v3.26.3
Summary of Significant Accounting Policies - Additional Information (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2026
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2026
USD ($)
Loan
Sep. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Loan
Equipment
Dec. 31, 2024
USD ($)
Disclosure Of Summary Of Significant Accounting Policies [Line Items]            
Fair value of companies investment percentage 95.90%   95.90%      
Market index of investment securities     $ 0      
Maturity period description     original maturity of three months or less      
Total cash, cash equivalents and restricted cash shown in the Consolidated Statements of Cash Flows $ 20,664,000 $ 9,467,000 $ 20,664,000 $ 9,467,000 $ 19,110,000 $ 9,627,000
Cash and cash equivalents 20,664,000 [1],[2]   20,664,000 [1],[2]   19,110,000 [3],[4]  
Restricted cash 0   0   $ 0  
Interest income 1,000,000 700,000 3,100,000 $ 3,700,000    
Dividend income 1,600,000   $ 7,500,000      
Debt security payment due     90 days      
Number of portfolio companies loans | Loan     3   3  
Number of portfolio companies equipment financing | Equipment         1  
Non accrual cost     $ 34,100,000   $ 20,700,000  
Fair value 17,200,000   $ 17,200,000   $ 15,200,000  
Fair value of debt investment portfolio     0.70%   0.70%  
Investment percentage     15.50% 15.70%    
Percentage of net tax- exempt income     90.00%      
Uncertain tax position     $ 0   $ 0  
Nondeductible federal excise tax     4.00%      
Ordinary income percentage     98.00%      
Capital gain net income percentage     98.20%      
Excise tax     4.00%      
Control Investments            
Disclosure Of Summary Of Significant Accounting Policies [Line Items]            
Dividend income 800,000   $ 5,100,000      
Affiliate Investments            
Disclosure Of Summary Of Significant Accounting Policies [Line Items]            
Dividend income 800,000 $ 1,400,000 2,400,000 $ 2,700,000    
Goldman Sachs Financial Square Government Institutional Fund            
Disclosure Of Summary Of Significant Accounting Policies [Line Items]            
Cash and cash equivalents $ 2,800,000   $ 2,800,000   $ 100,000  
Minimum            
Disclosure Of Summary Of Significant Accounting Policies [Line Items]            
Cash and cash equivalents interest rate     3.00%      
Investment percentage     90.00%      
Maximum            
Disclosure Of Summary Of Significant Accounting Policies [Line Items]            
Cash and cash equivalents interest rate     6.00%      
[1] All debt investments are income producing unless otherwise noted. All equity and warrant investments are non-income producing unless otherwise noted. Equipment financed under our equipment financing investments relates to operational equipment essential to revenue production for the portfolio company in the industry noted.
[2] All portfolio companies are located in North America or Europe. As of September 30, 2026, Trinity Capital Inc. (the “Company”) had twelve foreign domiciled portfolio companies, four of which are based in Canada and eight of which are based in Europe. As of September 30, 2026, these foreign domiciled portfolio investments represented 20.2% of total net asset value based on fair value. The Company generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the “Securities Act”). These investments are generally subject to certain limitations on resale and may be deemed to be “restricted securities” under the Securities Act.
[3] All debt investments are income producing unless otherwise noted. All equity and warrant investments are non-income producing unless otherwise noted. Equipment financed under our equipment financing investments relates to operational equipment essential to revenue production for the portfolio company in the industry noted.
[4] All portfolio companies are located in North America or Europe. As of December 31, 2025, Trinity Capital Inc. (the “Company”) had ten foreign domiciled portfolio companies, four of which are based in Canada and six of which are based in Europe. As of December 31, 2025, these foreign domiciled portfolio investments represented 15.2% of total net asset value based on fair value. The Company generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the “Securities Act”). These investments are generally subject to certain limitations on resale and may be deemed to be “restricted securities” under the Securities Act.