# Riff funding: rounds and investors > Riff has raised $19M across 3 rounds since 2021. Investors include Y Combinator, Global Founders Capital and Northzone. Every round with its source. Source: https://millionrounds.com/company/riff (Millionrounds; every figure on the page links to its filing or article) United States · [Series A startup](https://millionrounds.com/companies) # Who invested in *Riff* 3 rounds we have observed, with the 4 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. Cleantech Funding summary Updated 26 Oct 2026 **$19M** raised across 3 rounds since 2021, from 3 sources **$2.5M** Seed **$500K** Pre-seed **$16M** Series A - **Latest round:** Series A, $16M Oct 2025 - **Step-up i:** 32.4× - **Investors:** 4 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. 2022 2023 2024 2025 **$2.5M** Seed **$500K** Pre-seed **$16M** Series A - **First round:** Seed, $2.5M - **Biggest round:** $16M - **Between rounds:** 3.8 years ## The rounds - **Oct 2025** Series A **$16M** *3 new* [Global Founders Capital](https://millionrounds.com/fund/global-founders-capital) [Northzone](https://millionrounds.com/fund/northzone) [CapitalOven](https://millionrounds.com/fund/capitaloven) Source recorded - **Sept 2025** Pre-seed **$500K** *1 new* [Y Combinator](https://millionrounds.com/fund/y-combinator) Source recorded - **Nov 2021** Seed **$2.5M** No investor was named in the report. 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. **Seed** 2021 **Pre-seed** 2025 **Series A** 2025 [Y Combinator](https://millionrounds.com/fund/y-combinator) [Global Founders Capital](https://millionrounds.com/fund/global-founders-capital) [Northzone](https://millionrounds.com/fund/northzone) [CapitalOven](https://millionrounds.com/fund/capitaloven) ## Everyone who backed them [Y Combinator](https://millionrounds.com/fund/y-combinator) Accelerator **1** round [Global Founders Capital](https://millionrounds.com/fund/global-founders-capital) VC firm **1** round [Northzone](https://millionrounds.com/fund/northzone) VC firm **1** round [CapitalOven](https://millionrounds.com/fund/capitaloven) VC firm **1** round Missing a round, or an investor who was in one? [Tell us](https://millionrounds.com/corrections?slug=riff). ## Also claim to have backed them This firm lists Riff as a portfolio company on their own website, but no report of a round names it. They are the firms' own claims, kept apart from the rounds above. [Sondo Capital](https://millionrounds.com/fund/sondo-capital) VC firm Per its own site ## Quick answers about Riff ### Who invested in Riff? Riff's investors include Y Combinator, Global Founders Capital, Northzone and CapitalOven. ### How much has Riff raised? Riff has raised $19M across 3 rounds since 2021. ### When did Riff last raise? Riff's most recent round was a Series A of $16M in Oct 2025. ### What was Riff's biggest round? Its most recent round, $16M in Oct 2025, is also its largest on record. ### Who backed Riff first? Riff's first round on record, in Sept 2025, was backed by Y Combinator. ### What stage is Riff at? Riff's latest named round is a Series A, in Oct 2025. ### Where is Riff based? Riff is based in the United States. ## Companies like Riff In the same sector, and raised in the last eighteen months. [**Amogy** $125M · Oct 2026](https://millionrounds.com/company/amogy)[**LanzaJet** $67M · Oct 2026](https://millionrounds.com/company/lanzajet)[**Pivot Energy** $500M · Oct 2026](https://millionrounds.com/company/pivot-energy)[**Peak Energy** $163M · Oct 2026](https://millionrounds.com/company/peak-energy)[**Renew** $207M · Oct 2026](https://millionrounds.com/company/renew)[**Optivolt** $37M · Oct 2026](https://millionrounds.com/company/optivolt) ## 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