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N-2 - USD ($) |  |  | 3 Months Ended
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May 23, 2025 | May 16, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023
Cover [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Entity Central Index Key |  | 0001528988 |  |  |  |  |  |  |  |  |  |
Amendment Flag |  | false |  |  |  |  |  |  |  |  |  |
Entity Inv Company Type |  | N-2 |  |  |  |  |  |  |  |  |  |
Securities Act File Number |  | 333-285516 |  |  |  |  |  |  |  |  |  |
Investment Company Act File Number |  | 811-22606 |  |  |  |  |  |  |  |  |  |
Document Type |  | N-2/A |  |  |  |  |  |  |  |  |  |
Document Registration Statement |  | true |  |  |  |  |  |  |  |  |  |
Pre-Effective Amendment |  | true |  |  |  |  |  |  |  |  |  |
Pre-Effective Amendment Number |  | 1 |  |  |  |  |  |  |  |  |  |
Post-Effective Amendment |  | false |  |  |  |  |  |  |  |  |  |
Investment Company Act Registration |  | true |  |  |  |  |  |  |  |  |  |
Investment Company Registration Amendment |  | true |  |  |  |  |  |  |  |  |  |
Investment Company Registration Amendment Number |  | 14 |  |  |  |  |  |  |  |  |  |
Entity Registrant Name |  | BlackRock Utilities, Infrastructure & Power Opportunities Trust |  |  |  |  |  |  |  |  |  |
Entity Address, Address Line One |  | 100 Bellevue Parkway |  |  |  |  |  |  |  |  |  |
Entity Address, City or Town |  | Wilmington |  |  |  |  |  |  |  |  |  |
Entity Address, State or Province |  | DE |  |  |  |  |  |  |  |  |  |
Entity Address, Postal Zip Code |  | 19809 |  |  |  |  |  |  |  |  |  |
City Area Code |  | 800 |  |  |  |  |  |  |  |  |  |
Local Phone Number |  | 882-0052 |  |  |  |  |  |  |  |  |  |
Approximate Date of Commencement of Proposed Sale to Public |  | From time to time after the effective date of this Registration Statement. |  |  |  |  |  |  |  |  |  |
Dividend or Interest Reinvestment Plan Only |  | false |  |  |  |  |  |  |  |  |  |
Delayed or Continuous Offering |  | true |  |  |  |  |  |  |  |  |  |
Primary Shelf [Flag] |  | true |  |  |  |  |  |  |  |  |  |
Effective Upon Filing, 462(e) |  | false |  |  |  |  |  |  |  |  |  |
Additional Securities Effective, 413(b) |  | false |  |  |  |  |  |  |  |  |  |
Effective when Declared, Section 8(c) |  | false |  |  |  |  |  |  |  |  |  |
New Effective Date for Previous Filing |  | false |  |  |  |  |  |  |  |  |  |
Additional Securities. 462(b) |  | false |  |  |  |  |  |  |  |  |  |
No Substantive Changes, 462(c) |  | false |  |  |  |  |  |  |  |  |  |
Exhibits Only, 462(d) |  | false |  |  |  |  |  |  |  |  |  |
Registered Closed-End Fund [Flag] |  | true |  |  |  |  |  |  |  |  |  |
Business Development Company [Flag] |  | false |  |  |  |  |  |  |  |  |  |
Interval Fund [Flag] |  | false |  |  |  |  |  |  |  |  |  |
Primary Shelf Qualified [Flag] |  | true |  |  |  |  |  |  |  |  |  |
Entity Well-known Seasoned Issuer |  | No |  |  |  |  |  |  |  |  |  |
Entity Emerging Growth Company |  | false |  |  |  |  |  |  |  |  |  |
New CEF or BDC Registrant [Flag] |  | false |  |  |  |  |  |  |  |  |  |
Fee Table [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Shareholder Transaction Expenses [Table Text Block] |  |
Shareholder Transaction Expenses |  |  |  |
Sales load paid by you (as a percentage of offering price)(1) |  |  | 1.00% |
Offering expenses borne by the Trust (as a percentage of offering price)(1) |  |  | 0.02% |
Dividend reinvestment plan fees |  |  | $0.02 per share for open‑market purchases of common shares(2) |
Dividend reinvestment plan sale transaction fee |  |  | $2.50(2) |
(1) | If the common shares are sold to or through underwriters, the Prospectus Supplement will set forth any applicable sales load and the estimated offering expenses. Trust shareholders will pay all offering expenses involved with an offering.
(2) | The Reinvestment Plan Agent’s (as defined below under “Dividend Reinvestment Plan”) fees for the handling of the reinvestment of dividends will be paid by the Trust. However, you will pay a $0.02 per share fee incurred in connection with open-market purchases, which will be deducted from the value of the dividend. You will also be charged a $2.50 sales fee and pay a $0.15 per share fee if you direct the Reinvestment Plan Agent to sell your common shares held in a dividend reinvestment account. Per share fees include any applicable brokerage commissions the Reinvestment Plan Agent is required to pay.
Sales Load [Percent] | [1] | 1.00% |  |  |  |  |  |  |  |  |  |
Dividend Reinvestment and Cash Purchase Fees | [2] | $ 2.50 |  |  |  |  |  |  |  |  |  |
Other Transaction Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Other Transaction Expenses [Percent] | [1] | 0.02% |  |  |  |  |  |  |  |  |  |
Annual Expenses [Table Text Block] |  |
Estimated Annual Expenses (as a percentage of net assets attributable to common shares) |  |  |  |
Management Fees(3)(5) |  |  | 1.00% |
Other Expenses(4) |  |  | 0.08% |
Total Annual Expenses |  |  | 1.08% |
Fee Waivers and/or Expense Reimbursements(5) |  |  | — |
Total Annual Expenses after Fee Waivers and/or Expense Reimbursements(5) |  |  | 1.08% |
(3) | The Advisor receives an annual fee, payable monthly, in a maximum amount equal to 1.00% of the average daily value of the net assets of the Trust.
(4) | “Other Expenses” are based on estimated amounts for the current fiscal year.
(5) | The Trust and the Advisor have entered into a fee waiver agreement (the “Fee Waiver Agreement”), pursuant to which the Advisor has contractually agreed to waive the management fee with respect to any portion of the Trust’s assets attributable to investments in any equity and fixed-income mutual funds and exchange-traded funds (“ETFs”) managed by the Advisor or its affiliates and other exchange-traded products sponsored by the Advisor or its affiliates, in each case that have a contractual management fee, through June 30, 2027. In addition, pursuant to the Fee Waiver Agreement, the Advisor has contractually agreed to waive its management fees by the amount of investment advisory fees the Trust pays to the Advisor indirectly through its investment in money market funds managed by the Advisor or its affiliates, through June 30, 2027. The Fee Waiver Agreement may be terminated at any time, without the payment of any penalty, only by the Trust (upon the vote of a majority of the Trustees who are not “interested persons” (as defined in the Investment Company Act) of the Trust (the “Independent Trustees”) or a majority of the outstanding voting securities of the Trust), upon 90 days’ written notice by the Trust to the Advisor.
Management Fees [Percent] | [3],[4] | 1.00% |  |  |  |  |  |  |  |  |  |
Other Annual Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Other Annual Expenses [Percent] | [5] | 0.08% |  |  |  |  |  |  |  |  |  |
Total Annual Expenses [Percent] |  | 1.08% |  |  |  |  |  |  |  |  |  |
Waivers and Reimbursements of Fees [Percent] | [4] |  |  |  |  |  |  |  |  |  |  |
Net Expense over Assets [Percent] | [4] | 1.08% |  |  |  |  |  |  |  |  |  |
Expense Example [Table Text Block] |  | The following example illustrates the expenses (including the sales load of $10.00 and offering costs of $0.20 that you would pay on a $1,000 investment in common shares, assuming (i) total net annual expenses of 1.08% of net assets attributable to common shares, and (ii) a 5% annual return:
|  | One Year |  |  | Three Years |  |  | Five Years |  |  | Ten Years |
Total expenses incurred |  | $ | 21 |  |  | $ | 44 |  |  | $ | 69 |  |  | $ | 141 |
The example should not be considered a representation of future expenses. The example assumes that the “Other Expenses” set forth in the Estimated Annual Expenses table are accurate and that all dividends and distributions are reinvested at NAV. Actual expenses may be greater or less than those assumed. Moreover, the Trust’s actual rate of return may be greater or less than the hypothetical 5% return shown in the example. |  |  |  |  |  |  |  |  |  |
Expense Example, Year 01 |  | $ 21 |  |  |  |  |  |  |  |  |  |
Expense Example, Years 1 to 3 |  | 44 |  |  |  |  |  |  |  |  |  |
Expense Example, Years 1 to 5 |  | 69 |  |  |  |  |  |  |  |  |  |
Expense Example, Years 1 to 10 |  | $ 141 |  |  |  |  |  |  |  |  |  |
Basis of Transaction Fees, Note [Text Block] |  | as a percentage of offering price |  |  |  |  |  |  |  |  |  |
Other Transaction Fees, Note [Text Block] |  | The Reinvestment Plan Agent’s (as defined below under “Dividend Reinvestment Plan”) fees for the handling of the reinvestment of dividends will be paid by the Trust. However, you will pay a $0.02 per share fee incurred in connection with open-market purchases, which will be deducted from the value of the dividend. You will also be charged a $2.50 sales fee and pay a $0.15 per share fee if you direct the Reinvestment Plan Agent to sell your common shares held in a dividend reinvestment account. Per share fees include any applicable brokerage commissions the Reinvestment Plan Agent is required to pay. |  |  |  |  |  |  |  |  |  |
Other Expenses, Note [Text Block] |  | The example should not be considered a representation of future expenses. The example assumes that the “Other Expenses” set forth in the Estimated Annual Expenses table are accurate and that all dividends and distributions are reinvested at NAV. Actual expenses may be greater or less than those assumed. Moreover, the Trust’s actual rate of return may be greater or less than the hypothetical 5% return shown in the example. |  |  |  |  |  |  |  |  |  |
Management Fee not based on Net Assets, Note [Text Block] |  | The Advisor receives an annual fee, payable monthly, in a maximum amount equal to 1.00% of the average daily value of the net assets of the Trust. |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Investment Objectives and Practices [Text Block] |  | THE TRUST’S INVESTMENTS Investment Objective and Policies Please refer to the section of the Trust’s most recent annual report on Form N-CSR entitled “Investment Objectives, Policies and Risks—Investment Objectives and Policies—BlackRock Utilities, Infrastructure & Power Opportunities Trust (BUI)”, which is incorporated by reference herein, for a discussion of the Trust’s investment objective and policies. Portfolio Contents and Techniques The Trust’s portfolio will be composed principally of the following investments. Additional information with respect to the Trust’s investment policies and restrictions and certain of the Trust’s portfolio investments is contained in the SAI. There is no guarantee the Trust will buy all of the types of securities or use all of the investment techniques that are described herein and in the SAI. Equity Securities. The Trust invests in equity securities, including common stocks, preferred stocks, convertible securities, warrants, depositary receipts, ETFs and equity interests in real estate investment trusts (“REITs”), Canadian Royalty Trusts and master limited partnerships (“MLPs”). Common stock represents an equity ownership interest in a company. The Trust may hold or have exposure to common stocks of issuers of any size, including small and medium capitalization stocks. Because the Trust will ordinarily have exposure to common stocks, historical trends would indicate that the Trust’s portfolio and investment returns will be subject at times, and over time, to higher levels of volatility and market and issuer-specific risk than if it invested exclusively in debt securities. The Trust intends to also employ a strategy, as described below, of writing call and put options on common stocks. Utilities, Infrastructure and Power Opportunities Issuers. Under normal market conditions, the Trust will invest at least 80% of its total assets in equity securities issued by Utilities, Infrastructure or Power Opportunities issuers. For purposes of the 80% policy above, a company is considered to be engaged in these business segments if: (i) at least 50% of its assets, income, sales or profits are committed to or derived from one or all of the Utilities, Infrastructure or Power Opportunities business segments; or (ii) a third party classification (such as (a) Standard Industry Classifications and the North American Industry Classification System, each of which is published by the Executive Office of the President, Office of Management and Budget, and (b) classifications by one or more third party data providers including, without limitation, Bloomberg L.P., FactSet Research Systems Inc. and MSCI Barra) has given the company an industry or sector classification consistent with the Utilities, Infrastructure or Power Opportunities business segments. Companies engaged in the Utilities, Infrastructure or Power Opportunities business segments can be generally categorized as engaging in, related to or involved with:
| ● |  | the generation, transmission, sale or distribution of electric energy;
| ● |  | the distribution, purification and treatment of water;
| ● |  | the production, transmission or distribution of natural resources used to produce energy, such as oil, natural gas and coal;
| ● |  | the provision of communications services, including cable television, satellite, microwave, radio, telephone and other communications media (e.g., fixed-base wireless transmission towers and broadband television cable);
| ● |  | the management, ownership or operation of infrastructure assets;
| ● |  | the construction, development, distribution or financing of infrastructure assets; or
| ● |  | the adoption, development and generation of power and energy sources.
The Trust generally considers “infrastructure assets” to consist of those assets which provide the underlying foundation of basic services, facilities and institutions upon which the growth and development of a community depends, including physical structures, networks and systems of transportation, energy, water and sewage, and communication. Categories of infrastructure assets currently include:
| ● |  | Assets that are natural or near-natural monopolies and are regulated in the level of revenue earned or charges imposed. Examples include certain power and gas transmission, generation and distribution assets and water and waste-water distribution and treatment facilities.
| ● |  | Assets that depend on a form of user pay system for their main revenue source. Examples include toll roads, bridges, tunnels, airports, railways, seaports and parking lots.
| ● |  | Assets that provide basic social services to the community. Examples include schools, hospitals and correction facilities.
| ● |  | Assets that compete in a market for the sale of a product or service and are therefore exposed to market risks. Examples include certain solid waste disposal facilities and certain communication asset classes, including communications towers, satellites and transmission lines.
Other types of infrastructure assets include assets related to the development and distribution of coal, steel and iron ore, gold and other precious metals, building materials, agricultural commodities and food and the gathering, treating, processing, fractionation, transportation and storage of hydrocarbon products. Historically, Utilities, Infrastructure and Power Opportunities companies have generally paid dividends on their equity securities. Non-U.S. Securities. The Trust may invest in Non-U.S. Securities. These securities may be U.S. dollar-denominated or non-U.S. dollar-denominated. Some Non-U.S. Securities may be less liquid and more volatile than securities of comparable U.S. issuers. Similarly, there is less volume and liquidity in most foreign securities markets than in the United States and, at times, greater price volatility than in the United States. Because evidence of ownership of such securities usually is held outside the United States, the Trust will be subject to additional risks if it invests in Non-U.S. Securities, which include adverse political and economic developments, seizure or nationalization of foreign deposits and adoption of governmental restrictions which might adversely affect or restrict the payment of principal and interest or dividends on the foreign securities to investors located outside the country of the issuer, whether from currency blockage or otherwise. Non-U.S. Securities may trade on days when the common shares are not priced or traded. Emerging Markets Investments. The Trust may invest in securities of issuers located in emerging market countries, including securities denominated in currencies of emerging market countries. Emerging market countries generally include every nation in the world except the United States, Canada, Japan, Australia, New Zealand and most countries located in Western Europe. These issuers may be subject to risks that do not apply to issuers in larger, more developed countries. These risks are more pronounced to the extent the Trust invests significantly in one country. Less information about emerging market issuers or markets may be available due to less rigorous disclosure and accounting standards or regulatory practices. Emerging markets are smaller, less liquid and more volatile than U.S. markets. In a changing market, the Advisors may not be able to sell the Trust’s portfolio securities in amounts and at prices they consider reasonable. The U.S. dollar may appreciate against non-U.S. currencies or an emerging market government may impose restrictions on currency conversion or trading. The economies of emerging market countries may grow at a slower rate than expected or may experience a downturn or recession. Economic, political and social developments may adversely affect non-U.S. securities markets. Options. An option on a security is a contract that gives the holder of the option, in return for a premium, the right to buy from (in the case of a call) or sell to (in the case of a put) the writer of the option the security underlying the option at a specified exercise or “strike” price. The writer of an option on a security has the obligation upon exercise of the option to deliver the underlying security upon payment of the exercise price or to pay the exercise price upon delivery of the underlying security. Certain options, known as “American style” options may be exercised at any time during the term of the option. Other options, known as “European style” options, may be exercised only on the expiration date of the option. As the writer of an option, the Trust would effectively add leverage to its portfolio because, in addition to its Managed Assets, the Trust would be subject to investment exposure on the value of the assets underlying the option. If an option written by the Trust expires unexercised, the Trust realizes on the expiration date a capital gain equal to the premium received by the Trust at the time the option was written. If an option purchased by the Trust expires unexercised, the Trust realizes a capital loss equal to the premium paid. Prior to the earlier of exercise or expiration, an exchange-traded option may be closed out by an offsetting purchase or sale of an option of the same series (type, underlying security, exercise price and expiration). There can be no assurance, however, that a closing purchase or sale transaction can be effected when the Trust desires. The Trust may sell call or put options it has previously purchased, which could result in a net gain or loss depending on whether the amount realized on the sale is more or less than the premium and other transaction costs paid on the call or put option when purchased. The Trust will realize a capital gain from a closing purchase transaction if the cost of the closing transaction is less than the premium received from writing the option, or, if it is more, the Trust will realize a capital loss. If the premium received from a closing sale transaction is more than the premium paid to purchase the option, the Trust will realize a capital gain or, if it is less, the Trust will realize a capital loss. Net gains from the Trust’s options strategy will be short-term capital gains which, for U.S. federal income tax purposes, will constitute net investment company taxable income. Call Options. The Trust intends to follow a call options writing strategy intended to generate current gains from options premiums and to enhance the Trust’s risk-adjusted returns. The strategy involves writing both covered and other call options. A call option written by the Trust on a security is considered a covered call option where the Trust owns the security underlying the call option. Unlike a written covered call option, other written options will not provide the Trust with any potential appreciation on an underlying security to offset any loss the Trust may experience if the option is exercised. As the Trust writes covered call options on its portfolio, it may not be able to benefit from capital appreciation on the underlying securities, as the Trust will lose its ability to benefit from such capital appreciation to the extent that it writes covered call options and the securities on which it writes these options appreciate above the exercise prices of the options. Therefore, at times, the Advisors may choose to decrease the use of a covered call options writing strategy to the extent that it may negatively impact the Trust’s ability to benefit from capital appreciation. For any written call option where the Trust does not own the underlying security, the Trust may have an absolute and immediate right to acquire that security upon conversion or exchange of other securities held by the Trust without additional cash consideration (or, if additional cash consideration is required, cash or liquid securities in such amount are segregated on the Trust’s books) or the Trust may hold a call on the same security where the exercise price of the call held is (i) equal to or less than the exercise price of the call written, or (ii) greater than the exercise price of the call written, provided cash or liquid securities in an amount equal to the difference is segregated on the Trust’s books. The standard contract size for a single exchange-listed option is 100 shares of the common stock. There are four items needed to identify any option: (1) the underlying security, (2) the expiration month, (3) the strike price and (4) the type (call or put). For example, ten XYZ Co. October 40 call options provide the right to purchase 1,000 shares of XYZ Co. on or before a specified date in October at $40.00 per share. A call option whose strike price is above the current price of the underlying stock is called “out-of-the-money.” Most of the options that will be sold by the Trust are expected to be out-of-the-money, allowing for potential appreciation in addition to the proceeds from the sale of the option. An option whose strike price is below the current price of the underlying stock is called “in-the-money” and could be sold by the Trust as a defensive measure to protect against a possible decline in the underlying stock. The following is a conceptual example of a covered call transaction, making the following assumptions: (1) a common stock currently trading at $37.15 per share; (2) a six-month call option is written with a strike price of $40.00 (i.e., 7.7% higher than the current market price); and (3) the writer receives $2.45 (or 6.6%) of the common stock’s value as a premium. This example is not meant to represent the performance of any actual common stock, option contract or the Trust itself and does not reflect any transaction costs of entering into or closing out the option position. Under this scenario, before giving effect to any change in the price of the stock, the covered call writer receives the premium, representing 6.6% of the common stock’s value, regardless of the stock’s performance over the six-month period until option expiration. If the stock remains unchanged, the option will expire and there would be a 6.6% return for the six-month period. If the stock were to decline in price by 6.6%, the strategy would “break-even” thus offering no gain or loss. See “Tax Matters—Taxation of the Trust—The Trust’s Investments.” If the stock were to climb to a price of $40.00 or above, the option would be exercised and the stock would return 7.7% coupled with the option premium of 6.6% for a total return of 14.3%. Under this scenario, the investor would not benefit from any appreciation of the stock above $40.00, and thus be limited to a 14.3% total return. The premium from writing the covered call option serves to offset some of the unrealized loss on the stock in the event that the price of the stock declines, but if the stock were to decline more than 6.6% under this scenario, the investor does not have protection from further declines and the stock could eventually become worthless. For conventional exchange-listed call options, the option’s expiration date can be up to nine months from the date the call options are first listed for trading. Longer-term call options can have expiration dates up to three years from the date of listing. It is anticipated that, under certain circumstances when deemed at the Advisors’ discretion to be in the best interest of the Trust, options that are written against Trust stock holdings will be repurchased in a closing transaction prior to the option’s expiration date, generating a gain or loss in the options. If the options were not to be repurchased, the option holder would exercise their rights and buy the stock from the Trust at the strike price if the stock traded at a higher price than the strike price. In general, when deemed at the Advisors’ discretion to be in the best interests of the Trust, the Trust may enter into transactions, including closing transactions, that would allow it to continue to hold its common stocks rather than allowing them to be called away by the option holders. Put Options. Put options are contracts that give the holder of the option, in return for a premium, the right to sell to the writer of the option the security underlying the option at a specified exercise price at any time during the term of the option. Put option strategies may produce a higher return than covered call writing, but may involve a higher degree of risk and potential volatility. The following is a conceptual example of a put transaction, making the following assumptions: (1) a common stock currently trading at $37.15 per share; (2) a six-month put option written with a strike price of $35.00 (i.e., 94.21% of the current market price); and (3) the writer receives $1.10 or 2.96% of the common stock’s value as a premium. This example is not meant to represent the performance of any actual common stock, option contract or the Trust itself and does not reflect any transaction costs of entering into or closing out the option position. Under this scenario, before giving effect to any change in the price of the stock, the put writer receives the premium, representing 2.96% of the common stock’s value, regardless of the stock’s performance over the six-month period until the option expires. If the stock remains unchanged, appreciates in value or declines less than 5.79% in value, the option will expire and there would be a 2.96% return for the six-month period. If the stock were to decline by 5.79% or more, the Trust would lose an amount equal to the amount by which the stock’s price declined minus the premium paid to the Trust. The stock’s price could lose its entire value, in which case the Trust would lose $33.90 ($35.00 minus $1.10). Options on Indices. The Trust may write index call and put options. Because “index options” includes both options on indices of securities and sectors of securities, all types of index options generally have similar characteristics. Index options differ from options on individual securities because (i) the exercise of an index option requires cash payments and does not involve the actual purchase or sale of securities, (ii) the holder of an index option has the right to receive cash upon exercise of the option if the level of the index upon which the option is based is greater, in the case of a call, or less, in the case of a put, than the exercise price of the option and (iii) index options reflect price fluctuations in a group of securities or segments of the securities market rather than price fluctuations in a single security. As the writer of an index call or put option, the Trust receives cash (the premium) from the purchaser. The purchaser of an index call option has the right to any appreciation in the value of the index over a fixed price (the exercise price) on or before a certain date in the future (the expiration date). The purchaser of an index put option has the right to any depreciation in the value of the index below a fixed price (the exercise price) on or before a certain date in the future (the expiration date). The Trust, in effect, agrees to sell the potential appreciation (in the case of a call) or accept the potential depreciation (in the case of a put) in the value of the relevant index in exchange for the premium. If, at or before expiration, the purchaser exercises the call or put option written by the Trust, the Trust will pay the purchaser the difference between the cash value of the index and the exercise price of the index option. The premium, the exercise price and the market value of the index determine the gain or loss realized by the Trust as the writer of the index call or put option. The Trust may execute a closing purchase transaction with respect to an index option it has sold and write another option (with either a different exercise price or expiration date or both). The Trust’s objective in entering into such a closing transaction will be to optimize net index option premiums. The cost of a closing transaction may reduce the net index option premiums realized from writing the index option. Limitation on Options Writing Strategy. The Trust may write put and call options, the notional amount of which would be approximately 30% to 40% of the Trust’s total assets, although this percentage may vary from time to time with market conditions. Under current market conditions, the Trust anticipates writing put and call options, the notional amount of which would be approximately 33% of the Trust’s total assets. The Trust generally writes options that are “out of the money” — in other words, the strike price of a written call option will be greater than the market price of the underlying security on the date that the option is written, or, for a written put option, less than the market price of the underlying security on the date that the option is written; however, the Trust may also write “in the money” options for defensive or other purposes. The number of put and call options on securities the Trust can write is limited by the total assets the Trust holds. The Trust’s exchange-listed option transactions will be subject to limitations established by each of the exchanges, boards of trade or other trading facilities on which such options are traded and cleared. These limitations govern the maximum number of options in each class which may be written or purchased by a single investor or group of investors acting in concert, regardless of whether the options are written or purchased on the same or different exchanges, boards of trade or other trading facilities or are held or written in one or more accounts or through one or more brokers. Thus, the number of options which the Trust may write or purchase may be affected by options written or purchased by other investment advisory clients of the Advisors. An exchange, board of trade or other trading facility may order the liquidation of positions found to be in excess of these limits, and it may impose certain other sanctions. Master Limited Partnerships. The Trust may invest up to 25% of the value of its total assets in MLPs. MLPs are limited partnerships or limited liability companies taxable as partnerships. MLPs may derive income and gains from the exploration, development, mining or production, processing, refining, transportation (including pipelines transporting gas, oil, or products thereof), or the marketing of any mineral or natural resources. The Trust may, however, invest in MLP entities in any sector of the economy. MLPs generally have two classes of owners, the general partner and limited partners. When investing in an MLP, the Trust generally purchases publicly traded common units issued to limited partners of the MLP. The general partner is typically owned by a major energy company, an investment fund, the direct management of the MLP or is an entity owned by one or more of such parties. The general partner may be structured as a private or publicly traded corporation or other entity. The general partner typically controls the operations and management of the MLP through an up to 2% equity interest in the MLP plus, in many cases, ownership of common units and subordinated units. Limited partners own the remainder of the partnership, through ownership of common units, and have a limited role in the partnership’s operations and management. The limited partners also receive cash distributions. Canadian Royalty Trusts. A Canadian royalty trust is a trust whose securities are listed on a Canadian stock exchange and which controls an underlying company whose business is the acquisition, exploitation, production and sale of oil and natural gas. These trusts generally pay out to unitholders the majority of the cash flow that they receive from the production and sale of underlying oil and natural gas reserves. The amount of distributions paid on a Canadian royalty trust’s units will vary from time to time based on production levels, commodity prices, royalty rates and certain expenses, deductions and costs, as well as on the distribution payout ratio policy adopted. As a result of distributing the bulk of their cash flow to unitholders, the ability of a Canadian royalty trust to finance internal growth through exploration is limited. Therefore, Canadian royalty trusts typically grow through acquisition of additional oil and gas properties or producing companies with proven reserves of oil and gas, funded through the issuance of additional equity or, where the trust is able, additional debt. Canadian royalty trusts, like other types of natural resources companies, are exposed to pricing risk, supply and demand risk and depletion and exploration risk with respect to their underlying commodities, among other risks. An investment in units of Canadian royalty trusts involves some risks which differ from an investment in common stock of a corporation, including increased liability for the obligations of the trust. There are certain regulatory and tax risks associated with an investment in Canadian royalty trusts resulting from reliance on beneficial Canadian incentive programs and tax laws that may be changed in the future. In addition, securities of certain Canadian royalty trusts may not be qualifying assets for the Trust’s asset diversification requirements. REITs. In pursuing its investment strategy, the Trust may invest in equity interests in REITs. REITs possess certain risks which differ from an investment in common stocks. REITs are financial vehicles that pool investors’ capital to purchase or finance real estate. REITs may concentrate their investments in specific geographic areas or in specific property types (e.g., hotels, shopping malls, residential complexes and office buildings). The market value of REIT shares and the ability of REITs to distribute income may be adversely affected by several factors, including rising interest rates, changes in the national, state and local economic climate and real estate conditions, perceptions of prospective tenants of the safety, convenience and attractiveness of the properties, the ability of the owners to provide adequate management, maintenance and insurance, the cost of complying with the Americans with Disabilities Act, increased competition from new properties, the impact of present or future environmental legislation and compliance with environmental laws, changes in real estate taxes and other operating expenses, adverse changes in governmental rules and fiscal policies, adverse changes in zoning laws and other factors beyond the control of the REIT issuers. In addition, distributions received by the Trust from REITs may consist of dividends, capital gains and/or return of capital. As REITs generally pay a higher rate of dividends (on a pre-tax basis) than operating companies, to the extent application of the Trust’s investment strategy results in the Trust investing in REIT shares, the percentage of the Trust’s dividend income received from REIT shares will likely exceed the percentage of the Trust’s portfolio which is comprised of REIT shares. There are three general categories of REITs: equity REITs, mortgage REITs and hybrid REITs. Equity REITs invest primarily in direct fee ownership or leasehold ownership of real property; they derive most of their income from rents. Mortgage REITs invest mostly in mortgages on real estate, which may secure construction, development or long-term loans, and the main source of their income is mortgage interest payments. Hybrid REITs hold both ownership and mortgage interests in real estate. Preferred Securities. The Trust may invest in preferred securities. There are two basic types of preferred securities. The first type, sometimes referred to as traditional preferred securities, consists of preferred stock issued by an entity taxable as a corporation. The second type, sometimes referred to as trust preferred securities, are usually issued by a trust or limited partnership and represent preferred interests in deeply subordinated debt instruments issued by the corporation for whose benefit the trust or partnership was established. Traditional Preferred Securities. Traditional preferred securities generally pay fixed or adjustable rate dividends to investors and generally have a “preference” over common stock in the payment of dividends and the liquidation of a company’s assets. This means that a company must pay dividends on preferred stock before paying any dividends on its common stock. In order to be payable, distributions on such preferred securities must be declared by the issuer’s board of directors. Income payments on typical preferred securities currently outstanding are cumulative, causing dividends and distributions to accumulate even if not declared by the board of directors or otherwise made payable. In such a case all accumulated dividends must be paid before any dividend on the common stock can be paid. However, some traditional preferred stocks are non-cumulative, in which case dividends do not accumulate and need not ever be paid. A portion of the portfolio may include investments in non-cumulative preferred securities, whereby the issuer does not have an obligation to make up any arrearages to its shareholders. Should an issuer of a non-cumulative preferred stock held by the Trust determine not to pay dividends on such stock, the amount of dividends the Trust pays may be adversely affected. There is no assurance that dividends or distributions on the traditional preferred securities in which the Trust invests will be declared or otherwise made payable. Preferred stockholders usually have no right to vote for corporate directors or on other matters. Shares of traditional preferred securities have a liquidation value that generally equals the original purchase price at the date of issuance. The market value of preferred securities may be affected by favorable and unfavorable changes impacting companies in the utilities and financial services sectors, which are prominent issuers of preferred securities, and by actual and anticipated changes in tax laws, such as changes in corporate income tax rates or the “Dividends Received Deduction.” Because the claim on an issuer’s earnings represented by traditional preferred securities may become onerous when interest rates fall below the rate payable on such securities, the issuer may redeem the securities. Thus, in declining interest rate environments in particular, the Trust’s holdings, if any, of higher rate-paying fixed rate preferred securities may be reduced and the Trust may be unable to acquire securities of comparable credit quality paying comparable rates with the redemption proceeds. Trust Preferred Securities. Trust preferred securities are typically issued by corporations, generally in the form of interest-bearing notes with preferred security characteristics, or by an affiliated business trust of a corporation, generally in the form of beneficial interests in subordinated debentures or similarly structured securities. The trust preferred securities market consists of both fixed and adjustable coupon rate securities that are either perpetual in nature or have stated maturity dates. Trust preferred securities are typically junior and fully subordinated liabilities of an issuer or the beneficiary of a guarantee that is junior and fully subordinated to the other liabilities of the guarantor. In addition, trust preferred securities typically permit an issuer to defer the payment of income for eighteen months or more without triggering an event of default. Generally, the deferral period is five years or more. Because of their subordinated position in the capital structure of an issuer, the ability to defer payments for extended periods of time without default consequences to the issuer, and certain other features (such as restrictions on common dividend payments by the issuer or ultimate guarantor when full cumulative payments on the trust preferred securities have not been made), these trust preferred securities are often treated as close substitutes for traditional preferred securities, both by issuers and investors. Trust preferred securities have many of the key characteristics of equity due to their subordinated position in an issuer’s capital structure and because their quality and value are heavily dependent on the profitability of the issuer rather than on any legal claims to specific assets or cash flows. Convertible Securities. A convertible security is a bond, debenture, note, preferred stock or other security that may be converted into or exchanged for a prescribed amount of common stock or other equity security of the same or a different issuer within a particular period of time at a specified price or formula. A convertible security entitles the holder to receive interest paid or accrued on debt or the dividend paid on preferred stock until the convertible security matures or is redeemed, converted or exchanged. Before conversion, convertible securities have characteristics similar to nonconvertible income securities in that they ordinarily provide a stable stream of income with generally higher yields than those of common stocks of the same or similar issuers, but lower yields than comparable nonconvertible securities. The value of a convertible security is influenced by changes in interest rates, with investment value declining as interest rates increase and increasing as interest rates decline. The credit standing of the issuer and other factors also may have an effect on the convertible security’s investment value. Convertible securities rank senior to common stock in a corporation’s capital structure but are usually subordinated to comparable nonconvertible securities. Convertible securities may be subject to redemption at the option of the issuer at a price established in the convertible security’s governing instrument. A “synthetic” or “manufactured” convertible security may be created by the Trust or by a third party by combining separate securities that possess the two principal characteristics of a traditional convertible security: an income producing component and a convertible component. The income-producing component is achieved by investing in non-convertible, income-producing securities such as bonds, preferred stocks and money market instruments. The convertible component is achieved by investing in securities or instruments such as warrants or options to buy common stock at a certain exercise price, or options on a stock index. Unlike a traditional convertible security, which is a single security having a single market value, a synthetic convertible comprises two or more separate securities, each with its own market value. Because the “market value” of a synthetic convertible security is the sum of the values of its income-producing component and its convertible component, the value of a synthetic convertible security may respond differently to market fluctuations than a traditional convertible security. The Trust also may purchase synthetic convertible securities created by other parties, including convertible structured notes. Convertible structured notes are income-producing debentures linked to equity. Convertible structured notes have the attributes of a convertible security; however, the issuer of the convertible note (typically an investment bank), rather than the issuer of the underlying common stock into which the note is convertible, assumes credit risk associated with the underlying investment and the Trust in turn assumes credit risk associated with the issuer of the convertible note. Warrants. Warrants are instruments issued by corporations enabling the owners to subscribe to and purchase a specified number of shares of the corporation at a specified price during a specified period of time. Warrants normally have a short life span to expiration. The purchase of warrants involves the risk that the Trust could lose the purchase value of a warrant if the right to subscribe to additional shares is not exercised prior to the warrants’ expiration. Also, the purchase of warrants involves the risk that the effective price paid for the warrant added to the subscription price of the related security may exceed the subscribed security’s market price such as when there is no movement in the level of the underlying security. Depositary Receipts. The Trust may invest in sponsored and unsponsored ADRs, EDRs, GDRs and other similar global instruments. ADRs typically are issued by a U.S. bank or trust company and evidence ownership of underlying securities issued by a non-U.S. corporation. EDRs, which are sometimes referred to as Continental Depositary Receipts, are receipts issued in Europe, typically by non-U.S. banks and trust companies, that evidence ownership of either non-U.S. or domestic underlying securities. GDRs are depositary receipts structured like global debt issues to facilitate trading on an international basis. U.S. Government Debt Securities. The Trust may invest in debt securities issued or guaranteed by the U.S. Government, its agencies or instrumentalities, including U.S. Treasury obligations, which differ in their interest rates, maturities and times of issuance. Such obligations include U.S. Treasury bills (maturity of one year or less), U.S. Treasury notes (maturity of one to ten years) and U.S. Treasury bonds (generally maturities of greater than ten years), including the principal components or the interest components issued by the U.S. Government under the separate trading of registered interest and principal securities program (i.e., “STRIPS”), all of which are backed by the full faith and credit of the United States. High Yield Securities. The Trust may invest in securities rated, at the time of investment, below investment grade quality, such as those rated Ba or lower by Moody’s Investor’s Service, Inc. (“Moody’s”), BB or below by S&P Global Ratings (“S&P”) or Fitch Ratings, Inc. (“Fitch”), or securities comparably rated by other rating agencies, or in unrated securities determined by the Advisors to be of comparable quality. Such securities, sometimes referred to as “high yield” or “junk” bonds, are predominantly speculative with respect to the capacity to pay interest and repay principal in accordance with the terms of the security and generally involve greater price volatility than securities in higher rating categories. Often the protection of interest and principal payments with respect to such securities may be very moderate and issuers of such securities face major ongoing uncertainties or exposure to adverse business, financial or economic conditions which could lead to inadequate capacity to meet timely interest and principal payments. Lower grade securities, though high yielding, are characterized by high risk. They may be subject to certain risks with respect to the issuing entity and to greater market fluctuations than certain lower yielding, higher rated securities. The secondary market for lower grade securities may be less liquid than that of higher rated securities. Adverse conditions could make it difficult at times for the Trust to sell certain high yield securities or could result in lower prices than those used in calculating the Trust’s NAV. The prices of fixed-income securities generally are inversely related to interest rate changes; however, the price volatility caused by fluctuating interest rates of securities also is inversely related to the coupons of such securities. Accordingly, below investment grade securities may be relatively less sensitive to interest rate changes than higher quality securities of comparable maturity because of their higher coupon. The investor receives this higher coupon in return for bearing greater credit risk. The higher credit risk associated with below investment grade securities potentially can have a greater effect on the market value of such securities than may be the case with higher quality issues of comparable maturity. Lower grade securities may be particularly susceptible to economic downturns. It is likely that an economic recession could severely disrupt the market for such securities and may have an adverse impact on the value of such securities. In addition, it is likely that any such economic downturn could adversely affect the ability of the issuers of such securities to repay principal and pay interest thereon and increase the incidence of default for such securities. The ratings of Moody’s, S&P, Fitch and other rating agencies represent their opinions as to the quality of the obligations which they undertake to rate. Ratings are relative and subjective and, although ratings may be useful in evaluating the safety of interest and principal payments, they do not evaluate the market value risk of such obligations. Although these ratings may be an initial criterion for selection of portfolio investments, the Advisors also will independently evaluate these securities and the ability of the issuers of such securities to pay interest and principal. To the extent that the Trust invests in lower grade securities that have not been rated by a rating agency, the Trust’s ability to achieve its investment objective will be more dependent on the Advisors’ credit analysis than would be the case when the Trust invests in rated securities. Foreign Currency Transactions. The Trust’s common shares are priced in U.S. dollars and the distributions paid by the Trust to common shareholders are paid in U.S. dollars. However, a portion of the Trust’s assets may be denominated in non-U.S. currencies and the income received by the Trust from such securities will be paid in non-U.S. currencies. The Trust also may invest in or gain exposure to non-U.S. currencies for investment or hedging purposes. The Trust’s investments in securities that trade in, or receive revenues in, non-U.S. currencies will be subject to currency risk, which is the risk that fluctuations in the exchange rates between the U.S. dollar and foreign currencies may negatively affect an investment. The Trust may (but is not required to) hedge some or all of its exposure to non-U.S. currencies through the use of derivative strategies, including forward foreign currency exchange contracts, foreign currency futures contracts and options on foreign currencies and foreign currency futures. Suitable hedging transactions may not be available in all circumstances and there can be no assurance that the Trust will engage in such transactions at any given time or from time to time when they would be beneficial. Although the Trust has the flexibility to engage in such transactions, the Advisors may determine not to do so or to do so only in unusual circumstances or market conditions. These transactions may not be successful and may eliminate any chance for the Trust to benefit from favorable fluctuations in relevant foreign currencies. The Trust may also use derivatives contracts for purposes of increasing exposure to a foreign currency or to shift exposure to foreign currency fluctuations from one currency to another. Strategic Transactions and Other Management Techniques. In addition to the options strategy discussed above, the Trust may use a variety of other investment management techniques and instruments. The Trust may purchase and sell futures contracts, enter into various interest rate transactions such as swaps, caps, floors or collars, currency transactions such as currency forward contracts, currency futures contracts, currency swaps or options on currency or currency futures and swap contracts (including, but not limited to, credit default swaps) and may purchase and sell exchange-listed and OTC put and call options on securities and swap contracts, financial indices and futures contracts and use other derivative instruments or management techniques (collectively, “Strategic Transactions”). These Strategic Transactions may be used for duration management and other risk management purposes, including to attempt to protect against possible changes in the market value of the Trust’s portfolio resulting from trends in the securities markets and changes in interest rates or to protect the Trust’s unrealized gains in the value of its portfolio securities, to facilitate the sale of portfolio securities for investment purposes, to establish a position in the securities markets as a temporary substitute for purchasing particular securities or to enhance income or gain. There is no particular strategy that requires use of one technique rather than another as the decision to use any particular strategy or instrument is a function of market conditions and the composition of the portfolio. The use of Strategic Transactions to enhance current income may be particularly speculative. The ability of the Trust to use Strategic Transactions successfully will depend on the Advisors’ ability to predict pertinent market movements as well as sufficient correlation among the instruments, which cannot be assured. The use of Strategic Transactions may result in losses greater than if they had not been used, may require the Trust to sell or purchase portfolio securities at inopportune times or for prices other than current market values, may limit the amount of appreciation the Trust can realize on an investment or may cause the Trust to hold a security that it might otherwise sell. The SAI contains further information about the characteristics, risks and possible benefits of Strategic Transactions and the Trust’s other policies and limitations (which are not fundamental policies) relating to Strategic Transactions. Certain provisions of the Code may restrict or affect the ability of the Trust to engage in Strategic Transactions. In addition, the use of certain Strategic Transactions may give rise to taxable income and have certain other consequences. Other Investment Companies. The Trust may invest up to 10% of its total assets in securities of other open- or closed-end investment companies that invest primarily in Utilities, Infrastructure or Power Opportunities securities of the types in which the Trust may invest directly. The Trust generally expects to invest in other investment companies either during periods when it has large amounts of uninvested cash, such as the period shortly after the Trust receives the proceeds of the offering of its common shares, or during periods when there is a shortage of attractive Utilities, Infrastructure and Power Opportunities securities available in the market. As a shareholder in an investment company, the Trust will bear its ratable share of that investment company’s expenses, and will remain subject to payment of the Trust’s advisory and other fees and expenses with respect to assets so invested. Holders of common shares will therefore be subject to duplicative expenses to the extent the Trust invests in other investment companies. The Advisors will take expenses into account when evaluating the investment merits of an investment in an investment company relative to available Utilities, Infrastructure and Power Opportunities securities investments. In addition, the securities of other investment companies may be leveraged and will therefore be subject to leverage risks. The net asset value and market value of leveraged shares will be more volatile and the yield to shareholders will tend to fluctuate more than the yield generated by unleveraged shares. Investment companies may have investment policies that differ from those of the Trust. In addition, to the extent the Trust invests in other investment companies, the Trust will be dependent upon the investment and research abilities of persons other than the Advisors. The Trust treats its investments in such open- or closed-end investment companies as investments in Utilities and Infrastructure securities. The Trust may invest in ETFs, which are investment companies that typically aim to track or replicate a desired index, such as a sector, market or global segment. ETFs are typically passively managed and their shares are traded on a national exchange or The NASDAQ Stock Market, Inc. ETFs do not sell individual shares directly to investors and only issue their shares in large blocks known as “creation units.” The investor purchasing a creation unit may sell the individual shares on a secondary market. Therefore, the liquidity of ETFs depends on the adequacy of the secondary market. There can be no assurance that an ETF’s investment objective will be achieved, as ETFs based on an index may not replicate and maintain exactly the composition and relative weightings of securities in the index. ETFs are subject to the risks of investing in the underlying securities. The Trust, as a holder of the securities of the ETF, will bear its pro rata portion of the ETF’s expenses, including advisory fees (except that it will not be subject to duplicate advisory fees with respect to ETFs managed by the Advisor or its affiliates). These expenses are in addition to the direct expenses of the Trust’s own operations. Securities Lending. The Trust may lend portfolio securities to certain borrowers determined to be creditworthy by the Advisor, including to borrowers affiliated with the Advisor. The borrowers provide collateral that is maintained in an amount at least equal to the current market value of the securities loaned. No securities loan will be made on behalf of the Trust if, as a result, the aggregate value of all securities loans of the Trust exceeds one-third of the value of the Trust’s total assets (including the value of the collateral received). The Trust may terminate a loan at any time and obtain the return of the securities loaned. The Trust receives the value of any interest or cash or non-cash distributions paid on the loaned securities. With respect to loans that are collateralized by cash, the borrower may be entitled to receive a fee based on the amount of cash collateral. The Trust is compensated by the difference between the amount earned on the reinvestment of cash collateral and the fee paid to the borrower. In the case of collateral other than cash, the Trust is compensated by a fee paid by the borrower equal to a percentage of the market value of the loaned securities. Any cash collateral received by the Trust for such loans, and uninvested cash, may be invested, among other things, in a private investment company managed by an affiliate of the Advisor or in registered money market funds advised by the Advisor or its affiliates; such investments are subject to investment risk. The Trust conducts its securities lending pursuant to an exemptive order from the SEC permitting it to lend portfolio securities to borrowers affiliated with the Trust and to retain an affiliate of the Trust as lending agent. To the extent that the Trust engages in securities lending, BlackRock Investment Management, LLC (“BIM”), an affiliate of the Advisor, acts as securities lending agent for the Trust, subject to the overall supervision of the Advisor. BIM administers the lending program in accordance with guidelines approved by the Board. The Trust retains a portion of securities lending income and remits a remaining portion to BIM as compensation for its services as securities lending agent. Securities lending income is equal to the total of income earned from the reinvestment of cash collateral (and excludes collateral investment expenses as defined below), and any fees or other payments to and from borrowers of securities. As securities lending agent, BIM bears all operational costs directly related to securities lending. The Trust is responsible for expenses in connection with the investment of cash collateral received for securities on loan (the “collateral investment expenses”). The cash collateral is invested in a private investment company managed by the Advisor or its affiliates. However, BIM has agreed to cap the collateral investment expenses of the private investment company to an annual rate of 0.04%. In addition, in accordance with the exemptive order, the investment adviser to the private investment company will not charge any advisory fees with respect to shares purchased by the Trust. Such shares also will not be subject to a sales load, distribution fee or service fee. If the private investment company’s weekly liquid assets fall below 30% of its total assets, BIM, as managing member of the private investment company, is permitted at any time, if it determines it to be in the best interests of the private investment company, to impose a liquidity fee of up to 2% of the value of units withdrawn or impose a redemption gate that temporarily suspends the right of withdrawal out of the private investment company. In addition, if the private investment company’s weekly liquid assets fall below 10% of its total assets at the end of any business day, the private investment company will impose a liquidity fee in the default amount of 1% of the amount withdrawn, generally effective as of the next business day, unless BIM determines that a higher (not to exceed 2%) or lower fee level or not imposing a liquidity fee is in the best interests of the private investment company. The shares of the private investment company purchased by the Trust would be subject to any such liquidity fee or redemption gate imposed. Under the securities lending program, the Trust is categorized into a specific asset class. The determination of the Trust’s asset class category (fixed income, domestic equity, international equity, or fund of funds), each of which may be subject to a different fee arrangement, is based on a methodology agreed to between the Trust and BIM. Pursuant to the current securities lending agreement: (i) the Trust retains 82% of securities lending income (which excludes collateral investment expenses), and (ii) this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. In addition, commencing the business day following the date that the aggregate securities lending income earned across the BlackRock Fixed-Income Complex in a calendar year exceeds a specified threshold, the Trust, pursuant to the current securities lending agreement, will receive for the remainder of that calendar year securities lending income as follows: (i) 85% of securities lending income (which excludes collateral investment expenses); and (ii) this amount can never be less than 70% of the sum of securities lending income plus collateral investment expenses. Short Sales. The Trust may make short sales of securities. A short sale is a transaction in which the Trust sells a security it does not own in anticipation that the market price of that security will decline. The Trust may make short sales to hedge positions, for duration and risk management, in order to maintain portfolio flexibility or to enhance income or gain. When the Trust makes a short sale, it must borrow the security sold short and deliver it to the broker-dealer through which it made the short sale as collateral for its obligation to deliver the security upon conclusion of the sale. The Trust may have to pay a fee to borrow particular securities and is often obligated to pay over to the securities lender any income, distributions or dividends received on such borrowed securities until it returns the security to the securities lender. The Trust’s obligation to replace the borrowed security will be secured by collateral deposited with the securities lender, usually cash, U.S. Government securities or other liquid assets. Depending on arrangements made with the securities lender regarding payment over of any income, distributions or dividends received by the Trust on such security, the Trust may not receive any payments (including interest) on its collateral deposited with such securities lender. If the price of the security sold short increases between the time of the short sale and the time the Trust replaces the borrowed security, the Trust will incur a loss; conversely, if the price declines, the Trust will realize a gain. Any gain will be decreased, and any loss increased, by the transaction costs described above. Although the Trust’s gain is limited to the price at which it sold the security short, its potential loss is theoretically unlimited. The Trust will not make a short sale if, after giving effect to such sale, the market value of all securities sold short exceeds 15% of the value of its total assets or the Trust’s aggregate short sales of a particular class of securities of an issuer exceeds 15% of the issuer’s outstanding securities of that class. The Trust may also make short sales “against the box” without respect to such limitations. In this type of short sale, at the time of the sale, the Trust owns or has the immediate and unconditional right to acquire at no additional cost the identical security. Short sales may represent a form of leverage and will create risks. The Trust must comply with Rule 18f-4 under the Investment Company Act with respect to its short sale borrowings, which are considered derivatives transactions under the Rule. See “Additional Risk Factors—Risk Factors in Strategic Transactions and Derivatives—Rule 18f-4 Under the Investment Company Act” in the SAI. |  |  |  |  |  |  |  |  |  |
Risk Factors [Table Text Block] |  | RISKS The NAV and market price of, and dividends paid on, the common shares will fluctuate with and be affected by, among other things, the risks more fully described below. General Risks Please refer to the section of the Trust’s most recent annual report on Form N-CSR entitled “Investment Objectives, Policies and Risks—Risk Factors”, which is incorporated by reference herein, for a discussion of the general risks of investing in the Trust. Other Risks Focus Risk The Trust invests significantly in issuers in the Utilities, Infrastructure and Power Opportunities business segments. Because the Trust invests significantly in those business segments, it may be subject to more risks than if it were broadly diversified over numerous industries and sectors of the economy. General changes in market sentiment towards Utilities, Infrastructure and Power Opportunities companies may adversely affect the Trust, and the performance of Utilities, Infrastructure and Power Opportunities issuers may lag behind the broader market as a whole. Also, the Trust’s focus on the Utilities, Infrastructure and Power Opportunities business segments may subject the Trust to a variety risks associated with those business segments. Additional Risks of Investing in Utilities, Infrastructure and Power Opportunities Issuers Investments in issuers in the Utilities, Infrastructure and Power Opportunities business segments are subject to certain risks, including the following: Technological Risk. Technological changes in the way a service or product is delivered may render existing technologies obsolete. Although this risk may be considered low with respect to assets of Utilities, Infrastructure and Power Opportunities companies given the large fixed costs involved in developing such assets and the fact that many utilities, infrastructure and power opportunities technologies are well established, any technological change that occurs over the medium term could threaten the profitability of a Utilities, Infrastructure and Power Opportunities company. Utilities, Infrastructure and Power Opportunities assets have very few alternative uses should they become obsolete. Communications utilities may be particularly sensitive to these risks, as telecommunications products and services also may be subject to rapid obsolescence resulting from changes in consumer tastes, intense competition and strong market reactions to technological development. Developing Industries Risk. Some Utilities, Infrastructure and Power Opportunities companies are focused on developing new technologies and are strongly influenced by technological changes. Product development efforts by Utilities, Infrastructure and Power Opportunities companies may not result in viable commercial products. Utilities, Infrastructure and Power Opportunities companies may bear high research and development costs, which can limit their ability to maintain operations during periods of organizational growth or instability. Some Utilities, Infrastructure and Power Opportunities issuers may be in the early stages of operations and may have limited operating histories and smaller market capitalizations on average than companies in other sectors. As a result of these and other factors, the value of investments in such Utilities, Infrastructure and Power Opportunities issuers may be considerably more volatile than that in more established segments of the economy. Regional Risk. Should an event that impairs assets or facilities occur in a region where a Utilities, Infrastructure and Power Opportunities issuer operates, the performance of such Utilities, Infrastructure and Power Opportunities company may be adversely affected. As many infrastructure assets are not moveable, such an event may have enduring effects on the Utilities, Infrastructure and Power Opportunities company that are difficult to mitigate. Strategic Asset Risk. Utilities, Infrastructure and Power Opportunities companies may control significant strategic assets. Strategic assets are assets that have a national or regional profile, and may have monopolistic characteristics. Given the national or regional profile and/or their irreplaceable nature, strategic assets may constitute a higher risk target for terrorist acts or adverse political actions. Environmental Risk. Utilities, Infrastructure and Power Opportunities companies can have substantial environmental impacts. Ordinary operations or operational accidents may cause major environmental damage, which could cause Utilities, Infrastructure and Power Opportunities companies significant financial distress. For example, an accidental release from wells or gathering pipelines could subject them to substantial liabilities for environmental cleanup and restoration costs, claims made by neighboring landowners and other third parties for personal injury and property damage, and fines or penalties for related violations of environmental laws or regulations. Utilities, Infrastructure and Power Opportunities companies may not be able to recover these costs from insurance. Environmental regulations to which Utilities, Infrastructure and Power Opportunities companies may be subject include, for example: (i) the federal Clean Air Act and comparable state laws and regulations that impose obligations related to air emissions, (ii) the federal Clean Water Act and comparable state laws and regulations that impose obligations related to discharges of pollutants into regulated bodies of water, (iii) the federal Resource Conservation and Recovery Act (“RCRA”) and comparable state laws and regulations that impose requirements for the handling and disposal of waste from facilities; and (iv) the federal Comprehensive Environmental Response, Compensation and Liability Act of 1980 (“CERCLA”), also known as “Superfund,” and comparable state laws and regulations that regulate the cleanup of hazardous substances. Failure to comply with these laws and regulations may trigger a variety of administrative, civil and criminal enforcement measures, including the assessment of monetary penalties, the imposition of remedial requirements, and the issuance of orders enjoining future operations. Certain environmental statutes, including RCRA, CERCLA, the federal Oil Pollution Act and analogous state laws and regulations, impose strict, joint and several liability for costs required to clean up and restore sites where hazardous substances have been disposed of or otherwise released. Voluntary initiatives and mandatory controls have been adopted or are being discussed both in the United States and worldwide to reduce emissions of “greenhouse gases” such as carbon dioxide, a by-product of burning fossil fuels, and methane, the major constituent of natural gas, which many scientists and policymakers believe contribute to global climate change. These measures and future measures could result in increased costs to certain companies in which the Trust may invest to operate and maintain facilities and administer and manage a greenhouse gas emissions program and may reduce demand for fuels that generate greenhouse gases and that are managed or produced by companies in which the Trust may invest. Following a series of Supreme Court decisions, the Environmental Protection Agency (“EPA”) continues to regulate greenhouse gas emissions under the Clean Air Act, although the scope of that authority is subject to ongoing litigation and may change. The EPA and the National Highway Traffic Safety Administration have issued successive rounds of greenhouse gas and fuel economy standards which may increase compliance costs for transportation fuel suppliers and could dampen long-term demand for fossil fuels, which may adversely affect certain of the Trust’s investments. Community and environmental groups may protest the development or operation of assets or facilities of Utilities, Infrastructure and Power Opportunities companies, and these protests may induce government action to the detriment of Utilities, Infrastructure and Power Opportunities companies. Political and Expropriation Risk. Governments may attempt to influence the operations, revenue, profitability or contractual relationships of Utilities, Infrastructure and Power Opportunities issuers or expropriate their assets. The public interest aspect of the products and services provided by Utilities, Infrastructure and Power Opportunities companies means political oversight will remain pervasive. Operational Risk. The long-term profitability of Utilities, Infrastructure and Power Opportunities companies is partly dependent on the efficient operation and maintenance of their assets and facilities. Utilities, Infrastructure and Power Opportunities issuers may be subject to service interruptions due to environmental disasters, operational accidents or terrorist activities, which may impair their ability to maintain payments of dividends or interest to investors. The destruction or loss of an asset or facility may have a major adverse impact on a Utilities, Infrastructure and Power Opportunities issuer. Failure by the Utilities, Infrastructure and Power Opportunities issuer to operate and maintain their assets and facilities appropriately or to carry appropriate, enforceable insurance could lead to significant losses. Regulatory Risk. Many Utilities, Infrastructure and Power Opportunities companies are subject to significant federal, state and local government regulation, which may include how facilities are constructed, maintained and operated, environmental and safety controls and the prices they may charge for the products and services they provide. Various governmental authorities have the power to enforce compliance with these regulations and the permits issued under them, and violators are subject to administrative, civil and criminal penalties, including civil fines, injunctions or both. There are substantial differences among the regulatory practices and policies of various jurisdictions, and any given regulatory agency may make major shifts in policy from time to time. Stricter laws, regulations or enforcement policies could be enacted in the future which would likely increase compliance costs and may adversely affect the operations and financial performance of Utilities, Infrastructure and Power Opportunities issuers. Regulators that have the power to set or modify the prices Utilities, Infrastructure and Power Opportunities issuers can charge for their products or services can have a significant impact on the profitability of such Utilities, Infrastructure and Power Opportunities issuers. The returns on regulated assets or services are usually stable during regulated periods, but may be volatile during any period that rates are reset by the regulator. Utilities, Infrastructure and Power Opportunities companies may be adversely affected by additional regulatory requirements enacted in response to environmental disasters, which may impose additional costs or limit certain operations by such companies operating in various sectors. Foreign Utilities, Infrastructure and Power Opportunities companies are also subject to regulation, although such regulations may or may not be comparable to those in the United States. Foreign Utilities, Infrastructure and Power Opportunities companies may be more heavily regulated by their respective governments than utilities in the United States and, as in the United States, generally are required to seek government approval for rate increases. In addition, many foreign Utilities, Infrastructure and Power Opportunities companies use fuels that may cause more pollution than those used in the United States, which may require such utilities to invest in pollution control equipment to meet any proposed pollution restrictions. Foreign regulatory systems vary from country to country and may evolve in ways different from regulation in the United States. Interest Rate Risk. Due to the high costs of developing, constructing, operating and distributing infrastructure assets, many Utilities, Infrastructure and Power Opportunities companies are highly leveraged. As such, movements in the level of interest rates may affect the returns from these assets. The structure and nature of the debt is therefore an important element to consider in assessing the interest rate risk posed by Utilities, Infrastructure and Power Opportunities issuers. In particular, the type of facilities, maturity profile, rates being paid, fixed versus variable components and covenants in place (including how they impact returns to equity holders) are crucial factors in assessing any the degree of interest rate risk. Inflation Risk. Many Utilities, Infrastructure and Power Opportunities companies may have fixed income streams and, therefore, be unable to increase their dividends during inflationary periods. The market value of Utilities, Infrastructure and Power Opportunities companies may decline in value in times of higher inflation rates. The prices that a Utilities, Infrastructure and Power Opportunities company is able to charge users of its assets may not always be linked to inflation. In this case, changes in the rate of inflation may affect the forecast profitability of the Utilities, Infrastructure and Power Opportunities. Supply and Demand Risk. Utilities, Infrastructure and Power Opportunities companies may be subject to supply and demand fluctuations in the markets they serve which will be impacted by a wide range of factors. A decrease in the production of natural gas, natural gas liquids, crude oil, coal or other energy commodities, a decrease in the volume of such commodities available for transportation, mining, processing, storage or distribution, or a sustained decline in demand for such commodities, may adversely impact the financial performance of Utilities, Infrastructure and Power Opportunities companies. Factors affecting the volume of production of energy commodities and the volume of energy commodities available for transportation, storage, processing or distribution include depletion of resources; depressed commodity prices; catastrophic events; labor relations; increased environmental or other governmental regulation; equipment malfunctions and maintenance difficulties; import volumes; international politics; policies of the Organization of Petroleum Exporting Countries; and increased competition from alternative energy sources. Alternatively, a decline in demand for energy commodities could result from factors such as adverse economic conditions (especially in key energy-consuming countries); increased taxation; weather conditions; increased environmental or other governmental regulation; increased fuel economy; increased energy conservation or use of alternative energy sources; legislation intended to promote the use of alternative energy sources; or increased commodity prices. Customer Risk. The revenue of many Utilities, Infrastructure and Power Opportunities companies may be impacted by the number of users who use the products or services produced by the Utilities, Infrastructure and Power Opportunities company. A significant decrease in the number of users may negatively impact the profitability of a Utilities, Infrastructure and Power Opportunities company. Infrastructure companies can have a narrow customer base. Should these customers or counterparties fail to pay their contractual obligations, significant revenues could cease and not be replaceable. This would affect the profitability of the infrastructure company and the value of any securities or other instruments it has issued. Project and Financing Risk. To the extent the Trust invests in Utilities, Infrastructure and Power Opportunities companies which are dependent to a significant extent on new infrastructure projects, the Trust may be exposed to the risk that the project will not be completed within budget, within the agreed time frame or to agreed specifications. From time to time, infrastructure companies may encounter difficulties in obtaining financing for construction programs during inflationary periods. Issuers experiencing difficulties in financing construction programs may also experience lower profitability, which can result in reduced income to the Trust. Weather and Natural Disasters Risk. Weather plays a role in the seasonality of some Utilities, Infrastructure and Power Opportunities companies’ cash flows. Although most Utilities, Infrastructure and Power Opportunities companies that are subject to weather risk can reasonably predict seasonal weather demand based on normal weather patterns, extreme weather conditions demonstrate that no amount of preparation can protect an Utilities, Infrastructure and Power Opportunities company from the unpredictability of the weather. Natural disaster risks, such as earthquakes, flood, lightning, hurricanes and wind, are risks facing certain Utilities, Infrastructure and Power Opportunities companies. The damage done by extreme weather or natural disasters also may serve to increase many Utilities, Infrastructure and Power Opportunities companies insurance premiums. Corporate Bonds Risk The market value of a corporate bond generally may be expected to rise and fall inversely with interest rates. The market value of intermediate and longer term corporate bonds is generally more sensitive to changes in interest rates than is the market value of shorter term corporate bonds. The market value of a corporate bond also may be affected by factors directly related to the issuer, such as investors’ perceptions of the creditworthiness of the issuer, the issuer’s financial performance, perceptions of the issuer in the market place, performance of management of the issuer, the issuer’s capital structure and use of financial leverage and demand for the issuer’s goods and services. Certain risks associated with investments in corporate bonds are described elsewhere in this Prospectus in further detail, including under “Risks—Inflation Risk” and “Risks—Deflation Risk.” There is a risk that the issuers of corporate bonds may not be able to meet their obligations on interest or principal payments at the time called for by an instrument. Corporate bonds of below investment grade quality are often high risk and have speculative characteristics and may be particularly susceptible to adverse issuer-specific developments. Unrated Securities Risk The Trust may purchase securities that are not rated by any rating organization. The Advisors may, after assessing such securities’ credit quality, internally assign ratings to certain of those securities in categories similar to those of rating organizations. Some unrated securities may not have an active trading market or may be difficult to value, which means the Trust might have difficulty selling them promptly at an acceptable price. To the extent that the Trust invests in unrated securities, the Trust’s ability to achieve its investment objective will be more dependent on the Advisors’ credit analysis than would be the case when the Trust invests in rated securities. Dividend Risk Historically, Utilities, Infrastructure and Power Opportunities companies have generally paid dividends on their equity securities. However, dividends on common stocks are not fixed but are declared at the discretion of an issuer’s board of directors. There is no guarantee that the issuers of the common stocks in which the Trust invests will declare dividends in the future or that if declared they will remain at current levels or increase over time. As described further in “Tax Matters,” “qualified dividend income” received by the Trust and passed through to shareholders will generally be eligible for the reduced tax rates applicable to long-term capital gains realized by individuals. There is no assurance as to what portion of the Trust’s distributions will constitute qualified dividend income. Inflation Risk Inflation risk is the risk that the value of assets or income from investment will be worth less in the future, as inflation decreases the value of money. Inflation rates may change frequently and drastically as a result of various factors, including unexpected shifts in the domestic or global economy. As inflation increases, the real value of the common shares and distributions on those shares can decline. In addition, during any periods of rising inflation, interest rates on any borrowings by the Trust would likely increase, which would tend to further reduce returns to the holders of common shares. Deflation Risk Deflation risk is the risk that prices throughout the economy decline over time, which may have an adverse effect on the market valuation of companies, their assets and their revenues. In addition, deflation may have an adverse effect on the creditworthiness of issuers and may make issuer default more likely, which may result in a decline in the value of the Trust’s portfolio. Swaps Risk Swaps are a type of derivative. Swap agreements involve the risk that the party with which the Trust has entered into the swap will default on its obligation to pay the Trust and the risk that the Trust will not be able to meet its obligations to pay the other party to the agreement. To seek to hedge the value of the Trust’s portfolio, to hedge against increases in the Trust’s cost associated with interest payments on any outstanding borrowings or to increase the Trust’s return, the Trust may enter into swaps, including interest rate swap, total return swap (sometimes referred to as a “contract for difference”) and/or credit default swap transactions. In interest rate swap transactions, there is a risk that yields will move in the direction opposite of the direction anticipated by the Trust, which would cause the Trust to make payments to its counterparty in the transaction that could adversely affect Trust performance. In addition to the risks applicable to swaps generally (including counterparty risk, high volatility, liquidity risk and credit risk), credit default swap transactions involve special risks because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). Historically, swap transactions have been individually negotiated non-standardized transactions entered into in OTC markets and have not been subject to the same type of government regulation as exchange-traded instruments. However, since the global financial crisis, the OTC derivatives markets have become subject to comprehensive statutes and regulations. In particular, in the United States, the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 (the “Dodd-Frank Act”) requires that certain derivatives with U.S. persons must be executed on a regulated market and a substantial portion of OTC derivatives must be submitted for clearing to regulated clearinghouses. As a result, swap transactions entered into by the Trust may become subject to various requirements applicable to swaps under the Dodd-Frank Act, including clearing, exchange-execution, reporting and recordkeeping requirements, which may make it more difficult and costly for the Trust to enter into swap transactions and may also render certain strategies in which the Trust might otherwise engage impossible or so costly that they will no longer be economical to implement. Furthermore, the number of counterparties that may be willing to enter into swap transactions with the Trust may also be limited if the swap transactions with the Trust are subject to the swap regulation under the Dodd-Frank Act. Credit default and total return swap agreements may effectively add leverage to the Trust’s portfolio because, in addition to its Managed Assets, the Trust would be subject to investment exposure on the notional amount of the swap. Total return swap agreements are subject to the risk that a counterparty will default on its payment obligations to the Trust thereunder. The Trust is not required to enter into swap transactions for hedging purposes or to enhance income or gain and may choose not to do so. In addition, the swaps market is subject to a changing regulatory environment. It is possible that regulatory or other developments in the swaps market could adversely affect the Trust’s ability to successfully use swaps. Defensive Investing Risk For defensive purposes, the Trust may allocate assets into cash or short-term fixed-income securities without limitation. In doing so, the Trust may succeed in avoiding losses but may otherwise fail to achieve its investment objective. Further, the value of short-term fixed-income securities may be affected by changing interest rates and by changes in credit ratings of the investments. If the Trust holds cash uninvested it will be subject to the credit risk of the depository institution holding the cash. Risks Associated with Recent Market Events Although interest rates were unusually low in recent years in the U.S. and abroad, in 2022, the Federal Reserve and certain foreign central banks raised interest rates as part of their efforts to address rising inflation. The Federal Reserve and certain foreign central banks have started to lower interest rates, though economic or other factors, such as inflation, could stop such changes. It is difficult to accurately predict the pace at which interest rates might change, the timing, frequency or magnitude of any such changes in interest rates, or when such changes might stop or again reverse course. Additionally, various economic and political factors could cause the Federal Reserve or other foreign central banks to change their approach in the future and such actions may result in an economic slowdown both in the U.S. and abroad. Unexpected changes in interest rates could lead to significant market volatility or reduce liquidity in certain sectors of the market. Deteriorating economic fundamentals may, in turn, increase the risk of default or insolvency of particular issuers, negatively impact market value, cause credit spreads to widen, and reduce bank balance sheets. Any of these could cause an increase in market volatility, reduce liquidity across various markets or decrease confidence in the markets, which could negatively affect the value of debt instruments held by the Trust and result in a negative impact on the Trust’s performance. See “—Inflation Risk.” Political and diplomatic events within the United States, including a contentious domestic political environment, changes in political party control of one or more branches of the U.S. Government, the U.S. Government’s inability at times to agree on a long-term budget and deficit reduction plan, the threat of a U.S. Government shutdown, and disagreements over, or threats not to increase, the U.S. Government’s borrowing limit (or “debt ceiling”), as well as political and diplomatic events abroad, may affect investor and consumer confidence and may adversely impact financial markets and the broader economy, perhaps suddenly and to a significant degree. A downgrade of the ratings of U.S. Government debt obligations, or concerns about the U.S. Government’s credit quality in general, could have a substantial negative effect on the U.S. and global economies. For example, concerns about the U.S. Government’s credit quality may cause increased volatility in the stock and bond markets, higher interest rates, reduced prices and liquidity of U.S. Treasury securities, and/or increased costs of various kinds of debt. Moreover, although the U.S. Government has honored its credit obligations, there remains a possibility that the United States could default on its obligations. The consequences of such an unprecedented event are impossible to predict, but it is likely that a default by the United States would be highly disruptive to the U.S. and global securities markets and could significantly impair the value of the Trust’s investments. In recent years, some countries, including the United States, have adopted more protectionist trade policies. Slowing global economic growth, the rise in protectionist trade policies, inflationary pressures, changes to some major international trade agreements, risks associated with the trade agreements between countries and regions, including the U.S. and other foreign nations, political or economic dysfunction within some countries or regions, including the U.S., and dramatic changes in commodity and currency prices could affect the economies of many nations in ways that cannot necessarily be foreseen at the present time. In addition, if the U.S. dollar continues to be strong, it may decrease foreign demand for U.S. assets, which could have a negative impact on certain issuers and/or industries. EMU and Redenomination Risk Any partial or complete dissolution of the Economic and Monetary Union (the “EMU”) could have significant adverse effects on currency and financial markets, and on the values of the Trust’s portfolio investments. If one or more EMU countries were to stop using the Euro as its primary currency, the Trust’s investments in such countries may be redenominated into a different or newly adopted currency. As a result, the value of those investments could decline significantly and unpredictably. In addition, securities or other investments that are redenominated may be subject to foreign currency risk, liquidity risk and valuation risk to a greater extent than similar investments currently denominated in Euros. To the extent a currency used for redenomination purposes is not specified in respect of certain EMU-related investments, or should the Euro cease to be used entirely, the currency in which such investments are denominated may be unclear, making such investments particularly difficult to value or dispose of. The Trust may incur additional expenses to the extent it is required to seek judicial or other clarification of the denomination or value of such securities. Market Disruption and Geopolitical Risk The occurrence of events similar to those in recent years, such as the aftermath of the war in Iraq, instability in Afghanistan, Pakistan, Egypt, Libya, Syria and the Middle East, international war or conflict (including the Israel-Hamas war), new and ongoing epidemics and pandemics of infectious diseases and other global health events, natural/environmental disasters, terrorist attacks in the United States and around the world, social and political discord, debt crises (such as the Greek crisis), sovereign debt downgrades, the Russian invasion of Ukraine, increasingly strained relations between the United States and a number of foreign countries, including historical adversaries, such as North Korea, Iran, China and Russia, and the international community generally, new and continued political unrest in various countries, such as Venezuela and Spain, the exit or potential exit of one or more countries from the EU or the EMU, and continued changes in the balance of political power among and within the branches of the U.S. Government, among others, may result in market volatility, may have long term effects on the U.S. and worldwide financial markets, and may cause further economic uncertainties in the United States and worldwide. Russia launched a large-scale invasion of Ukraine on February 24, 2022. The extent and duration of the military action, resulting sanctions and resulting future market disruptions, including declines in its stock markets and the value of the ruble against the U.S. dollar, in the region are impossible to predict, but could be significant. Any such disruptions caused by Russian military action or other actions (including cyberattacks and espionage) or resulting actual and threatened responses to such activity, including purchasing and financing restrictions, boycotts or changes in consumer or purchaser preferences, sanctions, tariffs or cyberattacks on the Russian government, Russian companies or Russian individuals, including politicians, could have a severe adverse effect on Russia and the European region, including significant negative impacts on the Russian economy, the European economy and the markets for certain securities and commodities, such as oil and natural gas, and may likely have collateral impacts on such sectors globally as well as other sectors. How long such military action and related events will last cannot be predicted. Trade tensions between the United States and China have led to concerns about economic stability and could have an adverse impact on global economic conditions. The United States and China have each been implementing increased tariffs on imports from the other, and the United States has also adopted certain targeted measures such as export controls or sanctions implicating Chinese companies and officials. While certain trade agreements have been agreed between the two countries, there remains much uncertainty as to whether the trade negotiations between the United States and China will be successful and how the trade war between the United States and China will progress. Uncertainty regarding the outcome of the trade tensions and the potential for a trade war could cause the U.S. dollar to decline against safe haven currencies, such as the Japanese yen and the Euro. Events such as these and their consequences are difficult to predict and it is unclear whether further tariffs may be imposed or other escalating actions may be taken in the future. If the trade war between the United States and China continues or escalates, or if additional tariffs or trade restrictions are implemented by the United States, China or other countries in connection with a global trade war, there could be material adverse effects on the global economy, and the Trust and its portfolio investments could be materially and adversely affected. On January 31, 2020, the United Kingdom officially left the European Union (Brexit), subject to a transitional period that ended December 31, 2020. The United Kingdom and European Union have reached an agreement on the terms of their future trading relationship effective January 1, 2021, which principally relates to the trading of goods rather than services, including financial services. Further discussions are to be held between the United Kingdom and the European Union in relation to matters not covered by the trade agreement, such as financial services. The Trust faces risks associated with the potential uncertainty and consequences that may follow Brexit, including with respect to volatility in exchange rates and interest rates. Brexit could adversely affect European or worldwide political, regulatory, economic or market conditions and could contribute to instability in global political institutions, regulatory agencies and financial markets. Brexit has also led to legal uncertainty and could lead to politically divergent national laws and regulations as a new relationship between the United Kingdom and European Union is defined and the United Kingdom determines which European Union laws to replace or replicate. Any of these effects of Brexit could adversely affect any of the companies to which the Trust has exposure and any other assets that the Trust invests in. The political, economic and legal consequences of Brexit are not yet known. In the short term, financial markets may experience heightened volatility, particularly those in the United Kingdom and Europe, but possibly worldwide. The United Kingdom and Europe may be less stable than they have been in recent years, and investments in the United Kingdom and the European Union may be difficult to value or subject to greater or more frequent volatility. In the longer term, there is likely to be a period of significant political, regulatory and commercial uncertainty as the United Kingdom continues to negotiate the terms of its future trading relationship with the European Union. Cybersecurity incidents affecting particular companies or industries may adversely affect the economies of particular countries, regions or parts of the world in which the Trust invests. The occurrence of any of these above events could have a significant adverse impact on the value and risk profile of the Trust’s portfolio. The Trust does not know how long the securities markets may be affected by similar events and cannot predict the effects of similar events in the future on the U.S. economy and securities markets. There can be no assurance that similar events and other market disruptions will not have other material and adverse implications. Regulation and Government Intervention Risk Federal, state, and other governments, their regulatory agencies or self-regulatory organizations may take actions that affect the regulation of the issuers in which the Trust invests in ways that are unforeseeable. Legislation or regulation may also change the way in which the Trust is regulated. Such legislation or regulation could limit or preclude the Trust’s ability to achieve its investment objective. In light of popular, political and judicial focus on finance related consumer protection, financial institution practices are also subject to greater scrutiny and criticism generally. In the case of transactions between financial institutions and the general public, there may be a greater tendency toward strict interpretation of terms and legal rights in favor of the consuming public, particularly where there is a real or perceived disparity in risk allocation and/or where consumers are perceived as not having had an opportunity to exercise informed consent to the transaction. In the event of conflicting interests between retail investors holding common shares of a closed-end investment company such as the Trust and a large financial institution, a court may similarly seek to strictly interpret terms and legal rights in favor of retail investors. The Trust may be affected by governmental action in ways that are not foreseeable, and there is a possibility that such actions could have a significant adverse effect on the Trust and its ability to achieve its investment objective. Investment Company Act Regulations The Trust is a registered closed-end management investment company and as such is subject to regulations under the Investment Company Act. Generally speaking, any contract or provision thereof that is made, or where performance involves a violation of the Investment Company Act or any rule or regulation thereunder is unenforceable by either party unless a court finds otherwise. Regulation as a “Commodity Pool” The CFTC subjects advisers to registered investment companies to regulation by the CFTC if a fund that is advised by the investment adviser either (i) invests, directly or indirectly, more than a prescribed level of its liquidation value in CFTC-regulated futures, options and swaps (“CFTC Derivatives”), or (ii) markets itself as providing investment exposure to such instruments. To the extent the Trust uses CFTC Derivatives, it intends to do so below such prescribed levels and will not market itself as a “commodity pool” or a vehicle for trading such instruments. Accordingly, the Advisor has claimed an exclusion from the definition of the term “commodity pool operator” under the Commodity Exchange Act (“CEA”) pursuant to Rule 4.5 under the CEA. The Advisor is not, therefore, subject to registration or regulation as a “commodity pool operator” under the CEA in respect of the Trust. Failures of Futures Commission Merchants and Clearing Organizations Risk The Trust is required to deposit funds to margin open positions in cleared derivative instruments (both futures and swaps) with a clearing broker registered as a “futures commission merchant” (“FCM”). The CEA requires an FCM to segregate all funds received from customers with respect to any orders for the purchase or sale of U.S. domestic futures contracts and cleared swaps from the FCM’s proprietary assets. Similarly, the CEA requires each FCM to hold in a separate secure account all funds received from customers with respect to any orders for the purchase or sale of foreign futures contracts and segregate any such funds from the funds received with respect to domestic futures contracts. However, all funds and other property received by an FCM from its customers are held by an FCM on a commingled basis in an omnibus account and amounts in excess of assets posted to the clearing organization may be invested by an FCM in certain instruments permitted under the applicable regulation. There is a risk that assets deposited by the Trust with any FCM as margin for futures contracts or commodity options may, in certain circumstances, be used to satisfy losses of other clients of the Trust’s FCM. In addition, the assets of the Trust posted as margin against both swaps and futures contracts may not be fully protected in the event of the FCM’s bankruptcy. Legal, Tax and Regulatory Risks Legal, tax and regulatory changes could occur that may have material adverse effects on the Trust. To qualify for the favorable U.S. federal income tax treatment generally accorded to RICs, the Trust must, among other things, derive in each taxable year at least 90% of its gross income from certain prescribed sources and distribute for each taxable year at least 90% of its “investment company taxable income” (generally, ordinary income plus the excess, if any, of net short-term capital gain over net long-term capital loss). If for any taxable year the Trust does not qualify as a RIC, all of its taxable income for that year (including its net capital gain) would be subject to tax at regular corporate rates without any deduction for distributions to shareholders, and such distributions would be taxable as ordinary dividends to the extent of the Trust’s current and accumulated earnings and profits. The current presidential administration has called for significant changes to U.S. fiscal, tax, trade, healthcare, immigration, foreign, and government regulatory policy. In this regard, there is significant uncertainty with respect to legislation, regulation and government policy at the federal level, as well as the state and local levels. Recent events have created a climate of heightened uncertainty and introduced new and difficult-to-quantify macroeconomic and political risks with potentially far-reaching implications. There has been a corresponding meaningful increase in the uncertainty surrounding interest rates, inflation, foreign exchange rates, trade volumes and fiscal and monetary policy. To the extent the U.S. Congress or the current presidential administration implements changes to U.S. policy, those changes may impact, among other things, the U.S. and global economy, international trade and relations, unemployment, immigration, corporate taxes, healthcare, the U.S. regulatory environment, inflation and other areas. Although the Trust cannot predict the impact, if any, of these changes to the Trust’s business, they could adversely affect the Trust’s business, financial condition, operating results and cash flows. Until the Trust knows what policy changes are made and how those changes impact the Trust’s business and the business of the Trust’s competitors over the long term, the Trust will not know if, overall, the Trust will benefit from them or be negatively affected by them. The rules dealing with U.S. federal income taxation are constantly under review by persons involved in the legislative process and by the Internal Revenue Service and the U.S. Treasury Department. Revisions in U.S. federal tax laws and interpretations of these laws could adversely affect the tax consequences of your investment. Potential Conflicts of Interest of the Advisor, Sub-Advisor and Others The investment activities of the Advisor, the Sub-Advisor and their affiliates (including BlackRock, Inc. and its subsidiaries (collectively, the “Affiliates”)), and their respective directors, officers or employees, in managing their own accounts and other accounts, may present conflicts of interest that could disadvantage the Trust and its shareholders. The Advisor and its Affiliates may engage in proprietary trading and advise accounts and other funds that have investment objectives similar to those of the Trust and/or that engage in and compete for transactions in the same or similar types of securities, currencies and other assets as are held by the Trust. Subject to the requirements of the Investment Company Act, the Advisor and its Affiliates intend to engage in such activities and may receive compensation from third parties for their services. Neither the Advisor nor any Affiliate is under any obligation to share any investment opportunity, idea or strategy with the Trust. As a result, an Affiliate may compete with the Trust for appropriate investment opportunities. The results of the Trust’s investment activities, therefore, may differ from those of an Affiliate and of other accounts managed by an Affiliate. It is possible that the Trust could sustain losses during periods in which one or more Affiliates and other accounts achieve profits on their trading for proprietary or other accounts. The opposite result is also possible. The Advisor has adopted policies and procedures designed to address potential conflicts of interest. For additional information about potential conflicts of interest and the way in which BlackRock addresses such conflicts, please see “Conflicts of Interest” and “Management of the Trust—Portfolio Management—Potential Material Conflicts of Interest” in the SAI. Decision-Making Authority Risk Investors have no authority to make decisions or to exercise business discretion on behalf of the Trust, except as set forth in the Trust’s governing documents. The authority for all such decisions is generally delegated to the Board, which in turn, has delegated the day-to-day management of the Trust’s investment activities to the Advisors, subject to oversight by the Board. Management Risk The Trust is subject to management risk because it is an actively managed investment portfolio. The Advisors and the individual portfolio managers will apply investment techniques and risk analyses in making investment decisions for the Trust, but there can be no guarantee that these will produce the desired results. The Trust may be subject to a relatively high level of management risk because the Trust may invest in derivative instruments, which may be highly specialized instruments that require investment techniques and risk analyses different from those associated with equities and bonds. Valuation Risk The Trust is subject to valuation risk, which is the risk that one or more of the securities in which the Trust invests are valued at prices that the Trust is unable to obtain upon sale due to factors such as incomplete data, market instability or human error. The Advisor may use an independent pricing service or prices provided by dealers to value securities at their market value. Because the secondary markets for certain investments may be limited, such instruments may be difficult to value. See “Net Asset Value.” When market quotations are not available, the Advisor may price such investments pursuant to a number of methodologies, such as computer-based analytical modeling or individual security evaluations. These methodologies generate approximations of market values, and there may be significant professional disagreement about the best methodology for a particular type of financial instrument or different methodologies that might be used under different circumstances. In the absence of an actual market transaction, reliance on such methodologies is essential, but may introduce significant variances in the ultimate valuation of the Trust’s investments. Technological issues and/or errors by pricing services or other third-party service providers may also impact the Trust’s ability to value its investments and the calculation of the Trust’s NAV. When market quotations are not readily available or are believed by the Advisor to be unreliable, the Advisor will fair value the Trust’s investments in accordance with its policies and procedures. Fair value represents a good faith approximation of the value of an asset or liability. The fair value of an asset or liability held by the Trust is the amount the Trust might reasonably expect to receive from the current sale of that asset or the cost to extinguish that liability in an arm’s-length transaction. Fair value pricing may require determinations that are inherently subjective and inexact about the value of a security or other asset. As a result, there can be no assurance that fair value priced assets will not result in future adjustments to the prices of securities or other assets, or that fair value pricing will reflect a price that the Trust is able to obtain upon sale, and it is possible that the fair value determined for a security or other asset will be materially different from quoted or published prices, from the prices used by others for the same security or other asset and/or from the value that actually could be or is realized upon the sale of that security or other asset. For example, the Trust’s NAV could be adversely affected if the Trust’s determinations regarding the fair value of the Trust’s investments were materially higher than the values that the Trust ultimately realizes upon the disposal of such investments. Where market quotations are not readily available, valuation may require more research than for more liquid investments. In addition, elements of judgment may play a greater role in valuation in such cases than for investments with a more active secondary market because there is less reliable objective data available. Because of overall size, duration and maturities of positions held by the Trust, the value at which its investments can be liquidated may differ, sometimes significantly, from the interim valuations obtained by the Trust. In addition, the timing of liquidations may also affect the values obtained on liquidation. Securities held by the Trust may routinely trade with bid-offer spreads that may be significant. There can be no guarantee that the Trust’s investments could ultimately be realized at the Trust’s valuation of such investments. In addition, the Trust’s compliance with the asset diversification tests applicable to regulated investment companies depends on the fair market values of the Trust’s assets, and, accordingly, a challenge to the valuations ascribed by the Trust could affect its ability to comply with those tests or require it to pay penalty taxes in order to cure a violation thereof. The Trust’s NAV per common share is a critical component in several operational matters including computation of advisory and services fees. Consequently, variance in the valuation of the Trust’s investments will impact, positively or negatively, the fees and expenses shareholders will pay. Reliance on the Advisors Risk The Trust is dependent upon services and resources provided by the Advisors, and therefore the Advisors’ parent, BlackRock. The Advisors are not required to devote their full time to the business of the Trust and there is no guarantee or requirement that any investment professional or other employee of the Advisors will allocate a substantial portion of his or her time to the Trust. The loss of one or more individuals involved with the Advisors could have a material adverse effect on the performance or the continued operation of the Trust. For additional information on the Advisors and BlackRock, see “Management of the Trust—Investment Advisor and Sub-Advisor.” Reliance on Service Providers Risk The Trust must rely upon the performance of service providers to perform certain functions, which may include functions that are integral to the Trust’s operations and financial performance. Failure by any service provider to carry out its obligations to the Trust in accordance with the terms of its appointment, to exercise due care and skill or to perform its obligations to the Trust at all as a result of insolvency, bankruptcy or other causes could have a material adverse effect on the Trust’s performance and returns to shareholders. The termination of the Trust’s relationship with any service provider, or any delay in appointing a replacement for such service provider, could materially disrupt the business of the Trust and could have a material adverse effect on the Trust’s performance and returns to shareholders. Information Technology Systems Risk The Trust is dependent on the Advisors for certain management services as well as back-office functions. The Advisors depend on information technology systems in order to assess investment opportunities, strategies and markets and to monitor and control risks for the Trust. It is possible that a failure of some kind which causes disruptions to these information technology systems could materially limit the Advisors’ ability to adequately assess and adjust investments, formulate strategies and provide adequate risk control. Any such information technology-related difficulty could harm the performance of the Trust. Further, failure of the back-office functions of the Advisors to process trades in a timely fashion could prejudice the investment performance of the Trust. Operational and Technology Risks The Trust and the entities with which it interacts directly or indirectly are susceptible to operational and technology risks, including those related to human errors, processing errors, communication errors, systems failures, cybersecurity incidents, and the use of artificial intelligence and machine learning (“AI”), which may result in losses for the Trust and its shareholders or impair the Trust’s operations. These entities include, but are not limited to, the Trust’s adviser, administrator, distributor, other service providers (e.g., index and benchmark providers, accountants, custodians, and transfer agents), financial intermediaries, counterparties, market makers, authorized participants, listing exchanges, other financial market operators, and governmental authorities. Operational and technology risks for the issuers in which the Trust invests could also result in material adverse consequences for such issuers and may cause the Trust’s investments in such issuers to lose value. The Trust may incur substantial costs in order to mitigate operational and technology risks. Cybersecurity incidents can result from deliberate attacks or unintentional events against an issuer in which the Trust invests, the Trust or any of its service providers. They include, but are not limited to, gaining unauthorized access to systems, misappropriating assets or sensitive information, corrupting or destroying data, and causing operational disruption. Geopolitical tension may increase the scale and sophistication of deliberate attacks, particularly those from nation states or from entities with nation state backing. Cybersecurity incidents may result in any of the following: financial losses; interference with the Trust’s ability to calculate its NAV; disclosure of confidential information; impediments to trading; submission of erroneous trades by the Trust or erroneous subscription or redemption orders; the inability of the Trust or its service providers to transact business; violations of applicable privacy and other laws; regulatory fines; penalties; reputational damage; reimbursement or other compensation costs; and other legal and compliance expenses. Furthermore, cybersecurity incidents may render records of the Trust, including records relating to its assets and transactions, shareholder ownership of Trust shares, and other data integral to the Trust’s functioning, inaccessible, inaccurate or incomplete. Power outages, natural disasters, equipment malfunctions and processing errors that threaten information and technology systems relied upon by the Trust or its service providers, as well as market events that occur at a pace that overloads these systems, may also disrupt business operations or impact critical data. In addition, the risks of increased use of AI technologies, such as machine learning, include data risk, transparency risk, and operational risk. The AI technologies, which are generally highly reliant on the collection and analysis of large amounts of data, may incorporate biased or inaccurate data, and it is not possible or practicable to incorporate all relevant data into such technologies. The output or results of any such AI technologies may therefore be incomplete, erroneous, distorted or misleading. Further, AI tools may lack transparency as to how data is utilized and how outputs are generated. AI technologies may also allow the unintended introduction of vulnerabilities into infrastructures and applications. The Trust and its shareholders could be negatively impacted as a result of these risks associated with AI technologies. AI technologies and their current and potential future applications, and the regulatory frameworks within which they operate, continue to quickly evolve, and it is impossible to anticipate the full scope of future AI capabilities or rules and the associated risks to the Trust. While the Trust’s service providers are required to have appropriate operational, information security and cybersecurity risk management policies and procedures, their methods of risk management may differ from those of the Trust in the setting of priorities, the personnel and resources available or the effectiveness of relevant controls. The Trust and its adviser seek to reduce these risks through controls, procedures and oversight, including establishing business continuity plans and risk management systems. However, there are inherent limitations in such plans and systems, including the possibility that certain risks that may affect the Trust have not been identified or may emerge in the future; that such plans and systems may not completely eliminate the occurrence or mitigate the effects of operational or information security disruptions or failures or of cybersecurity incidents; or that prevention and remediation efforts will not be successful or that incidents will go undetected. The Trust cannot control the systems, information security or other cybersecurity of the issuers in which it invests or its service providers, counterparties, and other third parties whose activities affect the Trust. Lastly, the regulatory climate governing cybersecurity and data protection is developing quickly and may vary considerably across jurisdictions. Regulators continue to develop new rules and standards related to cybersecurity and data protection. Compliance with evolving regulations can be demanding and costly, requiring substantial resources to monitor and implement required changes. Misconduct of Employees and of Service Providers Risk Misconduct or misrepresentations by employees of the Advisors or the Trust’s service providers could cause significant losses to the Trust. Employee misconduct may include binding the Trust to transactions that exceed authorized limits or present unacceptable risks and unauthorized trading activities, concealing unsuccessful trading activities (which, in any case, may result in unknown and unmanaged risks or losses) or making misrepresentations regarding any of the foregoing. Losses could also result from actions by the Trust’s service providers, including, without limitation, failing to recognize trades and misappropriating assets. In addition, employees and service providers may improperly use or disclose confidential information, which could result in litigation or serious financial harm, including limiting the Trust’s business prospects or future marketing activities. Despite the Advisors’ due diligence efforts, misconduct and intentional misrepresentations may be undetected or not fully comprehended, thereby potentially undermining the Advisors’ due diligence efforts. As a result, no assurances can be given that the due diligence performed by the Advisors will identify or prevent any such misconduct. Portfolio Turnover Risk The Trust’s annual portfolio turnover rate may vary greatly from year to year, as well as within a given year. Portfolio turnover rate is not considered a limiting factor in the execution of investment decisions for the Trust. A higher portfolio turnover rate results in correspondingly greater brokerage commissions and other transactional expenses that are borne by the Trust. High portfolio turnover may result in an increased realization of net short-term capital gains by the Trust which, when distributed to common shareholders, will be taxable as ordinary income. Additionally, in a declining market, portfolio turnover may create realized capital losses. Not a Complete Investment Program The Trust is intended for investors seeking a high level of total return, through a combination of current income, current gains and long-term capital appreciation. The Trust is not meant to provide a vehicle for those who wish to exploit short-term swings in the stock market and is intended for long-term investors. An investment in shares of the Trust should not be considered a complete investment program. Each shareholder should take into account the Trust’s investment objective as well as the shareholder’s other investments when considering an investment in the Trust. Anti-Takeover Provisions Risk The Trust’s Agreement and Declaration of Trust and Bylaws include provisions that could limit the ability of other entities or persons to acquire control of the Trust or convert the Trust to open-end status or to change the composition of the Board. 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 Trust. See “Certain Provisions in the Agreement and Declaration of Trust and Bylaws.” |  |  |  |  |  |  |  |  |  |
Share Price [Table Text Block] |  | The Trust’s outstanding common shares are, and when issued, the common shares offered by this Prospectus will be, publicly held and listed and traded on the NYSE under the symbol “BUI.” The Trust determines its NAV on a daily basis. The following table sets forth, for the quarters indicated, the highest and lowest daily closing prices on the NYSE per common share, and the NAV per common share and the premium to or discount from NAV, on the date of each of the high and low market prices. The table also sets forth the number of common shares traded on the NYSE during the respective quarters.
During Quarter Ended |  | NYSE Market Price Per Common Share |  | NAV per Common Share on Date of Market Price |  | Premium/(Discount) on Date of Market Price |  |  | Trading Volume |  |
|  | High |  | Low |  | High |  | Low |  | High |  |  | Low |  |  |  |  |
March 31, 2025 |  | $ 23.74 |  | $ 22.20 |  | $ 23.92 |  | $ 22.28 |  |  | (0.75)% |  |  |  | (0.38)% |  |  | 3,240,144 |  |
December 31, 2024 |  | $ 24.27 |  | $ 22.12 |  | $ 24.41 |  | $ 22.44 |  |  | (0.16)% |  |  |  | (1.43)% |  |  | 3,031,403 |  |
September 30, 2024 |  | $ 24.83 |  | $ 22.14 |  | $ 24.43 |  | $ 22.30 |  |  | 1.64% |  |  |  | (0.72)% |  |  | 2,940,462 |  |
June 30, 2024 |  | $ 23.03 |  | $ 20.20 |  | $ 22.97 |  | $ 21.24 |  |  | 0.26% |  |  |  | (4.90)% |  |  | 3,430,077 |  |
March 31, 2024 |  | $ 22.24 |  | $ 20.57 |  | $ 22.28 |  | $ 21.47 |  |  | (0.18)% |  |  |  | (4.19)% |  |  | 3,733,789 |  |
December 31, 2023 |  | $ 21.82 |  | $ 18.75 |  | $ 22.54 |  | $ 19.79 |  |  | (3.19)% |  |  |  | (5.26)% |  |  | 4,511,140 |  |
September 30, 2023 |  | $ 23.34 |  | $ 19.64 |  | $ 23.35 |  | $ 20.42 |  |  | (0.04)% |  |  |  | (3.82)% |  |  | 3,117,194 |  |
June 30, 2023 |  | $ 23.98 |  | $ 21.56 |  | $ 22.97 |  | $ 22.18 |  |  | 4.40% |  |  |  | (2.80)% |  |  | 2,817,221 |  |
March 31, 2023 |  | $ 23.98 |  | $ 20.99 |  | $ 22.97 |  | $ 22.33 |  |  | 4.40% |  |  |  | (6.00)% |  |  | 3,092,154 |  |
As of May 16, 2025, the NAV per common share of the Trust was $24.10 and the market price per common share was $24.37, representing a premium to NAV of 1.10%. Common shares of the Trust have historically traded at both a premium and discount to NAV. As of May 16, 2025, the Trust has 22,706,449 common shares outstanding. |  |  |  |  |  |  |  |  |  |
Capital Stock, Long-Term Debt, and Other Securities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock [Table Text Block] |  | DESCRIPTION OF SHARES Common Shares The Trust is a statutory trust formed under the laws of Delaware and governed by an Agreement and Declaration of Trust, dated as of August 25, 2011 (the “Agreement and Declaration of Trust”). The Trust is authorized to issue an unlimited number of common shares of beneficial interest, par value $0.001 per share. Each common share has one vote and, when issued and paid for in accordance with the terms of this offering, will be fully paid and, under the Delaware Statutory Trust Act, the purchasers of the common shares will have no obligation to make further payments for the purchase of the common shares or contributions to the Trust solely by reason of their ownership of the common shares, except that the Trustees shall have the power to cause shareholders to pay certain expenses of the Trust by setting off charges due from shareholders from declared but unpaid dividends or distributions owed the shareholders and/or by reducing the number of common shares owned by each respective shareholder. If and whenever preferred shares are outstanding, the holders of common shares will not be entitled to receive any distributions from the Trust unless all accrued dividends on preferred shares have been paid, unless asset coverage (as defined in the Investment Company Act) with respect to preferred shares would be at least 200% after giving effect to the distributions and unless certain other requirements imposed by any rating agencies rating the preferred shares have been met. See “Description of Shares—Preferred Shares” in the SAI. All common shares are equal as to dividends, assets and voting privileges and have no conversion, preemptive or other subscription rights. The Trust will send annual and semi-annual reports, including financial statements, to all holders of its shares. Unlike open-end funds, closed-end funds like the Trust do not continuously offer shares and do not provide daily redemptions. Rather, if a shareholder determines to buy additional common shares or sell shares already held, the shareholder may do so by trading through a broker on the NYSE or otherwise. Shares of closed-end investment companies frequently trade on an exchange at prices lower than NAV. Shares of closed-end investment companies like the Trust have during some periods traded at prices higher than NAV and during other periods have traded at prices lower than NAV. Because the market value of the common shares may be influenced by such factors as dividend levels (which are in turn affected by expenses), call protection on its portfolio securities, dividend stability, portfolio credit quality, the Trust’s NAV, relative demand for and supply of such shares in the market, general market and economic conditions and other factors beyond the control of the Trust, the Trust cannot assure you that its common shares will trade at a price equal to or higher than NAV in the future. The common shares are designed primarily for long-term investors and you should not purchase the common shares if you intend to sell them soon after purchase. See “Repurchase of Common Shares” below and “Repurchase of Common Shares” in the SAI. The Trust’s outstanding common shares are, and when issued, the common shares offered by this Prospectus will be, publicly held and listed and traded on the NYSE under the symbol “BUI.” The Trust determines its NAV on a daily basis. The following table sets forth, for the quarters indicated, the highest and lowest daily closing prices on the NYSE per common share, and the NAV per common share and the premium to or discount from NAV, on the date of each of the high and low market prices. The table also sets forth the number of common shares traded on the NYSE during the respective quarters.
During Quarter Ended |  | NYSE Market Price Per Common Share |  | NAV per Common Share on Date of Market Price |  | Premium/(Discount) on Date of Market Price |  |  | Trading Volume |  |
|  | High |  | Low |  | High |  | Low |  | High |  |  | Low |  |  |  |  |
March 31, 2025 |  | $ 23.74 |  | $ 22.20 |  | $ 23.92 |  | $ 22.28 |  |  | (0.75)% |  |  |  | (0.38)% |  |  | 3,240,144 |  |
December 31, 2024 |  | $ 24.27 |  | $ 22.12 |  | $ 24.41 |  | $ 22.44 |  |  | (0.16)% |  |  |  | (1.43)% |  |  | 3,031,403 |  |
September 30, 2024 |  | $ 24.83 |  | $ 22.14 |  | $ 24.43 |  | $ 22.30 |  |  | 1.64% |  |  |  | (0.72)% |  |  | 2,940,462 |  |
June 30, 2024 |  | $ 23.03 |  | $ 20.20 |  | $ 22.97 |  | $ 21.24 |  |  | 0.26% |  |  |  | (4.90)% |  |  | 3,430,077 |  |
March 31, 2024 |  | $ 22.24 |  | $ 20.57 |  | $ 22.28 |  | $ 21.47 |  |  | (0.18)% |  |  |  | (4.19)% |  |  | 3,733,789 |  |
December 31, 2023 |  | $ 21.82 |  | $ 18.75 |  | $ 22.54 |  | $ 19.79 |  |  | (3.19)% |  |  |  | (5.26)% |  |  | 4,511,140 |  |
September 30, 2023 |  | $ 23.34 |  | $ 19.64 |  | $ 23.35 |  | $ 20.42 |  |  | (0.04)% |  |  |  | (3.82)% |  |  | 3,117,194 |  |
June 30, 2023 |  | $ 23.98 |  | $ 21.56 |  | $ 22.97 |  | $ 22.18 |  |  | 4.40% |  |  |  | (2.80)% |  |  | 2,817,221 |  |
March 31, 2023 |  | $ 23.98 |  | $ 20.99 |  | $ 22.97 |  | $ 22.33 |  |  | 4.40% |  |  |  | (6.00)% |  |  | 3,092,154 |  |
As of May 16, 2025, the NAV per common share of the Trust was $24.10 and the market price per common share was $24.37, representing a premium to NAV of 1.10%. Common shares of the Trust have historically traded at both a premium and discount to NAV. As of May 16, 2025, the Trust has 22,706,449 common shares outstanding. Preferred Shares The Trust has no current intention of issuing preferred shares. Under the Investment Company Act, the Trust is not permitted to issue preferred shares unless immediately after such issuance the value of the Trust’s total assets is at least 200% of the liquidation value of the outstanding preferred shares (i.e., the liquidation value may not exceed 50% of the Trust’s total assets). In addition, the Trust is not permitted to declare any cash dividend or other distribution on its common shares unless, at the time of such declaration, the value of the Trust’s total assets is at least 200% of such liquidation value. If the Trust issues preferred shares, it may be subject to restrictions imposed by the guidelines of one or more rating agencies that may issue ratings for preferred shares issued by the Trust. These guidelines may impose asset coverage or portfolio composition requirements that are more stringent than those imposed on the Trust by the Investment Company Act. It is not anticipated that these covenants or guidelines would impede the Advisors from managing the Trust’s portfolio in accordance with the Trust’s investment objective and policies. Please see “Description of Shares” in the SAI for more information. Authorized Shares The following table provides the Trust’s authorized shares and common shares outstanding as of May 16, 2025.
Title of Class |  | Amount Authorized |  | Amount Held by Trust or for its Account |  |  | Amount Outstanding Exclusive of Amount held by Trust |
Common Shares |  | Unlimited |  | $ |  |  |  |  | 0 |  |  | $ |  |  |  |  | 22,706,449 |
Outstanding Securities [Table Text Block] |  | Authorized Shares The following table provides the Trust’s authorized shares and common shares outstanding as of May 16, 2025.
Title of Class |  | Amount Authorized |  | Amount Held by Trust or for its Account |  |  | Amount Outstanding Exclusive of Amount held by Trust |
Common Shares |  | Unlimited |  | $ |  |  |  |  | 0 |  |  | $ |  |  |  |  | 22,706,449 |
Focus Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Focus Risk The Trust invests significantly in issuers in the Utilities, Infrastructure and Power Opportunities business segments. Because the Trust invests significantly in those business segments, it may be subject to more risks than if it were broadly diversified over numerous industries and sectors of the economy. General changes in market sentiment towards Utilities, Infrastructure and Power Opportunities companies may adversely affect the Trust, and the performance of Utilities, Infrastructure and Power Opportunities issuers may lag behind the broader market as a whole. Also, the Trust’s focus on the Utilities, Infrastructure and Power Opportunities business segments may subject the Trust to a variety risks associated with those business segments. |  |  |  |  |  |  |  |  |  |
Additional Risks of Investing in Utilities Infrastructure and Power Opportunities Issuers [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Additional Risks of Investing in Utilities, Infrastructure and Power Opportunities Issuers Investments in issuers in the Utilities, Infrastructure and Power Opportunities business segments are subject to certain risks, including the following: Technological Risk. Technological changes in the way a service or product is delivered may render existing technologies obsolete. Although this risk may be considered low with respect to assets of Utilities, Infrastructure and Power Opportunities companies given the large fixed costs involved in developing such assets and the fact that many utilities, infrastructure and power opportunities technologies are well established, any technological change that occurs over the medium term could threaten the profitability of a Utilities, Infrastructure and Power Opportunities company. Utilities, Infrastructure and Power Opportunities assets have very few alternative uses should they become obsolete. Communications utilities may be particularly sensitive to these risks, as telecommunications products and services also may be subject to rapid obsolescence resulting from changes in consumer tastes, intense competition and strong market reactions to technological development. Developing Industries Risk. Some Utilities, Infrastructure and Power Opportunities companies are focused on developing new technologies and are strongly influenced by technological changes. Product development efforts by Utilities, Infrastructure and Power Opportunities companies may not result in viable commercial products. Utilities, Infrastructure and Power Opportunities companies may bear high research and development costs, which can limit their ability to maintain operations during periods of organizational growth or instability. Some Utilities, Infrastructure and Power Opportunities issuers may be in the early stages of operations and may have limited operating histories and smaller market capitalizations on average than companies in other sectors. As a result of these and other factors, the value of investments in such Utilities, Infrastructure and Power Opportunities issuers may be considerably more volatile than that in more established segments of the economy. Regional Risk. Should an event that impairs assets or facilities occur in a region where a Utilities, Infrastructure and Power Opportunities issuer operates, the performance of such Utilities, Infrastructure and Power Opportunities company may be adversely affected. As many infrastructure assets are not moveable, such an event may have enduring effects on the Utilities, Infrastructure and Power Opportunities company that are difficult to mitigate. Strategic Asset Risk. Utilities, Infrastructure and Power Opportunities companies may control significant strategic assets. Strategic assets are assets that have a national or regional profile, and may have monopolistic characteristics. Given the national or regional profile and/or their irreplaceable nature, strategic assets may constitute a higher risk target for terrorist acts or adverse political actions. Environmental Risk. Utilities, Infrastructure and Power Opportunities companies can have substantial environmental impacts. Ordinary operations or operational accidents may cause major environmental damage, which could cause Utilities, Infrastructure and Power Opportunities companies significant financial distress. For example, an accidental release from wells or gathering pipelines could subject them to substantial liabilities for environmental cleanup and restoration costs, claims made by neighboring landowners and other third parties for personal injury and property damage, and fines or penalties for related violations of environmental laws or regulations. Utilities, Infrastructure and Power Opportunities companies may not be able to recover these costs from insurance. Environmental regulations to which Utilities, Infrastructure and Power Opportunities companies may be subject include, for example: (i) the federal Clean Air Act and comparable state laws and regulations that impose obligations related to air emissions, (ii) the federal Clean Water Act and comparable state laws and regulations that impose obligations related to discharges of pollutants into regulated bodies of water, (iii) the federal Resource Conservation and Recovery Act (“RCRA”) and comparable state laws and regulations that impose requirements for the handling and disposal of waste from facilities; and (iv) the federal Comprehensive Environmental Response, Compensation and Liability Act of 1980 (“CERCLA”), also known as “Superfund,” and comparable state laws and regulations that regulate the cleanup of hazardous substances. Failure to comply with these laws and regulations may trigger a variety of administrative, civil and criminal enforcement measures, including the assessment of monetary penalties, the imposition of remedial requirements, and the issuance of orders enjoining future operations. Certain environmental statutes, including RCRA, CERCLA, the federal Oil Pollution Act and analogous state laws and regulations, impose strict, joint and several liability for costs required to clean up and restore sites where hazardous substances have been disposed of or otherwise released. Voluntary initiatives and mandatory controls have been adopted or are being discussed both in the United States and worldwide to reduce emissions of “greenhouse gases” such as carbon dioxide, a by-product of burning fossil fuels, and methane, the major constituent of natural gas, which many scientists and policymakers believe contribute to global climate change. These measures and future measures could result in increased costs to certain companies in which the Trust may invest to operate and maintain facilities and administer and manage a greenhouse gas emissions program and may reduce demand for fuels that generate greenhouse gases and that are managed or produced by companies in which the Trust may invest. Following a series of Supreme Court decisions, the Environmental Protection Agency (“EPA”) continues to regulate greenhouse gas emissions under the Clean Air Act, although the scope of that authority is subject to ongoing litigation and may change. The EPA and the National Highway Traffic Safety Administration have issued successive rounds of greenhouse gas and fuel economy standards which may increase compliance costs for transportation fuel suppliers and could dampen long-term demand for fossil fuels, which may adversely affect certain of the Trust’s investments. Community and environmental groups may protest the development or operation of assets or facilities of Utilities, Infrastructure and Power Opportunities companies, and these protests may induce government action to the detriment of Utilities, Infrastructure and Power Opportunities companies. Political and Expropriation Risk. Governments may attempt to influence the operations, revenue, profitability or contractual relationships of Utilities, Infrastructure and Power Opportunities issuers or expropriate their assets. The public interest aspect of the products and services provided by Utilities, Infrastructure and Power Opportunities companies means political oversight will remain pervasive. Operational Risk. The long-term profitability of Utilities, Infrastructure and Power Opportunities companies is partly dependent on the efficient operation and maintenance of their assets and facilities. Utilities, Infrastructure and Power Opportunities issuers may be subject to service interruptions due to environmental disasters, operational accidents or terrorist activities, which may impair their ability to maintain payments of dividends or interest to investors. The destruction or loss of an asset or facility may have a major adverse impact on a Utilities, Infrastructure and Power Opportunities issuer. Failure by the Utilities, Infrastructure and Power Opportunities issuer to operate and maintain their assets and facilities appropriately or to carry appropriate, enforceable insurance could lead to significant losses. Regulatory Risk. Many Utilities, Infrastructure and Power Opportunities companies are subject to significant federal, state and local government regulation, which may include how facilities are constructed, maintained and operated, environmental and safety controls and the prices they may charge for the products and services they provide. Various governmental authorities have the power to enforce compliance with these regulations and the permits issued under them, and violators are subject to administrative, civil and criminal penalties, including civil fines, injunctions or both. There are substantial differences among the regulatory practices and policies of various jurisdictions, and any given regulatory agency may make major shifts in policy from time to time. Stricter laws, regulations or enforcement policies could be enacted in the future which would likely increase compliance costs and may adversely affect the operations and financial performance of Utilities, Infrastructure and Power Opportunities issuers. Regulators that have the power to set or modify the prices Utilities, Infrastructure and Power Opportunities issuers can charge for their products or services can have a significant impact on the profitability of such Utilities, Infrastructure and Power Opportunities issuers. The returns on regulated assets or services are usually stable during regulated periods, but may be volatile during any period that rates are reset by the regulator. Utilities, Infrastructure and Power Opportunities companies may be adversely affected by additional regulatory requirements enacted in response to environmental disasters, which may impose additional costs or limit certain operations by such companies operating in various sectors. Foreign Utilities, Infrastructure and Power Opportunities companies are also subject to regulation, although such regulations may or may not be comparable to those in the United States. Foreign Utilities, Infrastructure and Power Opportunities companies may be more heavily regulated by their respective governments than utilities in the United States and, as in the United States, generally are required to seek government approval for rate increases. In addition, many foreign Utilities, Infrastructure and Power Opportunities companies use fuels that may cause more pollution than those used in the United States, which may require such utilities to invest in pollution control equipment to meet any proposed pollution restrictions. Foreign regulatory systems vary from country to country and may evolve in ways different from regulation in the United States. Interest Rate Risk. Due to the high costs of developing, constructing, operating and distributing infrastructure assets, many Utilities, Infrastructure and Power Opportunities companies are highly leveraged. As such, movements in the level of interest rates may affect the returns from these assets. The structure and nature of the debt is therefore an important element to consider in assessing the interest rate risk posed by Utilities, Infrastructure and Power Opportunities issuers. In particular, the type of facilities, maturity profile, rates being paid, fixed versus variable components and covenants in place (including how they impact returns to equity holders) are crucial factors in assessing any the degree of interest rate risk. Inflation Risk. Many Utilities, Infrastructure and Power Opportunities companies may have fixed income streams and, therefore, be unable to increase their dividends during inflationary periods. The market value of Utilities, Infrastructure and Power Opportunities companies may decline in value in times of higher inflation rates. The prices that a Utilities, Infrastructure and Power Opportunities company is able to charge users of its assets may not always be linked to inflation. In this case, changes in the rate of inflation may affect the forecast profitability of the Utilities, Infrastructure and Power Opportunities. Supply and Demand Risk. Utilities, Infrastructure and Power Opportunities companies may be subject to supply and demand fluctuations in the markets they serve which will be impacted by a wide range of factors. A decrease in the production of natural gas, natural gas liquids, crude oil, coal or other energy commodities, a decrease in the volume of such commodities available for transportation, mining, processing, storage or distribution, or a sustained decline in demand for such commodities, may adversely impact the financial performance of Utilities, Infrastructure and Power Opportunities companies. Factors affecting the volume of production of energy commodities and the volume of energy commodities available for transportation, storage, processing or distribution include depletion of resources; depressed commodity prices; catastrophic events; labor relations; increased environmental or other governmental regulation; equipment malfunctions and maintenance difficulties; import volumes; international politics; policies of the Organization of Petroleum Exporting Countries; and increased competition from alternative energy sources. Alternatively, a decline in demand for energy commodities could result from factors such as adverse economic conditions (especially in key energy-consuming countries); increased taxation; weather conditions; increased environmental or other governmental regulation; increased fuel economy; increased energy conservation or use of alternative energy sources; legislation intended to promote the use of alternative energy sources; or increased commodity prices. Customer Risk. The revenue of many Utilities, Infrastructure and Power Opportunities companies may be impacted by the number of users who use the products or services produced by the Utilities, Infrastructure and Power Opportunities company. A significant decrease in the number of users may negatively impact the profitability of a Utilities, Infrastructure and Power Opportunities company. Infrastructure companies can have a narrow customer base. Should these customers or counterparties fail to pay their contractual obligations, significant revenues could cease and not be replaceable. This would affect the profitability of the infrastructure company and the value of any securities or other instruments it has issued. Project and Financing Risk. To the extent the Trust invests in Utilities, Infrastructure and Power Opportunities companies which are dependent to a significant extent on new infrastructure projects, the Trust may be exposed to the risk that the project will not be completed within budget, within the agreed time frame or to agreed specifications. From time to time, infrastructure companies may encounter difficulties in obtaining financing for construction programs during inflationary periods. Issuers experiencing difficulties in financing construction programs may also experience lower profitability, which can result in reduced income to the Trust. Weather and Natural Disasters Risk. Weather plays a role in the seasonality of some Utilities, Infrastructure and Power Opportunities companies’ cash flows. Although most Utilities, Infrastructure and Power Opportunities companies that are subject to weather risk can reasonably predict seasonal weather demand based on normal weather patterns, extreme weather conditions demonstrate that no amount of preparation can protect an Utilities, Infrastructure and Power Opportunities company from the unpredictability of the weather. Natural disaster risks, such as earthquakes, flood, lightning, hurricanes and wind, are risks facing certain Utilities, Infrastructure and Power Opportunities companies. The damage done by extreme weather or natural disasters also may serve to increase many Utilities, Infrastructure and Power Opportunities companies insurance premiums. |  |  |  |  |  |  |  |  |  |
Corporate Bonds Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Corporate Bonds Risk The market value of a corporate bond generally may be expected to rise and fall inversely with interest rates. The market value of intermediate and longer term corporate bonds is generally more sensitive to changes in interest rates than is the market value of shorter term corporate bonds. The market value of a corporate bond also may be affected by factors directly related to the issuer, such as investors’ perceptions of the creditworthiness of the issuer, the issuer’s financial performance, perceptions of the issuer in the market place, performance of management of the issuer, the issuer’s capital structure and use of financial leverage and demand for the issuer’s goods and services. Certain risks associated with investments in corporate bonds are described elsewhere in this Prospectus in further detail, including under “Risks—Inflation Risk” and “Risks—Deflation Risk.” There is a risk that the issuers of corporate bonds may not be able to meet their obligations on interest or principal payments at the time called for by an instrument. Corporate bonds of below investment grade quality are often high risk and have speculative characteristics and may be particularly susceptible to adverse issuer-specific developments. |  |  |  |  |  |  |  |  |  |
Unrated Securities Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Unrated Securities Risk The Trust may purchase securities that are not rated by any rating organization. The Advisors may, after assessing such securities’ credit quality, internally assign ratings to certain of those securities in categories similar to those of rating organizations. Some unrated securities may not have an active trading market or may be difficult to value, which means the Trust might have difficulty selling them promptly at an acceptable price. To the extent that the Trust invests in unrated securities, the Trust’s ability to achieve its investment objective will be more dependent on the Advisors’ credit analysis than would be the case when the Trust invests in rated securities. |  |  |  |  |  |  |  |  |  |
Dividend Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Dividend Risk Historically, Utilities, Infrastructure and Power Opportunities companies have generally paid dividends on their equity securities. However, dividends on common stocks are not fixed but are declared at the discretion of an issuer’s board of directors. There is no guarantee that the issuers of the common stocks in which the Trust invests will declare dividends in the future or that if declared they will remain at current levels or increase over time. As described further in “Tax Matters,” “qualified dividend income” received by the Trust and passed through to shareholders will generally be eligible for the reduced tax rates applicable to long-term capital gains realized by individuals. There is no assurance as to what portion of the Trust’s distributions will constitute qualified dividend income. |  |  |  |  |  |  |  |  |  |
Inflation Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Inflation Risk Inflation risk is the risk that the value of assets or income from investment will be worth less in the future, as inflation decreases the value of money. Inflation rates may change frequently and drastically as a result of various factors, including unexpected shifts in the domestic or global economy. As inflation increases, the real value of the common shares and distributions on those shares can decline. In addition, during any periods of rising inflation, interest rates on any borrowings by the Trust would likely increase, which would tend to further reduce returns to the holders of common shares. |  |  |  |  |  |  |  |  |  |
Deflation Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Deflation Risk Deflation risk is the risk that prices throughout the economy decline over time, which may have an adverse effect on the market valuation of companies, their assets and their revenues. In addition, deflation may have an adverse effect on the creditworthiness of issuers and may make issuer default more likely, which may result in a decline in the value of the Trust’s portfolio. |  |  |  |  |  |  |  |  |  |
Swaps Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Swaps Risk Swaps are a type of derivative. Swap agreements involve the risk that the party with which the Trust has entered into the swap will default on its obligation to pay the Trust and the risk that the Trust will not be able to meet its obligations to pay the other party to the agreement. To seek to hedge the value of the Trust’s portfolio, to hedge against increases in the Trust’s cost associated with interest payments on any outstanding borrowings or to increase the Trust’s return, the Trust may enter into swaps, including interest rate swap, total return swap (sometimes referred to as a “contract for difference”) and/or credit default swap transactions. In interest rate swap transactions, there is a risk that yields will move in the direction opposite of the direction anticipated by the Trust, which would cause the Trust to make payments to its counterparty in the transaction that could adversely affect Trust performance. In addition to the risks applicable to swaps generally (including counterparty risk, high volatility, liquidity risk and credit risk), credit default swap transactions involve special risks because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). Historically, swap transactions have been individually negotiated non-standardized transactions entered into in OTC markets and have not been subject to the same type of government regulation as exchange-traded instruments. However, since the global financial crisis, the OTC derivatives markets have become subject to comprehensive statutes and regulations. In particular, in the United States, the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 (the “Dodd-Frank Act”) requires that certain derivatives with U.S. persons must be executed on a regulated market and a substantial portion of OTC derivatives must be submitted for clearing to regulated clearinghouses. As a result, swap transactions entered into by the Trust may become subject to various requirements applicable to swaps under the Dodd-Frank Act, including clearing, exchange-execution, reporting and recordkeeping requirements, which may make it more difficult and costly for the Trust to enter into swap transactions and may also render certain strategies in which the Trust might otherwise engage impossible or so costly that they will no longer be economical to implement. Furthermore, the number of counterparties that may be willing to enter into swap transactions with the Trust may also be limited if the swap transactions with the Trust are subject to the swap regulation under the Dodd-Frank Act. Credit default and total return swap agreements may effectively add leverage to the Trust’s portfolio because, in addition to its Managed Assets, the Trust would be subject to investment exposure on the notional amount of the swap. Total return swap agreements are subject to the risk that a counterparty will default on its payment obligations to the Trust thereunder. The Trust is not required to enter into swap transactions for hedging purposes or to enhance income or gain and may choose not to do so. In addition, the swaps market is subject to a changing regulatory environment. It is possible that regulatory or other developments in the swaps market could adversely affect the Trust’s ability to successfully use swaps. |  |  |  |  |  |  |  |  |  |
Defensive Investing Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Defensive Investing Risk For defensive purposes, the Trust may allocate assets into cash or short-term fixed-income securities without limitation. In doing so, the Trust may succeed in avoiding losses but may otherwise fail to achieve its investment objective. Further, the value of short-term fixed-income securities may be affected by changing interest rates and by changes in credit ratings of the investments. If the Trust holds cash uninvested it will be subject to the credit risk of the depository institution holding the cash. |  |  |  |  |  |  |  |  |  |
Risks Associated with Recent Market Events [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Risks Associated with Recent Market Events Although interest rates were unusually low in recent years in the U.S. and abroad, in 2022, the Federal Reserve and certain foreign central banks raised interest rates as part of their efforts to address rising inflation. The Federal Reserve and certain foreign central banks have started to lower interest rates, though economic or other factors, such as inflation, could stop such changes. It is difficult to accurately predict the pace at which interest rates might change, the timing, frequency or magnitude of any such changes in interest rates, or when such changes might stop or again reverse course. Additionally, various economic and political factors could cause the Federal Reserve or other foreign central banks to change their approach in the future and such actions may result in an economic slowdown both in the U.S. and abroad. Unexpected changes in interest rates could lead to significant market volatility or reduce liquidity in certain sectors of the market. Deteriorating economic fundamentals may, in turn, increase the risk of default or insolvency of particular issuers, negatively impact market value, cause credit spreads to widen, and reduce bank balance sheets. Any of these could cause an increase in market volatility, reduce liquidity across various markets or decrease confidence in the markets, which could negatively affect the value of debt instruments held by the Trust and result in a negative impact on the Trust’s performance. See “—Inflation Risk.” Political and diplomatic events within the United States, including a contentious domestic political environment, changes in political party control of one or more branches of the U.S. Government, the U.S. Government’s inability at times to agree on a long-term budget and deficit reduction plan, the threat of a U.S. Government shutdown, and disagreements over, or threats not to increase, the U.S. Government’s borrowing limit (or “debt ceiling”), as well as political and diplomatic events abroad, may affect investor and consumer confidence and may adversely impact financial markets and the broader economy, perhaps suddenly and to a significant degree. A downgrade of the ratings of U.S. Government debt obligations, or concerns about the U.S. Government’s credit quality in general, could have a substantial negative effect on the U.S. and global economies. For example, concerns about the U.S. Government’s credit quality may cause increased volatility in the stock and bond markets, higher interest rates, reduced prices and liquidity of U.S. Treasury securities, and/or increased costs of various kinds of debt. Moreover, although the U.S. Government has honored its credit obligations, there remains a possibility that the United States could default on its obligations. The consequences of such an unprecedented event are impossible to predict, but it is likely that a default by the United States would be highly disruptive to the U.S. and global securities markets and could significantly impair the value of the Trust’s investments. In recent years, some countries, including the United States, have adopted more protectionist trade policies. Slowing global economic growth, the rise in protectionist trade policies, inflationary pressures, changes to some major international trade agreements, risks associated with the trade agreements between countries and regions, including the U.S. and other foreign nations, political or economic dysfunction within some countries or regions, including the U.S., and dramatic changes in commodity and currency prices could affect the economies of many nations in ways that cannot necessarily be foreseen at the present time. In addition, if the U.S. dollar continues to be strong, it may decrease foreign demand for U.S. assets, which could have a negative impact on certain issuers and/or industries. |  |  |  |  |  |  |  |  |  |
EMU and Redenomination Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | EMU and Redenomination Risk Any partial or complete dissolution of the Economic and Monetary Union (the “EMU”) could have significant adverse effects on currency and financial markets, and on the values of the Trust’s portfolio investments. If one or more EMU countries were to stop using the Euro as its primary currency, the Trust’s investments in such countries may be redenominated into a different or newly adopted currency. As a result, the value of those investments could decline significantly and unpredictably. In addition, securities or other investments that are redenominated may be subject to foreign currency risk, liquidity risk and valuation risk to a greater extent than similar investments currently denominated in Euros. To the extent a currency used for redenomination purposes is not specified in respect of certain EMU-related investments, or should the Euro cease to be used entirely, the currency in which such investments are denominated may be unclear, making such investments particularly difficult to value or dispose of. The Trust may incur additional expenses to the extent it is required to seek judicial or other clarification of the denomination or value of such securities. |  |  |  |  |  |  |  |  |  |
Market Disruption and Geopolitical Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Market Disruption and Geopolitical Risk The occurrence of events similar to those in recent years, such as the aftermath of the war in Iraq, instability in Afghanistan, Pakistan, Egypt, Libya, Syria and the Middle East, international war or conflict (including the Israel-Hamas war), new and ongoing epidemics and pandemics of infectious diseases and other global health events, natural/environmental disasters, terrorist attacks in the United States and around the world, social and political discord, debt crises (such as the Greek crisis), sovereign debt downgrades, the Russian invasion of Ukraine, increasingly strained relations between the United States and a number of foreign countries, including historical adversaries, such as North Korea, Iran, China and Russia, and the international community generally, new and continued political unrest in various countries, such as Venezuela and Spain, the exit or potential exit of one or more countries from the EU or the EMU, and continued changes in the balance of political power among and within the branches of the U.S. Government, among others, may result in market volatility, may have long term effects on the U.S. and worldwide financial markets, and may cause further economic uncertainties in the United States and worldwide. Russia launched a large-scale invasion of Ukraine on February 24, 2022. The extent and duration of the military action, resulting sanctions and resulting future market disruptions, including declines in its stock markets and the value of the ruble against the U.S. dollar, in the region are impossible to predict, but could be significant. Any such disruptions caused by Russian military action or other actions (including cyberattacks and espionage) or resulting actual and threatened responses to such activity, including purchasing and financing restrictions, boycotts or changes in consumer or purchaser preferences, sanctions, tariffs or cyberattacks on the Russian government, Russian companies or Russian individuals, including politicians, could have a severe adverse effect on Russia and the European region, including significant negative impacts on the Russian economy, the European economy and the markets for certain securities and commodities, such as oil and natural gas, and may likely have collateral impacts on such sectors globally as well as other sectors. How long such military action and related events will last cannot be predicted. Trade tensions between the United States and China have led to concerns about economic stability and could have an adverse impact on global economic conditions. The United States and China have each been implementing increased tariffs on imports from the other, and the United States has also adopted certain targeted measures such as export controls or sanctions implicating Chinese companies and officials. While certain trade agreements have been agreed between the two countries, there remains much uncertainty as to whether the trade negotiations between the United States and China will be successful and how the trade war between the United States and China will progress. Uncertainty regarding the outcome of the trade tensions and the potential for a trade war could cause the U.S. dollar to decline against safe haven currencies, such as the Japanese yen and the Euro. Events such as these and their consequences are difficult to predict and it is unclear whether further tariffs may be imposed or other escalating actions may be taken in the future. If the trade war between the United States and China continues or escalates, or if additional tariffs or trade restrictions are implemented by the United States, China or other countries in connection with a global trade war, there could be material adverse effects on the global economy, and the Trust and its portfolio investments could be materially and adversely affected. On January 31, 2020, the United Kingdom officially left the European Union (Brexit), subject to a transitional period that ended December 31, 2020. The United Kingdom and European Union have reached an agreement on the terms of their future trading relationship effective January 1, 2021, which principally relates to the trading of goods rather than services, including financial services. Further discussions are to be held between the United Kingdom and the European Union in relation to matters not covered by the trade agreement, such as financial services. The Trust faces risks associated with the potential uncertainty and consequences that may follow Brexit, including with respect to volatility in exchange rates and interest rates. Brexit could adversely affect European or worldwide political, regulatory, economic or market conditions and could contribute to instability in global political institutions, regulatory agencies and financial markets. Brexit has also led to legal uncertainty and could lead to politically divergent national laws and regulations as a new relationship between the United Kingdom and European Union is defined and the United Kingdom determines which European Union laws to replace or replicate. Any of these effects of Brexit could adversely affect any of the companies to which the Trust has exposure and any other assets that the Trust invests in. The political, economic and legal consequences of Brexit are not yet known. In the short term, financial markets may experience heightened volatility, particularly those in the United Kingdom and Europe, but possibly worldwide. The United Kingdom and Europe may be less stable than they have been in recent years, and investments in the United Kingdom and the European Union may be difficult to value or subject to greater or more frequent volatility. In the longer term, there is likely to be a period of significant political, regulatory and commercial uncertainty as the United Kingdom continues to negotiate the terms of its future trading relationship with the European Union. Cybersecurity incidents affecting particular companies or industries may adversely affect the economies of particular countries, regions or parts of the world in which the Trust invests. The occurrence of any of these above events could have a significant adverse impact on the value and risk profile of the Trust’s portfolio. The Trust does not know how long the securities markets may be affected by similar events and cannot predict the effects of similar events in the future on the U.S. economy and securities markets. There can be no assurance that similar events and other market disruptions will not have other material and adverse implications. |  |  |  |  |  |  |  |  |  |
Regulation and Government Intervention Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Regulation and Government Intervention Risk Federal, state, and other governments, their regulatory agencies or self-regulatory organizations may take actions that affect the regulation of the issuers in which the Trust invests in ways that are unforeseeable. Legislation or regulation may also change the way in which the Trust is regulated. Such legislation or regulation could limit or preclude the Trust’s ability to achieve its investment objective. In light of popular, political and judicial focus on finance related consumer protection, financial institution practices are also subject to greater scrutiny and criticism generally. In the case of transactions between financial institutions and the general public, there may be a greater tendency toward strict interpretation of terms and legal rights in favor of the consuming public, particularly where there is a real or perceived disparity in risk allocation and/or where consumers are perceived as not having had an opportunity to exercise informed consent to the transaction. In the event of conflicting interests between retail investors holding common shares of a closed-end investment company such as the Trust and a large financial institution, a court may similarly seek to strictly interpret terms and legal rights in favor of retail investors. The Trust may be affected by governmental action in ways that are not foreseeable, and there is a possibility that such actions could have a significant adverse effect on the Trust and its ability to achieve its investment objective. Investment Company Act Regulations The Trust is a registered closed-end management investment company and as such is subject to regulations under the Investment Company Act. Generally speaking, any contract or provision thereof that is made, or where performance involves a violation of the Investment Company Act or any rule or regulation thereunder is unenforceable by either party unless a court finds otherwise. |  |  |  |  |  |  |  |  |  |
Regulation as a Commodity Pool [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Regulation as a “Commodity Pool” The CFTC subjects advisers to registered investment companies to regulation by the CFTC if a fund that is advised by the investment adviser either (i) invests, directly or indirectly, more than a prescribed level of its liquidation value in CFTC-regulated futures, options and swaps (“CFTC Derivatives”), or (ii) markets itself as providing investment exposure to such instruments. To the extent the Trust uses CFTC Derivatives, it intends to do so below such prescribed levels and will not market itself as a “commodity pool” or a vehicle for trading such instruments. Accordingly, the Advisor has claimed an exclusion from the definition of the term “commodity pool operator” under the Commodity Exchange Act (“CEA”) pursuant to Rule 4.5 under the CEA. The Advisor is not, therefore, subject to registration or regulation as a “commodity pool operator” under the CEA in respect of the Trust. |  |  |  |  |  |  |  |  |  |
Failures of Futures Commission Merchants and Clearing Organizations Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Failures of Futures Commission Merchants and Clearing Organizations Risk The Trust is required to deposit funds to margin open positions in cleared derivative instruments (both futures and swaps) with a clearing broker registered as a “futures commission merchant” (“FCM”). The CEA requires an FCM to segregate all funds received from customers with respect to any orders for the purchase or sale of U.S. domestic futures contracts and cleared swaps from the FCM’s proprietary assets. Similarly, the CEA requires each FCM to hold in a separate secure account all funds received from customers with respect to any orders for the purchase or sale of foreign futures contracts and segregate any such funds from the funds received with respect to domestic futures contracts. However, all funds and other property received by an FCM from its customers are held by an FCM on a commingled basis in an omnibus account and amounts in excess of assets posted to the clearing organization may be invested by an FCM in certain instruments permitted under the applicable regulation. There is a risk that assets deposited by the Trust with any FCM as margin for futures contracts or commodity options may, in certain circumstances, be used to satisfy losses of other clients of the Trust’s FCM. In addition, the assets of the Trust posted as margin against both swaps and futures contracts may not be fully protected in the event of the FCM’s bankruptcy. |  |  |  |  |  |  |  |  |  |
Potential Conflicts of Interest of the Advisor Sub Advisor and Others [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Potential Conflicts of Interest of the Advisor, Sub-Advisor and Others The investment activities of the Advisor, the Sub-Advisor and their affiliates (including BlackRock, Inc. and its subsidiaries (collectively, the “Affiliates”)), and their respective directors, officers or employees, in managing their own accounts and other accounts, may present conflicts of interest that could disadvantage the Trust and its shareholders. The Advisor and its Affiliates may engage in proprietary trading and advise accounts and other funds that have investment objectives similar to those of the Trust and/or that engage in and compete for transactions in the same or similar types of securities, currencies and other assets as are held by the Trust. Subject to the requirements of the Investment Company Act, the Advisor and its Affiliates intend to engage in such activities and may receive compensation from third parties for their services. Neither the Advisor nor any Affiliate is under any obligation to share any investment opportunity, idea or strategy with the Trust. As a result, an Affiliate may compete with the Trust for appropriate investment opportunities. The results of the Trust’s investment activities, therefore, may differ from those of an Affiliate and of other accounts managed by an Affiliate. It is possible that the Trust could sustain losses during periods in which one or more Affiliates and other accounts achieve profits on their trading for proprietary or other accounts. The opposite result is also possible. The Advisor has adopted policies and procedures designed to address potential conflicts of interest. For additional information about potential conflicts of interest and the way in which BlackRock addresses such conflicts, please see “Conflicts of Interest” and “Management of the Trust—Portfolio Management—Potential Material Conflicts of Interest” in the SAI. |  |  |  |  |  |  |  |  |  |
Legal Tax and Regulatory Risks [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Legal, Tax and Regulatory Risks Legal, tax and regulatory changes could occur that may have material adverse effects on the Trust. To qualify for the favorable U.S. federal income tax treatment generally accorded to RICs, the Trust must, among other things, derive in each taxable year at least 90% of its gross income from certain prescribed sources and distribute for each taxable year at least 90% of its “investment company taxable income” (generally, ordinary income plus the excess, if any, of net short-term capital gain over net long-term capital loss). If for any taxable year the Trust does not qualify as a RIC, all of its taxable income for that year (including its net capital gain) would be subject to tax at regular corporate rates without any deduction for distributions to shareholders, and such distributions would be taxable as ordinary dividends to the extent of the Trust’s current and accumulated earnings and profits. The current presidential administration has called for significant changes to U.S. fiscal, tax, trade, healthcare, immigration, foreign, and government regulatory policy. In this regard, there is significant uncertainty with respect to legislation, regulation and government policy at the federal level, as well as the state and local levels. Recent events have created a climate of heightened uncertainty and introduced new and difficult-to-quantify macroeconomic and political risks with potentially far-reaching implications. There has been a corresponding meaningful increase in the uncertainty surrounding interest rates, inflation, foreign exchange rates, trade volumes and fiscal and monetary policy. To the extent the U.S. Congress or the current presidential administration implements changes to U.S. policy, those changes may impact, among other things, the U.S. and global economy, international trade and relations, unemployment, immigration, corporate taxes, healthcare, the U.S. regulatory environment, inflation and other areas. Although the Trust cannot predict the impact, if any, of these changes to the Trust’s business, they could adversely affect the Trust’s business, financial condition, operating results and cash flows. Until the Trust knows what policy changes are made and how those changes impact the Trust’s business and the business of the Trust’s competitors over the long term, the Trust will not know if, overall, the Trust will benefit from them or be negatively affected by them. The rules dealing with U.S. federal income taxation are constantly under review by persons involved in the legislative process and by the Internal Revenue Service and the U.S. Treasury Department. Revisions in U.S. federal tax laws and interpretations of these laws could adversely affect the tax consequences of your investment. |  |  |  |  |  |  |  |  |  |
Decision Making Authority Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Decision-Making Authority Risk Investors have no authority to make decisions or to exercise business discretion on behalf of the Trust, except as set forth in the Trust’s governing documents. The authority for all such decisions is generally delegated to the Board, which in turn, has delegated the day-to-day management of the Trust’s investment activities to the Advisors, subject to oversight by the Board. |  |  |  |  |  |  |  |  |  |
Management Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Management Risk The Trust is subject to management risk because it is an actively managed investment portfolio. The Advisors and the individual portfolio managers will apply investment techniques and risk analyses in making investment decisions for the Trust, but there can be no guarantee that these will produce the desired results. The Trust may be subject to a relatively high level of management risk because the Trust may invest in derivative instruments, which may be highly specialized instruments that require investment techniques and risk analyses different from those associated with equities and bonds. |  |  |  |  |  |  |  |  |  |
Valuation Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Valuation Risk The Trust is subject to valuation risk, which is the risk that one or more of the securities in which the Trust invests are valued at prices that the Trust is unable to obtain upon sale due to factors such as incomplete data, market instability or human error. The Advisor may use an independent pricing service or prices provided by dealers to value securities at their market value. Because the secondary markets for certain investments may be limited, such instruments may be difficult to value. See “Net Asset Value.” When market quotations are not available, the Advisor may price such investments pursuant to a number of methodologies, such as computer-based analytical modeling or individual security evaluations. These methodologies generate approximations of market values, and there may be significant professional disagreement about the best methodology for a particular type of financial instrument or different methodologies that might be used under different circumstances. In the absence of an actual market transaction, reliance on such methodologies is essential, but may introduce significant variances in the ultimate valuation of the Trust’s investments. Technological issues and/or errors by pricing services or other third-party service providers may also impact the Trust’s ability to value its investments and the calculation of the Trust’s NAV. When market quotations are not readily available or are believed by the Advisor to be unreliable, the Advisor will fair value the Trust’s investments in accordance with its policies and procedures. Fair value represents a good faith approximation of the value of an asset or liability. The fair value of an asset or liability held by the Trust is the amount the Trust might reasonably expect to receive from the current sale of that asset or the cost to extinguish that liability in an arm’s-length transaction. Fair value pricing may require determinations that are inherently subjective and inexact about the value of a security or other asset. As a result, there can be no assurance that fair value priced assets will not result in future adjustments to the prices of securities or other assets, or that fair value pricing will reflect a price that the Trust is able to obtain upon sale, and it is possible that the fair value determined for a security or other asset will be materially different from quoted or published prices, from the prices used by others for the same security or other asset and/or from the value that actually could be or is realized upon the sale of that security or other asset. For example, the Trust’s NAV could be adversely affected if the Trust’s determinations regarding the fair value of the Trust’s investments were materially higher than the values that the Trust ultimately realizes upon the disposal of such investments. Where market quotations are not readily available, valuation may require more research than for more liquid investments. In addition, elements of judgment may play a greater role in valuation in such cases than for investments with a more active secondary market because there is less reliable objective data available. Because of overall size, duration and maturities of positions held by the Trust, the value at which its investments can be liquidated may differ, sometimes significantly, from the interim valuations obtained by the Trust. In addition, the timing of liquidations may also affect the values obtained on liquidation. Securities held by the Trust may routinely trade with bid-offer spreads that may be significant. There can be no guarantee that the Trust’s investments could ultimately be realized at the Trust’s valuation of such investments. In addition, the Trust’s compliance with the asset diversification tests applicable to regulated investment companies depends on the fair market values of the Trust’s assets, and, accordingly, a challenge to the valuations ascribed by the Trust could affect its ability to comply with those tests or require it to pay penalty taxes in order to cure a violation thereof. The Trust’s NAV per common share is a critical component in several operational matters including computation of advisory and services fees. Consequently, variance in the valuation of the Trust’s investments will impact, positively or negatively, the fees and expenses shareholders will pay. |  |  |  |  |  |  |  |  |  |
Reliance on the Advisors Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Reliance on the Advisors Risk The Trust is dependent upon services and resources provided by the Advisors, and therefore the Advisors’ parent, BlackRock. The Advisors are not required to devote their full time to the business of the Trust and there is no guarantee or requirement that any investment professional or other employee of the Advisors will allocate a substantial portion of his or her time to the Trust. The loss of one or more individuals involved with the Advisors could have a material adverse effect on the performance or the continued operation of the Trust. For additional information on the Advisors and BlackRock, see “Management of the Trust—Investment Advisor and Sub-Advisor.” |  |  |  |  |  |  |  |  |  |
Reliance on Service Providers Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Reliance on Service Providers Risk The Trust must rely upon the performance of service providers to perform certain functions, which may include functions that are integral to the Trust’s operations and financial performance. Failure by any service provider to carry out its obligations to the Trust in accordance with the terms of its appointment, to exercise due care and skill or to perform its obligations to the Trust at all as a result of insolvency, bankruptcy or other causes could have a material adverse effect on the Trust’s performance and returns to shareholders. The termination of the Trust’s relationship with any service provider, or any delay in appointing a replacement for such service provider, could materially disrupt the business of the Trust and could have a material adverse effect on the Trust’s performance and returns to shareholders. |  |  |  |  |  |  |  |  |  |
Information Technology Systems Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Information Technology Systems Risk The Trust is dependent on the Advisors for certain management services as well as back-office functions. The Advisors depend on information technology systems in order to assess investment opportunities, strategies and markets and to monitor and control risks for the Trust. It is possible that a failure of some kind which causes disruptions to these information technology systems could materially limit the Advisors’ ability to adequately assess and adjust investments, formulate strategies and provide adequate risk control. Any such information technology-related difficulty could harm the performance of the Trust. Further, failure of the back-office functions of the Advisors to process trades in a timely fashion could prejudice the investment performance of the Trust. |  |  |  |  |  |  |  |  |  |
Operational and Technology Risks [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Operational and Technology Risks The Trust and the entities with which it interacts directly or indirectly are susceptible to operational and technology risks, including those related to human errors, processing errors, communication errors, systems failures, cybersecurity incidents, and the use of artificial intelligence and machine learning (“AI”), which may result in losses for the Trust and its shareholders or impair the Trust’s operations. These entities include, but are not limited to, the Trust’s adviser, administrator, distributor, other service providers (e.g., index and benchmark providers, accountants, custodians, and transfer agents), financial intermediaries, counterparties, market makers, authorized participants, listing exchanges, other financial market operators, and governmental authorities. Operational and technology risks for the issuers in which the Trust invests could also result in material adverse consequences for such issuers and may cause the Trust’s investments in such issuers to lose value. The Trust may incur substantial costs in order to mitigate operational and technology risks. Cybersecurity incidents can result from deliberate attacks or unintentional events against an issuer in which the Trust invests, the Trust or any of its service providers. They include, but are not limited to, gaining unauthorized access to systems, misappropriating assets or sensitive information, corrupting or destroying data, and causing operational disruption. Geopolitical tension may increase the scale and sophistication of deliberate attacks, particularly those from nation states or from entities with nation state backing. Cybersecurity incidents may result in any of the following: financial losses; interference with the Trust’s ability to calculate its NAV; disclosure of confidential information; impediments to trading; submission of erroneous trades by the Trust or erroneous subscription or redemption orders; the inability of the Trust or its service providers to transact business; violations of applicable privacy and other laws; regulatory fines; penalties; reputational damage; reimbursement or other compensation costs; and other legal and compliance expenses. Furthermore, cybersecurity incidents may render records of the Trust, including records relating to its assets and transactions, shareholder ownership of Trust shares, and other data integral to the Trust’s functioning, inaccessible, inaccurate or incomplete. Power outages, natural disasters, equipment malfunctions and processing errors that threaten information and technology systems relied upon by the Trust or its service providers, as well as market events that occur at a pace that overloads these systems, may also disrupt business operations or impact critical data. In addition, the risks of increased use of AI technologies, such as machine learning, include data risk, transparency risk, and operational risk. The AI technologies, which are generally highly reliant on the collection and analysis of large amounts of data, may incorporate biased or inaccurate data, and it is not possible or practicable to incorporate all relevant data into such technologies. The output or results of any such AI technologies may therefore be incomplete, erroneous, distorted or misleading. Further, AI tools may lack transparency as to how data is utilized and how outputs are generated. AI technologies may also allow the unintended introduction of vulnerabilities into infrastructures and applications. The Trust and its shareholders could be negatively impacted as a result of these risks associated with AI technologies. AI technologies and their current and potential future applications, and the regulatory frameworks within which they operate, continue to quickly evolve, and it is impossible to anticipate the full scope of future AI capabilities or rules and the associated risks to the Trust. While the Trust’s service providers are required to have appropriate operational, information security and cybersecurity risk management policies and procedures, their methods of risk management may differ from those of the Trust in the setting of priorities, the personnel and resources available or the effectiveness of relevant controls. The Trust and its adviser seek to reduce these risks through controls, procedures and oversight, including establishing business continuity plans and risk management systems. However, there are inherent limitations in such plans and systems, including the possibility that certain risks that may affect the Trust have not been identified or may emerge in the future; that such plans and systems may not completely eliminate the occurrence or mitigate the effects of operational or information security disruptions or failures or of cybersecurity incidents; or that prevention and remediation efforts will not be successful or that incidents will go undetected. The Trust cannot control the systems, information security or other cybersecurity of the issuers in which it invests or its service providers, counterparties, and other third parties whose activities affect the Trust. Lastly, the regulatory climate governing cybersecurity and data protection is developing quickly and may vary considerably across jurisdictions. Regulators continue to develop new rules and standards related to cybersecurity and data protection. Compliance with evolving regulations can be demanding and costly, requiring substantial resources to monitor and implement required changes. |  |  |  |  |  |  |  |  |  |
Misconduct of Employees and of Service Providers Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Misconduct of Employees and of Service Providers Risk Misconduct or misrepresentations by employees of the Advisors or the Trust’s service providers could cause significant losses to the Trust. Employee misconduct may include binding the Trust to transactions that exceed authorized limits or present unacceptable risks and unauthorized trading activities, concealing unsuccessful trading activities (which, in any case, may result in unknown and unmanaged risks or losses) or making misrepresentations regarding any of the foregoing. Losses could also result from actions by the Trust’s service providers, including, without limitation, failing to recognize trades and misappropriating assets. In addition, employees and service providers may improperly use or disclose confidential information, which could result in litigation or serious financial harm, including limiting the Trust’s business prospects or future marketing activities. Despite the Advisors’ due diligence efforts, misconduct and intentional misrepresentations may be undetected or not fully comprehended, thereby potentially undermining the Advisors’ due diligence efforts. As a result, no assurances can be given that the due diligence performed by the Advisors will identify or prevent any such misconduct. |  |  |  |  |  |  |  |  |  |
Portfolio Turnover Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Portfolio Turnover Risk The Trust’s annual portfolio turnover rate may vary greatly from year to year, as well as within a given year. Portfolio turnover rate is not considered a limiting factor in the execution of investment decisions for the Trust. A higher portfolio turnover rate results in correspondingly greater brokerage commissions and other transactional expenses that are borne by the Trust. High portfolio turnover may result in an increased realization of net short-term capital gains by the Trust which, when distributed to common shareholders, will be taxable as ordinary income. Additionally, in a declining market, portfolio turnover may create realized capital losses. |  |  |  |  |  |  |  |  |  |
Not a Complete Investment Program [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Not a Complete Investment Program The Trust is intended for investors seeking a high level of total return, through a combination of current income, current gains and long-term capital appreciation. The Trust is not meant to provide a vehicle for those who wish to exploit short-term swings in the stock market and is intended for long-term investors. An investment in shares of the Trust should not be considered a complete investment program. Each shareholder should take into account the Trust’s investment objective as well as the shareholder’s other investments when considering an investment in the Trust. |  |  |  |  |  |  |  |  |  |
Anti Takeover Provisions Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | Anti-Takeover Provisions Risk The Trust’s Agreement and Declaration of Trust and Bylaws include provisions that could limit the ability of other entities or persons to acquire control of the Trust or convert the Trust to open-end status or to change the composition of the Board. 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 Trust. See “Certain Provisions in the Agreement and Declaration of Trust and Bylaws.” |  |  |  |  |  |  |  |  |  |
General Risks [Member] |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  | General Risks Please refer to the section of the Trust’s most recent annual report on Form N-CSR entitled “Investment Objectives, Policies and Risks—Risk Factors”, which is incorporated by reference herein, for a discussion of the general risks of investing in the Trust. |  |  |  |  |  |  |  |  |  |
Business Contact [Member] |  |  |  |  |  |  |  |  |  |  |  |
Cover [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Entity Address, Address Line One |  | 50 Hudson Yards |  |  |  |  |  |  |  |  |  |
Entity Address, City or Town |  | New York |  |  |  |  |  |  |  |  |  |
Entity Address, State or Province |  | NY |  |  |  |  |  |  |  |  |  |
Entity Address, Postal Zip Code |  | 10001 |  |  |  |  |  |  |  |  |  |
Contact Personnel Name |  | John M. Perlowski, President |  |  |  |  |  |  |  |  |  |
Common Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |
Other Annual Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Basis of Transaction Fees, Note [Text Block] |  | as a percentage of net assets attributable to common shares |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Lowest Price or Bid |  |  |  | $ 22.20 | $ 22.12 | $ 22.14 | $ 20.20 | $ 20.57 | $ 18.75 | $ 19.64 | $ 21.56 | $ 20.99
Highest Price or Bid |  |  |  | 23.74 | 24.27 | 24.83 | 23.03 | 22.24 | 21.82 | 23.34 | 23.98 | 23.98
Lowest Price or Bid, NAV |  |  |  | 22.28 | 22.44 | 22.30 | 21.24 | 21.47 | 19.79 | 20.42 | 22.18 | 22.33
Highest Price or Bid, NAV |  |  |  | $ 23.92 | $ 24.41 | $ 24.43 | $ 22.97 | $ 22.28 | $ 22.54 | $ 23.35 | $ 22.97 | $ 22.97
Highest Price or Bid, Premium (Discount) to NAV [Percent] |  |  |  | (0.75%) | (0.16%) | 1.64% | 0.26% | (0.18%) | (3.19%) | (0.04%) | 4.40% | 4.40%
Lowest Price or Bid, Premium (Discount) to NAV [Percent] |  |  |  | (0.38%) | (1.43%) | (0.72%) | (4.90%) | (4.19%) | (5.26%) | (3.82%) | (2.80%) | (6.00%)
Share Price |  |  | $ 24.37 |  |  |  |  |  |  |  |  |
NAV Per Share |  |  | $ 24.10 |  |  |  |  |  |  |  |  |
Latest Premium (Discount) to NAV [Percent] |  |  | 1.10% |  |  |  |  |  |  |  |  |
Capital Stock, Long-Term Debt, and Other Securities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Security Title [Text Block] |  | Common Shares |  |  |  |  |  |  |  |  |  |
Outstanding Security, Title [Text Block] |  |  | Common Shares |  |  |  |  |  |  |  |  |
Outstanding Security, Held [Shares] |  |  | 0 |  |  |  |  |  |  |  |  |
Outstanding Security, Not Held [Shares] |  |  | 22,706,449 |  |  |  |  |  |  |  |  |
Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock, Long-Term Debt, and Other Securities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Security Title [Text Block] |  | Preferred Shares |  |  |  |  |  |  |  |  |  |
[1] | If the common shares are sold to or through underwriters, the Prospectus Supplement will set forth any applicable sales load and the estimated offering expenses. Trust shareholders will pay all offering expenses involved with an offering.
[2] | The Reinvestment Plan Agent’s (as defined below under “Dividend Reinvestment Plan”) fees for the handling of the reinvestment of dividends will be paid by the Trust. However, you will pay a $0.02 per share fee incurred in connection with open-market purchases, which will be deducted from the value of the dividend. You will also be charged a $2.50 sales fee and pay a $0.15 per share fee if you direct the Reinvestment Plan Agent to sell your common shares held in a dividend reinvestment account. Per share fees include any applicable brokerage commissions the Reinvestment Plan Agent is required to pay.
[3] | The Advisor receives an annual fee, payable monthly, in a maximum amount equal to 1.00% of the average daily value of the net assets of the Trust.
[4] | The Trust and the Advisor have entered into a fee waiver agreement (the “Fee Waiver Agreement”), pursuant to which the Advisor has contractually agreed to waive the management fee with respect to any portion of the Trust’s assets attributable to investments in any equity and fixed-income mutual funds and exchange-traded funds (“ETFs”) managed by the Advisor or its affiliates and other exchange-traded products sponsored by the Advisor or its affiliates, in each case that have a contractual management fee, through June 30, 2027. In addition, pursuant to the Fee Waiver Agreement, the Advisor has contractually agreed to waive its management fees by the amount of investment advisory fees the Trust pays to the Advisor indirectly through its investment in money market funds managed by the Advisor or its affiliates, through June 30, 2027. The Fee Waiver Agreement may be terminated at any time, without the payment of any penalty, only by the Trust (upon the vote of a majority of the Trustees who are not “interested persons” (as defined in the Investment Company Act) of the Trust (the “Independent Trustees”) or a majority of the outstanding voting securities of the Trust), upon 90 days’ written notice by the Trust to the Advisor.
[5] | “Other Expenses” are based on estimated amounts for the current fiscal year.

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