Xcimer Energy

Active#21 worldwide · Fusion & advanced nuclear

Fusion & advanced nuclear

Energy & climate›Fusion & advanced nuclear

HQUnited States

Last roundSeries A · Jun 2024

Uback rankings

Ranking	Tier	Rank	Edition	Next update
Fusion & advanced nuclear · worldwide	Top 45	#21	Edition 0 (beta) · Oct 2026	2 Mar 2027

Rank historyOct 2026 · #21 Fusion & advanced nuclearFirst edition: no movements yet.

Estimated valuation

AI · Fusion & advanced nuclear ranking (worldwide)

≈ USD 520MUSD 340–770M · Hundreds of M$ Medium confidence

Hundreds of k$

Millions $

Tens of M$

Hundreds of M$

Unicorn

Decacorn

Hectocorn

Anchor: Last known equity round: Series A · USD 100M · Jun 2024

An indicative editorial estimate produced by AI, imperfect by nature: neither a financial valuation nor investment advice. Only the market sets a company’s value. Method

Funding history

Date	Round	Amount	Type	Investors	Source
Jun 2024	Series A	USD 100M	Equity	Hedosophia, Breakthrough Energy Ventures, Lowercarbon	xcimer.energy

Minority investment from RTX Ventures in Sep 2026, amount undisclosed.

Rounds as cited by Uback’s rankings and their sources. Equity, debt and grants are shown separately; only equity rounds count towards the valuation anchor.

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What the AI reads

Press & investor announcements2 sources

Read by the AI at the next edition.

Comparable companies in fusion & advanced nuclear

Full fusion & advanced nuclear ranking →

Thea Energy#20United StatesHundreds of M$Aalo Atomics#22United StatesHundreds of M$Kyoto Fusioneering#19JapanHundreds of M$Last Energy#23United StatesHundreds of M$

Investors in Xcimer Energy: Hedosophia · Breakthrough Energy Ventures · Lowercarbon

Sources. xcimer.energy · finsmes.com

Last updated: Oct 2026Report an error

Uback is a content publisher. It provides no investment advice, receives no mandate and takes part in no transaction. Rankings, ranges and brackets are editorial estimates produced by AI, purely indicative.