LiquidPiston

Bloomfield, CT · Founded 2003 · Privately Held (backing)

Manufacturer of advanced rotary internal combustion engines intended for unmanned aerial vehicles and the automotive industry. LiquidPiston is based in Bloomfield, CT and was founded in 2003. Its last reported valuation was $69.1 million in Jun 2021. It has raised $74.4 million across 7 recorded rounds; the latest was a $500,009 seed round in Mar 2026.

Last reported valuation
$69.1M
Oct 2026
Priced at
—
Total raised
$74.4M
Last round
Seed Round
Mar 2026
What is LiquidPiston worth?
$69.1Mlast reported valuation · Oct 2026

LiquidPiston's last reported valuation, Jun 2021. Nothing priced has surfaced since.

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Valuation timeline

0 priced rounds · 32 daily marks since · Sep 2026 – Oct 2026
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Markrounds hold their value until the next priced eventMark, today
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LiquidPiston funding history

7 rounds
DateRoundRaisedPost-money
Mar 2026Seed Round$500K▮
Mar 2019Debt$250K▮
Jul 2017Debt$299K▮
Mar 2016Debt$1.2M▮
Feb 2016Debt$251K▮
Feb 2015Seed Round$1.1M▮
+ 1 earlier rounds · a free account shows the full history
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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).

How LiquidPiston's valuation is determined

Private company valuations aren’t quoted on an exchange — they’re established in moments: a priced funding round sets a post-money valuation, secondary trades print at a price per share, and SEC-registered funds holding the stock report fair-value marks in their N-PORT filings.

For LiquidPiston, the most current credible signal sets the number and the older ones confirm it: a live secondary-market price first, then three or more recent prints, then institutional fund marks, and otherwise the last priced round, which never decays. The valuation is the last round’s post-money moved by the price change since that round, so no share count is assumed. Today it is set by last reported valuation. Question about this number? Full methodology →

Frequently asked about LiquidPiston

What is LiquidPiston worth?
LiquidPiston is valued at $69.1M as of Oct 2026. LiquidPiston's last reported valuation, Jun 2021. Nothing priced has surfaced since.
How much has LiquidPiston raised?
LiquidPiston has raised $74.4M in total funding across 7 recorded rounds.
When did LiquidPiston last raise?
LiquidPiston last raised in Mar 2026 (Seed Round), raising $500K.