UK-founded quantum leader Quantinuum, majority-owned by Honeywell, has raised $600 million at a $10 billion valuation. The round brought in new backers including Nvidia’s NVentures, Quanta Computer, and QED, joining existing investors such as JPMorgan, Mitsui, Amgen, and Honeywell.

Funding will accelerate the launch of Helios, its next-generation quantum system expected this year, and advance work toward fault-tolerant quantum computing — widely seen as the sector’s holy grail. Quantinuum also positions itself as a full-stack provider with top-tier performance benchmarks.

The company is partnering with Nvidia through the Accelerated Quantum Research Centre, while expanding collaborations that integrate quantum and AI. It has also teamed up with Riken, SoftBank, Infineon, and the STFC Hartree Centre, alongside global expansions into New Mexico, Qatar, and Singapore. Its Qatari joint venture forms part of a $1 billion national quantum strategy.

Founded in 2014 as Cambridge Quantum by Ilyas Khan, Quantinuum employs 630 staff, including 370 scientists and engineers, across four countries. The raise highlights surging investor appetite for quantum computing, following Finland’s IQM $320M Series B — the largest outside the U.S.