Mainsail Partners
General contacts
Investor type
PE
Founded
2003
AUM
$4 000 M
Location
San Francisco, California, United States
Investor profile last updated: 21 July, 2025
Profile
Mainsail Partners is a growth equity firm that invests in bootstrapped B2B software companies to help them realize their full potential. Our team is purpose-built to include experienced investors and software operators who help founders build great teams, develop industry-leading products, design data-driven and scalable infrastructure, and grow market share. Mainsail’s hands-on support and best practices are delivered with a collaborative approach that respects founder-led cultures and helps build on each company’s commitment to its people and customers.
With offices in Austin and San Francisco, Mainsail Partners has raised nearly $4 billion in committed capital and partnered with 100+ companies over the last 22 years. For more information, visit www.mainsailpartners.com.
Don’t miss the latest Mainsail News & SaaS Growth Insights: Subscribe at: https://mainsailpartners.com/subscribe/.
Industry
Mainsail Partners Funds
| Name | Type |
|
|
|
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
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Title
Email
Social Networks
Investment-team contacts for Mainsail Partners — including verified work emails and LinkedIn profiles — are available to Private Equity List subscribers.
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Contacts sourced from the firm's website and LinkedIn, 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.
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 Education, Healthcare Services, Marketing and Advertising, Real Estate, SaaS, Security, Software, Transportation, HealthTech, Financial Services, Fintech, Business Services (B2B).
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 mainsail@mainsailpartners.com. 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.
Can I access Mainsail Partners data via API or MCP?
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 21 July, 2025. Something out of date here? Report it — we re-run that firm within 48h and get back to you.