# Mainstay funding: rounds and investors > Mainstay has raised $18M across 2 rounds since 2022. Investors include Alumni Ventures, Khosla Ventures and FJ Labs. Every round with its source. Source: https://millionrounds.com/company/mainstay (Millionrounds; every figure on the page links to its filing or article) United States · [Venture startup](https://millionrounds.com/companies) # Who invested in *Mainstay* 2 rounds we have observed, with the 9 investors named in them. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it. AI Raised 2 months ago Funding summary Updated 26 Oct 2026 **$18M** raised across 2 rounds since 2022, from 2 sources - **Latest round:** Venture, $18M Sept 2026 - **Investors:** 9 See who backed them ## The funding story Each circle is a round, placed by date and sized by amount. The line above is the running total. 2023 2024 2025 2026 **?** Venture **$18M** Venture - **First round:** Venture - **Biggest round:** $18M - **Between rounds:** 4 years ## The rounds - **Sept 2026** Venture **$18M** *4 new* [Khosla Ventures](https://millionrounds.com/fund/khosla-ventures) [FJ Labs](https://millionrounds.com/fund/fj-labs) [Clocktower Ventures](https://millionrounds.com/fund/clocktower-ventures) [Alpaca VC](https://millionrounds.com/fund/alpaca-vc) Source recorded - **Sept 2022** Venture **Amount undisclosed** *5 new* [Alumni Ventures](https://millionrounds.com/fund/us-strategic-tech-fund-an-alumni-ventures-fund) [Right Side Capital Management](https://millionrounds.com/fund/right-side-capital-management) [Salesforce Ventures](https://millionrounds.com/fund/salesforce-ventures) [Reach](https://millionrounds.com/fund/reach) [Relay Ventures](https://millionrounds.com/fund/relay-ventures) Source recorded ## Who was in which round The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led. **Venture** 2022 **Venture** 2026 [Alumni Ventures](https://millionrounds.com/fund/us-strategic-tech-fund-an-alumni-ventures-fund) [Khosla Ventures](https://millionrounds.com/fund/khosla-ventures) [FJ Labs](https://millionrounds.com/fund/fj-labs) [Right Side Capital Management](https://millionrounds.com/fund/right-side-capital-management) [Salesforce Ventures](https://millionrounds.com/fund/salesforce-ventures) [Reach](https://millionrounds.com/fund/reach) [Clocktower Ventures](https://millionrounds.com/fund/clocktower-ventures) [Relay Ventures](https://millionrounds.com/fund/relay-ventures) [Alpaca VC](https://millionrounds.com/fund/alpaca-vc) ## Everyone who backed them [Alumni Ventures](https://millionrounds.com/fund/us-strategic-tech-fund-an-alumni-ventures-fund) VC firm **1** round [Khosla Ventures](https://millionrounds.com/fund/khosla-ventures) VC firm **1** round [FJ Labs](https://millionrounds.com/fund/fj-labs) VC firm **1** round [Right Side Capital Management](https://millionrounds.com/fund/right-side-capital-management) VC firm **1** round [Salesforce Ventures](https://millionrounds.com/fund/salesforce-ventures) Corporate VC **1** round [Reach](https://millionrounds.com/fund/reach) VC firm **1** round [Clocktower Ventures](https://millionrounds.com/fund/clocktower-ventures) VC firm **1** round [Relay Ventures](https://millionrounds.com/fund/relay-ventures) VC firm **1** round [Alpaca VC](https://millionrounds.com/fund/alpaca-vc) VC firm **1** round Missing a round, or an investor who was in one? [Tell us](https://millionrounds.com/corrections?slug=mainstay). ## Quick answers about Mainstay ### Who invested in Mainstay? Mainstay's investors include Alumni Ventures, Khosla Ventures, FJ Labs, Right Side Capital Management and Salesforce Ventures, and 4 more on record. ### How much has Mainstay raised? Mainstay has raised $18M across 2 rounds since 2022. One round did not disclose an amount, so the total is a floor. ### When did Mainstay last raise? Mainstay's most recent round was a Venture of $18M in Sept 2026. ### What was Mainstay's biggest round? Its most recent round, $18M in Sept 2026, is also its largest on record. ### Who backed Mainstay first? Mainstay's first round on record, in Sept 2022, was backed by Alumni Ventures, Right Side Capital Management and Salesforce Ventures and 2 others. ### What stage is Mainstay at? Mainstay's latest named round is a Venture, in Sept 2026. ### Where is Mainstay based? Mainstay is based in the United States. ## Companies like Mainstay In the same sector, and raised in the last eighteen months. [**SpaceX** $42B · Oct 2026](https://millionrounds.com/company/spacex)[**xPay** $1.5M · Oct 2026](https://millionrounds.com/company/xpay)[**Albert Invent** $20M · Oct 2026](https://millionrounds.com/company/albert-invent)[**FORT Robotics** $39M · Oct 2026](https://millionrounds.com/company/fort-robotics)[**Pika** $216M · Oct 2026](https://millionrounds.com/company/pika)[**Vertical Semiconductor** $84M · Oct 2026](https://millionrounds.com/company/vertical-semiconductor) ## Find investors like these Search every investor by what they have actually funded, then narrow to your stage and market. Free. Open the investor searchOr these rounds in the app