Commonwealth Fusion Systems Current · Verified less than 14 days ago · Last verified: Oct 8, 2026

Commonwealth Fusion Systems: $18.5B valuation, IPO Readiness 64, Series E. Commercial fusion energy using high-temperature superconducting magnets. Track live on The IPO Stack.

Series EClean Energy / Fusionpre-ipo
64
/100
IPO Readiness Score
Grade C — Moderate IPO Readiness
TechStackIPO proprietary score based on funding scale, valuation, stage progression & momentum.
Track Commonwealth Fusion Systems →

Commercial fusion energy using high-temperature superconducting magnets

Valuation
$18.5B
Total Funding
$5.2B
Stage
Series E
Sector
Clean Energy / Fusion
Headquarters
Cambridge, MA
CEO
Bob Mumgaard
IPO Status
pre-ipo

Funding History

June 2026
Series C
$1.2B
July 2026
Series D
$1.2B
August 2026
Series E
$1.5B
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Track Commonwealth Fusion Systems IPO timeline, funding rounds, investor activity, and valuation on TechStackIPO — the pre-IPO intelligence platform.

Frequently Asked Questions

When is Commonwealth Fusion Systems going public? +

Commonwealth Fusion Systems has not announced a specific IPO date as of 2026. Track TechStackIPO for the latest funding milestones and IPO signals. Subscribe to The IPO Stack newsletter for weekly updates.

What is Commonwealth Fusion Systems's current valuation? +

Commonwealth Fusion Systems is valued at $18.5B as of the most recent funding round. This valuation is based on its most recent private funding round tracked by TechStackIPO.

How can I invest in Commonwealth Fusion Systems before IPO? +

Accredited investors can access Commonwealth Fusion Systems shares through secondary market platforms, pre-IPO investment funds, and broker-dealer platforms that facilitate private company transactions. TechStackIPO's marketplace tracks available access options. Note: pre-IPO investments carry higher risk and limited liquidity compared to public market investing.

What is Commonwealth Fusion Systems's IPO Readiness Score? +

Commonwealth Fusion Systems scores 64/100 (Grade: C) on TechStackIPO's IPO Readiness Index. The score evaluates funding scale, valuation trajectory, funding momentum, stage progression, and company maturity. Scores above 70 indicate strong near-term IPO potential.

How much total funding has Commonwealth Fusion Systems raised? +

Commonwealth Fusion Systems has raised $5.2B in total venture capital and private equity funding.

What sector is Commonwealth Fusion Systems in? +

Commonwealth Fusion Systems is a Clean Energy / Fusion company. Commercial fusion energy using high-temperature superconducting magnets.

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