Oaktree Specialty Lending Corporation (NASDAQ: OCSL) is a specialty finance company that provides customized, one-stop credit solutions to middle-market companies with limited access to public or syndicated capital markets. The company offers a range of financing products including first lien loans (such as unitranche and last out first lien loans), second lien loans, unsecured and mezzanine loans, bonds, preferred equity, and certain equity co-investments; it primarily invests in companies across diverse industries like software and services, healthcare, business services, and consumer services that exhibit resilient business models and strong fundamentals. Oaktree Specialty Lending operates as a business development company (BDC) regulated under the Investment Company Act of 1940 and is externally managed by Oaktree Fund Advisors, LLC, an affiliate of Oaktree Capital Management, L.P., a global leader in credit strategies with $218 billion in assets under management as of September 30, 2025.
Founded in 2008 as the predecessor Fifth Street Finance Corp. and renamed Oaktree Specialty Lending Corporation following Oaktree's appointment as investment adviser in October 2017, the company is headquartered in Los Angeles, California. It targets U.S. middle-market companies, typically those with EBITDA between $20 million and $150 million, originating loans with terms of 3-7 years and floating interest rates; its portfolio emphasizes first lien senior secured loans, which comprised approximately 74% by fair value at fiscal year-end 2024 (September 30), alongside second lien and subordinated debt for downside protection and attractive yields averaging around 12.3%.
Recent developments include a strategic merger with Oaktree Strategic Income Corporation (OCSI) in March 2021, which enhanced scale, portfolio diversification, and operational efficiencies with significantly increased total assets; ongoing portfolio repositioning since 2018 toward directly originated senior secured loans to upper middle-market companies; and maintenance of strong credit quality through 2024-2025 amid higher interest rates, with total investments at fair value of approximately $3.1 billion as of September 30, 2024, non-accrual loans at 0.9%, and net asset value per share at $19.65. The company continues to leverage Oaktree's extensive sponsor relationships—over 200 developed since 2017, with 81% of sponsor-backed deals from repeat partners—and participates in joint ventures such as the Glick JV for senior secured loans to middle-market companies, funding approximately $84.0 million in commitments as of September 30, 2025.