Small businesses. Big legacies.
Stony Brook Partners acquires and builds enduring companies alongside the founders and owner-operators who made them.
Who we are
Entrepreneurs first, investors second. Based in Boston.
What we buy
Established, service-oriented businesses in the lower middle market.
Who we work with
Founders and owner-operators preparing to transition or scale.
How long we hold
Long-term. Our horizon is measured in decades, not exit dates.
A steady partner for the businesses you’ve built.
Entrepreneurs first, investors second.
Stony Brook Partners acquires and builds lower middle market, service-oriented businesses in partnership with the owners and operators who lead them. We back companies that customers genuinely value, that create meaningful careers, and that strengthen their communities.
If you are thinking about what comes next, we would welcome a conversation. No pitch, no process, just two entrepreneurs talking.
Unseen, but constant.
Patient and steadfast.
Stony Brook is the underground river that once powered Boston’s earliest industry. We aim to support our partners the same way: with customer focus, operational discipline and a commitment to the people who built the business.
Two operators,
one long view.
You will deal with us directly, from the first conversation through every year we own the business.
Essential local service businesses.
Owners who care what happens to their team and customers after they step back, and who want a buyer that will keep building on what they started. From restaurants to landscaping.
- 01Established, profitable service businesses
- 02Loyal customers and repeat or recurring demand
- 03A strong local reputation and an experienced team
- 04Owners planning retirement, succession or growth
Restaurants & hospitality 
HVAC & home services 
Automotive services 
Logistics & distribution 
Pet care 
Industrial & field services
“They took the time to understand how we run things before suggesting a single change. My team felt respected from day one.”
“Selling the business I spent thirty years building was personal. Stony Brook treated it that way, and kept every promise they made.”
“Straightforward, patient and honest. It felt like talking to fellow operators, not a finance firm.”
Let’s talk.
If you are a founder or owner thinking about what comes next, leave your name and the best way to reach you. One of us will be in touch personally.