United States · 
Who invested in Zephyr Fusion?
Zephyr Fusion's investors include Y Combinator, Pioneer Fund and ZAKA VC.
United States · Pre-seed startup
Who invested in Zephyr Fusion
Funding summaryUpdated 26 Oct 2026
$500Kraised across 1 round since 2025, from 1 source
- Latest round
- Pre-seed, $500KDec 2025
- Investors
- 3
The rounds
- Dec 2025
Founders and team
From Zephyr Fusion's own website: 1 founder, 2 on the team.
San DiegoFounding Mechanical Engineer
Everyone who backed them
Missing a round, or an investor who was in one? Tell us.
Also claim to have backed them
These 2 firms list Zephyr Fusion as a portfolio company on their own websites, but no report of a round names them. They are the firms' own claims, kept apart from the rounds above.
Quick answers about Zephyr Fusion
How much has Zephyr Fusion raised?
Zephyr Fusion has raised $500K across 1 round since 2025.
When did Zephyr Fusion last raise?
Zephyr Fusion's most recent round was a Pre-seed of $500K in Dec 2025.
What was Zephyr Fusion's biggest round?
Its most recent round, $500K in Dec 2025, is also its largest on record.
Who backed Zephyr Fusion first?
Zephyr Fusion's first round on record, in Dec 2025, was backed by Y Combinator, Pioneer Fund and ZAKA VC.
What stage is Zephyr Fusion at?
Zephyr Fusion's latest named round is a Pre-seed, in Dec 2025.
Where is Zephyr Fusion based?
Zephyr Fusion is based in the United States.
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