LiquidPiston key facts
as of Oct 2026- Manufacturer of advanced rotary internal combustion engines intended for unmanned aerial vehicles and the automotive industry.
- LiquidPiston is valued at approximately $69.1M as of Oct 2026 (last reported valuation).
- It has raised $74.4M across 7 recorded rounds; the latest was Seed Round ($500K) in Mar 2026.
- Notable investors include United States Department of War, Pritzker Group Venture Capital, Sternhill Associates, Northwater Capital Management, Adams Capital Management — 20 tracked in total.
- LiquidPiston has filed 16 Form Ds with the SEC since 2011, most recently Nov 2024 ($25K sold to 1 investors).
- Status: Privately Held (backing).
LiquidPiston's last reported valuation, Jun 2021. Nothing priced has surfaced since.
- ·The complete investor list: 20 names
- ·Watch LiquidPiston: the Monday email on marks, rounds and moves
LiquidPiston funding rounds
7 roundsWho backs LiquidPiston
20+Membership and data by Private Market View
LiquidPiston valuation
LiquidPiston's last reported valuation was $69.1 million in Jun 2021. No priced round, secondary trade or fund mark has surfaced since.
How much has LiquidPiston raised?
LiquidPiston has raised $74.4 million in total; 7 of its rounds are on record, from 2013 on. The largest on record was a $500,009 seed round in Mar 2026.
LiquidPiston has filed 16 Form Ds with the SEC since 2011, most recently in Nov 2024 ($25,010 sold to 1 investor).
LiquidPiston investors
20 investors are on record for LiquidPiston, including United States Department of War, Pritzker Group Venture Capital, Sternhill Associates and Northwater Capital Management. The seed round in Mar 2026 drew 1 investor.
About LiquidPiston
Manufacturer of advanced rotary internal combustion engines intended for unmanned aerial vehicles and the automotive industry. The company's technology has different thermodynamic cycles, architecture and operations that make engines smaller and lighter than traditional diesel engines, enabling customers to get compact, efficient, low-vibration and multi-fuel capable combustion engines.
- Sector
- Business Products and Services (B2B)
- HQ
- Bloomfield, CT, United States
- Founded
- 2003
- Employees
- 50
- Website
- liquidpiston.com/
- Ownership
- Privately Held (backing)
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