Oxford Quantum Circuits has closed a £260 million Series C funding round, making it the largest private capital raise for a quantum computing company in Europe. The Oxford-based firm, which designs superconducting quantum computers built for deployment within commercial data centres, said the round was oversubscribed. J.P. Morgan acted as exclusive placement agent.

The raise positions OQC among the most heavily capitalised private quantum computing firms in the world. Founded as a spinout of the University of Oxford, the company already operates quantum systems across the UK, United States, Japan, and Spain, serving enterprise and government clients in financial services, defence, and national security. Proceeds will fund accelerated expansion of that platform and advance OQC's hardware roadmap toward fault-tolerant quantum systems capable of commercial-scale deployment.

Bullhound Capital led the round. Per Roman, the firm's founding partner, will join OQC's board. The investor consortium included a range of institutional, state-backed, and academic participants: the British Business Bank, COFIDES of Spain, and Fynveur provided public-sector capital, while Rokos Capital Management, Alpha Edison, Fulcrum Asset Management, Pentland Ventures, Adaptive Capital Partners, Firgun Ventures, 18 West, and Oxford Capital contributed from the private sector. Magdalen College Oxford joined existing backers Oxford Science Enterprises, SBI, Chevron Technology Ventures, and the University of Tokyo Edge Capital Partners.

Chief executive Gerald Mullally described the fundraise as a coming-of-age moment for the company and for British quantum computing more broadly. Founder and chief science officer Dr Peter Leek framed it as evidence of a broader shift in how investors now perceive the sector. OQC's architecture, which allows quantum processors to be integrated directly into trusted data-centre environments rather than requiring dedicated infrastructure, has been cited by backers including Barclays and J.P. Morgan as addressing one of the field's persistent commercial bottlenecks: the difficulty of scaling reliable quantum hardware into environments where enterprise and government clients already operate.

Chancellor Rachel Reeves and Science Minister Lord Vallance both welcomed the raise as a signal of the United Kingdom's competitive position in deep technology. The investment aligns with a government commitment of up to £2 billion to help domestic quantum companies reach global commercial scale. The British Business Bank, one of the round's investors, described the closure as fulfilling a national economic imperative to pair British scientific capability with capital sufficient to support global expansion.

OQC's focus on data-centre integration distinguishes it from quantum computing firms that have pursued standalone or cloud-only approaches. The company's systems are currently deployed in active commercial environments, and the Series C is intended to deepen those deployments while extending OQC's reach into new markets. No specific targets for additional deployment regions were announced at the time of the close.

The round reflects sustained institutional appetite for quantum computing ventures that can demonstrate a credible path to infrastructure integration rather than laboratory performance alone. Whether OQC's superconducting architecture can deliver the fault tolerance required for the most demanding enterprise applications remains the central technical question facing the firm and the sector. The funding gives the company considerable runway to address it.

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