PsiQuantum
PS
PsiQuantum develops fault-tolerant quantum computers based on silicon photonics. Its systems use photons and integrated photonic chips that can be manufactured in semiconductor foundries. The company targets large-scale machines for solving computational problems beyond classical computers.
Founded by Jeremy O'Brien (Co-founder, Executive Chairman (former CEO)), Terry Rudolph (Co-founder, Chief Architect), Pete Shadbolt (Co-founder, Chief Scientific Officer), Mark Thompson (Co-founder, CTO)
Blended valuation$5.7B$5.1B secondary
Valuation history
Weekly blended valuation with priced funding rounds marked on the timeline.
$9.5B
blended valuationfunding round
May 31, 2021$1.4BOct 5, 2026
All rounds
12 funding rounds, newest first.
| Round | Announced | Raised | Post-money |
|---|---|---|---|
| Series C | Jan 21, 2026 | $100M | — |
| Round | Jan 21, 2026 | — | $9.8B |
| Series E | Sep 10, 2025 | $1B | $7B |
| Growth | May 30, 2025 | $22M | — |
| Series E | Mar 1, 2025 | $750M | — |
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Investors
37 investors across all rounds.
- BLBlackRock
- BGBaillie Gifford
- PGPlayground Global
- FFFounders Fund
- ATAtomico
- THTemasek Holdings
- BVBlackbird Ventures
- M-M12 - Microsoft's Venture Fund
- RERedpoint
- NVNVIDIA
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Secondary market activity
Recent buy and sell interest for PsiQuantum shares on the secondary market.
| Kind | Implied valuation | Price / share | Date |
|---|---|---|---|
| $4.6B | $27.00 | Oct 6, 2026 | |
| $5B | $41.13 | Oct 6, 2026 | |
| $4.6B | $27.00 | Oct 5, 2026 |
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Data as of Oct 14, 2026. Valuations are estimates blended from primary and secondary-market signals — not investment advice.