Commonwealth Fusion Systems funding history

4 disclosed rounds · sourced from the FOBI roster

Total raised

$3B

Rounds tracked

For subscribers

Per-round date, stage, amount, lead investors, and the full valuation curve.

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Date	Stage	Amount	Valuation	Lead investors
2025-08-28	Series B	$863M	—	—
2021-11-01	Series B	$1.8B	—	Temasek, Google
2020-05-26	Series A	$84M	—	Temasek
2019-06-27	Series A	$115M	—	Eni, Breakthrough Energy Ventures