for each participant’s account. The number of newly issued common shares to be credited to the participant’s account will be determined by dividing the dollar amount of the dividend or distribution by the greater of (i) the net asset value per common share on the payment date, or (ii) 95% of the market price per common share on the payment date.

If, on the payment date, the net asset value per common share exceeds the market price plus estimated brokerage commissions (a “market discount”), the Plan Agent has a limited period of time to invest the dividend or distribution amount in shares acquired in open-market purchases. If, before the Plan Agent has completed its open-market purchases, the market price plus estimated brokerage commissions exceeds the net asset value of the common shares as of the payment date, the purchase price paid by Plan Agent may exceed the net asset value of the common shares, resulting in the acquisition of fewer common shares than if such dividend or distribution had been paid in common shares issued by the Fund. The weighted average price (including brokerage commissions) of all common shares purchased by the Plan Agent as Plan Agent will be the price per common share allocable to each participant. If the Plan Agent is unable to invest the full dividend amount in open-market purchases during the purchase period or if the market discount shifts to a market premium during the purchase period, the Plan Agent will cease making open-market purchases and will invest the uninvested portion of the dividend or distribution amount in newly issued shares at the net asset value per common share at the close of business on the last purchase date.

The automatic reinvestment of dividends and distributions will not relieve participants of any federal, state or local income tax that may be payable (or required to be withheld) on such dividends even though no cash is received by participants.

There are no brokerage charges with respect to shares issued directly by the Fund as a result of dividends or distributions payable either in shares or in cash. However, each participant will pay a pro rata share of brokerage commissions incurred with respect to the Plan Agent’s open-market purchases in connection with the reinvestment of dividends or distributions. If a participant elects to have the Plan Agent sell part or all of his or her common shares and remit the proceeds, such participant will be charged his or her pro rata share of brokerage commissions on the shares sold, plus a $15 transaction fee. There is no direct service charge to participants in the Plan; however, the Fund reserves the right to amend the Plan to include a service charge payable by the participants.

A participant may request the sale of all of the common shares held by the Plan Agent in his or her Plan account in order to terminate participation in the Plan. If such participant elects in advance of such termination to have the Plan Agent sell part or all of his shares, the Plan Agent is authorized to deduct from the proceeds a $15.00 fee plus the brokerage commissions incurred for the transaction. A participant may re-enroll in the Plan in limited circumstances.

The terms and conditions of the Plan may be amended by the Plan Agent or the Fund at any time upon notice as required by the Plan.

This discussion of the Plan is only summary, and is qualified in its entirety by the Terms and Conditions of the Dividend Reinvestment Plan filed as part of the Fund’s registration statement.

For additional information about the Plan, please contact the Plan Agent, Computershare, at 866.226.8016. If you wish to participate in the Plan and your shares are held in your own name, simply call the Plan Agent. If your shares are not held in your name, please contact your brokerage firm, bank, or other nomine e to request that they participate in the Plan on your behalf. If your brokerage firm, bank, or other nominee is unable to participate on your behalf, you may request that your shares be re-registered in your own name.

We’re pleased to provide our shareholders with the additional benefit of the Fund’s Dividend Reinvestment Plan and hope that it may serve your financial plan.

​

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MANAGING YOUR CALAMOS
FUNDS INVESTMENTS

Calamos Investments offers several convenient means to monitor, manage and feel confident about your Calamos investment choice.

PERSONAL ASSISTANCE: 800.582.6959

Dial this toll-free number to speak with a knowledgeable Client Services Representative who can help answer questions or address issues concerning your Calamos Fund.

YOUR FINANCIAL ADVISOR

We encourage you to talk to your financial advisor to determine how the Calamos Funds can benefit your investment portfolio based on your financial goals, risk tolerance, time horizon and income needs.

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A description of the Calamos Proxy Voting Policies and Procedures and the Fund’s proxy voting record for the 12-month period ended June 30 are available free of charge upon request by calling 800.582.6959, by visiting the Calamos Web site at w ww.calamos.co m, by writing Calamos at: Calamos Investments, Attn: Client Services, 2020 Calamos Court, Naperville, IL 60563. The Fund’s proxy voting record is also available free of charge by visiting the SEC Web site at www.sec.gov.

The Fund files its complete list of portfolio holdings with the SEC for the first and third quarters each fiscal year as an exhibit to its report on Form N-PORT. The Forms N-PORT are available free of charge, upon request, by calling or writing Calamos Investments at the phone number or address provided above or by visiting the SEC Web site at w ww.sec.g ov. You may also review or, for a fee, copy the forms at the SEC’s Public Reference Room in Washington, D.C. Information on the operation of the Public Reference Room may be obtained by calling 800.732.0330.

The Fund’s report to the SEC on Form N-CSR contains certifications by the fund’s principal executive officer and principal financial officer as required by Rule 30a-2(a) under the 1940 Act, relating to, among other things, the quality of the Fund’s disclosure controls and procedures and internal control over financial reporting.

FOR 24-HOUR AUTOMATED SHAREHOLDER ASSISTANCE: 866.226.8016

TO OBTAIN INFORMATION ABOUT YOUR INVESTMENTS: 800.582.6959

VISIT OUR WEB SITE: www.calamos.com

INVESTMENT ADVISER:

Calamos Advisors LLC
2020 Calamos Court
Naperville, IL 60563-2787

CUSTODIAN AND FUND ACCOUNTING AGENT:

State Street Bank and Trust Company
Boston, MA

TRANSFER AGENT:

Computershare
P.O. BOX 505000

Louisville, KY 40233-5000
866.226.8016

INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM:

Deloitte & Touche LLP
Chicago, IL

LEGAL COUNSEL:

Ropes & Gray
Chicago, IL

2020 Calamos Court

Naperville, IL 60563-2787

800.582.6959

www.calamos.com

© 2020 Calamos Investments LLC. All Rights Reserved.
Calamos® and Calamos Investments® are registered tra demarks of Calam os Investments LLC.

CHWANR 3083 2020

​

ITEM 2. CODE OF ETHICS.

(a) As of the end of the period covered by this report, the registrant has adopted a code of ethics (the “Code of Ethics”) that applies to its principal executive officer, principal financial officer, principal accounting officer or controller, or person performing similar functions.

(b) No response required.

(c) The registrant has not amended its Code of Ethics as it relates to any element of the code of ethics definition enumerated in paragraph(b) of this Item 2 during the period covered by this report.

(d) The registrant has not granted a waiver or an implicit waiver from its Code of Ethics during the period covered by this report.

(e) Not applicable.

(f) (1) The registrant’s Code of Ethics is attached as an Exhibit hereto.

ITEM 3. AUDIT COMMITTEE FINANCIAL EXPERT.

The registrant’s Board of Trustees has determined that, it has five audit committee financial experts serving on its audit committee, each of whom is an independent Trustee for purpose of this N-CSR item: John E. Neal, William R. Rybak, Virginia G. Breen, Karen L. Stuckey and Christopher M. Toub. Under applicable securities laws, a person who is determined to be an audit committee financial expert will not be deemed an “expert” for any purpose, including without limitation for the purposes of Section 11 of the Securities Act of 1933, as a result of being designated or identified as an audit committee financial expert pursuant to this Item. The designation or identification of a person as an audit committee financial expert does not impose on such person any duties, obligations, or liabilities that are greater than the duties, obligations and liabilities imposed on such person as a member of audit committee and board of directors in the absence of such designation or identification. The designation or identification of a person as an audit committee financial expert pursuant to this Item does not affect the duties, obligations, or liabilities of any other member of the audit committee or board of trustees.

ITEM 4. PRINCIPAL ACCOUNTANT FEES AND SERVICES.

Fiscal Years Ended |  | 10/31/2019 |  |  | 10/31/2020 |
Audit Fees (a) |  | $ | 26,784 |  |  | $ | 26,913 |
Audit-Related Fees(b) |  | $ | 3,694 |  |  | $ | 9,351 |
Tax Fees(c) |  | $ | 32,879 |  |  | $ | 60,495 |
All Other Fees(d) |  | $ | — |  |  | $ | — |
Total |  | $ | 63,357 |  |  | $ | 96,759 |

(a) Audit Fees are the aggregate fees billed in each of the last two fiscal years for professional services rendered by the principal accountant to the registrant for the audit of the registrant’s annual financial statements or services that are normally provided by the accountant in connection with statutory and regulatory filings or engagements for those fiscal years.

(b) Audit-Related Fees are the aggregate fees billed in each of the last two fiscal years for assurance and related services rendered by the principal accountant to the registrant that are reasonably related to the performance of the audit of the registrant’s financial statements and are not reported under paragraph (a) of this Item 4.

​

(c) Tax Fees are the aggregate fees billed in each of the last two fiscal years for professional services rendered by the principal accountant to the registrant for tax compliance, tax advice and tax planning.

(d) All Other Fees are the aggregate fees billed in each of the last two fiscal years for products and services provided by the principal accountant to the registrant, other than the services reported in paragraph (a)-(c) of this Item 4.

(e) (1) Registrant’s audit committee meets with the principal accountants and management to review and pre-approve all audit services to be provided by the principal accountants.

The audit committee shall pre-approve all non-audit services to be provided by the principal accountants to the registrant, including the fees and other compensation to be paid to the principal accountants; provided that the pre-approval of non-audit services is waived if (i) the services were not recognized by management at the time of the engagement as non-audit services,(ii) the aggregate fees for all non-audit services provided to the registrant are less than 5% of the total fees paid by the registrant to its principal accountants during the fiscal year in which the non-audit services are provided, and (iii) such services are promptly brought to the attention of the audit committee by management and the audit committee approves them prior to the completion of the audit.

The audit committee shall pre-approve all non-audit services to be provided by the principal accountants to the investment adviser or any entity controlling, controlled by or under common control with the adviser that provides ongoing services to the registrant if the engagement relates directly to the operations or financial reporting of the registrant, including the fees and other compensation to be paid to the principal accountants; provided that pre-approval of non-audit services to the adviser or an affiliate of the adviser is not required if (i) the services were not recognized by management at the time of the engagement as non-audit services, (ii) the aggregate fees for all non-audit services provided to the adviser and all entities controlling, controlled by or under common control with the adviser are less than 5% of the total fees for non-audit services requiring pre-approval under paragraph (e)(1)of this Item 4 paid by the registrant, the adviser or its affiliates to the registrant’s principal accountants during the fiscal year in which the non-audit services are provided, and (iii) such services are promptly brought to the attention of the audit committee by management and the audit committee approves them prior to the completion of the audit.

(e)(2) No percentage of the principal accountant’s fees or services described in each of paragraphs (b)–(d) of this Item were approved pursuant to the waiver provision paragraph (c)(7)(i)(C) of Rule 2-01 of Regulation S-X.

(f) | No disclosures are required by this Item 4(f).

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(g) The following table presents the aggregate non-audit fees billed in each of the last two fiscal years for services rendered by the principal accountant to the registrant and the aggregate non-audit fees billed in each of the last two fiscal years for services rendered by the principal accountant to the investment adviser or any entity controlling, controlled by or under common control of the adviser.

Fiscal Years Ended |  | 10/31/2019 |  |  | 10/31/2020 |
Registrant |  | $ | 32,879 |  |  | $ | 60,495 |
Investment Adviser |  | $ | — |  |  | $ | — |

(h) No disclosures are required by this Item 4(h).

ITEM 5. AUDIT COMMITTEE OF LISTED REGISTRANTS.

The registrant has a separately-designated standing audit committee. The members of the registrant’s audit committee are John E. Neal, William R. Rybak, Virginia G. Breen, Karen L. Stuckey, Christopher M. Toub, and Lloyd Wennlund.

ITEM 6. SCHEDULE OF INVESTMENTS

(a) Included in the Report to Shareholders in Item 1.

(b) Not applicable.

ITEM 7. DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR CLOSED-END MANAGEMENT INVESTMENT COMPANIES.

The registrant has delegated authority to vote all proxies relating to the Fund’s portfolio securities to the Fund’s investment advisor, Calamos Advisors LLC (“Calamos Advisors”). The Calamos Advisors Proxy Voting Policies and Procedures are included as an Exhibit hereto.

ITEM 8. PORTFOLIO MANAGERS OF CLOSED-END MANAGEMENT INVESTMENT COMPANIES.

(a)(1) As of the date of this filing, the registrant is led by a team of investment professionals. The Global Chief Investment Officer and Co-Portfolio Managers are responsible for the day-to-day management of the registrant’s portfolio:

John P. Calamos, Sr. is Chairman, President and Trustee of the Fund and for CALAMOS ADVISORS: Founder, Chairman and Global CIO since August 2016; Chairman and Global CIO from April to August 2016; Chairman, Chief Executive Officer and Global Co-CIO between April 2013 and April 2016; Chief Executive Officer and Global Co-CIO between August 2012 and April 2013; and Chief Executive Officer and Co-CIO prior thereto. R. Matthew Freund joined CALAMOS ADVISORS in November 2016 as a Co-CIO, Head of Fixed Income Strategies, as well as Senior Co-Portfolio Manager. Previously, he was SVP of Investment Portfolio Management and Chief Investment Officer at USAA Investments since 2010. John Hillenbrand joined CALAMOS ADVISORS in 2002 and since September 2015 is a Co-CIO, Head of Multi-Asset Strategies and Co-Head of Convertible Strategies, as well as a Senior Co-Portfolio Manager. From March 2013 to September 2015, he was a Co-Portfolio Manager. Between August 2002 and March 2013, he was a senior strategy analyst. Nick Niziolek joined CALAMOS ADVISORS in March 2005 and has been a Co-CIO, Head of Global Strategies, as well as a Senior Co-Portfolio Manager, since September 2015. Between August 2013 and September 2015 he was a Co-Portfolio Manager, Co-Head of Research. Between March 2013 and August 2013 he was a Co-Portfolio Manager. Between March 2005 and March 2013 he was a senior strategy analyst. Eli Pars joined CALAMOS ADVISORS in May 2013 and has been a Co-CIO, Head of Alternative Strategies and Co-Head of Convertible Strategies, as well as Senior Co-Portfolio Manager, since September 2015. Between May 2013 and September 2015, he was a Co-Portfolio Manager. Previously, he was a Portfolio Manager at Chicago Fundamental Investment Partners from February 2009 to November 2012. Dennis Cogan joined CALAMOS ADVISORS in March 2005 and since March 2013 is a Co-Portfolio Manager. Between March 2005 and March 2013, he was a senior strategy analyst. Jon Vacko joined CALAMOS ADVISORS in June 2000 and has been a Senior Co-Portfolio Manager since September 2015. Previously, he was a Co-Portfolio Manager from August 2013 to September 2015; prior thereto he was a Co-Head of Research and Investments from July 2010 to August 2013. Joe Wysocki joined CALAMOS ADVISORS in October 2003 and since March 2015 is a Co-Portfolio Manager. Previously, he was a sector head from March 2014 to March 2015. Prior thereto, he was a Co-Portfolio Manager from March 2013 to March 2014. Between February 2007 and March 2013, he was a senior strategy analyst.

(a)(2) The portfolio managers also have responsibility for the day-to-day management of accounts other than the registrant. Information regarding these other accounts is set forth below.

​

Other Accounts Managed and Assets by Account Type as of October 31, 2020

|  | Registered |  | Other Pooled |  |  |  |
|  | Investment |  | Investment |  | Other
|  | Companies |  | Vehicles |  | Accounts
|  | Accounts |  | Assets |  | Accounts |  | Assets |  | Accounts |  | Assets
John P. Calamos Sr. |  |  | 23 |  |  |  | 24,298,542,870 |  |  |  | 5 |  |  |  | 779,395,779 |  |  |  | 3,837 |  |  |  | 2,682,004,486 |
R. Matthew Freund |  |  | 16 |  |  |  | 13,197,112,036 |  |  |  | 1 |  |  |  | 385,576,284 |  |  |  | 2,802 |  |  |  | 2,076,815,375 |
John Hillenbrand |  |  | 18 |  |  |  | 11,799,182,233 |  |  |  | 5 |  |  |  | 779,395,779 |  |  |  | 3,824 |  |  |  | 2,672,151,656 |
Nick Niziolek |  |  | 10 |  |  |  | 7,456,407,651 |  |  |  | 4 |  |  |  | 393,819,495 |  |  |  | 2,620 |  |  |  | 1,207,310,422 |
Eli Pars |  |  | 18 |  |  |  | 22,378,323,990 |  |  |  | 5 |  |  |  | 779,395,779 |  |  |  | 2,981 |  |  |  | 2,166,401,113 |
Jon Vacko |  |  | 19 |  |  |  | 12,210,855,267 |  |  |  | 5 |  |  |  | 779,395,779 |  |  |  | 3,824 |  |  |  | 2,672,151,656 |
Dennis Cogan |  |  | 10 |  |  |  | 7,456,407,651 |  |  |  | 4 |  |  |  | 393,819,495 |  |  |  | 2,620 |  |  |  | 1,207,310,422 |
Joe Wysocki |  |  | 12 |  |  |  | 11,471,636,258 |  |  |  | 4 |  |  |  | 777,032,976 |  |  |  | 2,546 |  |  |  | 1,390,018,364 |

Number of Accounts and Assets for which Advisory Fee is Performance Based as of October 31, 2020

|  | Registered |  | Other Pooled |  |  |  |
|  | Investment |  | Investment |  | Other
|  | Companies |  | Vehicles |  | Accounts
|  | Accounts |  | Assets |  | Accounts |  | Assets |  | Accounts |  | Assets
John P. Calamos Sr. |  |  | 2 |  |  |  | 315,830,459 |  |  |  | 0 |  |  |  | — |  |  |  | 0 |  |  |  | — |
R. Matthew Freund |  |  | 0 |  |  |  | — |  |  |  | 0 |  |  |  | — |  |  |  | 0 |  |  |  | — |
John Hillenbrand |  |  | 2 |  |  |  | 315,830,459 |  |  |  | 0 |  |  |  | — |  |  |  | 0 |  |  |  | — |
Nick Niziolek |  |  | 2 |  |  |  | 315,830,459 |  |  |  | 0 |  |  |  | — |  |  |  | 0 |  |  |  | — |
Eli Pars |  |  | 2 |  |  |  | 315,830,459 |  |  |  | 0 |  |  |  | — |  |  |  | 0 |  |  |  | — |
Jon Vacko |  |  | 2 |  |  |  | 315,830,459 |  |  |  | 0 |  |  |  | — |  |  |  | 0 |  |  |  | — |
Dennis Cogan |  |  | 2 |  |  |  | 315,830,459 |  |  |  | 0 |  |  |  | — |  |  |  | 0 |  |  |  | — |
Joe Wysocki |  |  | 0 |  |  |  | — |  |  |  | 0 |  |  |  | — |  |  |  | 0 |  |  |  | — |

​

The registrant’s portfolio managers are responsible for managing the registrant and other accounts, including separate accounts and unregistered funds.

(a)(2) Other than potential conflicts between investment strategies, the side-by-side management of both the Fund and other accounts may raise potential conflicts of interest due to the interest held by Calamos Advisors in an account and certain trading practices used by the portfolio managers (e.g., cross trades between the Fund and another account and allocation of aggregated trades). Calamos Advisors has developed policies and procedures reasonably designed to mitigate those conflicts. For example, Calamos Advisors will only place cross-trades in securities held by the Fund in accordance with the rules promulgated under the 1940 Act and has adopted policies designed to ensure the fair allocation of securities purchased on an aggregated basis.

The allocation methodology employed by Calamos Advisors varies depending on the type of securities sought to be bought or sold and the type of client or group of clients. Generally, however, orders are placed first for those clients that have given Calamos Advisors brokerage discretion (including the ability to step out a portion of trades), and then to clients that have directed Calamos Advisors to execute trades through a specific broker. However, if the directed broker allows Calamos Advisors to execute with other brokerage firms, which then book the transaction directly with the directed broker, the order will be placed as if the client had given Calamos Advisors full brokerage discretion. Calamos Advisors and its affiliates frequently use a “rotational” method of placing and aggregating client orders and will build and fill a position for a designated client or group of clients before placing orders for other clients. A client account may not receive an allocation of an order if: (a) the client would receive an unmarketable amount of securities based on account size; (b) the client has precluded Calamos Advisors from using a particular broker; (c) the cash balance in the client account will be insufficient to pay for the securities allocated to it at settlement; (d) current portfolio attributes make an allocation inappropriate; and (e) account specific guidelines, objectives and other account specific factors make an allocation inappropriate. Allocation methodology may be modified when strict adherence to the usual allocation is impractical or leads to inefficient or undesirable results. Calamos Advisors’ head trader must approve each instance that the usual allocation methodology is not followed and provide a reasonable basis for such instances and all modifications must be reported in writing to the Calamos Advisors’ Chief Compliance Officer on a monthly basis.

Investment opportunities for which there is limited availability generally are allocated among participating client accounts pursuant to an objective methodology (i.e., either on a pro rata basis or using a rotational method, as described above). However, in some instances, Calamos Advisors may consider subjective elements in attempting to allocate a trade, in which case the Fund may not participate, or may participate to a lesser degree than other clients, in the allocation of an investment opportunity. In considering subjective criteria when allocating trades, Calamos Advisors is bound by its fiduciary duty to its clients to treat all client accounts fairly and equitably.

The Co-Portfolio Managers advise certain accounts under a performance fee arrangement. A performance fee arrangement may create an incentive for a Co-Portfolio Manager to make investments that are riskier or more speculative than would be the case in the absence of performance fees. A performance fee arrangement may result in increased compensation to the Co-Portfolio Managers from such accounts due to unrealized appreciation as well as realized gains in the client’s account.

(a)(3) As of October 31, 2020, John P. Calamos, Sr., our Global CIO, aside from distributions arising from his ownership from various entities, receives all of his compensation from Calamos. He has entered into an employment agreement that provides for compensation in the form of an annual base salary and a target bonus, both components payable in cash. His target bonus is set at a percentage of the respective base salary. Similarly, Mr. Calamos is eligible for a Long-Term Incentive (“LTI”). The LTI program at Calamos currently consists of two types of awards: (1) Mutual Fund Incentive Awards for investment professionals and (2) Phantom Equity Incentive Awards for non-investment professionals.

As of October 31, 2020, R. Matthew Freund, John Hillenbrand, Nick Niziolek, Eli Pars, Jon Vacko, Dennis Cogan, and Joe Wysocki receive all of their compensation from Calamos. These individuals each receive compensation in the form of an annual base salary, a bonus (payable in cash) and are eligible for LTI awards. Each of these individuals is also eligible for discretionary LTI awards based on individual and collective performance, however these awards are not guaranteed from year to year. The LTI program at Calamos for investment professionals is a Mutual Fund Incentive Award with amounts deemed to be invested in one or more funds. “Funds” mean mutual funds, ETFs or private funds managed by Calamos or a subsidiary of Calamos.

The amounts paid to all Co-Portfolio Managers and the criteria utilized to determine the amounts are benchmarked against industry specific data provided by third party analytical agencies. The Co-Portfolio Managers' compensation structure does not differentiate between the Funds and other accounts managed by the Co-Portfolio Managers, and is determined on an overall basis, taking into consideration annually the performance of the various strategies managed by the Co-Portfolio Managers. Portfolio performance is utilized as one factor in determining the annual discretionary bonus, as well as overall performance of Calamos.

​

(a)(4) As of October 31, 2020, the end of the registrant’s most recently completed fiscal year, the dollar range of securities beneficially owned by each portfolio manager in the registrant is shown below:

Portfolio Manager |  | Registrant
John P. Calamos, Sr. |  | $100,001 - $500,000
R. Matthew Freund |  | None
John Hillenbrand |  | None
Nick Niziolek |  | None
Eli Pars |  | None
Jon Vacko |  | None
Dennis Cogan |  | None
Joe Wysocki |  | None

(b) | Not applicable.

ITEM 9. PURCHASES OF EQUITY SECURITIES BY CLOSED-END MANAGEMENT INVESTMENT COMPANY AND AFFILIATED PURCHASERS.

Not applicable

ITEM 10. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.

No material changes.

ITEM 11. CONTROLS AND PROCEDURES.

a) The registrant’s principal executive officer and principal financial officer have evaluated the registrant’s disclosure controls and procedures within 90 days of this filing and have concluded that the registrant’s disclosure controls and procedures were effective, as of that date, in ensuring that information required to be disclosed by the registrant in this Form N-CSR was recorded, processed, summarized, and timely reported.

b) There were no changes in the registrant’s internal controls over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940) that occurred during the period covered by this report that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting.

ITEM 12. Disclosure of Securities Lending Activities for Closed-End Management Investment Companies.

(a) Securities Lending Activities

(1) Gross income from securities lending activities: $0

(2) Fees and/or compensation for:

Any share of revenue generated by the securities lending program paid to the securities lending agent: $0

Rebates paid to borrower: $0

(3) Aggregate fees and/or compensation $0

(4) Net income from securities lending activities: $0

(b) Under the terms of an Amended and Restated Liquidity Agreement (the “Agreement”) with State Street Bank and Trust Company (“SSB”), all securities lent through SSB must be secured continuously by collateral received in cash. Cash collateral held by SSB on behalf of the Fund may be credited against the amounts borrowed under the Agreement. Any amounts credited against borrowings under the Agreement would count against the Fund's leverage limitations under the 1940 Act, unless otherwise covered in accordance with SEC Release IC-10666. Under the terms of the Agreement, SSB will return the value of the collateral to the borrower at the termination of the selected securities loan(s), which will eliminate the credit against the borrowings under the Agreement and will cause the amount drawn under the Agreement to increase in an amount equal to the returned collateral. The Fund is obligated to make payment to the entity in the event SSB is unable to return the value of the collateral. The Fund would continue to be entitled to receive the equivalent of the interest or dividends paid by the issuer on the securities loaned. The Fund may pay reasonable fees to persons unaffiliated with the Fund for services in arranging these loans. The Fund has the right to call a loan and obtain the securities loaned at any time.

ITEM 13. EXHIBITS.

(a)(1) Code of Ethics

(a)(2)(i) Certification of Principal Executive Officer.

(a)(2)(ii) Certification of Principal Financial Officer.

(a)(2)(iii) Proxy Voting Policies and Procedures.

​

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Calamos Global Dynamic Income Fund
By: | /s/ John P. Calamos, Sr.
Name: |  |  |  | John P. Calamos, Sr.
Title: |  |  |  | Principal Executive Officer
Date: |  |  |  | December 29, 2020
By: | /s/ Thomas E. Herman
Name: |  |  |  | Thomas E. Herman
Title: |  |  |  | Principal Financial Officer
Date: |  |  |  | December 29, 2020

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

By: | /s/ John P. Calamos, Sr.
Name: |  |  |  | John P. Calamos, Sr.
Title: |  |  |  | Principal Executive Officer
Date: |  |  |  | December 29, 2020
By: | /s/ Thomas E. Herman
Name: |  |  |  | Thomas E. Herman
Title: |  |  |  | Principal Financial Officer
Date: |  |  |  | December 29, 2020