Quantinuum Files for U.S. IPO, Plans Nasdaq Listing Under Ticker QNT, Honeywell Says

Honeywell said Friday that Quantinuum, its majority-owned quantum computing company, has publicly filed for a traditional U.S. initial public offering and plans to list on the Nasdaq Global Select Market under the ticker QNT. The company has not yet determined how many shares of Class A common stock it will offer or the price range, according to Honeywell’s press release.

Honeywell said J.P. Morgan and Morgan Stanley are serving as joint lead active book-running managers, with Jefferies and Evercore ISI as active book-running managers. Honeywell said in the release that “Quantinuum … has publicly filed a registration statement on Form S-1 with the U.S. Securities and Exchange Commission … relating to a proposed initial public offering of shares of its Class A common stock.” It also said the filing is not yet effective, adding: “The registration statement relating to these securities has been filed with the SEC but has not yet become effective. These securities may not be sold, nor may offers to buy be accepted, prior to the time the registration statement becomes effective.”

At the time of reporting, the underlying S-1 text was not immediately visible in an obvious search of the SEC’s EDGAR database, the agency’s corporate filing system, so details in this report are limited to what Honeywell disclosed publicly. Honeywell did not provide offering size, a proposed price range or other prospectus details in its announcement.

The public filing follows an earlier confidential submission. Quantinuum had confidentially submitted a draft registration statement to the SEC on Feb. 17, 2026, a step the company disclosed publicly in April.

Quantinuum was formed in November 2021 through the combination of Honeywell Quantum Solutions and Cambridge Quantum. That history makes the IPO more than a startup-market debut: Honeywell has described itself in prior disclosures as Quantinuum’s controlling or majority owner, and previous filings referenced a 54% ownership stake at formation. In January 2024, Quantinuum closed a $300 million equity funding round at a $5 billion pre-money valuation, with Honeywell remaining the majority shareholder.

Honeywell describes Quantinuum as a full-stack quantum computing company headquartered in Broomfield, Colorado, with facilities in the United States, Britain, Germany, Japan and Singapore.

The filing is notable because it points to a conventional IPO path in a sector where several already public quantum computing companies, including IonQ, D-Wave and Rigetti, reached the market through mergers with special purpose acquisition companies, or SPACs, rather than a traditional stock offering.