Quantinuum prices its IPO at $1.68bn, setting a new bar for quantum

The marketed range was $53 to $55. Quantinuum priced at $60. That gap, the willingness of investors to pay above what the bankers asked, is the real news in the Honeywell-backed company’s initial public offering, which raised $1.68bn and set a valuation the entire quantum-computing sector will now be measured against.

The mechanics are straightforward. Quantinuum sold 28m shares, upsized from a planned 26.5m, at $60 each, according to a source cited by Reuters. The pricing values the company at about $15.6bn based on the share count in its filings. It begins trading on the Nasdaq on Thursday under the ticker QNT, with JPMorgan and Morgan Stanley leading the offering.

The final figure caps a steady climb in ambition. Earlier targets put the raise nearer an upsized $1.46bn at a roughly $14.3bn valuation, themselves an increase on the $12.7bn the company had reportedly settled on after the $20bn-plus filing circulated earlier. The $1.68bn priced at $60 supersedes those earlier marks; the read on the IPO has moved as the book has firmed, and the latest number is the one that counts.

What investors are buying is more promise than revenue. Quantinuum reported about $31m in 2025 revenue against a valuation now north of $15bn, a ratio that makes the listing a wager on what the company will build rather than on what it currently sells.

It was formed in 2021 from the merger of Honeywell’s quantum business and Cambridge Quantum, and it builds quantum computers aimed at problems classical machines would take impractically long to solve. The company is working towards a fault-tolerant machine it calls Apollo, targeted for 2029.

Honeywell remains the anchor behind the company through the offering, expected to hold roughly 49% of the voting power afterwards, with founding shareholders Honeywell and Cambridge Quantum Holdings retaining around 82% of the equity between them.

The IPO is, on those numbers, as much a partial monetisation of an industrial conglomerate’s science bet as it is a debut for the quantum firm itself. The structure leaves Quantinuum with fresh public capital and Honeywell with a marked-to-market value on an asset it has held since the merger.

The significance runs past Quantinuum’s own balance sheet. This is the largest quantum-computing listing to date, which makes its pricing a reference point for a field that has been long on scientific milestones and short on public-market comparables.

Rivals already trading, and those weighing their own listings, now have a number to be valued against, and a demonstration that public investors will reach above the marketed range to own quantum exposure.

Whether the enthusiasm survives contact with quarterly reporting is the open question, and not one the pricing answers. A debut above range is a statement about demand on a single day.

Apollo is years out, revenue is modest, and the gap between a $15.6bn valuation and a working fault-tolerant computer is exactly the distance the sector has spent a decade trying to close. For now Quantinuum has set the bar. The trading starts Thursday.