The UK is home to a fast-growing quantum technology ecosystem, spanning quantum computing, post-quantum cryptography, sensing and advanced materials. Using Beauhurst data, we’ve ranked the top 50 quantum companies in the UK by the total amount of equity funding they’ve raised.
UK quantum companies have raised £1.73b in equity funding to date. In the first half of 2026 alone, they secured £587m across 23 deals—more than in 2024 and 2025 combined.
This isn’t a ranking of the UK’s largest technology businesses by revenue, valuation or headcount. Instead, it highlights the quantum companies that have attracted the most equity investment—and what the data tells us about the wider UK quantum sector.
The UK quantum sector
Quantum technology uses the behaviour of matter at subatomic scale—including properties such as superposition and entanglement—to process, transmit and measure information in ways classical technology cannot.
Some UK companies are building quantum computers themselves. Others are developing the software and security infrastructure around them, or applying quantum effects to real-world measurement and manufacturing problems.
Broadly, they fall into three areas:
- Quantum computing hardware and software: Superconducting, silicon, trapped-ion, and photonic systems, along with the error correction and control software they depend on.
- Post-quantum cryptography: Encryption, key distribution, and random number generation designed to withstand quantum-capable adversaries.
- Quantum sensing and materials: Measurement, imaging, and manufacturing technologies that apply quantum principles to industrial and environmental problems.
Beauhurst tracks 322 active quantum companies in the UK, up from 58 in the final quarter of 2015. That is growth of 455% over the decade, one of the highest rates we have measured in any sector.
Together these companies generated £2.54b in turnover according to their latest filed accounts, and support an estimated 12,172 employees.
Some 92% of all quantum equity funding tracked by Beauhurst has arrived since the start of 2020.
Quantum funding in the UK
UK quantum companies have raised £1.73b in equity funding to date.
Oxford Quantum Circuits leads the ranking with £380m. The South East superconducting computer developer closed a £260m Series C in June 2026, the largest private quantum computing round ever raised in Europe, and accounts for 22% of all UK quantum equity on its own.
Behavox (£283m) follows, a London compliance and surveillance AI business, ahead of Exohood Labs (£232m) in research and development services, Quantum Motion (£177m) in silicon qubits, and Riverlane (£91.3m) in quantum error correction.
Funding is highly concentrated. The top five companies account for 67% of all UK quantum equity raised, reflecting the capital intensity of quantum hardware and the small number of teams able to build it.
The top 25 companies have raised £1.65b between them, or 95% of the sector total.
Where are the UK’s quantum companies?
The top 25 spans eight UK regions.
London leads with 11 companies, followed by the South East with seven and the East of England with two. Wales, the South West, the Highlands and Islands, the North West, and Yorkshire and the Humber each have one.
University clusters account for much of that distribution. The Oxford cluster contributes seven companies to the top 25, including Oxford Quantum Circuits, Oxford Ionics, PQShield, Universal Quantum, EnSilica, Opsydia, and Quantum Dice. The Cambridge cluster adds Riverlane and Nu Quantum.
Between them, those two clusters account for nine of the top 25, a reminder of how much of the sector originates in university research.
Quantum companies by stage of growth
The sector is young, and the ranking reflects that.
Within the top 25, venture-stage businesses are the largest group with 14 entries, followed by growth with seven, established with two, and seed with one. One company has exited: Cambridge Quantum Computing, which merged with Honeywell Quantum Solutions in 2021 to form Quantinuum.
Across the wider staged universe of 92 companies, there are zero dead and zero zombie businesses. Alongside precision agriculture, quantum is the only sector in our series with no failed companies at all.
That reflects the patient deep-tech capital funding the sector, rather than a technology that has proven itself commercially.
