Top 25 Middle market private equity firms based in Boston, United States

“Founded in 1984, Bain Capital is one of the world’s leading private investment firms.”

“HarbourVest is an independent, global private markets firm with over 43 years of experience and $161 billion assets under management as of December 31, 2025.”

“Advent is a leading global private equity investor committed to working in partnership with management teams, entrepreneurs, and founders to help transform businesses.”

“TA is a leading global private equity firm focused on scaling growth in profitable companies.”

“PSG is a growth equity firm that partners with software and technology-enabled services companies to help them navigate transformational growth, capitalize on strategic…”

“Summit Partners is a global alternative investment firm with capital dedicated to growth equity, fixed income, and public equity opportunities.”

“Berkshire Partners is a 100% employee-owned, multi-sector specialist investor in private and public equity, with a focus on North American-based, middle-market companies.”

“Based in Boston and New York City, Charlesbank is a leading middle-market private investment firm with $21.5 billion in assets under management as of 3/31/2026.”

“Headquartered in Boston, with offices in San Francisco, New York, London and Hong Kong, Audax Private Equity is a leading private equity platform focused on investing across the…”

“THL Partners is a Boston-based private equity firm investing in middle-market growth companies in three industry groups: Financial Technology & Services, Healthcare, and…”

“Founded in 1998, Great Hill Partners is a private equity firm targeting investments of $100 million to $750 million in high-growth companies across the software, financial…”

“Founded in 1994, Spectrum Equity is a leading growth equity firm with offices in Boston, San Francisco, and London.”

“HighVista Strategies LLC is an employee-owned alternative asset manager that brings investors alpha opportunities in structurally inefficient markets.”

“BV Investment Partners is one of the oldest and most experienced sector-focused private equity firms in North America.”

“Parthenon Capital Partners (“Parthenon” or “Parthenon Capital”) is a private equity firm that partners with and invests in management teams and their companies.”

“Founded in 2015, Silversmith Capital Partners is a Boston-based growth equity firm with over $5 billion in capital under management.”

“Volition Capital is a growth equity firm established in 2010 that focuses on investing in high-growth, founder-owned technology businesses across the U.S.”

“BayPine is a private investment firm that seeks to create lasting value for the firm's investors, portfolio companies and communities in which they operate by driving innovation…”

“Cove Hill Partners is a private equity firm focused on partnering with outstanding management teams to build market-leading technology and consumer companies.”

“Founded in 1988, Ampersand is a middle-market private equity firm with $3 billion of assets under management dedicated to growth-oriented investments in the healthcare sector.”

“Copley Equity Partners is a private investment firm based in Boston, MA, and Denver, CO.”

“Founded in 1993, New Boston is a real estate investment management firm based in Boston, MA that manages over 1.2 billion dollars in private equity capital on behalf of high net…”