Company lists · Data refreshed September 2026
Top 25 Quantum software companies based in the United Kingdom
RevenueBase identified 67 quantum software companies headquartered in the United Kingdom as of September 2026 and tracks 1,023 professional contacts across them, including 538 with verified work emails and 75 with mobile numbers. London is the largest hub.
This list covers quantum software companies headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, how directly it supports the match, and when it was last checked. Data refreshed September 5, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest quantum software companies based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | Oxford Quantum Circuits OQCPartial evidence | 146 | |||
“Quantum computing is poised to reshape our world by addressing the complex challenges we face today.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | RiverlanePartial evidence | 144 | |||
“The fragility of qubits means today's quantum computers fail under an avalanche of data errors long before they reach utility-scale.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | Oxford IonicsPartial evidence | 87 | |||
“The future is quantum.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | Universal QuantumPartial evidence | 87 | |||
“A quantum computer harnesses the fundamental forces that govern the physical world.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | PhasecraftPartial evidence | 44 | |||
“Phasecraft is the quantum algorithms company.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | Orca ComputingPartial evidence | 40 | |||
“ORCA Computing develops full-stack photonic quantum computers with the aim of unlocking new fields of applications and helping transform industries.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | Quantum BasePartial evidence | 31 | |||
“Quantum Base is a world leader in the field of Quantum Security.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | 29 | ||||
“Cambridge Quantum (CQ), part of Quantinuum, is a quantum computing software and algorithms company, and in essence we solve one critical problem – to allow our customers to get…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | MOTHPartial evidence | 25 | |||
“Moth is a technology company building the next era of Media and Entertainment by delivering consumer products and services powered by quantum computing.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | 23 | ||||
“Aegiq is a UK based full-stack photonic quantum computing company.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | 21 | ||||
“Aquark Technologies builds and delivers the world's smallest and most deployable cold atom quantum hardware to enhance navigation, communications, security, and our understanding…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | Kelvin Nanotechnology LTDPartial evidence | 18 | |||
“Kelvin Nanotechnology are an internationally recognised provider of Advanced Photonics and Quantum Components.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | Quantum Software LABStrong evidence | 13 | |||
“The Quantum Software Lab, in collaboration with the National Quantum Computing Centre (NQCC) and based in the School of Informatics, will identify key challenges in the adoption…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 14 | Quantum ExponentialPartial evidence | 10 | |||
“Quantum Exponential’s team of finance professionals, entrepreneurs and Quantum scientists is building a world leading portfolio of high-potential quantum technology companies.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | TREQPartial evidence | 10 | |||
“We’re leading a quantum computing expedition to blaze the trail from prototypes to next-gen computing.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | 8 | ||||
“Crypta Labs is a cyber security company developing Quantum seeded random number generator designs specifically aimed at the security OEM hardware manufacturer sector.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | Quantum FuturesPartial evidence | 7 | |||
“HELPING SHAPE THE FUTURE OF QUANTUM” Our mission is simple; to help quantum computing companies across the globe grow and scale through the acquisition of the right talent at the…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 18 | QuentanglePartial evidence | 7 | |||
“We are a team of experienced computer scientists and physicists in the field of quantum computing and quantum communication with a significant number of peer-reviewed publications…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 19 | Spin Quantum TechIndirect evidence | 7 | |||
“Want to accelerate and empower your business to solve digital challenges faster and better?” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | QFXPartial evidence | 6 | |||
“Focussing on trapped ions to deliver scalable products for quantum computing, communication, and sensing, fostering innovation and excellence through superior product quality…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 21 | Zaiku Group LTDIndirect evidence | 6 | |||
“Zaiku Group is a collaborative Deep-tech R&D commercial venture on a mission to bring together talented people in mathematics and deep science.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 22 | QuantopticonStrong evidence | 5 | |||
“We are the makers of Quantillion: a first-of-its-kind automated software platform for the development of optimised quantum photonic components and systems.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 23 | 3 | ||||
“2xN is a quantum-inspired early-stage VC fund.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 24 | QAI TalentPartial evidence | 2 | |||
“QAi Talent helps organisations design, build, and scale the specialist teams needed to lead in quantum and quantum‑adjacent technologies.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 25 | QuantumpediaPartial evidence | 2 | |||
“Quantumpedia is an online platform specialising in quantum technologies.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 67 quantum software companies based in the United Kingdom
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Quantum software companies based in the United Kingdom at a glance
As of Sep 5, 2026Companies by employee count
Verified emails by last verification
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among quantum software companies, so some rows will be adjacent to the category rather than pure plays. The description and evidence rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the United Kingdom whose own description of what they do matches “quantum software companies”. Matching reads each company's description, not its industry code or its name.
- What we exclude
- Companies whose own description does not clearly place them among quantum software companies, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and an evidence rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 538 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 5, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Quantum software companies by metro
- Quantum software companies in London29
Frequently asked
How many quantum software companies are there based in the United Kingdom?
RevenueBase identified 67 quantum software companies headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Oxford Quantum Circuits OQC, headquartered in Shinfield, tops this list with the largest team on record.
Which city has the most quantum software companies?
London leads with 29 headquartered companies, followed by Cambridge (6) and Glasgow (4).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 538 verified decision-maker contacts tracked across these 67 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 5, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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