Hydrostor

Toronto, Canada · Founded 2010 · Privately Held (backing)

Provider of advanced compressed air energy storage services intended to replace the use of fossil fuels. Hydrostor is based in Toronto, Canada and was founded in 2010. Its last reported valuation was $9.2 million in Oct 2016. It has raised $2.3 billion.

Last reported valuation
$9.2M
Oct 2026
Priced at
—
Total raised
$2.3B
Last round
—
What is Hydrostor worth?
$9.2Mlast reported valuation · Oct 2026

Hydrostor's last reported valuation, Oct 2016. 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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Hydrostor funding history

No rounds on record

No funding rounds for Hydrostor are on record yet — either the company hasn't raised institutional capital, or the raise hasn't surfaced in our sources.

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Hydrostor valuation

Hydrostor's last reported valuation was $9.2 million in Oct 2016. No priced round, secondary trade or fund mark has surfaced since.

How much has Hydrostor raised?

Hydrostor has filed 2 Form Ds with the SEC since 2021, most recently in Nov 2025 (null sold).

How Hydrostor'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 Hydrostor, 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 Hydrostor

What is Hydrostor worth?
Hydrostor is valued at $9.2M as of Oct 2026. Hydrostor's last reported valuation, Oct 2016. Nothing priced has surfaced since.
How much has Hydrostor raised?
Hydrostor has raised $2.3B in total funding across its recorded rounds.