Stony Brook Partners acquires small businesses with big legacies.
A Boston-based holding company partnering with founders and owner-operators to build exceptional, enduring companies.
Start a conversationWho 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.
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.
Our name comes from the underground river that once powered Boston’s earliest industry: unseen, but constant, patient and steadfast. We aim to support our partners the same way, with customer focus, operational discipline and a commitment to the people who built the business.
If you are thinking about what comes next, we would welcome a conversation. No pitch, no process, just two entrepreneurs talking.
James Whitaker
Daniel Reyes
Who we partner with
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, we look for essential local service businesses.
- Established, profitable service businesses
- Loyal customers and repeat or recurring demand
- A strong local reputation and an experienced team
- Owners planning retirement, succession or growth
Restaurants & hospitality 
HVAC & home services 
Automotive services 
Logistics & distribution 
Pet care 
Industrial & field services
What owners say
“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.