Business Development Company (BDC): A BDC is often a non-diversified closed-end investment company, which is typically taxed as a regulated investment company (RIC) under Subchapter M of the Internal Revenue Code. A BDC typically makes investments in private companies in the form of debt (loans) or equity securities. It seeks to generate current income and/or capital gains in a tax-efficient manner. Much like mutual funds, BDCs are regulated similar entities but typically utilize leverage to generate excess returns.