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Borrowings
 12 Months Ended
Dec. 31, 2022
Debt Disclosure [Abstract]  
Borrowings Borrowings
On June 8, 2018 the Company's shareholders approved the application of the modified asset coverage requirements set forth in Section 61(a) of the 1940 Act, which resulted in the reduction from 200.0% to 150.0% of the minimum asset coverage ratio applicable to the Company as of June 9, 2018 (which means the Company can borrow $2 for every $1 of its equity). As a result of the Company's exemptive relief received on November 5, 2014, the Company is permitted to exclude its SBA-guaranteed debentures from the 150.0% asset coverage ratio that the Company is required to maintain under the 1940 Act. The agreements governing the NMFC Credit Facility, the Convertible Notes (as defined below) and the Unsecured Notes (as defined below) contain certain covenants and terms, including a requirement that the Company not exceed a debt-to-equity ratio of 1.65 to 1.00 at the time of incurring additional indebtedness and a requirement that the Company not exceed a secured debt ratio of 0.70 to 1.00 at any time. As of December 31, 2022, the Company’s asset coverage ratio was 177.42%.
Holdings Credit Facility—On October 24, 2017, the Company entered into the Third Amended and Restated Loan and Security Agreement among the Company, as the Collateral Manager, NMF Holdings, as the Borrower, Wells Fargo Securities, LLC, as the Administrative Agent and Wells Fargo Bank, National Association, as the Lender and Collateral Custodian (as amended from time to time, the "Holdings Credit Facility"). As of the most recent amendment on April 20, 2021, the maturity date of the Holdings Credit Facility is April 20, 2026, and the maximum facility amount is the lesser of $800,000 and the actual commitments of the lenders to make advances as of such date.
As of December 31, 2022, the maximum amount of revolving borrowings available under the Holdings Credit Facility is $730,000. Under the Holdings Credit Facility, NMF Holdings is permitted to borrow up to 25.0%, 45.0%, 67.5% or 70.0% of the purchase price of pledged assets, subject to approval by Wells Fargo Bank, National Association. The Holdings Credit Facility is non-recourse to the Company and is collateralized by all of the investments of NMF Holdings on an investment by investment basis. All fees associated with the origination, amending or upsizing of the Holdings Credit Facility are capitalized on the Company's Consolidated Statement of Assets and Liabilities and charged against income as other financing expenses over the life of the Holdings Credit Facility. The Holdings Credit Facility contains certain customary affirmative and negative covenants and events of default. In addition, the Holdings Credit Facility requires the Company to maintain a minimum asset coverage ratio of 150.0%. The covenants are generally not tied to mark to market fluctuations in the prices of NMF Holdings investments, but rather to the performance of the underlying portfolio companies.
As of the most recent amendment on April 20, 2021, the Holdings Credit Facility bears interest at a rate of LIBOR plus 1.60% per annum for Broadly Syndicated Loans (as defined in the Fifth Amendment to the Loan and Security Agreement) and LIBOR plus 2.10% per annum for all other investments. From September 30, 2020 to April 19, 2021 the Holdings Credit Facility bore interest at a rate of LIBOR plus 2.00% per annum for Broadly Syndicated Loans (as defined in the Fourth Amendment Loan and Security Agreement) and LIBOR plus 2.50% per annum for all other investments. Prior to September 30, 2020, the Holdings Credit Facility bore interest at a rate of LIBOR plus 1.75% per annum for Broadly Syndicated Loans (as defined in the Second Amendment to the Loan and Security Agreement) and LIBOR plus 2.25% per annum for all other investments. The Holdings Credit Facility also charges a non-usage fee, based on the unused facility amount multiplied by the Non-Usage Fee Rate (as defined in the Third Amended and Restated Loan and Security Agreement).    
The following table summarizes the interest expense, non-usage fees and amortization of financing costs incurred on the Holdings Credit Facility for the years ended December 31, 2022, December 31, 2021 and December 31, 2020.
 Year Ended December 31,
 202220212020
Interest expense$22,542 $10,210 $14,164 
Non-usage fee$743 $1,282 $1,304 
Amortization of financing costs$2,956 $2,852 $1,507 
Weighted average interest rate3.9 %2.1 %2.7 %
Effective interest rate4.5 %3.0 %3.2 %
Average debt outstanding$581,367 $478,016 $526,645 
As of December 31, 2022, December 31, 2021 and December 31, 2020, the outstanding balance on the Holdings Credit Facility was $618,963, $545,263 and $450,163, respectively, and NMF Holdings was in compliance with the applicable covenants in the Holdings Credit Facility on such dates.
NMFC Credit Facility—The Amended and Restated Senior Secured Revolving Credit Agreement, (as amended from time to time, and together with the related guarantee and security agreement, the "RCA"), dated June 4, 2021, among the Company, as the Borrower, Goldman Sachs Bank USA, as the Administrative Agent and Collateral Agent, and Goldman Sachs Bank USA, Morgan Stanley Bank, N.A., Stifel Bank & Trust and MUFG Union Bank, N.A., as Lenders (the "NMFC Credit Facility"), is structured as a senior secured revolving credit facility. The NMFC Credit Facility is guaranteed by certain of the Company's domestic subsidiaries and proceeds from the NMFC Credit Facility may be used for general corporate purposes, including the funding of portfolio investments. As of the most recent amendment on June 4, 2021, the maturity date of the NMFC Credit Facility is June 4, 2026.
As of December 31, 2022, the maximum amount of revolving borrowings available under the NMFC Credit Facility was $198,500. The Company is permitted to borrow at various advance rates depending on the type of portfolio investment, as outlined in the RCA. All fees associated with the origination and amending of the NMFC Credit Facility are capitalized on the Company's Consolidated Statement of Assets and Liabilities and charged against income as other financing expenses over the life of the NMFC Credit Facility. The NMFC Credit Facility contains certain customary affirmative and negative covenants and events of default, including certain financial covenants related to asset coverage and liquidity and other maintenance covenants.
As of the most recent amendment on June 4, 2021, the NMFC Credit Facility generally bears interest at a rate of LIBOR, Sterling Overnight Interbank Average Rate ("SONIA") or Euro Interbank Offered Rate ("EURIBOR") plus 2.10% per annum or the prime rate plus 1.10% per annum, and charges a commitment fee, based on the unused facility amount multiplied by 0.375% per annum (as defined in the RCA). Prior to June 4, 2021, the NMFC Credit Facility bore interest at a rate of LIBOR plus 2.50% per annum or the prime rate plus 1.50% per annum, and charged a commitment fee, based on the unused facility amount multiplied by 0.375% per annum (as defined in the RCA).
The following table summarizes the interest expense, non-usage fees and amortization of financing costs incurred on the NMFC Credit Facility for the years ended December 31, 2022, December 31, 2021 and December 31, 2020.
 Year Ended December 31,
 202220212020
Interest expense$4,608 $3,171 $5,023 
Non-usage fee$247 $213 $126 
Amortization of financing costs$229 $199 $137 
Weighted average interest rate3.5 %2.4 %3.2 %
Effective interest rate3.8 %2.7 %3.4 %
Average debt outstanding$133,053 $132,685 $155,497 
As of December 31, 2022, the outstanding balance on the NMFC Credit Facility was $40,359, which included £22,850 denominated in British Pound Sterling ("GBP") and €700 denominated in Euro ("EUR") that has been converted to U.S. dollars. As of December 31, 2021, the outstanding balance on the NMFC Credit Facility was $127,192, which included £16,400 denominated in GBP that has been converted to U.S. dollars. As of December 31, 2020, the outstanding balance on the NMFC Credit Facility was $165,500. NMFC was in compliance with the applicable covenants in the NMFC Credit Facility on such dates.
Unsecured Management Company Revolver—The Uncommitted Revolving Loan Agreement, dated March 30, 2020, by and between the Company, as the Borrower, and NMF Investments III, L.L.C., as Lender, an affiliate of the Investment Adviser (the "Unsecured Management Company Revolver"), is structured as a discretionary unsecured revolving credit facility. The proceeds from the Unsecured Management Company Revolver may be used for general corporate purposes, including the funding of portfolio investments. As of the most recent amendment on December 17, 2021, the maturity date of the Unsecured Management Company Revolver is December 31, 2024.
As of the most recent amendment on December 17, 2021, the Unsecured Management Company Revolver bears interest at a rate of 4.00% per annum. Prior to December 17, 2021, the Unsecured Management Company Revolver bore interest at a rate of 7.00% per annum (as defined in the Uncommitted Revolving Loan Agreement). On May 4, 2020, the Company entered into an Amended and Restated Uncommitted Revolving Loan Agreement with NMF Investments III, L.L.C., which increased the maximum amounts of revolving borrowings available thereunder from $30,000 to $50,000. As of December 31, 2022, the maximum amount of revolving borrowings available under the Unsecured Management Company Revolver was $50,000 and no borrowings were outstanding. For the year ended December 31, 2022, and December 31, 2021, amortization of financing costs were $14 and $11, respectively.
DB Credit Facility—The Loan Financing and Servicing Agreement (the "LFSA") dated December 14, 2018 and as amended from time to time, among NMFDB as the borrower, Deutsche Bank AG, New York Branch ("Deutsche Bank") as the facility agent, Lender and other agent from time to time party thereto and U.S. Bank National Association, as collateral agent and collateral custodian (the "DB Credit Facility"), is structured as a secured revolving credit facility and the maturity date is March 25, 2026.
As of December 31, 2022, the maximum amount of revolving borrowings available under the DB Credit Facility was $280,000. The Company is permitted to borrow at various advance rates depending on the type of portfolio investment, as outlined in the LFSA. The DB Credit Facility is non-recourse to the Company and is collateralized by all of the investments of NMFDB on an investment by investment basis. All fees associated with the origination and amending of the DB Credit Facility are capitalized on the Company's Consolidated Statement of Assets and Liabilities and charged against income as other financing expenses over the life of the DB Credit Facility. The DB Credit Facility contains certain customary affirmative and negative covenants and events of default. The covenants are generally not tied to mark to market fluctuations in the prices of NMFDB investments, but rather to the performance of the underlying portfolio companies.
The advances under the DB Credit Facility accrue interest at a per annum rate equal to the Applicable Margin plus the lender's Cost of Funds Rate. Prior to March 25, 2021, the Applicable Margin was equal to 2.60% during the Revolving Period and then increases by 0.20% during an Event of Default. Effective March 25, 2021, the Applicable Margin is equal to 2.35% during the Revolving Period and then increases by 0.20% during an Event of Default. The "Cost of Funds Rate" for a conduit lender is the lower of its commercial paper rate and the Base Rate plus 0.50%, and for any other lender is the Base Rate. The "Base Rate" is the three-months LIBOR Rate but may become an alternative base rate based on Deutsche Bank's base lending rate if certain LIBOR disruption events occur. The Company is also charged a non-usage fee, based on the unused facility amount multiplied by the Undrawn Fee Rate (as defined in the LFSA) and a facility agent fee of 0.25% per annum on the total facility amount.
The following table summarizes the interest expense, non-usage fees and amortization of financing costs incurred on the DB Credit Facility for the years ended December 31, 2022, December 31, 2021 and December 31, 2020.
 Year Ended December 31,
 20222021 2020
Interest expense(1)$9,816 $5,985 $8,499 
Non-usage fee(1)$355 $362 $236 
Amortization of financing costs$1,082 $981 $641 
Weighted average interest rate4.7 %2.9 %3.6 %
Effective interest rate5.4 %3.5 %4.0 %
Average debt outstanding$209,898 $209,307 $233,649 
(1)Interest expense includes the portion of the facility agent fee applicable to the drawn portion of the DB Credit Facility and non-usage fee includes the portion of the facility agent fee applicable to the undrawn portion of the DB Credit Facility.
As of December 31, 2022, December 31, 2021 and December 31, 2020 the outstanding balance on the DB Credit Facility was $186,400, $226,300 and $244,000, respectively, and NMFDB was in compliance with the applicable covenants in the DB Credit Facility on such dates.
NMNLC Credit Facilities— The Revolving Credit Agreement (together with the related guarantee and security agreement, the “NMNLC Credit Facility”), dated September 21, 2018, by and between NMNLC, as the Borrower, and KeyBank National Association, as the Administrative Agent and Lender (the "NMNLC Revolving Credit Agreement"), was structured as a senior secured revolving credit facility and matured on September 23, 2020. The NMNLC Credit Facility was guaranteed by the Company and proceeds from the NMNLC Credit Facility were able to be used for funding of additional
acquisition properties.
The NMNLC Credit Facility bore interest at a rate of LIBOR plus 2.50% per annum or the prime rate plus 1.50% per annum, and charged a commitment fee, based on the unused facility amount multiplied by 0.15% per annum (as defined in the NMNLC Revolving Credit Agreement). For the year ended December 31, 2020, interest expense, non-usage fees and amortization of financing costs were $0, $33 and $11, respectively.
The Credit Agreement (together with the related guarantee and security agreement, the "NMNLC CA"), dated February 26, 2021, by and between NMNLC, as the Borrower, and City National Bank, as the Lender (the "NMNLC Credit Facility II"), is structured as a senior secured revolving credit facility. As of the most recent amendment on November 1, 2022, NM CLFX LP has been added as a co-borrower and the NMNLC CA will mature on November 1, 2024. The NMNLC Credit Facility II is guaranteed by the Company and proceeds from the NMNLC Credit Facility II are able to be used for refinancing existing loans on properties held.
Prior to the amendment on December 7, 2021, the NMNLC Credit Facility II bore interest at a rate of LIBOR plus 2.75% per annum, and charged a commitment fee, based on the unused facility amount multiplied by 0.05% per annum (as defined in the NMNLC CA). From December 7, 2021 through November 1, 2022, the NMNLC Credit Facility II bore interest at a rate of the Secured Overnight Financing Rate ("SOFR") plus 2.75% per annum with a 0.35% floor, and charges a commitment fee, based on the unused facility amount multiplied by 0.05% per annum (as defined in the NMNLC CA). As of the amendment on November 1, 2022, the NMNLC Credit Facility II bears interest at a rate of SOFR plus 2.25%.
Prior to the amendment on March 16, 2022, the maximum amount of revolving borrowings available under the NMNLC Credit Facility II was $20,000. As of the March 16, 2022 amendment and effective May 1, 2022 through November 1, 2022, the maximum amount of revolving borrowings available under the NMNLC Credit Facility II was $10,000. As of the amendment on November 1, 2022, the maximum amount of revolving borrowings available to all borrowers under the NMNLC Credit Facility II is $27,500, of which $26,339 is outstanding as of December 31, 2022.
The following table summarizes the interest expense, non-usage fees and amortization of financing costs incurred on the NMNLC Credit Facillity II for the years ended December 31, 2022 and December 31, 2021.
 Year Ended December 31,
 20222021
Interest expense$252 $93 
Non-usage fee$3 $3 
Amortization of financing costs$58 $83 
Weighted average interest rate3.5 %2.7 %
Effective interest rate4.4 %5.1 %
Average debt outstanding$7,195 $3,501 
As of December 31, 2022 and December 31, 2021, the outstanding balance on the NMNLC Credit Facility II was $3,785 and $15,200, respectively, and NMNLC was in compliance with the applicable covenants in the NMNLC Credit Facility II on such date.
Convertible Notes
2018 Convertible Notes—On August 20, 2018, the Company closed a registered public offering of $100,000 aggregate principal amount of unsecured convertible notes (the “2018 Convertible Notes”), pursuant to an indenture, dated August 20, 2018, as supplemented by a first supplemental indenture thereto, dated August 20, 2018 (together the “2018A Indenture”). On August 30, 2018, in connection with the registered public offering, the Company issued an additional $15,000 aggregate principal amount of the 2018 Convertible Notes pursuant to the exercise of an overallotment option by the underwriter of the 2018 Convertible Notes. On June 7, 2019, the Company closed a registered public offering of an additional $86,250 aggregate
principal amount of the 2018 Convertible Notes. These additional 2018 Convertible Notes constitute a further issuance of, rank equally in right of payment with, and form a single series with the $115,000 aggregate principal amount of 2018 Convertible Notes that the Company issued in August 2018.
The 2018 Convertible Notes bear interest at an annual rate of 5.75%, payable semi-annually in arrears on February 15 and August 15 of each year, which commenced on February 15, 2019. The 2018 Convertible Notes will mature on August 15, 2023 unless earlier converted, repurchased or redeemed pursuant to the terms of the 2018A Indenture. The Company may not redeem the 2018 Convertible Notes prior to May 15, 2023. On or after May 15, 2023, the Company may redeem the 2018 Convertible Notes for cash, in whole or from time to time in part, at its option at a redemption price, subject to an exception for redemption dates occurring after a record date but on or prior to the interest payment date, equal to the sum of (i) 100% of the principal amount of the 2018 Convertible Notes to be redeemed, (ii) accrued and unpaid interest thereon to, but excluding, the redemption date and (iii) a make-whole premium.
On November 4, 2022, the Company launched a tender offer to purchase, upon the terms and subject to the conditions set forth in the Offer to Purchase, dated November 4, 2022, up to $201,250 aggregate principal amount of outstanding 2018 Convertible Notes for cash in an amount equal to $1,000 per $1,000 principal amount of Notes purchased (exclusive of accrued and unpaid interest on such notes) (the "Tender Offer"). The Tender Offer expired on December 6, 2022. As of the expiration of the Tender Offer, $84,434 aggregate principal amount of the 2018 Convertible Notes were validly tendered and not validly withdrawn pursuant to the Tender Offer. The Company accepted for purchase all of the 2018 Convertible Notes that were validly tendered and not validly withdrawn at the expiration of the Tender Offer. Following settlement of the Tender Offer on December 9, 2022, approximately $116,816 aggregate principal amount of the 2018 Convertible Notes remained outstanding.
No sinking fund is provided for the 2018 Convertible Notes. Holders of 2018 Convertible Notes may, at their option, convert their 2018 Convertible Notes into shares of the Company’s common stock at any time on or prior to the close of business on the business day immediately preceding the maturity date of the 2018 Convertible Notes. In addition, if certain corporate events occur, holders of the 2018 Convertible Notes may require the Company to repurchase for cash all or part of their 2018 Convertible Notes at a repurchase price equal to 100.0% of the principal amount of the 2018 Convertible Notes to be repurchased, plus accrued and unpaid interest through, but excluding, the repurchase date.
The 2018A Indenture contains certain covenants, including covenants requiring the Company to provide certain financial information to the holders of the 2018 Convertible Notes and the trustee if the Company ceases to be subject to the reporting requirements of the Exchange Act. The 2018A Indenture also includes additional financial covenants related to asset coverage. These covenants are subject to limitations and exceptions that are described in the 2018A Indenture.
2022 Convertible Notes—On November 2, 2022, the Company closed a registered public offering of $200,000 aggregate principal amount of unsecured convertible notes (the “2022 Convertible Notes”), pursuant to an indenture, dated August 20, 2018, as supplemented by a third supplemental indenture thereto, dated November 2, 2022 (together the “2018C Indenture”).
The 2022 Convertible Notes bear interest at an annual rate of 7.50%, payable semi-annually in arrears on April 15 and October 15 of each year, commencing on April 15, 2023. The 2022 Convertible Notes will mature on October 15, 2025 unless earlier converted, repurchased or redeemed pursuant to the terms of the 2018C Indenture. The Company may not redeem the 2022 Convertible Notes prior to July 15, 2025. On or after July 15, 2025, the Company may redeem the 2022 Convertible Notes for cash, in whole or from time to time in part, at our option at a redemption price, subject to an exception for redemption dates occurring after a record date but on or prior to the interest payment date, equal to the sum of (i) 100% of the principal amount of the 2022 Convertible Notes to be redeemed, (ii) accrued and unpaid interest thereon to, but excluding, the redemption date and (iii) a make-whole premium.
The following table summarizes certain key terms related to the convertible features of the Company’s 2018 Convertible Notes and the 2022 Convertible Notes (the "Convertible Notes") as of December 31, 2022.
 2018 Convertible Notes2022 Convertible Notes
Initial conversion premium10.0 %N/A
Initial conversion rate(1)65.8762 70.4225 
Initial conversion price$15.18 $14.20 
Conversion premium at December 31, 202210.0 %N/A
Conversion rate at December 31, 2022(1)(2)65.8762 70.5365 
Conversion price at December 31, 2022(2)(3)$15.18 $14.18 
Last conversion price calculation dateAugust 20, 2022December 16, 2022
(1)Conversion rates denominated in shares of common stock per $1 principal amount of the Convertible Notes converted.
(2)Represents conversion rate and conversion price, as applicable, taking into account certain de minimis adjustments that will be made on the conversion date.
(3)The conversion price in effect at December 31, 2022 on the 2018 Convertible Notes was calculated on the last anniversary of the issuance and will be calculated again on the next anniversary, unless the exercise price shall have changed by more than 1.0% before the anniversary. The conversion price in effect at December 31, 2022 on the 2022 Convertible Notes was calculated on December 16, 2022.
The conversion rate will be subject to adjustment upon certain events, such as stock splits and combinations, mergers, spin-offs, increases in dividends in excess of $0.34 per share per quarter for the 2018 Convertible Notes and $0.30 per share per quarter for the 2022 Convertible Notes and certain changes in control. Certain of these adjustments, including adjustments for increases in dividends, are subject to a conversion price floor of $13.80 per share for the 2018 Convertible Notes and $12.38 per share for the 2022 Convertible Notes. In no event will the total number of shares of common stock issuable upon conversion exceed 72.4637 per $1 principal amount of the 2018 Convertible Notes and 80.7754 per $1 principal amount of the 2022 Convertible Notes. The Company has determined that the embedded conversion option in the Convertible Notes is not required to be separately accounted for as a derivative under GAAP.
The Convertible Notes are unsecured obligations and rank senior in right of payment to the Company’s existing and future indebtedness, if any, that is expressly subordinated in right of payment to the Convertible Notes; equal in right of payment to the Company’s existing and future unsecured indebtedness that is not so subordinated; effectively junior in right of payment to any of the Company’s secured indebtedness (including existing unsecured indebtedness that the Company later secures) to the extent of the value of the assets securing such indebtedness; and structurally junior to all existing and future indebtedness (including trade payables) incurred by the Company’s subsidiaries and financing vehicles. As reflected in Note 12. Earnings Per Share, the issuance is considered part of the if-converted method for calculation of diluted earnings per share.
The following table summarizes the interest expense, amortization of financing costs and amortization of premium incurred on the Convertible Notes for the years ended December 31, 2022, December 31, 2021 and December 31, 2020.
 Year Ended December 31,
 2022(1)20212020
Interest expense$13,734 $11,572 $11,572 
Amortization of financing costs$694 $395 $396 
Amortization of premium$(130)$(103)$(103)
Weighted average interest rate6.0 %5.8 %5.8 %
Effective interest rate6.2 %5.9 %5.9 %
Average debt outstanding$228,806 $201,250 $201,250 
(1)For the year ended December 31, 2022, amounts reported include interest and amortization of financing costs related to the 2022 Convertible Notes for the period from November 2, 2022 (issuance of the 2022 Convertible Notes) to December 31, 2022.

As of December 31, 2022, December 31, 2021 and December 31, 2020, the outstanding balance on the Convertible Notes was $316,816, $201,250 and $201,250, respectively, and NMFC was in compliance with the terms of the 2018A Indenture and 2018C Indenture on such date.
Unsecured Notes
On May 6, 2016, the Company issued $50,000 in aggregate principal amount of five-year unsecured notes (the “2016 Unsecured Notes”), pursuant to a note purchase agreement, dated May 4, 2016, to an institutional investor in a private placement. On September 30, 2016, the Company entered into an amended and restated note purchase agreement (the "NPA") and issued an additional $40,000 in aggregate principal amount of 2016 Unsecured Notes to institutional investors in a private placement. On February 16, 2021, the Company repaid all $90,000 in aggregate principal amount of the issued and outstanding 2016 Unsecured Notes. On June 30, 2017, the Company issued $55,000 in aggregate principal amount of five-year unsecured notes that matured on July 15, 2022 (the "2017A Unsecured Notes"), pursuant to the NPA and a supplement to the NPA. On July 15, 2022, the Company caused notices to be issued to holders of the Company's 2017A Unsecured Notes regarding the exercise of the Company's option to repay all of the Company's $55,000 in aggregate principal amount of issued and outstanding 2017A Unsecured Notes, which was repaid on July 14, 2022. On January 30, 2018, the Company issued $90,000 in aggregate principal amount of five year unsecured notes that matured on January 30, 2023 (the "2018A Unsecured Notes") pursuant to the NPA and a second supplement to the NPA. On July 5, 2018, the Company issued $50,000 in aggregate principal amount of five year unsecured notes that mature on June 28, 2023 (the "2018B Unsecured Notes") pursuant to the NPA and a third supplement to the NPA (the "Third Supplement"). On April 30, 2019, the Company issued $116,500 in aggregate principal amount of five year unsecured notes that mature on April 30, 2024 (the "2019A Unsecured Notes") pursuant to the NPA and a fourth supplement to the NPA (the "Fourth Supplement"). On January 29, 2021, the Company issued $200,000 in aggregate principal amount of five year unsecured notes that mature on January 29, 2026 (the "2021A Unsecured Notes") pursuant to the NPA and a fifth supplement to the NPA (the "Fifth Supplement"). On June 15, 2022, the Company issued $75,000 in aggregate principal amount of five year unsecured notes that mature on June 15, 2027 (the "2022A Unsecured Notes") pursuant to the NPA and a sixth supplement to the NPA (the "Sixth Supplement"). The NPA provides for future issuances of unsecured notes in separate series or tranches.
The 2016 Unsecured Notes bore interest at an annual rate of 5.313%, payable semi-annually on May 15 and November 15 of each year. The 2017A Unsecured Notes bore interest at an annual rate of 4.760%, payable semi-annually on January 15 and July 15 of each year. The 2018A Unsecured Notes bear interest at an annual rate of 4.870%, payable semi-annually on February 15 and August 15 of each year. The 2018B Unsecured Notes bear interest at an annual rate of 5.360%, payable semi-annually on January 15 and July 15 of each year. The 2019A Unsecured Notes bear interest at an annual rate of 5.494%, payable semi-annually on April 15 and October 15 of each year. The 2021A Unsecured Notes bear interest at an annual rate of 3.875%, payable semi-annually in arrears on January 29 and July 29 of each year, which commenced on July 29, 2021. The 2022A Unsecured Notes bear interest at an annual rate of 5.900% payable semi-annually in arrears on June 15 and December 15 of each year, which commenced on December 14, 2022. These interest rates are subject to increase in the event that: (i) subject to certain exceptions, the underlying unsecured notes or the Company ceases to have an investment grade rating or (ii) the aggregate amount of the Company’s unsecured debt falls below $150,000.  In each such event, the Company has the option to offer to prepay the underlying unsecured notes at par, in which case holders of the underlying unsecured notes who accept the offer would not receive the increased interest rate. In addition, the Company is obligated to offer to prepay the underlying unsecured notes at par if the Investment Adviser, or an affiliate thereof, ceases to be the Company’s investment adviser or if certain change in control events occur with respect to the Investment Adviser. 
The NPA contains customary terms and conditions for unsecured notes issued in a private placement, including, without limitation, an option to offer to prepay all or a portion of the unsecured notes under its governance at par (plus a make-whole amount, if applicable), affirmative and negative covenants such as information reporting, maintenance of the Company’s status as a BDC under the 1940 Act and a RIC under the Code, minimum stockholders’ equity, minimum asset coverage ratio, and prohibitions on certain fundamental changes at the Company or any subsidiary guarantor, as well as customary events of default with customary cure and notice, including, without limitation, nonpayment, misrepresentation in a material respect, breach of covenant, cross-default under other indebtedness of the Company or certain significant subsidiaries, certain judgments and orders, and certain events of bankruptcy. The Third Supplement, Fourth Supplement, Fifth Supplement and Sixth Supplement all include additional financial covenants related to asset coverage as well as other terms.
On September 25, 2018, the Company closed a registered public offering of $50,000 in aggregate principal amount of five-year unsecured notes that mature on October 1, 2023 (the "5.75% Unsecured Notes" and together with the 2016 Unsecured Notes, 2017A Unsecured Notes, 2018A Unsecured Notes, 2018B Unsecured Notes, 2019A Unsecured Notes, 2021A Unsecured Notes and 2022A Unsecured Notes, the "Unsecured Notes") pursuant to an indenture, dated August 20, 2018, as supplemented by a second supplemental indenture thereto, dated September 25, 2018 (together, the "2018B Indenture"). On October 17, 2018, in connection with the registered public offering, the Company issued an additional $1,750 aggregate principal amount of the 5.75% Unsecured Notes pursuant to the exercise of an overallotment option by the underwriters of the 5.75% Unsecured Notes.
On March 8, 2021, the Company redeemed $51,750 in aggregate principal amount of the 5.75% Unsecured Notes at a redemption price of 100% plus accrued and unpaid interest.
The 5.75% Unsecured Notes bore interest at an annual rate of 5.75%, payable quarterly on January 1, April 1, July 1 and October 1 of each year, which commenced on January 1, 2019. The 5.75% Unsecured Notes were listed on the New York Stock Exchange and traded under the trading symbol “NMFX” until September 13, 2020. On September 14, 2020, the 5.75% Unsecured Notes began trading on the NASDAQ under the ticker symbol "NMFCL", until redeemed on March 8, 2021.
The Unsecured Notes are unsecured obligations and rank senior in right of payment to the Company’s existing and future indebtedness, if any, that is expressly subordinated in right of payment to the Unsecured Notes; equal in right of payment to the Company’s existing and future unsecured indebtedness that is not so subordinated; effectively junior in right of payment to any of the Company’s secured indebtedness (including existing unsecured indebtedness that the Company later secures) to the extent of the value of the assets securing such indebtedness; and structurally junior to all existing and future indebtedness (including trade payables) incurred by the Company’s subsidiaries and financing vehicles.
The following table summarizes the interest expense and amortization of financing costs incurred on the Unsecured Notes for the years ended December 31, 2022, December 31, 2021 and December 31, 2020.
 Year Ended December 31,
 2022(1)2021(2)2020
Interest expense$25,033 $24,401 $23,839 
Amortization of financing costs$801 $1,864 $1,276 
Weighted average interest rate4.8 %4.7 %5.3 %
Effective interest rate4.9 %5.1 %5.5 %
Average debt outstanding$526,829 $516,611 $453,250 
(1)For the year ended December 31, 2022, amounts reported include interest and amortization of financing costs related to the 2022A Unsecured Notes for the period from June 15, 2022 (issuance date of the 2022A Unsecured Notes) to December 31, 2022.
(2)For the year ended December 31, 2021, amounts reported include interest and amortization of financing costs related to the 2021A Unsecured Notes for the period from January 29, 2021 (issuance date of the 2021A Unsecured Notes) to December 31, 2021.
As of December 31, 2022, December 31, 2021 and December 31, 2020, the outstanding balance on the Unsecured Notes was $531,500, $511,500 and $453,250, respectively, and the Company was in compliance with the terms of the NPA as of such dates, as applicable.
SBA-guaranteed debentures—On August 1, 2014 and August 25, 2017, respectively, SBIC I and SBIC II received licenses from the SBA to operate as SBICs.
The SBIC licenses allow SBICs to obtain leverage by issuing SBA-guaranteed debentures, subject to the issuance of a capital commitment by the SBA and other customary procedures. SBA-guaranteed debentures are non-recourse to the Company, interest only debentures with interest payable semi-annually and have a ten year maturity. The principal amount of SBA-guaranteed debentures is not required to be paid prior to maturity but may be prepaid at any time without penalty. The interest rate of SBA-guaranteed debentures is fixed on a semi-annual basis at a market-driven spread over U.S. Treasury Notes with ten year maturities. The SBA, as a creditor, will have a superior claim to the assets of SBIC I and SBIC II over the Company's stockholders in the event SBIC I and SBIC II are liquidated or the SBA exercises remedies upon an event of default.
The maximum amount of borrowings available under current SBA regulations for a single licensee is $150,000 as long as the licensee has at least $75,000 in regulatory capital, receives a capital commitment from the SBA and has been through an examination by the SBA subsequent to licensing. In June 2018, legislation amended the 1958 Act by increasing the individual leverage limit from $150,000 to $175,000, subject to SBA approvals.
As of December 31, 2022 and December 31, 2021, SBIC I had regulatory capital of $75,000 and $75,000, respectively, and SBA-guaranteed debentures outstanding of $150,000 and $150,000, respectively. As of December 31, 2022 and December 31, 2021, SBIC II had regulatory capital of $75,000 and $75,000, respectively, and $150,000 and $150,000, respectively, of SBA-guaranteed debentures outstanding. The SBA-guaranteed debentures incur upfront fees of 3.435%, which consists of a 1.00% commitment fee and a 2.435% issuance discount, which are amortized over the life of the SBA-guaranteed debentures.
The following table summarizes the Company’s SBA-guaranteed debentures as of December 31, 2022.
Issuance DateMaturity DateDebenture AmountInterest RateSBA Annual Charge
Fixed SBA-guaranteed debentures(1):    
March 25, 2015March 1, 2025$37,500 2.517 %0.355 %
September 23, 2015September 1, 202537,500 2.829 %0.355 %
September 23, 2015September 1, 202528,795 2.829 %0.742 %
March 23, 2016March 1, 202613,950 2.507 %0.742 %
September 21, 2016September 1, 20264,000 2.051 %0.742 %
September 20, 2017September 1, 202713,000 2.518 %0.742 %
March 21, 2018March 1, 202815,255 3.187 %0.742 %
Fixed SBA-guaranteed debentures(2):
September 19, 2018September 1, 202815,000 3.548 %0.222 %
September 25, 2019September 1, 202919,000 2.283 %0.222 %
March 25, 2020March 1, 203041,000 2.078 %0.222 %
March 25, 2020March 1, 203024,000 2.078 %0.275 %
September 23, 2020September 1, 203051,000 1.034 %0.275 %
Total SBA-guaranteed debentures $300,000   
(1)SBA-guaranteed debentures are held in SBIC I.
(2)SBA-guaranteed debentures are held in SBIC II.
Prior to pooling, the SBA-guaranteed debentures bear interest at an interim floating rate of LIBOR plus 0.30%. Once pooled, which occurs in March and September each year, the SBA-guaranteed debentures bear interest at a fixed rate that is set to the current 10-year treasury rate plus a spread at each pooling date.
The following table summarizes the interest expense and amortization of financing costs incurred on the SBA-guaranteed debentures for the years ended December 31, 2022, December 31, 2021 and December 31, 2020.
 Year Ended December 31,
 202220212020
Interest expense$8,104 $8,104 $8,006 
Amortization of financing costs$1,002 $1,002 $958 
Weighted average interest rate2.7 %2.7 %2.8 %
Effective interest rate3.0 %3.0 %3.1 %
Average debt outstanding$300,000 $300,000 $285,852 
The SBIC program is designed to stimulate the flow of private investor capital into eligible small businesses, as defined by the SBA. Under SBA regulations, SBICs are subject to regulatory requirements, including making investments in SBA-eligible small businesses, investing at least 25.0% of its investment capital in eligible smaller enterprises (as defined under the 1958 Act), placing certain limitations on the financing terms of investments, regulating the types of financing, prohibiting investments in smaller businesses with certain characteristics or in certain industries and requiring capitalization thresholds that limit distributions to the Company. SBICs are subject to an annual periodic examination by an SBA examiner to determine the SBIC's compliance with the relevant SBA regulations and an annual financial audit of its financial statements that are prepared on a basis of accounting other than GAAP (such as ASC 820) by an independent auditor. As of December 31, 2022, December 31, 2021 and December 31, 2020, SBIC I and SBIC II were in compliance with SBA regulatory requirements.
Leverage risk factors—The Company utilizes and may utilize leverage to the maximum extent permitted by the law for investment and other general business purposes. The Company's lenders will have fixed dollar claims on certain assets that are superior to the claims of the Company's common stockholders, and the Company would expect such lenders to seek recovery against these assets in the event of a default. The use of leverage also magnifies the potential for gain or loss on amounts invested. Leverage may magnify interest rate risk (particularly on the Company's fixed-rate investments), which is the risk that the prices of portfolio investments will fall or rise if market interest rates for those types of securities rise or fall. As a result, leverage may cause greater changes in the Company's net asset value. Similarly, leverage may cause a sharper decline in the Company's income than if the Company had not borrowed. Such a decline could negatively affect the Company's ability to make distributions to its stockholders. Leverage is generally considered a speculative investment technique. The Company's
ability to service any debt incurred will depend largely on financial performance and will be subject to prevailing economic conditions and competitive pressures.