Key facts
- Zephyr Fusion’s last known valuation is $7.1M (Oct 2025).
- It has raised $500K; the latest was Seed Round in Dec 2025.
- Notable investors include Y Combinator, Alumni Ventures, Pioneer Fund, Sterling Road, Spot VC — 10 tracked in total.
- Status: Privately Held (backing).
- ·The complete investor list — 10 names
- ·Watchlist + deal alerts for Zephyr Fusion
- ·The full record, as it builds
Funding rounds
No funding rounds for Zephyr Fusion are on record yet — either the company hasn't raised institutional capital, or the raise hasn't surfaced in our sources.
About Zephyr Fusion
Operator of a fusion energy technology company intended to build megawatt-class satellite power sources to unlock the industrial potential of orbit. The company is currently operating in Stealth Mode.
- Sector
- Business Products and Services (B2B)
- HQ
- San Diego, CA, United States
- Founded
- 2025
- Employees
- 2
- Website
- zephyrfusion.com/
- Ownership
- Privately Held (backing)
Zephyr Fusion doesn't have a composite mark yet — a PA Mark is published once enough pricing inputs exist (trade prints, fund marks, round prices). The rest of the record below builds toward it.
Recorded secondary trades
No secondary trades in Zephyr Fusion shares have been recorded yet. When a print lands — third-party, direct report, or platform — it appears here with structure, source, and price.
Institutional fund marks
No SEC-registered fund has reported a fair-value mark on Zephyr Fusion in its N-PORT filings yet. We sweep new filings monthly.