N-2 - USD ($) $ in Millions	3 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Cover [Abstract]
Entity Central Index Key	0001414932
Amendment Flag	false
Securities Act File Number	1-33901
Document Type	10-Q
Entity Registrant Name	Oaktree Specialty Lending Corporation
Entity Address, Address Line One	333 South Grand Avenue
Entity Address, Address Line Two	28th Floor
Entity Address, City or Town	Los Angeles
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	90071
City Area Code	213
Local Phone Number	830-6300
Entity Emerging Growth Company	false
Financial Highlights [Abstract]
Senior Securities [Table Text Block]
Senior Securities Amount	$ 1,514.4	$ 1,300.0
Capital Stock, Long-Term Debt, and Other Securities [Abstract]
Long Term Debt [Table Text Block]	Syndicated Facility On November 30, 2017, the Company entered into a senior secured revolving credit facility (as amended and restated, the “Syndicated Facility”) pursuant to a Senior Secured Revolving Credit Agreement with the lenders party thereto, ING Capital LLC, as administrative agent, ING Capital LLC, JPMorgan Chase Bank, N.A., BofA Securities, Inc. and MUFG Union Bank, N.A., as joint lead arrangers and joint bookrunners, and JPMorgan Chase Bank, N.A. and Bank of America, N.A., as syndication agents. The Syndicated Facility provides that the Company may use the proceeds of the loans and issuances of letters of credit under the Syndicated Facility for general corporate purposes, including acquiring and funding leveraged loans, mezzanine loans, high-yield securities, convertible securities, preferred stock, common stock and other investments. The Syndicated Facility further allows the Company to request letters of credit from ING Capital LLC, as the issuing bank. As of December 31, 2022, the size of the Syndicated Facility was $1.0 billion. In addition, pursuant to an "accordion" feature, the Company may increase the size of the facility to up to the greater of $1.25 billion and the Company's net worth, as defined in the facility, under certain circumstances. As of December 31, 2022, (i) the period during which the Company may make drawings will expire on May 4, 2025 and the maturity date is May 4, 2026 and (ii) the interest rate margin for (a) LIBOR loans (which may be 1-, 2-, 3- or 6-month, at the Company’s option) was 2.00% and (b) alternate base rate loans was 1.00%. The Syndicated Facility is secured by substantially all of the Company’s assets (excluding, among other things, investments held in and by certain subsidiaries of the Company (including OCSL Senior Funding II LLC) or investments in certain portfolio companies of the Company) and guaranteed by certain subsidiaries of the Company. As of December 31, 2022, except for assets that were held by OCSL Senior Funding II LLC and certain immaterial subsidiaries, substantially all of the Company's assets are pledged as collateral under the Syndicated Facility. The Syndicated Facility requires the Company to, among other things, (i) make representations and warranties regarding the collateral as well as each of the Company’s portfolio companies’ businesses, (ii) agree to certain indemnification obligations, and (iii) comply with various affirmative and negative covenants, reporting requirements and other customary requirements for similar revolving credit facilities, including covenants related to: (A) limitations on the incurrence of additional indebtedness and liens, (B) limitations on certain investments, (C) limitations on certain asset transfers and restricted payments, (D) maintaining a certain minimum stockholders’ equity, (E) maintaining a ratio of total assets (less total liabilities) to total indebtedness, of the Company and its subsidiaries (subject to certain exceptions), of not less than 1.50 to 1.00, (F) maintaining a ratio of consolidated EBITDA to consolidated interest expense, of the Company and its subsidiaries (subject to certain exceptions), of not less than 2.25 to 1.00, (G) maintaining a minimum liquidity and net worth, and (H) limitations on the creation or existence of agreements that prohibit liens on certain properties of the Company and certain of its subsidiaries. The Syndicated Facility also includes usual and customary default provisions such as the failure to make timely payments under the facility, the occurrence of a change in control, and the failure by the Company to materially perform under the agreements governing the facility, which, if not complied with, could accelerate repayment under the facility. As of December 31, 2022, the Company was in compliance with all financial covenants under the Syndicated Facility. In addition to the asset coverage ratio described above, borrowings under the Syndicated Facility (and the incurrence of certain other permitted debt) are subject to compliance with a borrowing base that will apply different advance rates to different types of assets in the Company’s portfolio. Each loan or letter of credit originated or assumed under the Syndicated Facility is subject to the satisfaction of certain conditions. As of December 31, 2022 and September 30, 2022, the Company had $695.0 million and $540.0 million of borrowings outstanding under the Syndicated Facility, respectively, which had a fair value of $695.0 million and $540.0 million, respectively. The Company's borrowings under the Syndicated Facility bore interest at a weighted average interest rate of 5.849% and 2.174% for the three months ended December 31, 2022 and 2021, respectively. For the three months ended December 31, 2022 and 2021, the Company recorded interest expense (inclusive of fees) of $10.0 million and $3.8 million, respectively, related to the Syndicated Facility. Citibank Facility On March 19, 2021, the Company became party to a revolving credit facility (as amended and/or restated from time to time, the “Citibank Facility”) with OCSL Senior Funding II LLC (formerly OCSI Senior Funding II LLC), the Company’s wholly-owned, special purpose financing subsidiary, as the borrower, the Company, as collateral manager and seller, each of the lenders from time to time party thereto, Citibank, N.A., as administrative agent, and Wells Fargo Bank, National Association, as collateral agent and custodian. As of December 31, 2022, the Company was able to borrow up to $200 million under the Citibank Facility (subject to borrowing base and other limitations). As of December 31, 2022, the reinvestment period under the Citibank Facility was scheduled to expire on November 18, 2023 and the maturity date for the Citibank Facility was November 18, 2024. As of December 31, 2022, borrowings under the Citibank Facility are subject to certain customary advance rates and accrue interest at a rate equal to LIBOR plus between 1.25% and 2.20% per annum on broadly syndicated loans, subject to observable market depth and pricing, and LIBOR plus 2.25% per annum on all other eligible loans during the reinvestment period. In addition, as of December 31, 2022, for the duration of the reinvestment period there is a non-usage fee payable of 0.50% per annum on the undrawn amount under the Citibank Facility. The minimum asset coverage ratio applicable to the Company under the Citibank Facility is 150% as determined in accordance with the requirements of the Investment Company Act. Borrowings under the Citibank Facility are secured by all of the assets of OCSL Senior Funding II LLC and all of the Company’s equity interests in OCSL Senior Funding II LLC. The Company may use the Citibank Facility to fund a portion of its loan origination activities and for general corporate purposes. Each loan origination under the Citibank Facility is subject to the satisfaction of certain conditions. As of December 31, 2022 and September 30, 2022, the Company had $165.0 million and $160.0 million outstanding under the Citibank Facility, respectively, which had a fair value of $165.0 million and $160.0 million, respectively. The Company's borrowings under the Citibank Facility bore interest at a weighted average interest rate of 6.508% and 1.830% for the three months ended December 31, 2022 and 2021, respectively. For the three months ended December 31, 2022 and 2021, the Company recorded interest expense (inclusive of fees) of $2.7 million and $0.8 million, respectively, related to the Citibank Facility. 2025 Notes On February 25, 2020, the Company issued $300.0 million in aggregate principal amount of the 2025 Notes for net proceeds of $293.8 million after deducting OID of $2.5 million, underwriting commissions and discounts of $3.0 million and offering costs of $0.7 million. The OID on the 2025 Notes is amortized based on the effective interest method over the term of the 2025 Notes. The 2025 Notes were issued pursuant to an indenture, dated April 30, 2012, as supplemented by the fifth supplemental indenture, dated February 25, 2020 (collectively, the "2025 Notes Indenture"), between the Company and Deutsche Bank Trust Company Americas (the "Trustee"). The 2025 Notes are the Company's general unsecured obligations that rank senior in right of payment to all of the Company's existing and future indebtedness that is expressly subordinated in right of payment to the 2025 Notes. The 2025 Notes rank equally in right of payment with all of the Company's existing and future liabilities that are not so subordinated. The 2025 Notes effectively rank junior to any of the Company's secured indebtedness (including unsecured indebtedness that the Company later secures) to the extent of the value of the assets securing such indebtedness. The 2025 Notes rank structurally junior to all existing and future indebtedness (including trade payables) incurred by the Company's subsidiaries, financing vehicles or similar facilities. Interest on the 2025 Notes is paid semi-annually on February 25 and August 25 at a rate of 3.500% per annum. The 2025 Notes mature on February 25, 2025 and may be redeemed in whole or in part at any time or from time to time at the Company's option prior to maturity at par plus a “make-whole” premium, if applicable. In addition, holders of the 2025 Notes can require the Company to repurchase the 2025 Notes at 100% of their principal amount upon the occurrence of certain change of control events as described in the 2025 Notes Indenture. The 2025 Notes were issued in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof. During the three months ended December 31, 2022, the Company did not repurchase any of the 2025 Notes in the open market. The 2025 Notes Indenture contains certain covenants, including covenants requiring the Company's compliance with the asset coverage requirements set forth in 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 U.S. Securities and Exchange Commission ("SEC")), as well as covenants requiring the Company to provide financial information to the holders of the 2025 Notes and the Trustee if the Company ceases to be subject to the reporting requirements of the Securities Exchange Act of 1934, as amended (the "Exchange Act"). These covenants are subject to limitations and exceptions that are described in the 2025 Notes Indenture. 2027 Notes On May 18, 2021, the Company issued $350.0 million in aggregate principal amount of the 2027 Notes for net proceeds of $344.8 million after deducting OID of $1.0 million, underwriting commissions and discounts of $3.5 million and offering costs of $0.7 million. The OID on the 2027 Notes is amortized based on the effective interest method over the term of the 2027 Notes. The 2027 Notes were issued pursuant to an indenture, dated April 30, 2012, as supplemented by the sixth supplemental indenture, dated May 18, 2021 (collectively, the "2027 Notes Indenture"), between the Company and the Trustee. The 2027 Notes are the Company's general unsecured obligations that rank senior in right of payment to all of the Company's existing and future indebtedness that is expressly subordinated in right of payment to the 2027 Notes. The 2027 Notes rank equally in right of payment with all of the Company's existing and future liabilities that are not so subordinated. The 2027 Notes effectively rank junior to any of the Company's secured indebtedness (including unsecured indebtedness that the Company later secures) to the extent of the value of the assets securing such indebtedness. The 2027 Notes rank structurally junior to all existing and future indebtedness (including trade payables) incurred by the Company's subsidiaries, financing vehicles or similar facilities. Interest on the 2027 Notes is paid semi-annually on January 15 and July 15, beginning on January 15, 2022, at a rate of 2.700% per annum. The 2027 Notes mature on January 15, 2027 and may be redeemed in whole or in part at any time or from time to time at the Company's option prior to maturity at par plus a “make-whole” premium, if applicable. In addition, holders of the 2027 Notes can require the Company to repurchase the 2027 Notes at 100% of their principal amount upon the occurrence of certain change of control events as described in the 2027 Notes Indenture. The 2027 Notes were issued in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof. During the three months ended December 31, 2022, the Company did not repurchase any of the 2027 Notes in the open market. The 2027 Notes Indenture contains certain covenants, including covenants requiring the Company's compliance with the asset coverage requirements set forth in 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), as well as covenants requiring the Company to provide financial information to the holders of the 2027 Notes and the Trustee if the Company ceases to be subject to the reporting requirements of the Exchange Act. These covenants are subject to limitations and exceptions that are described in the 2027 Notes Indenture. In connection with the 2027 Notes, the Company entered into an interest rate swap to more closely align the interest rates of its liabilities 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 2.700% and pays a floating interest rate of the three-month LIBOR plus 1.658% on a notional amount of $350 million. The Company designated the interest rate swap as the hedging instrument in an effective hedge accounting relationship. See Note 12 for more information regarding the interest rate swap.
Syndicated Facility [Member]
Capital Stock, Long-Term Debt, and Other Securities [Abstract]
Long Term Debt, Title [Text Block]	Syndicated Facility
Long Term Debt, Structuring [Text Block]	On November 30, 2017, the Company entered into a senior secured revolving credit facility (as amended and restated, the “Syndicated Facility”) pursuant to a Senior Secured Revolving Credit Agreement with the lenders party thereto, ING Capital LLC, as administrative agent, ING Capital LLC, JPMorgan Chase Bank, N.A., BofA Securities, Inc. and MUFG Union Bank, N.A., as joint lead arrangers and joint bookrunners, and JPMorgan Chase Bank, N.A. and Bank of America, N.A., as syndication agents. The Syndicated Facility provides that the Company may use the proceeds of the loans and issuances of letters of credit under the Syndicated Facility for general corporate purposes, including acquiring and funding leveraged loans, mezzanine loans, high-yield securities, convertible securities, preferred stock, common stock and other investments. The Syndicated Facility further allows the Company to request letters of credit from ING Capital LLC, as the issuing bank. As of December 31, 2022, the size of the Syndicated Facility was $1.0 billion. In addition, pursuant to an "accordion" feature, the Company may increase the size of the facility to up to the greater of $1.25 billion and the Company's net worth, as defined in the facility, under certain circumstances. As of December 31, 2022, (i) the period during which the Company may make drawings will expire on May 4, 2025 and the maturity date is May 4, 2026 and (ii) the interest rate margin for (a) LIBOR loans (which may be 1-, 2-, 3- or 6-month, at the Company’s option) was 2.00% and (b) alternate base rate loans was 1.00%. The Syndicated Facility is secured by substantially all of the Company’s assets (excluding, among other things, investments held in and by certain subsidiaries of the Company (including OCSL Senior Funding II LLC) or investments in certain portfolio companies of the Company) and guaranteed by certain subsidiaries of the Company. As of December 31, 2022, except for assets that were held by OCSL Senior Funding II LLC and certain immaterial subsidiaries, substantially all of the Company's assets are pledged as collateral under the Syndicated Facility.
Long Term Debt, Dividends and Covenants [Text Block]	The Syndicated Facility requires the Company to, among other things, (i) make representations and warranties regarding the collateral as well as each of the Company’s portfolio companies’ businesses, (ii) agree to certain indemnification obligations, and (iii) comply with various affirmative and negative covenants, reporting requirements and other customary requirements for similar revolving credit facilities, including covenants related to: (A) limitations on the incurrence of additional indebtedness and liens, (B) limitations on certain investments, (C) limitations on certain asset transfers and restricted payments, (D) maintaining a certain minimum stockholders’ equity, (E) maintaining a ratio of total assets (less total liabilities) to total indebtedness, of the Company and its subsidiaries (subject to certain exceptions), of not less than 1.50 to 1.00, (F) maintaining a ratio of consolidated EBITDA to consolidated interest expense, of the Company and its subsidiaries (subject to certain exceptions), of not less than 2.25 to 1.00, (G) maintaining a minimum liquidity and net worth, and (H) limitations on the creation or existence of agreements that prohibit liens on certain properties of the Company and certain of its subsidiaries. The Syndicated Facility also includes usual and customary default provisions such as the failure to make timely payments under the facility, the occurrence of a change in control, and the failure by the Company to materially perform under the agreements governing the facility, which, if not complied with, could accelerate repayment under the facility. As of December 31, 2022, the Company was in compliance with all financial covenants under the Syndicated Facility. In addition to the asset coverage ratio described above, borrowings under the Syndicated Facility (and the incurrence of certain other permitted debt) are subject to compliance with a borrowing base that will apply different advance rates to different types of assets in the Company’s portfolio. Each loan or letter of credit originated or assumed under the Syndicated Facility is subject to the satisfaction of certain conditions.
Citibank Facility [Member]
Capital Stock, Long-Term Debt, and Other Securities [Abstract]
Long Term Debt, Title [Text Block]	Citibank Facility
Long Term Debt, Structuring [Text Block]	On March 19, 2021, the Company became party to a revolving credit facility (as amended and/or restated from time to time, the “Citibank Facility”) with OCSL Senior Funding II LLC (formerly OCSI Senior Funding II LLC), the Company’s wholly-owned, special purpose financing subsidiary, as the borrower, the Company, as collateral manager and seller, each of the lenders from time to time party thereto, Citibank, N.A., as administrative agent, and Wells Fargo Bank, National Association, as collateral agent and custodian. As of December 31, 2022, the Company was able to borrow up to $200 million under the Citibank Facility (subject to borrowing base and other limitations). As of December 31, 2022, the reinvestment period under the Citibank Facility was scheduled to expire on November 18, 2023 and the maturity date for the Citibank Facility was November 18, 2024.
Long Term Debt, Dividends and Covenants [Text Block]	As of December 31, 2022, borrowings under the Citibank Facility are subject to certain customary advance rates and accrue interest at a rate equal to LIBOR plus between 1.25% and 2.20% per annum on broadly syndicated loans, subject to observable market depth and pricing, and LIBOR plus 2.25% per annum on all other eligible loans during the reinvestment period. In addition, as of December 31, 2022, for the duration of the reinvestment period there is a non-usage fee payable of 0.50% per annum on the undrawn amount under the Citibank Facility. The minimum asset coverage ratio applicable to the Company under the Citibank Facility is 150% as determined in accordance with the requirements of the Investment Company Act. Borrowings under the Citibank Facility are secured by all of the assets of OCSL Senior Funding II LLC and all of the Company’s equity interests in OCSL Senior Funding II LLC. The Company may use the Citibank Facility to fund a portion of its loan origination activities and for general corporate purposes. Each loan origination under the Citibank Facility is subject to the satisfaction of certain conditions.
2025 Notes [Member]
Capital Stock, Long-Term Debt, and Other Securities [Abstract]
Long Term Debt, Title [Text Block]	2025 Notes
Long Term Debt, Structuring [Text Block]	On February 25, 2020, the Company issued $300.0 million in aggregate principal amount of the 2025 Notes for net proceeds of $293.8 million after deducting OID of $2.5 million, underwriting commissions and discounts of $3.0 million and offering costs of $0.7 million. The OID on the 2025 Notes is amortized based on the effective interest method over the term of the 2025 Notes. The 2025 Notes were issued pursuant to an indenture, dated April 30, 2012, as supplemented by the fifth supplemental indenture, dated February 25, 2020 (collectively, the "2025 Notes Indenture"), between the Company and Deutsche Bank Trust Company Americas (the "Trustee"). The 2025 Notes are the Company's general unsecured obligations that rank senior in right of payment to all of the Company's existing and future indebtedness that is expressly subordinated in right of payment to the 2025 Notes. The 2025 Notes rank equally in right of payment with all of the Company's existing and future liabilities that are not so subordinated. The 2025 Notes effectively rank junior to any of the Company's secured indebtedness (including unsecured indebtedness that the Company later secures) to the extent of the value of the assets securing such indebtedness. The 2025 Notes rank structurally junior to all existing and future indebtedness (including trade payables) incurred by the Company's subsidiaries, financing vehicles or similar facilities. Interest on the 2025 Notes is paid semi-annually on February 25 and August 25 at a rate of 3.500% per annum. The 2025 Notes mature on February 25, 2025 and may be redeemed in whole or in part at any time or from time to time at the Company's option prior to maturity at par plus a “make-whole” premium, if applicable. In addition, holders of the 2025 Notes can require the Company to repurchase the 2025 Notes at 100% of their principal amount upon the occurrence of certain change of control events as described in the 2025 Notes Indenture. The 2025 Notes were issued in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof. During the three months ended December 31, 2022, the Company did not repurchase any of the 2025 Notes in the open market.
Long Term Debt, Dividends and Covenants [Text Block]	The 2025 Notes Indenture contains certain covenants, including covenants requiring the Company's compliance with the asset coverage requirements set forth in 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 U.S. Securities and Exchange Commission ("SEC")), as well as covenants requiring the Company to provide financial information to the holders of the 2025 Notes and the Trustee if the Company ceases to be subject to the reporting requirements of the Securities Exchange Act of 1934, as amended (the "Exchange Act"). These covenants are subject to limitations and exceptions that are described in the 2025 Notes Indenture.
2027 Notes [Member]
Capital Stock, Long-Term Debt, and Other Securities [Abstract]
Long Term Debt, Title [Text Block]	2027 Notes
Long Term Debt, Structuring [Text Block]	On May 18, 2021, the Company issued $350.0 million in aggregate principal amount of the 2027 Notes for net proceeds of $344.8 million after deducting OID of $1.0 million, underwriting commissions and discounts of $3.5 million and offering costs of $0.7 million. The OID on the 2027 Notes is amortized based on the effective interest method over the term of the 2027 Notes. The 2027 Notes were issued pursuant to an indenture, dated April 30, 2012, as supplemented by the sixth supplemental indenture, dated May 18, 2021 (collectively, the "2027 Notes Indenture"), between the Company and the Trustee. The 2027 Notes are the Company's general unsecured obligations that rank senior in right of payment to all of the Company's existing and future indebtedness that is expressly subordinated in right of payment to the 2027 Notes. The 2027 Notes rank equally in right of payment with all of the Company's existing and future liabilities that are not so subordinated. The 2027 Notes effectively rank junior to any of the Company's secured indebtedness (including unsecured indebtedness that the Company later secures) to the extent of the value of the assets securing such indebtedness. The 2027 Notes rank structurally junior to all existing and future indebtedness (including trade payables) incurred by the Company's subsidiaries, financing vehicles or similar facilities. Interest on the 2027 Notes is paid semi-annually on January 15 and July 15, beginning on January 15, 2022, at a rate of 2.700% per annum. The 2027 Notes mature on January 15, 2027 and may be redeemed in whole or in part at any time or from time to time at the Company's option prior to maturity at par plus a “make-whole” premium, if applicable. In addition, holders of the 2027 Notes can require the Company to repurchase the 2027 Notes at 100% of their principal amount upon the occurrence of certain change of control events as described in the 2027 Notes Indenture. The 2027 Notes were issued in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof. During the three months ended December 31, 2022, the Company did not repurchase any of the 2027 Notes in the open market.
Long Term Debt, Dividends and Covenants [Text Block]	The 2027 Notes Indenture contains certain covenants, including covenants requiring the Company's compliance with the asset coverage requirements set forth in 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), as well as covenants requiring the Company to provide financial information to the holders of the 2027 Notes and the Trustee if the Company ceases to be subject to the reporting requirements of the Exchange Act. These covenants are subject to limitations and exceptions that are described in the 2027 Notes Indenture.

false

10-Q

Entity Address, Address Line One

333 South Grand Avenue

Entity Address, City or Town

Los Angeles

Entity Address, Postal Zip Code

90071

Local Phone Number

830-6300

Financial Highlights [Abstract]

Senior Securities Amount

$ 1,514.4

$ 1,300.0

Long Term Debt [Table Text Block]

Syndicated Facility

On November 30, 2017, the Company entered into a senior secured revolving credit facility (as amended and restated, the “Syndicated Facility”) pursuant to a Senior Secured Revolving Credit Agreement with the lenders party thereto, ING Capital LLC, as administrative agent, ING Capital LLC, JPMorgan Chase Bank, N.A., BofA Securities, Inc. and MUFG Union Bank, N.A., as joint lead arrangers and joint bookrunners, and JPMorgan Chase Bank, N.A. and Bank of America, N.A., as syndication agents. The Syndicated Facility provides that the Company may use the proceeds of the loans and issuances of letters of credit under the Syndicated Facility for general corporate purposes, including acquiring and funding leveraged loans, mezzanine loans, high-yield securities, convertible securities, preferred stock, common stock and other investments. The Syndicated Facility further allows the Company to request letters of credit from ING Capital LLC, as the issuing bank.

As of December 31, 2022, the size of the Syndicated Facility was $1.0 billion. In addition, pursuant to an "accordion" feature, the Company may increase the size of the facility to up to the greater of $1.25 billion and the Company's net worth, as defined in the facility, under certain circumstances.

As of December 31, 2022, (i) the period during which the Company may make drawings will expire on May 4, 2025 and the maturity date is May 4, 2026 and (ii) the interest rate margin for (a) LIBOR loans (which may be 1-, 2-, 3- or 6-month, at the Company’s option) was 2.00% and (b) alternate base rate loans was 1.00%.

The Syndicated Facility is secured by substantially all of the Company’s assets (excluding, among other things, investments held in and by certain subsidiaries of the Company (including OCSL Senior Funding II LLC) or investments in certain portfolio companies of the Company) and guaranteed by certain subsidiaries of the Company. As of December 31, 2022, except for assets that were held by OCSL Senior Funding II LLC and certain immaterial subsidiaries, substantially all of the Company's assets are pledged as collateral under the Syndicated Facility.

The Syndicated Facility requires the Company to, among other things, (i) make representations and warranties regarding the collateral as well as each of the Company’s portfolio companies’ businesses, (ii) agree to certain indemnification obligations, and (iii) comply with various affirmative and negative covenants, reporting requirements and other customary requirements for similar revolving credit facilities, including covenants related to: (A) limitations on the incurrence of additional indebtedness and liens, (B) limitations on certain investments, (C) limitations on certain asset transfers and restricted payments, (D) maintaining a certain minimum stockholders’ equity, (E) maintaining a ratio of total assets (less total liabilities) to total indebtedness, of the Company and its subsidiaries (subject to certain exceptions), of not less than 1.50 to 1.00, (F) maintaining a ratio of consolidated EBITDA to consolidated interest expense, of the Company and its subsidiaries (subject to certain exceptions), of not less than 2.25 to 1.00, (G) maintaining a minimum liquidity and net worth, and (H) limitations on the creation or existence of agreements that prohibit liens on certain properties of the Company and certain of its subsidiaries. The Syndicated Facility also includes usual and customary default provisions such as the failure to make timely payments under the facility, the occurrence of a change in control, and the failure by the Company to materially perform under the agreements governing the facility, which, if not complied with, could accelerate repayment under the facility. As of December 31, 2022, the Company was in compliance with all financial covenants under the Syndicated Facility. In addition to the asset coverage ratio described above, borrowings under the Syndicated Facility (and the incurrence of certain other permitted debt) are subject to compliance with a borrowing base that will apply different advance rates to different types of assets in the Company’s portfolio. Each loan or letter of credit originated or assumed under the Syndicated Facility is subject to the satisfaction of certain conditions.

As of December 31, 2022 and September 30, 2022, the Company had $695.0 million and $540.0 million of borrowings outstanding under the Syndicated Facility, respectively, which had a fair value of $695.0 million and $540.0 million, respectively. The Company's borrowings under the Syndicated Facility bore interest at a weighted average interest rate of 5.849% and 2.174% for the three months ended December 31, 2022 and 2021, respectively. For the three months ended

December 31, 2022 and 2021, the Company recorded interest expense (inclusive of fees) of $10.0 million and $3.8 million, respectively, related to the Syndicated Facility.

Citibank Facility

On March 19, 2021, the Company became party to a revolving credit facility (as amended and/or restated from time to time, the “Citibank Facility”) with OCSL Senior Funding II LLC (formerly OCSI Senior Funding II LLC), the Company’s wholly-owned, special purpose financing subsidiary, as the borrower, the Company, as collateral manager and seller, each of the lenders from time to time party thereto, Citibank, N.A., as administrative agent, and Wells Fargo Bank, National Association, as collateral agent and custodian.

As of December 31, 2022, the Company was able to borrow up to $200 million under the Citibank Facility (subject to borrowing base and other limitations). As of December 31, 2022, the reinvestment period under the Citibank Facility was scheduled to expire on November 18, 2023 and the maturity date for the Citibank Facility was November 18, 2024.

As of December 31, 2022, borrowings under the Citibank Facility are subject to certain customary advance rates and accrue interest at a rate equal to LIBOR plus between 1.25% and 2.20% per annum on broadly syndicated loans, subject to observable market depth and pricing, and LIBOR plus 2.25% per annum on all other eligible loans during the reinvestment period. In addition, as of December 31, 2022, for the duration of the reinvestment period there is a non-usage fee payable of 0.50% per annum on the undrawn amount under the Citibank Facility. The minimum asset coverage ratio applicable to the Company under the Citibank Facility is 150% as determined in accordance with the requirements of the Investment Company Act. Borrowings under the Citibank Facility are secured by all of the assets of OCSL Senior Funding II LLC and all of the Company’s equity interests in OCSL Senior Funding II LLC. The Company may use the Citibank Facility to fund a portion of its loan origination activities and for general corporate purposes. Each loan origination under the Citibank Facility is subject to the satisfaction of certain conditions.

As of December 31, 2022 and September 30, 2022, the Company had $165.0 million and $160.0 million outstanding under the Citibank Facility, respectively, which had a fair value of $165.0 million and $160.0 million, respectively. The Company's borrowings under the Citibank Facility bore interest at a weighted average interest rate of 6.508% and 1.830% for the three months ended December 31, 2022 and 2021, respectively. For the three months ended December 31, 2022 and 2021, the Company recorded interest expense (inclusive of fees) of $2.7 million and $0.8 million, respectively, related to the Citibank Facility.

2025 Notes

On February 25, 2020, the Company issued $300.0 million in aggregate principal amount of the 2025 Notes for net proceeds of $293.8 million after deducting OID of $2.5 million, underwriting commissions and discounts of $3.0 million and offering costs of $0.7 million. The OID on the 2025 Notes is amortized based on the effective interest method over the term of the 2025 Notes.

The 2025 Notes were issued pursuant to an indenture, dated April 30, 2012, as supplemented by the fifth supplemental indenture, dated February 25, 2020 (collectively, the "2025 Notes Indenture"), between the Company and Deutsche Bank Trust Company Americas (the "Trustee"). The 2025 Notes are the Company's general unsecured obligations that rank senior in right of payment to all of the Company's existing and future indebtedness that is expressly subordinated in right of payment to the 2025 Notes. The 2025 Notes rank equally in right of payment with all of the Company's existing and future liabilities that are not so subordinated. The 2025 Notes effectively rank junior to any of the Company's secured indebtedness (including unsecured indebtedness that the Company later secures) to the extent of the value of the assets securing such indebtedness. The 2025 Notes rank structurally junior to all existing and future indebtedness (including trade payables) incurred by the Company's subsidiaries, financing vehicles or similar facilities.

Interest on the 2025 Notes is paid semi-annually on February 25 and August 25 at a rate of 3.500% per annum. The 2025 Notes mature on February 25, 2025 and may be redeemed in whole or in part at any time or from time to time at the Company's option prior to maturity at par plus a “make-whole” premium, if applicable. In addition, holders of the 2025 Notes can require the Company to repurchase the 2025 Notes at 100% of their principal amount upon the occurrence of certain change of control events as described in the 2025 Notes Indenture. The 2025 Notes were issued in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof. During the three months ended December 31, 2022, the Company did not repurchase any of the 2025 Notes in the open market.

The 2025 Notes Indenture contains certain covenants, including covenants requiring the Company's compliance with the asset coverage requirements set forth in 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 U.S. Securities and Exchange Commission ("SEC")), as well as covenants requiring the Company to provide financial information to

the holders of the 2025 Notes and the Trustee if the Company ceases to be subject to the reporting requirements of the Securities Exchange Act of 1934, as amended (the "Exchange Act"). These covenants are subject to limitations and exceptions that are described in the 2025 Notes Indenture.

2027 Notes

On May 18, 2021, the Company issued $350.0 million in aggregate principal amount of the 2027 Notes for net proceeds of $344.8 million after deducting OID of $1.0 million, underwriting commissions and discounts of $3.5 million and offering costs of $0.7 million. The OID on the 2027 Notes is amortized based on the effective interest method over the term of the 2027 Notes.

The 2027 Notes were issued pursuant to an indenture, dated April 30, 2012, as supplemented by the sixth supplemental indenture, dated May 18, 2021 (collectively, the "2027 Notes Indenture"), between the Company and the Trustee. The 2027 Notes are the Company's general unsecured obligations that rank senior in right of payment to all of the Company's existing and future indebtedness that is expressly subordinated in right of payment to the 2027 Notes. The 2027 Notes rank equally in right of payment with all of the Company's existing and future liabilities that are not so subordinated. The 2027 Notes effectively rank junior to any of the Company's secured indebtedness (including unsecured indebtedness that the Company later secures) to the extent of the value of the assets securing such indebtedness. The 2027 Notes rank structurally junior to all existing and future indebtedness (including trade payables) incurred by the Company's subsidiaries, financing vehicles or similar facilities.

Interest on the 2027 Notes is paid semi-annually on January 15 and July 15, beginning on January 15, 2022, at a rate of 2.700% per annum. The 2027 Notes mature on January 15, 2027 and may be redeemed in whole or in part at any time or from time to time at the Company's option prior to maturity at par plus a “make-whole” premium, if applicable. In addition, holders of the 2027 Notes can require the Company to repurchase the 2027 Notes at 100% of their principal amount upon the occurrence of certain change of control events as described in the 2027 Notes Indenture. The 2027 Notes were issued in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof. During the three months ended December 31, 2022, the Company did not repurchase any of the 2027 Notes in the open market.

The 2027 Notes Indenture contains certain covenants, including covenants requiring the Company's compliance with the asset coverage requirements set forth in 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), as well as covenants requiring the Company to provide financial information to the holders of the 2027 Notes and the Trustee if the Company ceases to be subject to the reporting requirements of the Exchange Act. These covenants are subject to limitations and exceptions that are described in the 2027 Notes Indenture.

In connection with the 2027 Notes, the Company entered into an interest rate swap to more closely align the interest rates of its liabilities 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 2.700% and pays a floating interest rate of the three-month LIBOR plus 1.658% on a notional amount of $350 million. The Company designated the interest rate swap as the hedging instrument in an effective hedge accounting relationship. See Note 12 for more information regarding the interest rate swap.

Capital Stock, Long-Term Debt, and Other Securities [Abstract]

Long Term Debt, Structuring [Text Block]

On November 30, 2017, the Company entered into a senior secured revolving credit facility (as amended and restated, the “Syndicated Facility”) pursuant to a Senior Secured Revolving Credit Agreement with the lenders party thereto, ING Capital LLC, as administrative agent, ING Capital LLC, JPMorgan Chase Bank, N.A., BofA Securities, Inc. and MUFG Union Bank, N.A., as joint lead arrangers and joint bookrunners, and JPMorgan Chase Bank, N.A. and Bank of America, N.A., as syndication agents. The Syndicated Facility provides that the Company may use the proceeds of the loans and issuances of letters of credit under the Syndicated Facility for general corporate purposes, including acquiring and funding leveraged loans, mezzanine loans, high-yield securities, convertible securities, preferred stock, common stock and other investments. The Syndicated Facility further allows the Company to request letters of credit from ING Capital LLC, as the issuing bank.

As of December 31, 2022, the size of the Syndicated Facility was $1.0 billion. In addition, pursuant to an "accordion" feature, the Company may increase the size of the facility to up to the greater of $1.25 billion and the Company's net worth, as defined in the facility, under certain circumstances.

As of December 31, 2022, (i) the period during which the Company may make drawings will expire on May 4, 2025 and the maturity date is May 4, 2026 and (ii) the interest rate margin for (a) LIBOR loans (which may be 1-, 2-, 3- or 6-month, at the Company’s option) was 2.00% and (b) alternate base rate loans was 1.00%.

The Syndicated Facility is secured by substantially all of the Company’s assets (excluding, among other things, investments held in and by certain subsidiaries of the Company (including OCSL Senior Funding II LLC) or investments in certain portfolio companies of the Company) and guaranteed by certain subsidiaries of the Company. As of December 31, 2022, except for assets that were held by OCSL Senior Funding II LLC and certain immaterial subsidiaries, substantially all of the Company's assets are pledged as collateral under the Syndicated Facility.

Long Term Debt, Title [Text Block]

Citibank Facility

Long Term Debt, Dividends and Covenants [Text Block]

As of December 31, 2022, borrowings under the Citibank Facility are subject to certain customary advance rates and accrue interest at a rate equal to LIBOR plus between 1.25% and 2.20% per annum on broadly syndicated loans, subject to observable market depth and pricing, and LIBOR plus 2.25% per annum on all other eligible loans during the reinvestment period. In addition, as of December 31, 2022, for the duration of the reinvestment period there is a non-usage fee payable of 0.50% per annum on the undrawn amount under the Citibank Facility. The minimum asset coverage ratio applicable to the Company under the Citibank Facility is 150% as determined in accordance with the requirements of the Investment Company Act. Borrowings under the Citibank Facility are secured by all of the assets of OCSL Senior Funding II LLC and all of the Company’s equity interests in OCSL Senior Funding II LLC. The Company may use the Citibank Facility to fund a portion of its loan origination activities and for general corporate purposes. Each loan origination under the Citibank Facility is subject to the satisfaction of certain conditions.

Capital Stock, Long-Term Debt, and Other Securities [Abstract]

Long Term Debt, Structuring [Text Block]

On February 25, 2020, the Company issued $300.0 million in aggregate principal amount of the 2025 Notes for net proceeds of $293.8 million after deducting OID of $2.5 million, underwriting commissions and discounts of $3.0 million and offering costs of $0.7 million. The OID on the 2025 Notes is amortized based on the effective interest method over the term of the 2025 Notes.

The 2025 Notes were issued pursuant to an indenture, dated April 30, 2012, as supplemented by the fifth supplemental indenture, dated February 25, 2020 (collectively, the "2025 Notes Indenture"), between the Company and Deutsche Bank Trust Company Americas (the "Trustee"). The 2025 Notes are the Company's general unsecured obligations that rank senior in right of payment to all of the Company's existing and future indebtedness that is expressly subordinated in right of payment to the 2025 Notes. The 2025 Notes rank equally in right of payment with all of the Company's existing and future liabilities that are not so subordinated. The 2025 Notes effectively rank junior to any of the Company's secured indebtedness (including unsecured indebtedness that the Company later secures) to the extent of the value of the assets securing such indebtedness. The 2025 Notes rank structurally junior to all existing and future indebtedness (including trade payables) incurred by the Company's subsidiaries, financing vehicles or similar facilities.

Interest on the 2025 Notes is paid semi-annually on February 25 and August 25 at a rate of 3.500% per annum. The 2025 Notes mature on February 25, 2025 and may be redeemed in whole or in part at any time or from time to time at the Company's option prior to maturity at par plus a “make-whole” premium, if applicable. In addition, holders of the 2025 Notes can require the Company to repurchase the 2025 Notes at 100% of their principal amount upon the occurrence of certain change of control events as described in the 2025 Notes Indenture. The 2025 Notes were issued in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof. During the three months ended December 31, 2022, the Company did not repurchase any of the 2025 Notes in the open market.

Long Term Debt, Title [Text Block]

2027 Notes

Long Term Debt, Dividends and Covenants [Text Block]

The 2027 Notes Indenture contains certain covenants, including covenants requiring the Company's compliance with the asset coverage requirements set forth in 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), as well as covenants requiring the Company to provide financial information to the holders of the 2027 Notes and the Trustee if the Company ceases to be subject to the reporting requirements of the Exchange Act. These covenants are subject to limitations and exceptions that are described in the 2027 Notes Indenture.