Funding round
Fluidstack Series B
Fluidstack, which works in AI infrastructure solutions development in London, raised $1.50B in a Series B round announced on 9 Sep 2026, led by Jane Street Capital, at a $18.00B post-money valuation. 1 firm took part. It is Fluidstack's third venture round on record; the one before was a Series A in Jul 2026.
$1.50B
Amount raised
$18.00B
Post-money valuation
$16.50B pre-money
1
Investors
1 lead
2.4x
Step-up from the Series A
$7.50B in Jul 2026
8.3%
Stake sold
new money over the post-money
Valuation
What this round says about the price
This round priced Fluidstack at $18.00B after the new money, 2.4 times the $7.50B of its Series A (Jul 2026). The $1.50B bought investors about 8.3% of the company. It came 2 months after Fluidstack's Series A. It is 64% of the $2.33B Fluidstack has raised in the venture rounds on record. No later venture round is on record for Fluidstack.
Investors
Who put money in
Jane Street Capital led the round.
Lead investor
- Jane Street Capital new investor
Comparable rounds
How it compares
9 Series B rounds in Hosting & Cloud Infrastructure Providers within a year either side disclosed an amount; the median was $150M, and this round was 10 times the median. The closest in time, other companies' Series B rounds in Hosting & Cloud Infrastructure Providers:
| Company | Announced | Amount | Post-money | Led by |
|---|---|---|---|---|
| Hosting & Cloud Infrastructure Providers | 22 Sep 2026 | $189M | $1.00B | Emergence Capital |
| Hosting & Cloud Infrastructure Providers | 1 Oct 2026 | $223M | not disclosed | ARCHIV |
| Hosting & Cloud Infrastructure Providers | 20 Oct 2026 | $60M | $1.00B | FirstMark |
| Hosting & Cloud Infrastructure Providers | 12 Aug 2026 | $45M | $550M | Peak XV Partners |
| Hosting & Cloud Infrastructure Providers | 9 Oct 2026 | $30M | not disclosed | ADATA Technology |
| TensorWave Hosting & Cloud Infrastructure Providers | 10 Jun 2026 | $350M | $1.55B | Magnetar Capital and AMD Ventures |
| PaleBlueDot AI Hosting & Cloud Infrastructure Providers | 28 Jan 2026 | $150M | $1.00B | B Capital |
| Hosting & Cloud Infrastructure Providers | 22 Jan 2026 | $100M | not disclosed | TQ Ventures |
Sources
Where this comes from
Reported by 3 sources.
Questions
Frequently asked
How much did Fluidstack raise in its Series B round?
Fluidstack raised $1.50B in its Series B round, announced in Sep 2026.
Who led Fluidstack's Series B round?
Jane Street Capital led it.
What was Fluidstack's valuation at the Series B round?
$18.00B post-money ($16.50B pre-money).
How does it compare with other Series B rounds in Hosting & Cloud Infrastructure Providers?
9 Series B rounds in Hosting & Cloud Infrastructure Providers within a year either side disclosed an amount; the median was $150M, and this round was 10 times the median.