Brookside Mezzanine Partners

Brookside Mezzanine Partners was a U.S.-based lower middle-market investment firm focused on providing subordinated debt, minority equity, junior capital, and unitranche financing to small and mid-sized companies. The firm invested in both sponsored and non-sponsored transactions to support buyouts, recapitalizations, strategic acquisitions, dividends, and growth capital needs. It was not an operating biotech, pharma, or healthcare company, though it invested across multiple sectors including healthcare services. Around 2020, the firm rebranded to Brookside Capital Partners to reflect a broader capital solutions strategy while maintaining the same investment focus and team continuity. As such, the requested name refers to a financial sponsor rather than a life sciences developer or healthcare operator.