By Mackenzie Tatananni

Quantinuum stock debuted above its initial public offering price on Thursday, with shares opening at $68.

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Quantinuum raised $1.68 billion in its upsized initial public offering late Wednesday, setting the stage for one of the most anticipated tech listings of the year.

The quantum computing company's IPO of 28 million shares was priced at $60 apiece. Underwriters have been granted a 30-day option to sell an additional 4.2 million shares if demand is higher than expected, Quantinuum said.

From SpaceX to Anthropic, the pipeline of blockbuster IPOs is moving fast. But for quantum enthusiasts, Quantinuum's forthcoming trading debut is a chance to back a rising market leader.

The Honeywell-backed upstart is slated to go public Thursday, with an indicated opening price of $75. Shares will be listed on the Nasdaq Global Market under the ticker symbol "QNT."

"I put the company in the context of an entire industry," CEO Rajeeb Hazra told Barron's ahead of the debut. "For the computing industry, this is a very transformative period, where there's an insatiable need for more compute to do things that AI or high-performance computing can do."

In the CEO's view, quantum computing is the answer to the industry's growing sustainability problem. "What is needed is a new form of compute that can continue the kind of performance, perhaps even extended beyond what classical computing can do, but consume far less energy," Hazra said. "That's the promise of quantum computing."

Interest in the technology has exploded over the past year. Moving far beyond theory, it represents an entirely different way of processing information. Quantum systems harness physics to solve problems far outside the reach of traditional machines, promising exponential speedups on tasks that would take classical supercomputers millennia to complete.

Quantinuum itself aims to capitalize on this wave of interest. Just on Monday, the company upsized its IPO to 26.5 million shares for $53 to $55 each. At the top end of the range, Quantinuum would have had a market value of $14.3 billion, making it the second-largest publicly traded quantum company behind IonQ.

The IPO caps months of uncertainty for investors looking to Quantinuum as the next big force in quantum computing. Formed in 2021 through a merger between Honeywell Quantum Solutions and a U.K.-based start-up, Quantinuum has built a roster of collaborators across the energy, aerospace, and finance sectors.

It also has secured the backing of the U.S. government. As part of a $2 billion funding package, Quantinuum will receive up to $100 million from the Commerce Department to scale its trapped-ion quantum computers. In turn, the department will receive a minority equity stake in the company.

"To have the support and validation of the U.S. government is important, " Hazra said. "And we think that makes the U.S. government, on the long term, a good steward of this area of technology, being invested in it and getting returns from it."

Last year, Barron's was the first to report that Honeywell was aiming to take the company public sometime between the end of 2026 and 2027, market conditions permitting. In addition to arriving ahead of schedule, the IPO establishes Quantinuum as the first quantum pure-play in history to opt for a traditional offering.

Newly listed peers Infleqtion, Xanadu Quantum Technologies, and Horizon Quantum followed the industry's historical blueprint of using blank-check mergers as a quicker, more accessible route to the public market. Quantinuum can afford the rigorous IPO process thanks to Honeywell's substantial backing.

"We see this as a long game," Hazra explained. "With respect to the transparency we can provide as part of our credibility and the investor base that we can attract, we've always thought a traditional IPO was the right path."

Honeywell's patience and capital have also granted Quantinuum a rare commodity in the quantum sector: time. Instead of racing to commercialize premature technology, the company has been able to focus on refining its flagship trapped-ion architecture.

The company's Helios system has achieved a two-qubit gate fidelity of 99.921% alongside single-qubit fidelity of 99.9975%. Fidelity is a measure of quality that gauges how closely an actual quantum state or operation matches a target. The system boasts a physical-to-logical qubit ratio of 2:1, signaling a highly efficient error-correction code that bodes well for scaling to larger systems.

Of course, an investment in quantum comes with the usual disclaimers. Ahead of broader commercialization, pure-play quantum companies rely on a concentrated base of early adopters. None of the companies are profitable and all will continue to post losses for the foreseeable future.

By the same token, the IPO presents an attractive entry point. Investors have a chance to buy into a technical leader that consistently hits or accelerates its deployment targets. Better yet, Quantinuum has the backing of big names like Nvidia and Amgen.

It's just as consequential for Honeywell. The carve-out is part of a broader effort to dismantle its sprawling conglomerate structure and strip away operational distractions. Honeywell is expected to retain a majority stake in Quantinuum as well as voting rights after the IPO.

Write to Mackenzie Tatananni at mackenzie.tatananni@barrons.com

This content was created by Barron's, which is operated by Dow Jones & Co. Barron's is published independently from Dow Jones Newswires and The Wall Street Journal.

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June 04, 2026 13:41 ET (17:41 GMT)

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