Quantinuum, the quantum computing company majority-owned by Honeywell, priced its IPO at $60 per share on June 3, raising $1.68 billion and landing a $15.6 billion valuation. The company began trading under the ticker QNT on the Nasdaq Global Market the following day.
The original fundraising target was $1.05 billion. Quantinuum blew past that by more than 60%, upsizing the offering to 28 million shares and pricing above its initial range of $53 to $55.
From private darling to public debut
Quantinuum raised a $300 million round at a $5 billion pre-money valuation, then followed that with a $600 million private funding round in September 2025 at a $10 billion valuation. The IPO effectively added another 56% on top of that September figure, pushing the company to $15.6 billion, well above its pre-IPO target of $12.7 billion.
The company was born in 2021 from the merger of Honeywell Quantum Solutions and Cambridge Quantum Computing. Honeywell brought the hardware expertise and trapped-ion quantum processors, while Cambridge Quantum contributed software and algorithm capabilities.
