Mainsail Partners is a growth equity firm that invests in bootstrapped, founder-led business-to-business software and AI-enabled companies. The firm partners with founders seeking capital and practical support to scale their businesses and build market-leading companies, with a focus on the opportunities and challenges unique to bootstrapped growth. Mainsail’s purpose-built Growth Team offers experience across areas including product, sales, talent, and artificial intelligence, and works collaboratively with portfolio companies.

Its support includes helping businesses recruit and develop talent, strengthen operations, and pursue growth while preserving the culture and values that founders have established. Mainsail also operates AI Labs, sharing resources and insights on applying AI in software businesses, and fosters a community for founders and leaders. Its portfolio includes companies serving sectors such as machine shops, commercial landscaping, property management, fire inspection, and veterinary practice management.

Through its website, Mainsail shares portfolio news, case studies, podcasts, and growth insights. The firm has offices in Austin and San Francisco and describes its approach as founder-friendly, experienced, and focused on long-term company development