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 summaryUpdated 26 Oct 2026

$22Mraised across 6 rounds since 2007, from 6 sources

$1.8MSeries A$6.5MGrowth$5.0MSeries B$1.5MSeries B$6.5MSeries C$500KRound

Latest round: Round, $500KMar 2026
Biggest round: $6.5MSeries 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.

2007201020132016201920222025

$1.8MSeries A$6.5MGrowth$5.0MSeries B$6.5MSeries C$500KRound

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 yetSEC filing: $500K sold, first sale Mar 2026
Jul 2013
Series C$6.5M2 returning
- Adams Capital Management
- Northwater Capital
Reported by finsmes.comSEC filing: $2.3M sold, first sale Jun 2013
Dec 2011
Series B$1.5M
No investor was named in the report.
Reported by masshightech.comSEC filing: $6.5M sold, first sale Jan 2011
Jan 2011
Series B$5.0M1 new1 returning
- Adams Capital Management
- Northwater Capital
Reported by finsmes.comSEC filing: $2.2M sold, first sale Jan 2011
Jan 2011
Growth$6.5M
No investor was named in the report.
Reported by sec.govSEC filing: $2.2M sold, first sale Jan 2011
Jul 2007
Series A$1.8M1 new
- 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$4.9Mcommon stockof $5.0M offeredCrowdfunding
Apr 2020$1.1Mcommon stockof $1.1M offeredCrowdfunding
Dec 2019$1000Kotherof $1.0M offeredCrowdfunding
Dec 2019$888Kotherof $1.1M offeredCrowdfunding

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 A2007Growth2011Series B2011Series B2011Series C2013Round2026

Adams Capital ManagementNorthwater Capital

Everyone who backed them

Adams Capital ManagementVC firm3rounds

Northwater CapitalVC firm2rounds

Missing a round, or an investor who was in one? Tell us.

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.