Exhibit 99.1 Oaktree Specialty Lending Corporation Announces Second Fiscal Quarter 2024 Financial Results and Declares Quarterly Distribution of $0.55 Per Share Announces Permanent Management Fee Reduction LOS ANGELES, CA, April 30, 2024 - Oaktree Specialty Lending Corporation (NASDAQ: OCSL) (“Oaktree Specialty Lending” or the “Company”), a specialty finance company, today announced its financial results for the fiscal quarter ended March 31, 2024. Financial Highlights for the Quarter Ended March 31, 2024 • ...