Quantinuum

Quantinuum was formed in 2021 from the merger of Honeywell Quantum Solutions and Cambridge Quantum Computing. Honeywell had been quietly building one of the most sophisticated trapped ion quantum computing programs in the world, directly drawing on the Nobel Prize-winning research of David Wineland at NIST Boulder. The Cambridge Quantum acquisition added software, algorithms, and chemistry simulation capabilities. The combined company is headquartered in Broomfield, Colorado, and operates trapped ion quantum systems that hold the record for gate fidelity, meaning the precision with which quantum operations can be executed. Their H-Series systems have demonstrated 99.9%+ two-qubit gate fidelity, the best published number in the industry. A 100-qubit H-Series system was delivered to the UK National Quantum Computing Centre in 2024. Quantinuum has also published landmark results in quantum error correction, ahead of most competitors. The next-generation Helios system is the publicly stated stepping stone toward what the company calls universal fault-tolerant computing.

Funding has accelerated sharply. The January 2024 Series A raised $300M at roughly a $5B valuation with JPMorgan Chase, Mitsui, and Amgen leading. In September 2025, Honeywell announced a $600M capital raise at a $10B pre-money valuation, doubling the company's valuation in less than two years. The round was reported to have closed oversubscribed at approximately $800M by early November 2025, with new investors NVentures (NVIDIA's venture arm), Quanta Computer, QED Investors, MESH, and Korea Investment Partners joining alongside existing shareholders; secondary reporting also names Fidelity International as participating. Total capital raised since the 2021 founding is on the order of $1.1 billion. The S-1 filing reports Honeywell as holding approximately 54% of common stock as of December 31, 2025.

On February 17, 2026, Quantinuum confidentially submitted a draft S-1 to the SEC. On May 8, 2026, Honeywell announced that Quantinuum had publicly filed its S-1, with the company intending to list Class A common stock on the Nasdaq Global Select Market under the ticker QNT. J.P. Morgan and Morgan Stanley are joint lead book-running managers, with Jefferies and Evercore ISI also active. The IPO priced at $60 per share on June 3, 2026, above the $53 to $55 range, and the stock began trading on the Nasdaq Global Select Market under the ticker QNT on June 4, 2026. Quantinuum is also a founding collaborator at NVIDIA's Accelerated Quantum Research Center, anchoring its position in the emerging GPU-quantum compute stack. The listing makes Quantinuum Colorado's most significant public quantum listing to date.