By Mackenzie Tatananni

Quantinuum is set to make the biggest trading debut for any quantum company this year. As anticipation rises, the company is upsizing its initial public offering to as much as $1.46 billion.

Quantinuum indicated Monday that it plans to offer 26.5 million shares at prices ranging from $53 to $55 each, compared with earlier plans to sell roughly 21 million shares for $45 to $50 each. At the top of the updated range, the company would have a market value of $14.3 billion.

The filing also indicates Quantinuum could begin trading later this week. Shares will be listed on the Nasdaq Global Market under the ticker symbol "QNT."

Quantinuum is one of the newest entrants in the space, formed in 2021 through the merger of Honeywell International's quantum division and a U.K.-based start-up called Cambridge Quantum. Honeywell remains the largest shareholder and is slated to retain a majority stake and voting rights after the IPO.

A federal funding announcement last month brought renewed focus to Quantinuum, as one of only a handful of companies to win the support. Under the terms of a tentative agreement with the Commerce Department, Quantinuum is set to receive $100 million to advance the development of its trapped-ion quantum computers.

The news has been a boon to quantum stocks lately. Although those gains were fading on Monday, International Business Machines continued to rally. Big Blue is set to receive the lion's share of government funding, including a $1 billion commitment from the Commerce Department to create a standalone quantum foundry called Anderon.

Although smaller and newer than IBM, Quantinuum is nonetheless a rising quantum superpower. The company owes its reputation to its highly performant technology and an international footprint spanning the U.S., U.K., Singapore, and Japan.

Quantinuum is more than the largest quantum company to go public this year -- it's set to become the second-largest quantum player in the entire public market. IonQ currently has the highest valuation at nearly $27 billion, followed by D-Wave Quantum at $11 billion.

The projected market value north of $14 billion far exceeds any other public debut so far this year. Xanadu Quantum Technologies and Infleqtion were valued at $4.8 billion and $3.5 billion, respectively, on Monday, while Horizon Quantum had yet to touch $1 billion.

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

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June 01, 2026 11:07 ET (15:07 GMT)

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