Key facts
- LiquidPiston’s last known valuation is $69.1M (Jun 2021).
- 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).
- ·Post-money valuations for all 7 rounds
- ·The complete investor list — 20 names
- ·Watchlist + deal alerts for LiquidPiston
Funding rounds
7 roundsAbout 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)
LiquidPiston doesn't have a composite mark yet — a PA Mark is published once enough pricing inputs exist (trade prints, fund marks, round prices). The rest of the record below builds toward it.
Recorded secondary trades
No secondary trades in LiquidPiston shares have been recorded yet. When a print lands — third-party, direct report, or platform — it appears here with structure, source, and price.
Institutional fund marks
No SEC-registered fund has reported a fair-value mark on LiquidPiston in its N-PORT filings yet. We sweep new filings monthly.