Bain Capital Specialty Finance, Inc. functions as a business development company (BDC) whose primary focus is providing direct debt solutions to companies in the middle market segment. The fund's investment mandate is broad, covering a spectrum of debt instruments. This includes various forms of secured senior debt, such as first-lien, stretch senior, and second-lien facilities. It also invests in hybrid financing structures like unitranche loans, as well as subordinated or junior capital, which encompasses mezzanine debt and other junior securities. Furthermore, the firm engages in the secondary acquisition of assets or portfolios, primarily comprising corporate debt from middle-market businesses. Generally, Bain Capital Specialty Finance targets companies that generate annual earnings before interest, taxes, depreciation, and amortization (EBITDA) between $10 million and $150 million.