Todd Rainville

Todd Rainville is the co-founder and Managing Partner of Great River Capital Partners (GRCP), a Boston-based private equity firm he launched in 2020 with a narrow mandate: "acquiring mid-sized industrial technology and services companies. That is all we do." The firm partners with business owners to build long-term value through a combination of organic growth and strategic add-on acquisitions, drawing on what it describes as roughly 30 years of collective investing experience in the sector.

Before founding GRCP, Rainville was a Partner and member of the Investment Committee at JMC Capital Partners, which he joined in February 2017 to lead the firm's Business Development Team — identifying uniquely positioned industrial companies, building relationships with founders and owners, and structuring deals. His earlier career spans roughly 20 years of private equity and finance: he was a partner at Symmetric Capital, and spent nearly a decade combined across Summit Partners (where he began in the late 1990s) and Ampersand Capital Partners. His work has covered expansion financings, recapitalizations, and leveraged buyouts, concentrated in the industrial and technology sectors.

Rainville holds a Bachelor of Arts, magna cum laude, in Economics from Bates College and an MBA from Harvard Business School. Beyond his institutional PE work, he is an active angel investor and serves on the Steering Committee of the Cherrystone Angel Group, Rhode Island's first organized angel investment group (founded 2004, 60+ members). The "Angel Investors / Seed Round" classification reflects this personal early-stage investing rather than GRCP's buyout strategy.

• Institutional (GRCP): Disciplined, single-thesis private equity — "a private equity investment firm with a narrow focus on acquiring mid-sized industrial technology and services companies." Value creation comes from organic growth plus complementary add-on acquisitions, in partnership with existing owners and management.
• Deal types: Traditional expansion financings, recapitalizations, and leveraged buyouts — structures that let founders/owners take some chips off the table while staying involved.
• Sector conviction: Deep specialization in industrial manufacturing, industrial technology, and services; this is where his track record and board experience are concentrated.
• Angel investing: Personally backs early/seed-stage companies, spanning medical devices and diagnostics, robotics, agtech, electronics, and software — often New England–based and frequently sourced through angel networks (Cherrystone Angel Group; co-investments alongside groups like Boston Harbor Angels).
• What makes him say yes: A strong founder/owner relationship and a credible path to long-term value creation; he is described as someone who cultivates founder relationships and structures creative deals rather than chasing pure financial engineering.