Commonwealth Fusion Systems LLC

Businessfiled

Commonwealth Fusion Systems LLC operates in Other Energy, based in CAMBRIDGE. Commonwealth Fusion Systems kicks off 2026 with SPARC’s first magnet installed, a Siemens-NVIDIA digital twin collaboration, and new board members.

Sub-sector tags: energy.

Capital & rounds (filed)filed

Commonwealth Fusion Systems LLC has raised $2.0B in disclosed capital across 3 recorded rounds, aggregated from public filings. Its latest round is modeled as Growth/Late (a round over $400M).

Largest single filing: $1.8B on 2021-11-19.

Most recent recorded round closed around 2021-11-19.

Valuation (modeled)modeled

Provath models Commonwealth Fusion Systems LLC at approximately $20.7B (range $13.5B–$33.1B). This is an algorithmic estimate from round sizes and same-niche peers — not a quoted or reported figure.

Read: Over-valued. Modeled value is 2.38× the median modeled value of Growth/Late Other Energy companies in 2019–2021 (5 peers) — value vs value, same stage and era.

Financing rhythm & timingmixed

Historic cadence: a new round about every 14 months.

Last raise 4.6 yr ago; this sector typically re-raises about every 12 months.

Silent for over 3× the sector's normal cadence.

The last round stepped up 22.5× from the prior — scaling.

Comparablesmixed

Capital scale ranks ahead of 100% of Other Energy peers (2049 compared).

Modeled value ranks above 100% of those peers.

Closest niche peers: Sino Resources Technology Co Ltd, Worleyparsons Ltd, Twb Asset Management Trust, Algonquin Gas Transmission, Llc.

Peoplefiled

7 named people on file across officers, directors and signatories.

Risks & flagsmixed

Financing has been silent well beyond sector cadence — possibly defunct, acquired, or paused.

Modeled above niche peers — valuation risk on entry.

No clearly named CEO/founder/principal in the surfaced records — key-person evidence is thin.