Goldman Sachs BDC, Inc. is a closed-end management investment company. The Company is a specialty finance company, which is focused on lending to middle-market companies. The Company's investment objective is to generate current income and, to a lesser extent, capital appreciation primarily through direct originations of secured debt, including first lien, including first lien, unitranche, including last out portions of such loans, and second lien debt, and unsecured debt, including mezzanine debt, as well as through select equity investments. The Company invests primarily in the United States middle-market companies. The Company invests in illiquid securities, including debt and equity investments, of middle-market companies. As of December 31, 2016, its portfolio included first lien/senior secured debt, first lien/last-out unitranche, second lien/senior secured debt, unsecured debt, preferred stock, common stock, and investment funds and vehicles.