Oxford Quantum Circuits, known as OQC, announced on June 3, 2026, that it had closed an oversubscribed £260 million Series C round, a sum it also gave as $350 million. A Series C is usually a company’s third lettered round of venture funding, after its A and B rounds.
Bullhound Capital led the round. Per Roman, founding partner of Bullhound Capital, is joining OQC’s board. OQC said it will use the funding to “expand OQC’s operational presence in priority markets” and to speed up its roadmap toward commercially useful, fault-tolerant quantum computers, machines that detect and correct their own errors as they run.
The government-owned British Business Bank committed £100 million and said it was backing OQC as the company develops TITAN, which SiliconANGLE reported was expected to launch in 2028 with 200 logical qubits. A logical qubit is a unit of quantum information protected against errors by encoding.
OQC called the round “Europe’s largest ever private funding round for a quantum computing company” in its announcement. The British Business Bank, in its own release, called it one of Europe’s largest ever funding rounds for a quantum computing company.
Investors
OQC said the round included investment from the British Business Bank, COFIDES, Oxford Capital, Alpha Edison, Fulcrum Asset Management, Pentland Ventures, Magdalen College Oxford, Adaptive Capital Partners, Firgun Ventures, and 18 West. Fynveur, advised by Invus, and RCM Private Markets Fund, managed by Rokos Capital Management, also invested. Existing investors OTIF Ventures, Oxford Science Enterprises, SBI, the University of Tokyo Edge Capital Partners, and Chevron Technology Ventures took part as well.
J.P. Morgan acted as exclusive placement agent for the round.
The British Business Bank said it had invested £7 million in OQC’s Series A round in 2022. In OQC’s announcement, George Mills, a senior investment director at the bank, tied the bank’s new commitment to the development of TITAN.
Rachel Reeves, the chancellor of the exchequer, called the Series C round “a major vote of confidence in the UK’s quantum sector” in OQC’s announcement. She cited the government’s recent commitment of up to £2 billion to help UK quantum companies reach commercial scale.
Deployments and roadmap
OQC, a maker of superconducting quantum computers, said it has systems deployed in the UK, Japan, Spain, and the United States. It said its systems are designed for data centers serving enterprise and government customers.
When OQC published its roadmap in June 2025, it set a target of 50,000 logical qubits by 2034, The Quantum Insider reported. In most error-correction schemes, each logical qubit is spread across many physical qubits.
OQC announced research on its Dimon qubit the same month, alongside a preprint by three authors. They reported error-detected measurements on three devices, each a single dual-rail qubit. In error detection, a system flags some errors but does not correct them.
Bit-flip and phase-flip errors are the two basic kinds of qubit error. The authors reported logical error rates for both “more than one order of magnitude lower” than the physical error rates.
Update, November 13, 2026: OQC’s roadmap page now lists TITAN, with 200 logical qubits, for 2028–2030 and ATLAS, with 50,000 logical qubits, for 2035 onward.
