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Borrowings
 3 Months Ended
Dec. 31, 2025
Debt Disclosure [Abstract]  
Borrowings Borrowings
Below is a summary of the Company's credit facilities as of December 31, 2025 and September 30, 2025:

 December 31, 2025
($ in millions)Aggregate Principal CommittedOutstanding PrincipalUnfunded CommitmentUnamortized Debt Financing CostsAvailability PeriodMaturity Date
ING Credit Agreement$1,235.0 $450.0 $785.0 $8.0 4/11/20294/11/2030
JPM SPV Facility700.0 566.0 134.0 4.7 7/3/20297/3/2030
DBNY SPV Facility400.0 355.0 45.0 3.2 7/25/20287/25/2029
MS SPV Facility400.0 233.4 166.6 3.0 7/3/20287/3/2029
Total$2,735.0 $1,604.4 $1,130.6 $18.9 

 September 30, 2025
($ in millions)Aggregate Principal CommittedOutstanding PrincipalUnfunded CommitmentUnamortized Debt Financing CostsAvailability PeriodMaturity Date
ING Credit Agreement$1,235.0 $370.0 $865.0 $8.5 4/11/20294/11/2030
JPM SPV Facility700.0 566.0 134.0 4.9 7/3/20297/3/2030
DBNY SPV Facility400.0 280.0 120.0 3.4 7/25/20287/25/2029
MS SPV Facility400.0 133.4 266.6 3.2 7/3/20287/3/2029
Total$2,735.0 $1,349.4 $1,385.6 $20.0 

Below is a summary of the Company's unsecured notes as of December 31, 2025 and September 30, 2025:

 December 31, 2025
($ in millions)Outstanding Principal Unamortized Financing CostsUnaccreted DiscountSwap Fair Value AdjustmentCarrying ValueFair ValueMaturity Date
2028 Notes$350.0 $(2.6)$(1.0)$8.5 $354.9 $377.4 11/14/2028
2029 Notes400.0 (3.6)(1.7)6.0 400.7 411.9 7/23/2029
2030 Notes400.0 (4.4)(0.1)3.7 399.2 402.4 7/15/2030
Total$1,150.0 $(10.6)$(2.8)$18.2 $1,154.8 $1,191.7 

 September 30, 2025
($ in millions)Outstanding Principal Unamortized Financing CostsUnaccreted DiscountSwap Fair Value AdjustmentCarrying ValueFair ValueMaturity Date
2028 Notes$350.0 $(2.8)$(1.1)$9.0 $355.1 $380.1 11/14/2028
2029 Notes400.0 (3.8)(1.8)6.5 400.9 415.1 7/23/2029
2030 Notes400.0 (4.7)(0.1)4.0 399.2 408.9 7/15/2030
Total$1,150.0 $(11.3)$(3.0)$19.5 $1,155.2 $1,204.1 
The table below presents the components of interest expense for the following periods:
($ in millions, except percentage)Three Months Ended December 31, 2025Three Months Ended December 31, 2024
Stated interest expense$42.2 $36.7 
Credit facility fees1.6 2.0 
Amortization of debt financing costs2.2 2.1 
Effect of interest rate swaps0.5 1.6 
Total interest expense$46.5 $42.4 
Weighted average interest rate (1)
6.255 %7.633 %
Weighted average outstanding balance$2,669.3 $1,965.2 
_____________________
(1) The weighted average interest rate includes the effect of the interest rate swaps and excludes the impact of credit facility fees and amortization of debt financing costs.

Credit Facilities

In connection with each of the credit facilities described below, the Company and, where applicable, the borrower subsidiary have made customary representations and warranties and are required to comply with various affirmative and negative covenants, reporting requirements and other customary requirements for similar credit facilities. Borrowings under each of the credit facilities are subject to the leverage restrictions contained in the Investment Company Act.

In addition, each of these credit facilities contains customary events of default for similar financing transactions. Upon the occurrence and during the continuation of an event of default, the lenders may terminate the commitments and declare the outstanding loans and all other obligations under the applicable credit facility immediately due and payable.
ING Credit Agreement

On March 25, 2022, the Company entered into a senior secured revolving credit agreement (as amended, the “ING Credit Agreement”) among the Company, as borrower, the lenders party thereto, and ING Capital LLC (“ING”), as administrative agent. As of December 31, 2025, the size of the ING Credit Agreement facility is $1,235 million (the “Maximum Commitment”). Following the availability period, the Company will be required in certain circumstances to prepay loans. The ING Credit Agreement provides for the issuance of letters of credit during the availability period in an aggregate amount of $25 million. Borrowings under the ING Credit Agreement may be used for general corporate purposes, including making investments and permitted distributions.

All obligations under the ING Credit Agreement are secured by a first-priority security interest (subject to certain exceptions) in substantially all of the present and future property and assets of the Company and of the current and certain future subsidiaries of the Company and guaranteed by such subsidiaries.

As of December 31, 2025, borrowings under the ING Credit Agreement are denominated in U.S. dollars and bear interest at a rate per annum equal to either (1) the SOFR, as adjusted, plus 1.875% per annum or (2) the alternative base rate (which is the greatest of the (a) prime rate, (b) the federal funds effective rate plus ½ of 1%, (c) the overnight bank funding rate plus ½ of 1%, (d) certain rates based on SOFR and (e) alternate base rate (“ABR”)) plus 0.875%, in each case, plus a SOFR adjustment of 0.10%; provided that, if at any time the Borrowing Base (as defined in the ING Credit Agreement) is greater than 1.60 times the Combined Debt Amount (as defined in the ING Credit Agreement), the interest rate margin with respect to (a) SOFR loans will be 1.75% plus a SOFR adjustment equal to 0.10% and (b) alternative base rate loans will be 0.75% plus a SOFR adjustment equal to 0.10%. The Company may elect either an ABR or SOFR borrowing at each drawdown request, and loans may be converted from one rate to another at any time at the Company's option, subject to certain conditions. The Company also pays a commitment fee of 0.375% per annum on the daily unused portion of the aggregate commitments under the ING Credit Agreement.

At any time during the availability period, the Company, as the borrower, may propose an increase in the Maximum Commitment to an amount not to exceed the greater of (a) $1,750.0 million and (b) 150% of shareholders’ equity as of the date
on which such increased amount is to be effective, subject to certain conditions, including the consent of the lenders to increase their commitments and of ING.

JPM SPV Facility

On February 24, 2023, the Company entered into a loan and security agreement (as amended and/or restated, from time to time, the “JPM Loan and Security Agreement”) among OSCF Lending SPV, LLC (“OSCF Lending SPV”), a wholly owned subsidiary of the Company, as borrower, the Company, as parent and servicer, Citibank, N.A., as collateral agent and securities intermediary, Virtus Group, LP, as collateral administrator, the lenders party thereto, and JPMorgan Chase Bank, National Association (“JPM”), as administrative agent, pursuant to which JPM agreed to extend credit to OSCF Lending SPV in an aggregate principal amount up to $700 million.

Subject to certain conditions, including consent of the lenders and JPM, as administrative agent, at any time during the availability period, OSCF Lending SPV may propose one or more increases in the maximum commitment up to an amount not to exceed $1.0 billion. Borrowings under the JPM Loan and Security Agreement bear interest at a rate per annum equal to the forward-looking term rate with a three-month tenor, based on SOFR plus (i) 1.50% if the borrowings are used to purchase broadly syndicated loans and other liquid debt securities (as defined in the JPM Loan and Security Agreement) or (ii) 1.90% on all other borrowings.

The obligations of OSCF Lending SPV under the JPM Loan and Security Agreement are secured by all of the assets held by OSCF Lending SPV.

SMBC SPV Facility

On September 29, 2023, the Company entered into a loan and security agreement (as amended and/or restated, from time to time, the “SMBC Loan and Security Agreement”) among OSCF Lending III SPV, LLC, a wholly owned subsidiary of the Company, as borrower, the Company, as transferor and servicer, Citibank, N.A., as the account bank, Virtus Group, LP, as collateral custodian, the lenders party thereto, and Sumitomo Mitsui Banking Corporation, as administrative agent and collateral agent. On September 29, 2025, the Company repaid all outstanding borrowings under the SMBC Loan and Security Agreement, following which the SMBC Loan and Security Agreement was terminated. Obligations under the SMBC Loan and Security Agreement would have otherwise matured on September 29, 2028.


CIBC SPV Facility

On November 21, 2023, the Company entered into a loan and servicing agreement (as amended and/or restated, from time to time, the “CIBC Loan and Servicing Agreement”) among OSCF Lending V SPV, LLC, a wholly owned subsidiary of the Company, as borrower, the Company, as transferor and servicer, Computershare Trust Company, N.A., as securities intermediary, collateral custodian, collateral agent and collateral administrator, the lenders party thereto, and Canadian Imperial Bank of Commerce, as administrative agent. On July 3, 2025, the Company repaid all outstanding borrowings under the CIBC Loan and Servicing Agreement, following which the CIBC Loan and Servicing Agreement was terminated. Obligations under the CIBC Loan and Servicing Agreement would have otherwise matured on November 21, 2025.


DBNY SPV Facility

On February 15, 2024, the Company entered into a loan financing and servicing agreement (as amended and/or restated, from time to time, the “DBNY Loan Financing and Servicing Agreement”), among OSCF Lending IV SPV, LLC (“OSCF Lending IV SPV”), a wholly owned subsidiary of the Company, as borrower, the Company, as servicer and equityholder, the lenders party thereto, Deutsche Bank AG, New York Branch (“DBNY”), as facility agent, the other agents parties thereto and Computershare Trust Company, N.A. as collateral agent and collateral custodian, pursuant to which DBNY has agreed to extend credit to OSCF Lending IV SPV in an aggregate principal amount up to $400 million (the “DBNY Facility Amount”) at any one time outstanding.

Borrowings under the DBNY Loan Financing and Servicing Agreement may be denominated in EUR, AUD, CAD, GBP or USD and bear interest at a rate per annum equal to the sum of, for any accrual period and any lender, (i) the applicable margin and (ii) the cost of funds rate for such accrual period and such lender. The applicable margin will be 1.60% per annum prior to the end of the availability period and 2.25% per annum thereafter; provided that, on and after the occurrence of any
Event of Default (as defined in the DBNY Loan Financing and Servicing Agreement), the applicable margin shall be increased by 2.00% per annum. The cost of funds rate will be, (a) for each conduit lender, the lower of (x) such conduit lender’s Commercial Paper Rate (as defined in the DBNY Loan Financing and Servicing Agreement) and (y) the SOFR for a three-month tenor as quoted by CME Group Benchmark Administration Limited (which shall in no event be lower than 0.25%), and (b) for each committed lender, the base rate determined by reference to the applicable benchmark index depending on the currency denomination of the advances.

The obligations of OSCF Lending IV SPV under the DBNY Loan Financing and Servicing Agreement are secured by all of the assets held by OSCF Lending IV SPV, including loans it has made or acquired, except for certain Retained Interests (as defined in the DBNY Loan Financing and Servicing Agreement).

Subject to certain conditions, including consent of DBNY, as facility agent, OSCF Lending IV SPV may (i) propose increases in the DBNY Facility Amount up to an amount not to exceed $1.0 billion in the aggregate, (ii) add additional lender groups and/or (iii) increase the commitment of any lender group with the consent of such lender group.

MS SPV Facility

On February 23, 2024, the Company entered into a loan and servicing agreement (as amended and/or restated from time to time, the “MS Loan and Servicing Agreement”), among OSCF Lending II SPV, LLC (“OSCF Lending II SPV”), a wholly owned subsidiary of the Company, as borrower, the Company, as transferor and servicer, Citibank, N.A., as the collateral agent, account bank and collateral custodian, Virtus Group, LP, as collateral administrator, each of the lenders from time to time party thereto, and Morgan Stanley Asset Funding, Inc. (“MS”), as the administrative agent, pursuant to which MS has agreed to extend credit to OSCF Lending II SPV in an aggregate principal amount up to $400 million at any one time outstanding. The MS Loan and Servicing Agreement has an “accordion” feature that allows the borrower, subject to certain conditions, to propose one or more increases in the maximum commitment up to an amount not to exceed $600 million.

Advances under the MS Loan and Servicing Agreement bear interest during the availability period at a rate per annum equal to (i) 1.60% if the borrowings are used to purchase broadly syndicated loans or (ii) 1.85% on all other borrowings; provided that the aggregate applicable margin shall not be less than 1.80% and that the applicable margin will increase by 0.50% per annum after the end of the availability period; and further provided that the applicable margin shall be increased by 2.00% per annum (i) during the existence of a Specified Event of Default (as defined in the MS Loan and Servicing Agreement), (ii) upon written notice from MS, as administrative agent (at the direction of required lenders) to OSCF Lending II SPV and the Company during the existence of any other Event of Default (as defined in the MS Loan and Servicing Agreement) or (iii) after a Facility Maturity Date (as defined in the MS Loan and Servicing Agreement).

The obligations of OSCF Lending II SPV under the MS Loan and Servicing Agreement are secured by all of the assets held by OSCF Lending II SPV, including certain loans it has made or acquired except for certain Retained Interests (as defined in the MS Loan and Servicing Agreement).

Unsecured Notes
2028 Unsecured Notes

On November 14, 2023, the Company issued $350 million aggregate principal amount of its 8.400% Notes due 2028 (the “2028 Unsecured Notes”) pursuant to an indenture, dated as of November 14, 2023 (the “Base Indenture”), between the Company and Deutsche Bank Trust Company Americas, as trustee, and a first supplemental indenture (the “First Supplemental Indenture”) to the Base Indenture.

The 2028 Unsecured Notes bear interest at a rate of 8.400% per year payable semi-annually in arrears on May 14 and November 14 of each year. The 2028 Unsecured Notes are the Company’s direct, unsecured obligations and rank senior in right of payment to its future indebtedness that is expressly subordinated in right of payment to the 2028 Unsecured Notes; equal in right of payment to its existing and future unsecured indebtedness that is not so subordinated; effectively junior in right of payment to any of its 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 its subsidiaries, financing vehicles or similar facilities.

The First Supplemental Indenture contains certain covenants, including a covenant requiring the Company to comply with Section 18(a)(1)(A) as modified by Section 61(a)(1) and (2) of the Investment Company Act, or any successor provisions, but
giving effect to any exemptive relief granted to the Company by the SEC and to provide financial information to the holders of the 2028 Unsecured Notes and the trustee if the Company should no longer be subject to the reporting requirements under the Exchange Act. These covenants are subject to important limitations and exceptions that are set forth in the First Supplemental Indenture.

In connection with the 2028 Unsecured Notes, the Company entered into an interest rate swap to more closely align the interest rate payable on the 2028 Unsecured Notes with its investment portfolio, which consists of predominately floating rate loans. Under the interest rate swap agreement, the Company receives a fixed interest rate of 8.400% and pays a floating interest rate of the three-month SOFR plus 4.0405% on a notional amount of $350 million.

2029 Unsecured Notes
On July 23, 2024, the Company issued $400 million aggregate principal amount of its 6.500% Notes due 2029 (the “2029 Unsecured Notes”) pursuant to the Base Indenture and a second supplemental indenture (the “Second Supplemental Indenture”) to the Base Indenture.
The 2029 Unsecured Notes bear interest at a rate of 6.500% per year payable semi-annually in arrears on January 23 and July 23 of each year. The 2029 Unsecured Notes are the Company’s direct, unsecured obligations and rank senior in right of payment to its future indebtedness that is expressly subordinated in right of payment to the 2029 Unsecured Notes; equal in right of payment to its existing and future unsecured indebtedness that is not so subordinated; effectively junior in right of payment to any of its 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 its subsidiaries, financing vehicles or similar facilities.
The Second Supplemental Indenture contains certain covenants, including a covenant requiring the Company to comply with Section 18(a)(1)(A) as modified by Section 61(a)(1) and (2) of the Investment Company Act, or any successor provisions, but giving effect to any exemptive relief granted to the Company by the SEC and to provide financial information to the holders of the 2029 Unsecured Notes and the trustee if the Company should no longer be subject to the reporting requirements under the Exchange Act. These covenants are subject to important limitations and exceptions that are set forth in the Second Supplemental Indenture.
In connection with the 2029 Unsecured Notes, the Company entered into an interest rate swap to more closely align the interest rate payable on the 2029 Unsecured Notes with its investment portfolio, which consists of predominately floating rate loans. Under the interest rate swap agreement, the Company receives a fixed interest rate of 6.500% and pays a floating interest rate of the three-month SOFR plus 2.5954% on a notional amount of $400 million.
2030 Unsecured Notes
On July 15, 2025, the Company issued $400 million aggregate principal amount of its 6.190% Notes due 2030 (the “2030 Unsecured Notes”) pursuant to the Base Indenture and a third supplemental indenture (the “Third Supplemental Indenture”) to the Base Indenture.
The 2030 Unsecured Notes bear interest at a rate of 6.190% per year payable semi-annually in arrears on January 15 and July 15 of each year. The 2030 Unsecured Notes are the Company's direct, unsecured obligations and rank senior in right of payment to its future indebtedness that is expressly subordinated in right of payment to the 2030 Unsecured Notes; equal in right of payment to its existing and future unsecured indebtedness that is not so subordinated; effectively junior in right of payment to any of its secured indebtedness (including existing unsecured indebtedness that we later secure) 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 its subsidiaries, financing vehicles or similar facilities.
The Third Supplemental Indenture contains certain covenants, including a covenant requiring the Company to comply with Section 18(a)(1)(A) as modified by Section 61(a)(1) and (2) of the Investment Company Act, or any successor provisions, but giving effect to any exemptive relief granted to us by the SEC and to provide financial information to the holders of the 2030 Unsecured Notes and the trustee if we should no longer be subject to the reporting requirements under the Exchange Act. These covenants are subject to important limitations and exceptions that are set forth in the Third Supplemental Indenture.
In connection with the 2030 Unsecured Notes, the Company entered into an interest rate swap to more closely align the interest rate payable on the 2030 Unsecured Notes with its investment portfolio, which consists of predominately floating rate
loans. Under the interest rate swap agreement, the Company receives a fixed interest rate of 6.190% and pays a floating interest rate of the three-month SOFR plus 2.4926% on a notional amount of $400 million.