Mainsail Partners

General contacts

Investor type

Founded

2003

AUM

$4 000 M

Location

San Francisco, California, United States

Investment Ticket

$10-50 m

Investment Stage

Series B Late Stage (Series C+)

Region of investment

North America Europe

Investor profile last updated: 16 August, 2026

Profile

Mainsail Partners is a growth equity firm based in the United States, specifically focusing on investments in B2B software and AI-enabled companies. The firm seeks to support bootstrapped founders and help them scale their businesses effectively by providing not only financial resources but also operational support to drive growth. Mainsail Partners operates with a dedicated team of professionals who have substantial experience in the technology sector.

The firm's investment focus includes sectors such as SaaS, Business Services (B2B), AI, HealthTech, and Software, with the aim of investing in mid to late-stage companies. Although specific details about their total assets under management or specific funding rounds are not provided, Mainsail Partners emphasizes a partnership approach to foster innovation and expansion.

Notable investments by Mainsail Partners include SmartMoving - a logistics software company, Inspect Point - a fire protection management platform, Nexus - a data connectivity platform, JobNimbus - construction home services software, ServiceCore - waste industry software solutions, and Fexa - a facilities management software company. These companies demonstrate Mainsail's strategic focus on AI and technology-driven businesses.

Industry

Business Services (B2B) Education Healthcare Services Marketing and Advertising SaaS Software AI HealthTech Financial Services Fintech

Mainsail Partners Funds

Name	Type	Industry	Stage	Region	Size	AUM	Launch date
Mainsail Partners V, L.P	Private Equity (PE)	Financial Services Fintech Healthcare Services SaaS Software	Series B Late Stage (Series C+)	North America	$5-10 m	$531 M	February 2020
Mainsail Partners VI, L.P	Private Equity (PE)	Business Services (B2B) Healthcare Services SaaS Software	Series B Late Stage (Series C+)	North America	$5-10 m	$915 M	April 2022

Contacts

Name

Title

Social Networks

Jason Frankel Partner

Partner

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Phil Stern Operating Principal

Operating Principal

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Investment-team contacts for Mainsail Partners — including verified work emails and LinkedIn profiles — are available to Private Equity List subscribers.
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FAQs about Mainsail Partners

Is Mainsail Partners a venture capital or private equity firm?

Mainsail Partners is a private equity firm. It backs companies at Series B and Late Stage (Series C+), writing tickets of $10-50 m.

Where is Mainsail Partners located?

Mainsail Partners is located in San Francisco, California, United States.

When was Mainsail Partners founded?

Mainsail Partners was founded in 2003.

What sectors and industries does Mainsail Partners invest in?

Mainsail Partners invests in companies and startups in Business Services (B2B), Education, Healthcare Services, Marketing and Advertising, SaaS, Software, AI, HealthTech, Financial Services, Fintech.

What is Mainsail Partners geographical focus of investments?

Mainsail Partners invests in companies and startups in North America, Europe.

At what stages of companies and startups does Mainsail Partners typically invest in?

Mainsail Partners invests in companies and startups at Series B, Late Stage (Series C+).

What is the usual amount of Mainsail Partners investment?

Mainsail Partners usually invests $10-50 m on average.

What is the amount of assets of under management (AUM) for Mainsail Partners?

Mainsail Partners has around $4 000m assets under management.

When was Mainsail Partners last fund created?

Mainsail Partners last fund was created/launched in 2022-04-19

What are the contacts of Mainsail Partners?

Mainsail Partners can be reached through its website mainsailpartners.com and its LinkedIn page. Its general enquiries address is [email protected]. Cold-mailing a general inbox rarely reaches a partner, so Private Equity List also lists the investment-team contacts for Mainsail Partners — names, roles, verified work emails and LinkedIn profiles — available on a Pro plan from $129/month (see pricing). Contacts are sourced from the firm's website and LinkedIn and re-verified on a rolling cycle. Spot a stale contact, or none at all? Report it — we re-run that firm within 48h and get back to you.

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Yes. Every field on this page — profile, funds, investment criteria, portfolio and investment-team contacts — is available programmatically through the Private Equity List REST API and MCP server, so AI assistants such as Claude and ChatGPT can query Mainsail Partners directly instead of scraping this page. One subscription covers both the web app and machine access — see API & MCP.

When was the Mainsail Partners profile last updated?

Private Equity List re-verifies investor profiles on a rolling cycle, pulling from the firm's own website and LinkedIn rather than a one-off import. This profile was last updated on 16 August, 2026. Something out of date here? Report it — we re-run that firm within 48h and get back to you.