Funding round
Commonwealth Fusion Systems Series C
Commonwealth Fusion Systems, which works in fusion power plant manufacturing and delivery in Harvard, raised $1.00B in a Series C round announced on 30 Jul 2026. It is Commonwealth Fusion Systems' third venture round on record; the one before was a Series B in Aug 2025.
$1.00B
Amount raised
Not disclosed
Post-money valuation
Valuation
What this round says about the price
Commonwealth Fusion Systems did not disclose a valuation in this round. It came 11 months after Commonwealth Fusion Systems' Series B. It is 51% of the $1.95B Commonwealth Fusion Systems has raised in the venture rounds on record. No later venture round is on record for Commonwealth Fusion Systems.
Use of proceeds
What the money is for
According to the announcement, the money goes to product development and scaling operations.
- Product development
- Scaling operations
Comparable rounds
How it compares
The closest in time: 1 in Electric Supplies & Power Generation, then Series C rounds in any sector within 6 months:
| Company | Announced | Amount | Post-money | Led by |
|---|---|---|---|---|
| Electric Supplies & Power Generation | 2 Feb 2026 | $176M | not disclosed | not named |
| Together AI Tech Companies | 1 Jul 2026 | $800M | $8.30B | Aramco Ventures |
| Neko Health Health Care Services | 15 Jul 2026 | $700M | $7.00B | Lightspeed Venture Partners and O.G. Venture Partners |
| Multiverse Computing Tech Companies | 27 Jul 2026 | $570M | $1.70B | Forgepoint Capital and BNPP Solar Impulse Venture Fund |
| Antora Batteries | 30 Jul 2026 | $550M | $2.47B | G2 Venture Partners and Eclipse |
| Antares Electronical Components Manufacturing | 27 Jul 2026 | $470M | not disclosed | Paradigm and Caffeinated |
| Automobile Dealers & Manufacturers | 21 Jul 2026 | $148M | not disclosed | not named |
| Industrial Machinery & Supplies | 6 Jul 2026 | $147M | not disclosed | Cathay Capital |
Sources
Where this comes from
Reported by 5 sources.
Questions
Frequently asked
How much did Commonwealth Fusion Systems raise in its Series C round?
Commonwealth Fusion Systems raised $1.00B in its Series C round, announced in Jul 2026.
What was Commonwealth Fusion Systems' valuation at the Series C round?
It was not disclosed.