Quantinuum is the world's largest integrated quantum computing company, formed in November 2021 from the merger of Cambridge Quantum Computing (software, cybersecurity) and Honeywell Quantum Solutions (trapped-ion hardware). The company develops quantum hardware systems, middleware, and software solutions for applications in cybersecurity, quantum chemistry, machine learning, Monte Carlo integration, and artificial intelligence. Quantinuum's H-Series trapped-ion quantum computers hold industry records for quantum volume (33,554,432 as of September 2025) and two-qubit gate fidelity (99.9%). The company has over 370 scientists and engineers across the US, UK, Germany, and Japan, with over 70% of its technology team holding PhDs.
Quantinuum is publicly traded
This company is no longer available on our private secondary market. Shares can be traded publicly under its listed ticker.
Company data and valuation marks are estimates and may be incomplete, stale, erroneous, or revised.
Founded
2021
Employees
501–1,000
Total Funding
$1.14B
2 rounds
Last Private Valuation
$10B
Sep 4, 2025
Nasdaq debut implied a valuation of roughly $14-15B, above the prior stored $10B post-money mark
Public market valuation now exceeds the last private post-money mark on file
Priced upsized IPO at $60/share (28M shares), raising $1.68B gross proceeds; began trading on Nasdaq as QNT on 2026-06-04.
Public listing resets the pricing/liquidity benchmark for any pre-IPO holders.
Raised $600M at $10B pre-money valuation in Sep 2025 capital round led by Honeywell.
Doubled valuation provides strong primary anchor; supports secondary premium.
Funding data and valuation marks are estimates and may be incomplete, stale, erroneous, or revised.
Total raised $1.14B across 2 rounds
Last updated 08-17-2026
| Date | Round | Amount Raised | Valuation | Lead Investors |
|---|---|---|---|---|
| Sep 4, 2025 | Series B | $838.8M | $10B | Quanta Computer |
| Jan 1, 2024 | Growth Equity | $300M | $5B | JPMorgan Chase |
Competitor list is illustrative and may be incomplete, stale, or erroneous.
IBM
Develops Condor and other quantum processors with focus on utility and enterprise integration; leading in quantum computing infrastructure.
IonQ
Focused on trapped-ion quantum systems with aggressive cloud platform strategy (AWS, Azure, Google Cloud); acquired Oxford Ionics in 2025.
Rigetti
Designs and manufactures superconducting quantum chips; offers hybrid quantum-classical computing platform for practical workloads.
PsiQuantum
Focused on building the world's first useful, error-corrected, million-qubit quantum computer.
Quantinuum completed its IPO and its Class A common stock began trading on the Nasdaq Global Market on June 4, 2026 under the ticker QNT, with the offering closing June 5, 2026. The upsized offering priced 28,000,000 shares at $60.00 per share for roughly $1.68B in gross proceeds (up to ~$1.83B if underwriters exercise the 4,200,000-share option). Shares opened at $68 and closed near flat on debut, giving a market value of about $15.7B; Honeywell retained a majority stake and roughly 48% of voting power.
Quantinuum shares can be purchased through any standard brokerage account — including Fidelity, Charles Schwab, TD Ameritrade, and online platforms like Robinhood or E*TRADE. Search for the ticker to place an order.
Quantinuum had a valuation of approximately $10B at the time of its public offering. Current market capitalization fluctuates with the share price.
Quantinuum raised $1.14B across 2 disclosed funding rounds prior to its public listing.
Quantinuum is headquartered in Cambridge, UK (European HQ); Broomfield, Colorado, USA (North American HQ).
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