Quantinuum shares fall to $54 after IPO debut

Quantinuum, a leading quantum computing company, saw its stock price fall sharply on its second day of public trading, erasing an initially strong debut. The company, which was spun out of Honeywell, began trading on the Nasdaq on Thursday, June 4, 2026, after raising $1.68 billion by selling 28 million shares at $60 each, a price above its marketed range.

The stock opened its first day at $68, briefly climbing as high as $71.35 before closing just slightly above the IPO price at $60.38. However, on Friday, June 5, the share price dropped to $54 after the underwriting syndicate, led by J.P. Morgan and Morgan Stanley, ceased efforts to stabilize the price. The move represents a 10% decline from the offering price and a more than 20% loss for investors who bought at the first-day open.

The IPO was one of the largest fundraises to date in the quantum computing sector, giving Quantinuum an initial valuation of approximately $15.6 billion. The company was formed in 2021 through the merger of Honeywell's quantum solutions division and software firm Cambridge Quantum. Honeywell retains about 48% of the voting power in the company following the offering.