# LiquidPiston funding: rounds and investors > LiquidPiston has raised $22M across 6 rounds since 2007. Investors include Adams Capital Management and Northwater Capital. Every round with its source. Source: https://millionrounds.com/company/liquidpiston (Millionrounds; every figure on the page links to its filing or article) United States · [Series C startup](https://millionrounds.com/companies) # Who invested in *LiquidPiston* 6 rounds we have observed, with the 2 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. Automotive & EVs Raised 7 months ago Funding summary Updated 26 Oct 2026 **$22M** raised across 6 rounds since 2007, from 6 sources **$1.8M** Series A **$6.5M** Growth **$5.0M** Series B **$1.5M** Series B **$6.5M** Series C **$500K** Round - **Latest round:** Round, $500K Mar 2026 - **Biggest round:** $6.5M Series C · Jul 2013 - **Investors:** 2 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. 2007 2010 2013 2016 2019 2022 2025 **$1.8M** Series A **$6.5M** Growth **$5.0M** Series B **$6.5M** Series C **$500K** Round - **First round:** Series A, $1.8M - **Biggest round:** $6.5M - **Usual gap between rounds:** 3.5 years ## The rounds - **Mar 2026** Round **$500K** No investor was named in the report. Filed with the SEC (Form D); no report of this raise yet SEC filing: $500K sold, first sale Mar 2026 - **Jul 2013** Series C **$6.5M** *2 returning* [Adams Capital Management](https://millionrounds.com/fund/adams-capital-management) [Northwater Capital](https://millionrounds.com/fund/northwater-capital) Reported by finsmes.com SEC filing: $2.3M sold, first sale Jun 2013 - **Dec 2011** Series B **$1.5M** No investor was named in the report. Reported by masshightech.com SEC filing: $6.5M sold, first sale Jan 2011 - **Jan 2011** Series B **$5.0M** *1 new* *1 returning* [Adams Capital Management](https://millionrounds.com/fund/adams-capital-management) [Northwater Capital](https://millionrounds.com/fund/northwater-capital) Reported by finsmes.com SEC filing: $2.2M sold, first sale Jan 2011 - **Jan 2011** Growth **$6.5M** No investor was named in the report. Reported by sec.gov SEC filing: $2.2M sold, first sale Jan 2011 - **Jul 2007** Series A **$1.8M** *1 new* [Adams Capital Management](https://millionrounds.com/fund/adams-capital-management) Reported by deals.venturebeat.com ## Funding filed with regulators LiquidPiston filed 4 raises, $7.9M in all. Filings say how much was sold and to how many investors; they never name the investors. - Dec 2024 **$4.9M** common stock of $5.0M offered Crowdfunding - Apr 2020 **$1.1M** common stock of $1.1M offered Crowdfunding - Dec 2019 **$1000K** other of $1.0M offered Crowdfunding - Dec 2019 **$888K** other of $1.1M offered Crowdfunding ## 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. **Series A** 2007 **Growth** 2011 **Series B** 2011 **Series B** 2011 **Series C** 2013 **Round** 2026 [Adams Capital Management](https://millionrounds.com/fund/adams-capital-management) [Northwater Capital](https://millionrounds.com/fund/northwater-capital) ## Everyone who backed them [Adams Capital Management](https://millionrounds.com/fund/adams-capital-management) VC firm **3** rounds [Northwater Capital](https://millionrounds.com/fund/northwater-capital) VC firm **2** rounds Missing a round, or an investor who was in one? [Tell us](https://millionrounds.com/corrections?slug=liquidpiston). ## Also claim to have backed them These 2 firms list LiquidPiston as a portfolio company on their own websites, but no report of a round names them. They are the firms' own claims, kept apart from the rounds above. [Colle Capital Partners](https://millionrounds.com/fund/colle-capital) VC firm Per its own site [Yasar Corporation](https://millionrounds.com/fund/yasar-corporation) VC firm Per its own site ## Quick answers about LiquidPiston ### Who invested in LiquidPiston? LiquidPiston's investors include Adams Capital Management and Northwater Capital. ### How much has LiquidPiston raised? LiquidPiston has raised $22M across 6 rounds since 2007. ### When did LiquidPiston last raise? LiquidPiston's most recent round, $500K, was in Mar 2026. ### What was LiquidPiston's biggest round? LiquidPiston's largest round on record is $6.5M (Series C), in Jul 2013. ### Who backed LiquidPiston first? LiquidPiston's first round on record, in Jul 2007, was backed by Adams Capital Management. ### What stage is LiquidPiston at? LiquidPiston's latest named round is a Series C, in Jul 2013. ### Where is LiquidPiston based? LiquidPiston is based in the United States. ## Companies like LiquidPiston In the same sector, and raised in the last eighteen months. [**Applied Intuition** $640M · Oct 2026](https://millionrounds.com/company/applied-intuition)[**American Metal** $1.7M · Oct 2026](https://millionrounds.com/company/american-metal)[**Waymo** $27B · Oct 2026](https://millionrounds.com/company/waymo)[**Flai** $32M · Oct 2026](https://millionrounds.com/company/flai)[**Bloom** $418M · Oct 2026](https://millionrounds.com/company/bloom)[**Simple Energy** $199M · Sept 2026](https://millionrounds.com/company/simple-energy) ## 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