Honeywell’s Quantinuum upsizes IPO, targets $14.3 billion valuation

Quantinuum, the quantum computing firm backed by Honeywell, on Monday upsized its U.S. initial public offering, now targeting a valuation of up to $14.3 billion amid robust investor demand. The Broomfield, Colorado-based company plans to raise as much as $1.46 billion by selling 26.5 million shares priced between $53 and $55 apiece. The revised terms mark a significant increase from its earlier plan to raise $1.05 billion by offering 21.1 million shares at $45 to $50 each. The upsizing highlights growing momentum for quantum computing companies in public markets. Quantinuum is slated to list on the Nasdaq under the symbol “QNT” on Thursday, June 4, 2026. The debut comes as seven companies across defense and energy sectors are set to price their offerings this week, capitalizing on favorable market conditions ahead of SpaceX’s blockbuster listing. J.P. Morgan and Morgan Stanley are joint lead active book-running managers.