Quantinuum

Quantinuum is a full-stack quantum computing company formed in 2021 from the merger of Cambridge Quantum (UK-based quantum software) and Honeywell's quantum hardware division. It builds trapped-ion quantum computers alongside developer tools, application libraries, and cybersecurity products.

The company debuted on the Nasdaq Global Market under the ticker QNT on June 4, 2026, pricing an upsized IPO of 28,000,000 Class A shares at $60.00, $5 above the top of the range, and raising roughly $1.68 billion at a ~$15.4 billion market capitalization. Shares opened at $68 and touched $71.35 before closing near the offer price. Honeywell retains about 48% of the combined voting power following the offering.