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Investments (Tables)
 12 Months Ended
Dec. 31, 2024
Schedule of Investments [Abstract]  
Schedule of Investments in and Advances to Affiliates
The following table summarizes the Company’s realized gains and losses and changes in unrealized appreciation and depreciation on control and affiliate investments for the years ended December 31, 2024, 2023, and 2022.
(in thousands)For the Year Ended December 31, 2024
Portfolio Company(1)
TypeFair Value as of
December 31, 2024		Interest & Dividend IncomeFee IncomeNet Change in Unrealized Appreciation (Depreciation) Realized Gain (Loss)
Control Investments
Coronado Aesthetics, LLCControl$69 $— $— $(193)$— 
Gibraltar Acquisition LLC(3)
Control59,263 5,301 146 (4,983)— 
Hercules Adviser LLC(4)
Control42,190 7,410 — 1,477 — 
Tectura CorporationControl11,657 692 — 140 — 
Total Control Investments$113,179 $13,403 $146 $(3,559)$— 
(in thousands)  For the Year Ended December 31, 2023
Portfolio Company(1)
TypeFair Value as of
December 31, 2023		Interest IncomeFee IncomeNet Change in Unrealized Appreciation (Depreciation) Realized Gain (Loss)
Control Investments
Coronado Aesthetics, LLCControl$262 $— $— $(57)$— 
Gibraltar Acquisition LLC(3)
Control62,512 3,344 95 9,656 — 
Hercules Adviser LLC(4)
Control40,713 608 — 9,560 — 
Tectura CorporationControl11,517 690 — 3,475 — 
Total Control Investments$115,004 $4,642 $95 $22,634 $— 
(in thousands)  For the Year Ended December 31, 2022
Portfolio Company(1)
TypeFair Value as of
December 31, 2022		Interest
Income		Fee IncomeNet Change in Unrealized Appreciation (Depreciation) Realized Gain (Loss)
Control Investments
Coronado Aesthetics, LLCControl$319 $— $— $(246)$— 
Gibraltar Business Capital, LLCControl36,944 3,385 68 (6,968)— 
Hercules Adviser LLCControl31,153 546 — 7,163 — 
Tectura CorporationControl8,042 690 — (227)— 
Total Control Investments$76,458 $4,621 $68 $(278)$— 
Affiliate Investments
Black Crow AI, Inc.(2)
Affiliate$— $— $— $(120)$3,772 
Pineapple Energy LLC(2)
Affiliate— 1,204 — 4,209 (2,014)
Total Affiliate Investments$— $1,204 $— $4,089 $1,758 
Total Control & Affiliate Investments$76,458 $5,825 $68 $3,811 $1,758 
(1)In accordance with Rules 3-09, 4-08(g), and Rule 10-01(b)(1) of Regulation S-X, (“Rule 3-09”, “Rule 4-08(g)”, and “Rule 10-01(b)(1)”, respectively), the Company must determine if its unconsolidated subsidiaries are considered “significant subsidiaries”. As of December 31, 2024, December 31, 2023, and December 31, 2022 there were no unconsolidated subsidiaries that are considered “significant subsidiaries”.
(2)As of September 30, 2022, Black Crow AI, Inc. and Pineapple Energy LLC were no longer affiliates as defined under the 1940 Act.
(3)Gibraltar Acquisition LLC is a wholly-owned subsidiary, which is the holding company for their wholly-owned affiliated portfolio companies, Gibraltar Business Capital, LLC and Gibraltar Equipment Finance, LLC. The subsidiary has no significant assets or liabilities, other than their equity and debt investments and equity interest in Gibraltar Business Capital, LLC and Gibraltar Equipment Finance, LLC, respectively.
(4)Hercules Adviser LLC is owned by Hercules Capital Management LLC and presented with Hercules Partner Holdings, LLC which are both wholly owned by the Company. Please refer to “Note 1” for additional disclosure.
Schedule of Investments Portfolio
The following table shows the fair value of the Company’s portfolio of investments by asset class as of December 31, 2024 and December 31, 2023:
(in thousands)December 31, 2024December 31, 2023
Investments at
Fair Value		Percentage of
Total Portfolio 		Investments at
Fair Value		Percentage of
Total Portfolio
Senior Secured Debt$3,419,044 93.4 %$2,987,577 92.0 %
Unsecured Debt75,557 2.1 %69,722 2.2 %
Preferred Stock53,802 1.5 %53,038 1.6 %
Common Stock74,855 2.0 %99,132 3.1 %
Warrants30,500 0.8 %33,969 1.0 %
Investment Funds & Vehicles6,220 0.2 %4,608 0.1 %
Total$3,659,978 100.0 %$3,248,046 100.0 %
A summary of the Company’s investment portfolio, at value, by geographic location as of December 31, 2024 and December 31, 2023 is shown as follows:
(in thousands)December 31, 2024December 31, 2023
Investments at
Fair Value		Percentage of
Total Portfolio		Investments at
Fair Value		Percentage of
Total Portfolio
United States$3,288,737 89.9 %$2,861,615 88.1 %
United Kingdom142,183 3.9 %222,136 6.9 %
Israel88,066 2.4 %52,868 1.6 %
Netherlands59,157 1.6 %89,995 2.8 %
Germany49,255 1.3 %1,144 0.0 %
Canada16,251 0.4 %15,730 0.5 %
Denmark9,284 0.3 %4,173 0.1 %
Ireland4,649 0.1 %— 0.0 %
Singapore1,996 0.1 %— 0.0 %
Other400 0.0 %385 0.0 %
Total$3,659,978 100.0 %$3,248,046 100.0 %
The following table shows the fair value of the Company’s portfolio by industry sector as of December 31, 2024 and December 31, 2023:
(in thousands)December 31, 2024December 31, 2023
 Investments at
Fair Value		Percentage of
Total Portfolio 		Investments at
Fair Value		Percentage of
Total Portfolio
Software$1,081,100 29.5 %$764,985 23.6 %
Drug Discovery & Development1,080,390 29.5 %1,257,699 38.7 %
Healthcare Services, Other610,184 16.7 %300,079 9.3 %
Consumer & Business Services372,641 10.2 %525,973 16.2 %
Electronics & Computer Hardware162,888 4.5 %20,324 0.6 %
Diversified Financial Services113,491 3.1 %114,722 3.5 %
Medical Devices & Equipment74,962 2.0 %22,096 0.7 %
Space Technologies45,700 1.2 %— 0.0 %
Biotechnology Tools35,434 1.0 %48,381 1.5 %
Communications & Networking27,700 0.8 %29,400 0.9 %
Sustainable and Renewable Technology27,696 0.8 %9,581 0.3 %
Information Services24,356 0.7 %126,605 3.9 %
Consumer & Business Products1,497 0.0 %2,589 0.1 %
Manufacturing Technology1,162 0.0 %11,006 0.3 %
Semiconductors704 0.0 %1,205 0.0 %
Media/Content/Info63 0.0 %12,704 0.4 %
Drug Delivery10 0.0 %21 0.0 %
Surgical Devices— 0.0 %676 0.0 %
Total$3,659,978 100.0 %$3,248,046 100.0 %
The following table summarizes information related to our SBICs as of December 31, 2024 and December 31, 2023.
December 31, 2024December 31, 2023
DescriptionHC IVSBIC VHC IVSBIC V
Number of investments held331125— 
Fair value of investments (in millions)$377.7$155.6$331.5$— 
Percentage of fair value of investments based on the Company's total investment portfolio10.3 %4.3 %10.2 %0.0 %
Tangible assets (in millions)$382.9$157.8$341.8$— 
Percentage of tangible assets based on the Company's total assets10.0 %4.1 %10.0 %0.0 %
Schedule of Investment Collateral The Company's investments were collateralized as follows as of December 31, 2024 and December 31, 2023:
Percentage of debt investments (at fair value), as of
December 31, 2024December 31, 2023
Senior Secured First Lien
All assets including intellectual property67.1 %52.3 %
All assets with negative pledge on intellectual property14.2 %24.0 %
“Last-out” with security interest in all of the assets9.7 %12.5 %
Total senior secured first lien position91.0 %88.8 %
Second lien6.8 %8.9 %
Unsecured2.2 %2.3 %
Total debt investments at fair value100.0 %100.0 %
Schedule of Fair Value and Location of the Company's Derivative Instruments The following is a summary of the fair value and location of the Company’s derivative instruments in the Consolidated Statements of Assets and Liabilities held as of December 31, 2024 and December 31, 2023:
(in thousands)Fair Value
Derivative InstrumentStatement LocationDecember 31, 2024December 31, 2023
Foreign currency forward contractOther assets$538 $— 
Foreign currency forward contractAccounts payable and accrued liabilities— 766 
Total$538 $766 
Schedule of Net Realized and Unrealized Gains and Losses
Net realized and unrealized gains and losses on derivative instruments recorded by the Company during the years ended December 31, 2024 and December 31, 2023 are in the following locations in the Consolidated Statements of Operations:
(in thousands)Year Ended December 31,
Derivative InstrumentStatement Location20242023
Foreign currency forward contractNet realized gain (loss) - Non-control / Non-affiliate investments$(849)$— 
Foreign currency forward contractNet change in unrealized appreciation (depreciation) - Non-control / Non-affiliate investments1,305 (766)
Total$456 $(766)
Schedule of Investment Interest Income and Fee Income
The Company’s investment portfolio generates interest, fee, and dividend income. The composition of the Company’s interest income and fee income is as follows:
(in thousands)Year Ended December 31,
202420232022
Contractual interest income$355,470 $351,883 $249,375 
Exit fee interest income44,448 45,747 32,063 
PIK interest income51,270 24,670 20,455 
Dividend income7,900 1,400 — 
Other investment income(1)
8,107 10,725 5,365 
Total interest and dividend income$467,195 $434,425 $307,258 
Recurring fee income$9,507 $8,835 $7,834 
Fee income - expired commitments2,442 1,695 1,502 
Accelerated fee income - early repayments14,447 15,713 5,094 
Total fee income$26,396 $26,243 $14,430 
(1)Other investment income includes OID interest income and interest recorded on other assets.
Schedule of Unamortized Capitalized Fee Income
As of December 31, 2024 and 2023, unamortized capitalized fee income was recorded as follows:
(in millions)As of December 31,
20242023
Offset against debt investment cost$36.9 $32.9 
Deferred obligation contingent on funding or other milestone9.1 9.4 
Total Unamortized Fee Income$46.0 $42.3 
Schedule of Loan Exit Fees Receivable
As of December 31, 2024 and 2023, loan exit fees receivable were recorded as follows:
(in millions)As of December 31,
20242023
Included within debt investment cost$39.2 $35.9 
Deferred receivable related to expired commitments3.0 4.3 
Total Exit Fees Receivable$42.2 $40.2