Exhibit 99.1 Oaktree Specialty Lending Corporation Announces Second Fiscal Quarter 2026 Financial Results LOS ANGELES, CA, May 5, 2026 - Oaktree Specialty Lending Corporation (NASDAQ: OCSL) ("Oaktree Specialty Lending" or the "Company"), a specialty finance company, today announced its financial results for the second fiscal quarter ended March 31, 2026. Financial Highlights for the Quarter Ended March 31, 2026 1 See Non-GAAP Financial Measures below for a description of the non-GAAP measures and the reconc ...