About Mainsail Partners
Mainsail Partners is a venture capital firm founded in 2003. It is primarily based out of San Francisco, United States. As of Dec 2025, Mainsail Partners is an active investor, having invested in 59 companies, with 4 new investments in the last 12 months. It primarily invests in Series B round in United States based startups. Its investments are spread across a wide range of sectors from Enterprise Applications to FinTech and Real Estate and Construction Tech. Most recently it participated in the $***** Series C round of Steelhead Technologies Overall, Mainsail Partners portfolio has seen 3 IPOs and 28 acquisitions including key companies like ServiceTitan, MACOM and Togo's Eateries. Mainsail Partners has team of 43 people including 7 partners.Key Metrics
Team Members
Portfolio Count
Portfolio Sectors
Portfolio Locations
Rounds of Entry
Series B, Series C & 5 more
Portfolio IPOs
Portfolio Soonicorns
Deals in last 12 months
Mainsail Partners' List of Top Investments
Mainsail Partners has a portfolio of 59 companies. Their most notable investments are in Red Oak Compliance and RentVine.Their portfolio spans across United States, Canada and United Kingdom. They have invested in Enterprise Applications, FinTech, Real Estate and Construction Tech, FinTech and 18 other sectors, across stages such as Series B, Series C and 5 more. Here is the list of top investments by Mainsail Partners:1. ServiceTitan
Developer of business management software for residential and commercial contractors. The platform provides tools for dispatching, scheduling, call booking, invoicing, and reporting to help trade contractors optimize operations. Additional features include artificial intelligence integration for field diagnostics, automated prospecting, and building load calculations. These digital resources assist companies in managing customer interactions, inventory, and sales pipelines through a centralized system.
Key facts about ServiceTitan
- Founded Year: 2007
- Location: Glendale (United States)
- Annual Revenue: $500M - $1B as on Jan 31, 2025
- Stage: Public
- Total Funding till date: $1.1B
- Employee Count: 3,049 as on Jan 31, 2025
- Investors: Sprout Capital Partners, Founders Circle Capital and 25 Others
- Latest Funding Round: Series G, Jun 30, 2021, $*****
- Highlight: Public
2. MACOM
Manufacturer of RF, microwave, millimeter wave, and optical networking components. The company provides amplifiers, attenuators, diodes, filters, integrated circuits, limiters, modules, photodetectors, and switches. Products support aerospace, broadcast video, CATV, data centers, industrial, medical, and telecommunications applications. The company also offers foundry and design services.
Key facts about MACOM
- Founded Year: 1950
- Location: Lowell (United States)
- Annual Revenue: $500M - $1B as on Sep 30, 2025
- Stage: Public
- Total Funding till date: $183M
- Employee Count: 2,213 as on Aug 31, 2026
- Investors: Gefinor Capital, White Hat Capital Partners and 12 Others
- Latest Funding Round: Grant (prize money), Jan 14, 2025, $*****
- Highlight: Public
3. Skimmer
Platform offering business management software for pool service. Its software features include customer profile management, order tracking and management, invoice and reports management, digital customer relationship management tools, staff tracking, and more.
Key facts about Skimmer
- Founded Year: 2014
- Location: Phoenix (United States)
- Stage: Series C
- Total Funding till date: $84M
- Employee Count: 113 as on Aug 31, 2026
- Investors: Mainsail Partners and unbundled vc
- Latest Funding Round: Series C, Oct 16, 2024, $*****
- Highlight: Editors' Pick
Fresh, made-to-order sandwiches and restaurant catering since 1971. We are committed to crafting delicious sandwiches using premium ingredients and generous portions. Our focus is on fresh meats, hand-scooped avocados, crisp produce, and soft bread. We prioritize our people, ensuring they love their jobs and provide excellent service. We are evolving with technology, offering online ordering, pickup, and delivery through our app. We value customer experience, providing rewards and easy access through login. We offer catering services and fundraising opportunities. We are dedicated to staying true to the sandwich while embracing innovation and customer satisfaction. We provide gift cards and career opportunities. Follow us on social media for updates.
Key facts about Togo's Eateries
- Founded Year: 1971
- Location: San Jose (United States)
- Stage: Acquired
- Employee Count: 269 as on Jul 31, 2026
- Investors: Mainsail Partners and Southfield Mezzanine
- Latest Funding Round: Conventional Debt, Jan 27, 2016, $*****
- Highlight: Acquired
5. Ncontracts
Provider of integrated software for governance, risk, and compliance management. The software offers tools for enterprise risk, vendor, and compliance management. It also includes features for business continuity, internal audit, and cybersecurity assessment. The platform provides solutions for banks, credit unions, mortgage lenders, and fintech companies.
Key facts about Ncontracts
- Founded Year: 2009
- Location: Nashville (United States)
- Stage: Acquired
- Total Funding till date: $250K
- Employee Count: 476 as on Aug 31, 2026
- Investors: Mainsail Partners, HgCapital Trust and 2 Others
- Latest Funding Round: Series A, May 12, 2015, $*****
- Highlight: Acquired
Mainsail Partners' Year-on-Year Investment Trends
Mainsail Partners has invested in 62 companies over the last 18 years, with an average of 4 new investments annually in the last 10 years. In 2025, it made 6 investments. Its most recent first time investment was in Steelhead Technologies and most recent follow-on round was in JobNimbus.Year | No. of Investments | ||
|---|---|---|---|
1st Round | Follow-on | Total | |
2026 (YTD) | 0 | 0 | 0 |
2025 | 6 | 0 | 6 |
2024 | 5 | 3 | 8 |
2023 | 3 | 0 | 3 |
2022 | 7 | 0 | 7 |
2021 | 3 | 0 | 3 |
2020 | 1 | 0 | 1 |
2019 | 3 | 0 | 3 |
2018 | 4 | 0 | 4 |
2017 | 4 | 0 | 4 |
Mainsail Partners' Investments by Stage
Mainsail Partners has made 12 investments in Series B stage with an average round size of $37M, 11 investments in Series C stage with an average round size of $49.9M and 10 investments in Series A stage with an average round size of $31.8M.Stage of entry | No. of Investments |
|---|---|
Series B | 12 |
Series C | 11 |
Series A | 10 |
PE | 5 |
Seed | 5 |
Others | 3 |
Note: We have considered here, only first round of investments
Mainsail Partners' Investments by Sector
Mainsail Partners has a diverse portfolio, with companies operating in the Enterprise Applications, Vertical SaaS, Real Estate and Construction Tech, HealthTech and FinTech. Notably, it has invested in 50 Enterprise (B2B) companies, 50 Tech companies, 39 Software companies and at least 38 companies focusing on Saas.Sector | No. of Investments |
|---|---|
Enterprise Applications | 42 |
Vertical SaaS | 22 |
Real Estate and Construction Tech | 8 |
HealthTech | 7 |
FinTech | 5 |
Others | 25 |
Note: We have considered here, only first round of investments
Mainsail Partners' Investments by Geography
Mainsail Partners has made most investments in United States (44), followed by Canada where it has made 1 investment.Country | No. of Investments |
|---|---|
United States | 44 |
Canada | 1 |
United Kingdom | 1 |
Note: We have considered here, only first round of investments
Mainsail Partners' recent investments
Mainsail Partners has not made any investment in 2026 so far.Here are the most recent investments by Mainsail Partners:
Filter this listDate | Company | Location | Round Details | Round Amount | Co-Investors |
|---|---|---|---|---|---|
Dec 11, 2025 | United States | Series C | 3827 | - | |
Oct 24, 2025 | United States | Series C | 8069 | - | |
Oct 23, 2025 | United States | Series C | 7139 | - | |
Oct 09, 2025 | United States | Series B | 9410 | - | |
May 02, 2025 | United States | Series A | 6114 | - |
IPOs and Publicly Listed companies in Mainsail Partners' Portfolio
3 of Mainsail Partners' portfolio companies have become public. ServiceTitan got listed on the National Association of Securities Dealers Automated Quotations (NASDAQ), in Dec 2024 at marketcap of $5.31B and Brilliant Earth got listed on the National Association of Securities Dealers Automated Quotations (NASDAQ) at marketcap of $1.14B.Here are Mainsail Partners' portfolio companies that went public:
Company | IPO Date | First Invested on | First Round of Investment | Round Size |
|---|---|---|---|---|
Dec 12, 2024 | - | - | 6765 | |
Sep 23, 2021 | - | - | 2454 | |
Mar 15, 2012 | - | - | 2879 |
Acquired companies in Mainsail Partners' Portfolio
28 companies from Mainsail Partners' portfolio have been acquired. The most recent acquisition was Extensiv in Sep 2026 by Descartes for $*****.Here are Mainsail Partners' portfolio companies that got acquired most recently:
Company | Acquisition Date | First Invested on | First Round of Investment | Round Size |
|---|---|---|---|---|
Sep 01, 2026 | Dec 03, 2015 | Series B | 6504 | |
Oct 16, 2025 | Oct 24, 2017 | Series B | 6753 | |
Aug 08, 2025 | Nov 06, 2019 | Seed | 1026 | |
Sep 04, 2024 | May 12, 2015 | Series A | 9939 | |
Feb 16, 2023 | Jan 09, 2017 | Series B | 8237 |
Team profile of Mainsail Partners
Mainsail Partners has a team of 43 members including 7 Partners and 18 Principals located in United States. Mainsail Partners' team does not sit on the board of any company as of now.Here is a list of top team members in Mainsail Partners:
Name | Designation | Location | Board Memberships | Contact Details |
|---|---|---|---|---|
Partner | Austin | - | - | |
Partner | San Francisco | - | - | |
Partner | San Francisco | - | - | |
Partner | Austin | - | - | |
Partner | San Francisco | - | - | |
Partner | San Francisco | - | - | |
Partner | Austin | - | - | |
Principal | San Francisco | - | - | |
Principal | Austin | - | - | |
Principal | San Francisco | - | - | |
Principal | San Francisco | - | - |
Co-investors of Mainsail Partners
Over the past 18 years, 26 investors have co-invested in Mainsail Partners's portfolio companies. This includes only funds.
- Invested before Mainsail Partners: unbundled vc, Innovius Capital and 17 others have invested in rounds before Mainsail Partners. There is 1 company where unbundled vc has invested before Mainsail Partners and 1 company where Innovius Capital has invested before Mainsail Partners.
- Invested after Mainsail Partners: A total of 7 investors have invested in Mainsail Partners's portfolio after their investments. Top Investors include Sumeru Equity Partners (1 company), JMI Management (1 company) and Hg (1 company).
Recent News related to Mainsail Partners
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FieldFlo Secures $35 Million Growth Investment from Mainsail PartnersBusiness Wire•Oct 24, 2025•FieldFlo, Mainsail Partners, Mainsail
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Flyntlok Secures $36 Million Growth Investment from Mainsail PartnersBusiness Wire•Oct 09, 2025•Flyntlok, Mainsail Partners
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Trent Broberg Succeeds Patrick McKittrick as Fullbay CEOAftermarket Matters•Sep 24, 2025•Fullbay, Wabash, ACERTUS, JMI Management and 3 others
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Mainsail Partners is raising a $1.4B growth equity fund to invest in startupsThe Business Journals•Mar 26, 2025•Mainsail Partners
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Inn-Flow Secures $45 Million Growth Investment from Mainsail PartnersGlobal Fintech Series•Mar 18, 2025•Inn-Flow, Mainsail Partners
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Triangle hotel-software firm Inn-Flow raises $45MBusiness North Carolina•Mar 17, 2025•Inn-Flow, Mainsail Partners
