France · 
Who invested in Mantle8?
Mantle8's investors include Breakthrough Energy, Sandwater, Bpifrance, IP Group and Wind, and 1 more on record. Sandwater led its latest round.
2027
$2.4MGrant$36MSeries A
France · Series A startup
Who invested in Mantle8
2 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 6 months ago
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Funding summaryUpdated 5 Nov 2026
$38Mraised across 2 rounds since 2026, from 2 sources
$2.4MGrant$36MSeries A
- Latest round
- Series A, $36MMay 2026
- Led by
- Sandwater
- Step-upi
- 15×
- 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
- Grant, $2.4M Mar 2026
- Biggest round
- $36M Series A · May 2026
- Between rounds
- 2 months from the last two
The rounds
- May 2026Series A$36M5 new1 returning
Reported by Ventureburn
- Mar 2026
Founders and team
From Mantle8's own website: 5 on the team.
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
Missing a round, or an investor who was in one? Tell us.
Also claim to have backed them
This firm lists Mantle8 as a portfolio company on their own website, but no report of a round names it. They are the firms' own claims, kept apart from the rounds above.
Quick answers about Mantle8
How much has Mantle8 raised?
Mantle8 has raised $38M across 2 rounds since 2026.
When did Mantle8 last raise?
Mantle8's most recent round was a Series A of $36M in May 2026, led by Sandwater.
What was Mantle8's biggest round?
Its most recent round, $36M in May 2026, is also its largest on record.
Who backed Mantle8 first?
Mantle8's first round on record, in Mar 2026, was backed by Breakthrough Energy.
What stage is Mantle8 at?
Mantle8's latest named round is a Series A, in May 2026.
Where is Mantle8 based?
Mantle8 is based in France.
Who led Mantle8's rounds?
Sandwater led the Series A in 2026.
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