Startup profile · funding coverage
PsiQuantum funding, valuation and investors
Photonic quantum-computing developer building large fault-tolerant systems.
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Funding, valuation & investors
Answer-first snapshotLatest funding
Series E
$1B · September 10, 2025
Latest known valuation
$7B at the financing; not a current market price
Series E · September 10, 2025
Total disclosed equity funding
$1.4B
Excludes debt, grants, acquisitions, secondaries, and IPO proceeds.
Current status
private
growth · Palo Alto, California, United States
Investors in latest funding
Lead: Funds and accounts managed by affiliates of BlackRock , Temasek , Baillie Gifford
Other: Entities administered by Macquarie Capital , Ribbit Capital , NVentures , Adage Capital Management , Qatar Investment Authority , Type One Ventures , Counterpoint Global (Morgan Stanley) , 1789 Capital , S Ventures , Blackbird , Third Point , T. Rowe Price
Overview
PsiQuantum is developing quantum computers based on photonic chips and semiconductor manufacturing. Its strategy targets a fault-tolerant machine rather than a small general-purpose processor sold as a finished product today. The company announced a $450 million Series D in July 2021 and a $1 billion Series E at a $7 billion valuation in September 2025.
The financing history below contains selected company-disclosed rounds, not an assertion that every earlier transaction is captured. Government support, research contracts and construction commitments must be tracked separately from private equity.
The commercial questions are whether optical losses, component quality, packaging and error-correction overhead can be controlled at system scale, and whether useful workloads justify the complete operating cost.
Why PsiQuantum is interesting
Its $1 billion Series E brought asset managers, sovereign capital and NVIDIA into a capital-intensive bet on photonic manufacturing and large-scale systems.
Funding history (newest first)
Series E
2025-09-10 $1B Valuation: $7B at the financing; not a current market price- Funds and accounts managed by affiliates of BlackRock (lead)
- Temasek (lead)
- Baillie Gifford (lead)
- Entities administered by Macquarie Capital (participant)
- Ribbit Capital (participant)
- NVentures (participant)
- Adage Capital Management (participant)
- Qatar Investment Authority (participant)
- Type One Ventures (participant)
- Counterpoint Global (Morgan Stanley) (participant)
- 1789 Capital (participant)
- S Ventures (participant)
- Blackbird (participant)
- Third Point (participant)
- T. Rowe Price (participant)
Source: Read source · psiquantum.com
Series D
2021-07-27 $450M- Funds and accounts managed by BlackRock (lead)
- Baillie Gifford (participant)
- M12 (participant)
- Blackbird Ventures (participant)
- Temasek (participant)
Source: Read source · businesswire.com
Investors in our directory
Funds linked from PsiQuantum's profile — open a fund page for stage focus and related deal articles.
Competitive landscape
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Xanadu direct
Also pursues photonic quantum computing, but its architecture and commercial roadmap differ.
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Quandela direct
Photonic quantum-computing systems and components.
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QuEra alternative
Neutral-atom approach to quantum computing; financing size alone does not compare technical performance.
Industries
Market / IPO context
Editorial / static context — not a live quote.
FAQs about PsiQuantum
Practical answers founders, operators, and investors typically search for.
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Editorial note: AI tools assisted with research, structure, or drafting. Venture Capital Tracker retains human editorial responsibility for factual accuracy, relevance, and source quality before publication.