Company lists · Data refreshed September 2026
Top 25 Cybersecurity consultancy companies based in the United Kingdom
There are 2,260 cybersecurity consultancy companies headquartered in the United Kingdom (RevenueBase, September 2026). RevenueBase tracks 30,008 professional contacts across them, including 11,577 with verified work emails and 2,880 with mobile numbers. London is the largest hub.
This list covers cybersecurity consultancy 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 1, 2026.
The 25 largest cybersecurity consultancy companies based in the United Kingdom
Ranked by team size| # | Company | Verified emails |
|---|---|---|
| 1 | “Sophos is a cybersecurity leader defending organizations globally with an AI-driven platform and expert-led services.” Source: company website · checked Sep 1, 2026Thanks. The Data Team will review it. | 2,711 |
| 2 | “ZeroFox is the solution to discover, validate, and disrupt external cyber threats before they harm revenue or reputation.” Source: company website · checked Sep 1, 2026Thanks. The Data Team will review it. | 382 |
| 3 | “SISA is a global forensics-driven cybersecurity solutions company, trusted by leading organizations for securing their businesses with robust preventive, detective, and corrective…” Source: company website · checked Sep 1, 2026Thanks. The Data Team will review it. | 253 |
| 4 | “Everfox delivers trusted connectivity to protect the world's most critical environments, safeguarding the sensitive information behind decision advantage.” Source: company website · checked Sep 1, 2026Thanks. The Data Team will review it. | 13 |
| 5 | “MASS, part of the Cohort plc group, helps you realise the value of your data.” Source: company website · checked Sep 1, 2026Thanks. The Data Team will review it. | 203 |
| 6 | “WithSecure™ is Europe's cybersecurity partner of choice.” Source: company website · checked Sep 1, 2026Thanks. The Data Team will review it. | 329 |
| 7 | “Integrity360 is a leading independent cyber security and PCI specialist operating across EMEA and North America, with offices spanning the UK and Ireland, Bulgaria, Italy, Sweden…” Source: company website · checked Sep 1, 2026Thanks. The Data Team will review it. | 199 |
| 8 | “Bridewell is the trusted cyber security partner for organisations operating within Critical National Infrastructure (CNI), as well as companies who want the highest standard of…” Source: company website · checked Sep 1, 2026Thanks. The Data Team will review it. | 189 |
| 9 | “At Quorum Cyber, we're on a mission to help good people win.” Source: company website · checked Sep 1, 2026Thanks. The Data Team will review it. | 177 |
| 10 | “Roc Technologies delivers transformational IT solutions to public and private sector organisations across the UK.” Source: company website · checked Sep 1, 2026Thanks. The Data Team will review it. | 120 |
| 11 | “We are an IT business with a difference.” Source: company website · checked Sep 1, 2026Thanks. The Data Team will review it. | 157 |
| 12 | “The Redesign Group is a global technology and cybersecurity consulting firm leveraging design thinking, interdependent subject matter expertise, and emerging technology solutions…” Source: company website · checked Sep 1, 2026Thanks. The Data Team will review it. | 140 |
| 13 | “Intragen is a cyber security business focused on managed Identity solutions and services.” Source: company website · checked Sep 1, 2026Thanks. The Data Team will review it. | 128 |
| 14 | “For over 16 years, iBridge has helped many organizations in the legal, healthcare, manufacturing, utilities, financial, and education industries apply the latest technologies to…” Source: company website · checked Sep 1, 2026Thanks. The Data Team will review it. | 35 |
| 15 | “FourNet transforms the customer and citizen services people rely on every day.” Source: company website · checked Sep 1, 2026Thanks. The Data Team will review it. | 115 |
| 16 | “Ensuring your business is handling cyber security risks effectively has never been more important.” Source: company website · checked Sep 1, 2026Thanks. The Data Team will review it. | 62 |
| 17 | “Exclusive Networks is a global trusted cybersecurity specialist for digital infrastructure helping to drive the transition to a totally trusted digital future for all people and…” Source: company website · checked Sep 1, 2026Thanks. The Data Team will review it. | 118 |
| 18 | “At Cyberfort we are passionate about the cyber security services we deliver for our customers which keeps their people, data, systems and technology infrastructure secure…” Source: company website · checked Sep 1, 2026Thanks. The Data Team will review it. | 88 |
| 19 | “Logiq is a UK-based cyber security consultancy and secure managed services provider supporting defence, government, and critical national infrastructure (CNI) organisations where…” Source: company website · checked Sep 1, 2026Thanks. The Data Team will review it. | 81 |
| 20 | “CyberSec Consulting, headquartered in the UAE and serving the iMETA market, is a distinguished professional Cyber Security and Consulting services company.” Source: company website · checked Sep 1, 2026Thanks. The Data Team will review it. | 76 |
| 21 | “At Cipher, we're redefining digital security as the premier cybersecurity leader in the Middle East.” Source: company website · checked Sep 1, 2026Thanks. The Data Team will review it. | 50 |
| 22 | “We are TRPGLOBAL, your strategic partner in helping you with the complexities of risk management.” Source: company website · checked Sep 1, 2026Thanks. The Data Team will review it. | 36 |
| 23 | “As the number one anti-piracy provider, Friend MTS is the trusted cybersecurity partner of the biggest brands in media, sports, and entertainment.” Source: company website · checked Sep 1, 2026Thanks. The Data Team will review it. | 82 |
| 24 | “CyberSRC® is a CERT-in empanelled award winning organization, positioned to provide cyber security, data protection and assurance services with integrated security solutions…” Source: company website · checked Sep 1, 2026Thanks. The Data Team will review it. | 39 |
| 25 | “CyberOne is a Microsoft Security Elite Partner and one of only 100 global Microsoft partners recognised with Microsoft-Verified Managed XDR solution status.” Source: company website · checked Sep 1, 2026Thanks. The Data Team will review it. | 39 |
Showing 25 of 2,260 cybersecurity consultancy companies based in the United Kingdom
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Cybersecurity consultancy companies based in the United Kingdom at a glance
As of Sep 1, 2026Companies by employee count
Cybersecurity consultancy companies by metro
| Metro | Companies |
|---|---|
| Cybersecurity consultancy companies in London | 861 |
| Cybersecurity consultancy companies in Manchester | 67 |
| Cybersecurity consultancy companies in Birmingham | 37 |
| Cybersecurity consultancy companies in Cheltenham | 32 |
| Cybersecurity consultancy companies in Leeds | 27 |
| Cybersecurity consultancy companies in Cambridge | 26 |
| Cybersecurity consultancy companies in Bristol | 21 |
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 cybersecurity consultancy 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: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
- What qualifies
- Companies headquartered in the United Kingdom whose own description of what they do matches “cybersecurity consultancy 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 cybersecurity consultancy 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.
- 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, 11,577 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 1, 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.
Frequently asked
How many cybersecurity consultancy companies are there based in the United Kingdom?
There are 2,260 cybersecurity consultancy companies headquartered in the United Kingdom as of September 2026 (RevenueBase).
What is the largest company on this list?
Sophos, headquartered in Abingdon, tops this list with the largest team on record.
Which city has the most cybersecurity consultancy companies?
London leads with 861 headquartered companies, followed by Manchester (67) and Birmingham (37).
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 11,577 verified decision-maker contacts tracked across these 2,260 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 1, 2026.
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About this data
RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.
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