Mainsail Partners

Mainsail Partners is a growth equity firm that invests in bootstrapped. See sector focus, stage focus and contact routes.

About Mainsail Partners

Mainsail Partners is a growth equity firm that invests in bootstrapped, founder-led B2B software and AI-enabled companies, typically targeting those with $4M–$25M in revenue and offering check sizes of $10M–$75M. The firm focuses on vertical SaaS, fintech, healthcare IT, infrastructure/security software, and select horizontal SaaS, with a distinctive thesis centered on high-touch, culture-first support to help these companies scale into market leaders. Notable portfolio companies include Apptega, Teamfront, and MirrorWeb, reflecting their concentration in enterprise applications and fintech.

Mainsail Partners at a glance

Location
San Francisco, CA, USA
Investor type
Venture Capital
Stages
Growth

Frequently asked about Mainsail Partners

What does Mainsail Partners invest in?
Mainsail Partners (San Francisco, CA, USA) — sector focus: Cybersecurity, Edtech, Fintech, Healthcare; stage focus: Growth.
How do I contact Mainsail Partners?
Mainsail Partners's published profile links (website, LinkedIn or X where available) are listed on the StartupFundraising.com investor profile.
Where is Mainsail Partners headquartered?
Mainsail Partners is based in San Francisco, CA, USA.

Every field above is read from the StartupFundraising firm directory — disclosed location, recorded investments and stated focus — and re-checked as filings arrive. Founders pair it with investors in San Francisco when building a target list.

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