Stony Brook Partners is a Boston-based holding company that acquires and builds lower middle market, service-oriented businesses in partnership with the owners and operators who lead them.

We are entrepreneurs first, investors second. We are drawn to companies that deliver services and products their customers genuinely value, create meaningful careers for their employees, and strengthen their local communities. We partner with the founders and owner-operators who are preparing to transition or scale, backing their teams with respect for what they have built and a commitment to keep building great, enduring companies.

The name Stony Brook comes from the underground river that once powered Boston's earliest industry — unseen, but constant, patient, and steadfast. We aspire to support our partners in much the same way, through obsessive customer focus, operational excellence, disciplined decision-making, and a horizon measured in decades. Most of all, we invest in their people, and in careers worth staying for.

If you are a founder or owner thinking about what comes next, we would welcome the chance to learn about your business and share more about ours. No pitch, no process, just a conversation between entrepreneurs.