Illyas Khan's Quantinuum IPO turns a quantum software bet into a $2.2 billion stake

Why it matters

Quantinuum's IPO is a founder exit and a market signal: public investors are funding quantum like strategic infrastructure despite limited revenue.

Illyas Khan became a billionaire after Quantinuum's Nasdaq IPO, a public-market validation of a founder path that began in Hong Kong finance, moved through an early accelerator, and ended up inside one of the most capital-intensive bets in computing.

Forbes reported that Quantinuum raised $1.68 billion by selling 28 million shares at $60 each on June 3, valuing the Honeywell-backed quantum computing business at more than $15.6 billion. The shares opened at $58 on June 9. Khan owns around 15% of Quantinuum, a stake Forbes valued at $2.2 billion.

The offering gives Quantinuum the largest public listing yet for a quantum computing startup, according to Forbes. It also gives Khan a liquid-market benchmark for a company whose financial profile still looks more like a research institution than a mature software or hardware business: $30.9 million of revenue last year against a $192 million loss, with Japan's Riken research institute and the U.S. government accounting for the bulk of revenue, Forbes reported.

Khan's unusual route into quantum

Khan is not the obvious archetype for a deep-tech founder. Forbes describes him as British-born and reports that he worked at Schroders and Nomura in Hong Kong in the 1990s before founding Tech Pacific, an early startup accelerator that went public on the Hong Kong Stock Exchange in 2000.

His quantum turn came later. Khan founded Cambridge Quantum Computing, a software company for quantum computers, and wrote for SOAS World that he was inspired after meeting Stephen Hawking in 2013. He later became chairman of Hawking's foundation, according to Forbes.

That background matters because Quantinuum is not simply another physics lab trying to commercialize a machine. Its origin story is a merger between Khan's software bet and industrial hardware built inside Honeywell. In 2021, Cambridge Quantum Computing combined with Honeywell's quantum unit in Broomfield, Colorado. Honeywell had previously backed Khan's business and invested $300 million as part of the merger, after which Khan became chief product officer and vice chairman of the combined Quantinuum.

Honeywell's contribution was trapped-ion hardware, a design that uses ions held in place with lasers to run computations rather than silicon chips. Khan's contribution was the software layer and the commercial bridge between quantum research and customers willing to pay before quantum machines are broadly useful.

Public money is buying time

The IPO does not settle the commercial question around quantum computing. It finances the race.

Quantinuum is going public into a market that has rewarded quantum exposure before quantum revenue has caught up. Forbes noted that Pasqal, Infleqtion and Xanadu listed through blank-check mergers over the past year, while Rigetti Computing and D-Wave saw large share-price runups tied to investor enthusiasm around artificial intelligence and the idea that quantum systems could unlock new scientific discovery.

Quantinuum's numbers show the gap between that market narrative and current demand. A valuation above $15.6 billion on $30.9 million of reported 2025 revenue is not a conventional revenue multiple story. Public investors are underwriting technical progress, government demand, and the possibility that quantum computing becomes strategic infrastructure.

That last point is why the timing is not only about the IPO market. In May, Quantinuum was named by Axios as one of nine quantum-related startups in a Trump administration plan to award $2 billion in grants and take equity stakes. Forbes reported that IBM and GlobalFoundries were set to receive the bulk of that funding. The terms and amount for Quantinuum were not established in the supplied reporting.

The national-security case for quantum has sharpened as cryptography risk moved from abstract concern to policy planning. Forbes cited a Guardian report that Google warned in March that quantum computers could be capable of breaking encrypted systems used by banks and governments as early as 2029.

The exit is also a financing strategy

For Khan, the IPO is a founder liquidity milestone. For Quantinuum, it is a balance-sheet event.

Quantum computing demands long development cycles, specialist talent and hardware spending before there is a large commercial market. A $1.68 billion raise gives Quantinuum more room to operate without relying only on strategic backers, venture rounds or government programs. It also exposes Quantinuum to a public market that can be generous when it believes a platform shift is coming and unforgiving when revenue misses the story.

The public listing leaves the core test unchanged: Quantinuum has to turn a system built from Honeywell's trapped-ion hardware and Khan's software-first Cambridge Quantum thesis into a business that can support public-company expectations. The IPO made Khan a billionaire because investors accepted that possibility at a $15 billion-plus valuation. The next phase is whether Quantinuum can make the revenue line look less experimental than the technology.