United States · 
Who invested in Fluidstack?
Fluidstack's investors include Seedcamp, Jane Street, Mana Ventures, Episode 1 and Mercuri VC, and 1 more on record.
20262027
$450MVenture$1.0BRound$1.5BGrowth
United States · Growth startup
Who invested in Fluidstack
3 rounds we have observed, with the 6 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.
Raised 2 months ago
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Funding summaryUpdated 5 Nov 2026
$3.0Braised across 3 rounds since 2026, from 3 sources
$450MVenture$1.0BRound$1.5BGrowth
- Latest round
- Growth, $1.5BSept 2026
- Step-upi
- 1.5×
- Investors
- 6 (1 led)
The funding story
Each circle is a round, placed by date and sized by amount. The line above is the running total.
- First round
- Venture, $450M Jan 2026
- Biggest round
- $1.5B Growth · Sept 2026
- Usual gap between rounds
- 5 months the median of 2
The rounds
- Sept 2026Growth$1.5B4 new1 returning
Also list them on their own siteHypersphere Capital
Source recordedSEC filing: $730M sold
- Apr 2026
- Jan 2026
Funding filed with regulators
Fluidstack filed 3 raises, $2.0B in all. Filings say how much was sold and to how many investors; they never name the investors.
- Jun 2026$730MSEC Form D
- May 2026$842MSEC Form D
- Jan 2026$450MSEC Form D
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.
Everyone who backed them
Jane StreetGrowth equity1round, led 1
Missing a round, or an investor who was in one? Tell us.
Also claim to have backed them
These 11 firms list Fluidstack 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.
Quick answers about Fluidstack
How much has Fluidstack raised?
Fluidstack has raised $3.0B across 3 rounds since 2026.
When did Fluidstack last raise?
Fluidstack's most recent round was a Growth of $1.5B in Sept 2026.
What was Fluidstack's biggest round?
Its most recent round, $1.5B in Sept 2026, is also its largest on record.
Who backed Fluidstack first?
Fluidstack's first round on record, in Jan 2026, was backed by Seedcamp.
What stage is Fluidstack at?
Fluidstack's latest named round is a Growth, in Sept 2026.
Where is Fluidstack based?
Fluidstack is based in the United States.
Who led Fluidstack's rounds?
Jane Street led the funding round in 2026.
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