Quantinuum is a privately held quantum computing company formed by the merger of Cambridge Quantum and Honeywell Quantum Solutions. It builds trapped-ion quantum computers and software for research, chemistry, and cybersecurity use cases.
Access to pre-IPO shares is available to accredited investors through UpMarket.
Latest Price
$10B
Capital raise, Sep 2025, Perplexity
UpMarket Estimate
$10B
Based on UpMarket valuation model
Previous Price
$5B
Series C Jan 2024
How to Invest in Quantinuum Through UpMarket
Quantinuum shares are not on public exchanges. UpMarket provides accredited investors access through secondary market transactions.
Step 01
Verify accredited investor status
Confirm eligibility under SEC Rule 501 of Regulation D. Income or net worth threshold applies.
Step 02
Create an UpMarket account
Complete KYC/AML onboarding. Typically 1–2 business days. Licensed rep assigned on signup.
Step 03
Review available Quantinuum offerings
Full offering memoranda and risk disclosures provided before any commitment is required.
Step 04
Complete subscription documents
Review and sign subscription agreement. All documents handled digitally through the platform.
Step 05
Fund your investment
Wire transfer or ACH. $50K minimum. Funds held in custodial account until close.
Pre-IPO investments are illiquid, speculative, and involve risk of total loss of capital.
$1.3B+
UpMarket has brokered over $1.3 billion in alternative investments*
*Includes principal invested and appreciation of investments originated via the UpMarket platform based on historical trade volume and valuation estimates through March 31, 2026. Of the total, approximately $301 million is managed by UpMarket Management, with the remaining originated investments managed by affiliates. Past performance is not predictive of future results.
Valuation Growth Over Time
Post-money valuation by round
Previous roundsMost recent
Date
Round
PPS (split-adj.)
Valuation
Sep 2025
Capital raise
$10B
Jan 2024
Series C
$5B
Quantinuum Revenue and Growth
Annual revenue
Why Investors Are Watching Quantinuum
Growth Signal
Quantinuum raised $600M at $10B pre-money in 2025
Honeywell announced an approximately $600 million equity raise for Quantinuum on Sept. 4, 2025, at a $10 billion pre-money valuation. Investors included Quanta Computer, NVentures, QED Investors, JPMorganChase, Mitsui, Amgen and Honeywell.
Quantinuum says it has the world's highest-performing quantum computer and a full-stack technology platform built by world-class scientists. The company describes its integrated hardware and software stack as a basis for scaling quantum computing across scientific and commercial uses.
Market Opportunity
Quantinuum filed for IPO after reporting $30.9M revenue
Quantinuum filed for a U.S. IPO in May 2026 that could raise up to $1.05 billion and value the company at about $12.7 billion at the top of the range. The filing reported 2025 revenue of $30.9 million and bookings of $79.3 million, showing a large gap between current sales and expected market scale.
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No. As of March 2026, Quantinuum is a private company and does not trade on any public stock exchange. Accredited investors can access Quantinuum shares through UpMarket, a FINRA-registered broker-dealer that specializes in pre-IPO investments.
Quantinuum does not have a public stock price because it is privately held. The most recent known share price comes from its last funding round. Pre-IPO share prices on the secondary market may differ from the last round price depending on supply, demand, and market conditions.
Yes. Accredited investors can indicate interest in Quantinuum shares through UpMarket by filling out the form on this page or creating an account at upmarket.co. All pre-IPO offerings are subject to availability and require a $50,000 minimum investment. UpMarket is a FINRA-registered broker-dealer and has brokered more than $500M in alternative investments since 2019.
Pre-IPO investments carry significant risks. Quantinuum shares are illiquid, meaning there is no public market to sell them quickly. There is no guaranteed exit timeline or return. The investment is speculative in nature, and investors should be prepared for the possibility of total loss. Valuations of private companies can fluctuate substantially between funding rounds. Investors should consult their financial advisor and review all offering documents before investing.
In a pre-IPO transaction, accredited investors purchase shares from existing shareholders (such as employees, early investors, or other holders) through secondary market platforms. The company itself does not issue new shares in these transactions. UpMarket facilitates these trades as a FINRA-registered broker-dealer, handling compliance, documentation, and settlement on behalf of both parties.
There are two primary exit paths for pre-IPO holdings: selling your shares on the secondary market to another buyer, or holding until the company completes an IPO or is acquired. Both paths are subject to transfer restrictions, company approval (right of first refusal), and market conditions. The timing of any exit is unpredictable, and investors should plan for a multi-year holding period.
The minimum investment for most pre-IPO offerings on UpMarket is $50,000. This amount may vary depending on the specific offering and share availability. There are no fees to create an UpMarket account or browse available investments. Investors only pay transaction-related fees when they complete an investment.
UpMarket's valuation estimate of is derived from a proprietary model that incorporates multiple data sources: funding round data (Caplight), revenue estimates (Sacra), secondary market pricing, and public company comparables. The model applies a private company discount to the public comp multiple to account for illiquidity and information asymmetry. This estimate is not investment advice and may differ substantially from the price at which shares actually trade.
Quantinuum builds trapped-ion quantum computers and software, and reported $30.9M in 2025 revenue; its 2025 $600M raise at a $10B pre-money valuation reinforced investor backing — accredited investors can access Quantinuum stock through UpMarket.