Company lists · Data refreshed September 2026
Top 25 Network security consultants based in the United Kingdom
RevenueBase identified 1,443 network security consultants headquartered in the United Kingdom as of September 2026 and tracks 19,899 professional contacts across them, including 8,298 with verified work emails and 2,068 with mobile numbers. London is the largest hub.
This list covers network security consultants 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 network security consultants based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 4,925 | ||||
“Sophos is a cybersecurity leader defending organizations globally with an AI-driven platform and expert-led services.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | 764 | ||||
“MTI provides award-winning, end-to-end technology solutions and services in cyber security and data centre for over 35 years.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | 502 | ||||
“SecurityHQ, a global cybersecurity company pioneering Security Performance Engineering for stronger operational performance and resilience.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | Reliance InfosystemsIndirect evidence | 326 | |||
“As our name suggests, our customers rely on us in providing suitable technology inputs to support their business goals.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | 303 | ||||
“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 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | 297 | ||||
“At Quorum Cyber, we're on a mission to help good people win.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | 260 | ||||
“We are a global boutique, specializing exclusively in the convergence of identity-driven security and networking.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | 242 | ||||
“Obrela Security Industries is a global provider of cyber security services.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | 178 | ||||
“24 x 7 Cloud Service Provider & Managed Security Service Provider delivering technology transformation.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | 168 | ||||
“Sapphire delivers comprehensive cyber solutions tailored to your needs, spanning across consultancy, managed services, IT/OT and beyond.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | 165 | ||||
“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 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | 165 | ||||
“FourNet transforms the customer and citizen services people rely on every day.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | 159 | ||||
“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 5, 2026Thanks. The Data Team will review it. | |||||
| 14 | 156 | ||||
“Performanta is a global cybersecurity and data risk management company dedicated to protecting people where data matters most.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | 143 | ||||
“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 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | 126 | ||||
“We are TRPGLOBAL, your strategic partner in helping you with the complexities of risk management.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | 125 | ||||
“KHIPU Networks is an award winning international Cyber Security Company delivering a wide range of network, wireless and security solutions, technologies and services across…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 18 | 123 | ||||
“Bulletproof is now part of WorkNest Secure.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 19 | 105 | ||||
“Cybersecurity specialists providing technology and telecoms solutions that gives you the leadership, experience and resilience you need to build and secure the future of work.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | 99 | ||||
“OryxAlign creates true alignment that delivers the right outcomes for all.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 21 | 97 | ||||
“As an independent IT security specialist, Caretower provide comprehensive solutions to individual problems, thus allowing our recommendations to be unbiased.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 22 | 93 | ||||
“ramsac provide so much more than just IT support.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 23 | 87 | ||||
“ITC Secure is an advisory-led cyber security services company.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 24 | 86 | ||||
“CyberGuard Technologies is the security division of Wavenet.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 25 | 85 | ||||
“Amethyst Risk Management is a leading cybersecurity consultancy supplying expert services and support to the UK Government, Defence, Operators of Essential Services, and the…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 1,443 network security consultants based in the United Kingdom
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Network security consultants 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 network security consultants, 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 “network security consultants”. 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 network security consultants, 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, 8,298 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.
Network security consultants by metro
Frequently asked
How many network security consultants are there based in the United Kingdom?
RevenueBase identified 1,443 network security consultants 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?
Sophos, headquartered in Abingdon, tops this list with the largest team on record.
Which city has the most network security consultants?
London leads with 528 headquartered companies, followed by Manchester (59) and Birmingham (29).
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 8,298 verified decision-maker contacts tracked across these 1,443 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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