Sixth Street Specialty Lending, Inc., formerly TPG Specialty Lending, Inc., is an externally managed, closed-end, non-diversified management investment company. The Company is a specialty finance company focused on lending to middle-market companies. It seeks to generate current income primarily in the United States-domiciled middle-market companies through direct originations of senior secured loans and originations of mezzanine and unsecured loans and investments in corporate bonds and equity securities. The Company invests in first-lien debt, second-lien debt, mezzanine and unsecured debt and equity and other investments. Its first-lien debt may include standalone first-lien loans; last out first-lien loans; unitranche loans and secured corporate bonds. Its second-lien debt may include secured loans and secured corporate bonds, with a secondary priority behind first-lien debt. The Company's investment advisor is Sixth Street Specialty Lending Advisers, LLC.