Breakthrough Energy Ventures
Portfolio in France · United States: 3 funded startups tracked by Uback, 2 of them in a ranking.
Portfolio on Uback3startups, 2 countries
In a ranking2ranked by AI-estimated valuation
On the Radar1eligible, not ranked
Latest deal trackedMay 2026Mantle8
Portfolio on Uback
Sorted by Uback rank, then Radar by last round| Company | Uback | Sector | Round backed | Valuation (AI) |
|---|---|---|---|---|
| Type One Energy | #13 Fusion & advanced nuclear | Energy & climate › Generation › Fusion & advanced nuclear | Convertible note · USD 87M · Jan 2026 | Hundreds of M$ |
| Xcimer Energy | #21 Fusion & advanced nuclear | Energy & climate › Generation › Fusion & advanced nuclear | Series A · USD 100M · Jun 2024 | Hundreds of M$ |
| Mantle8 | Radar | Climate tech › natural hydrogen exploration | Series A · USD ~35M (EUR 31M) · May 2026 | Not estimated |
Only startups that meet Uback’s eligibility rules are shown. Amounts are round sizes, not the fund’s share. Rounds as reported by public sources.
By sector
Deals tracked per year
12024
02025
22026
Co-investors
Sandwater · Bpifrance · Hedosophia · Lowercarbon
Investors that joined the same rounds, as reported by public sources.
Sources. finsmes.com, techcrunch.com, techfundingnews.com, xcimer.energy, as cited on each company’s profile.
Last updated: Oct 2026Report a missing dealReport an error
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