Sixth Street Specialty Lending, Inc. is a specialty finance company focused on lending to middle-market companies. The Company seeks to generate current income primarily in United States domiciled middle-market companies through direct originations of senior secured loans and, to a lesser extent, originations of mezzanine loans and investments in corporate bonds, equity securities and other instruments. It invests in first-lien debt, second-lien debt, mezzanine and unsecured debt and equity and other investments. Its first-lien debt may include stand-alone first-lien loans; last out first-lien loans, which are loans that have a secondary priority behind super-senior first out first-lien loans; unitranche loans, which are loans that combine features of first-lien, second-lien and mezzanine debt, generally in a first-lien position, and secured corporate bonds with similar features to these categories of first-lien loans. It is managed by Sixth Street Specialty Lending Advisers, LLC.