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.

2,260Companies
30,008Contacts tracked
11,577Verified emails
2,880Mobile numbers
Unlock all 2,260 companies Free account · no credit card · 2 minutes

The 25 largest cybersecurity consultancy companies based in the United Kingdom

Ranked by team size
Top 25 of 2,260 cybersecurity consultancy companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 1, 2026. Evidence rates how directly each company's own description names cybersecurity consultancy companies: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#CompanyHeadquartersEmployeesContactsVerified emails
1
SophosPartial evidence

“Sophos is a cybersecurity leader defending organizations globally with an AI-driven platform and expert-led services.”

Source: company website · checked Sep 1, 2026
Abingdon, United Kingdom5,001-10,0004,9632,711
2
ZerofoxIndirect evidence

“ZeroFox is the solution to discover, validate, and disrupt external cyber threats before they harm revenue or reputation.”

Source: company website · checked Sep 1, 2026
United Kingdom501-1,000894382
3
SISAPartial evidence

“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, 2026
Leicester, United Kingdom201-500739253
4
EverfoxIndirect evidence

“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, 2026
London, United Kingdom1,001-5,00063513
5
MASSIndirect evidence

“MASS, part of the Cohort plc group, helps you realise the value of your data.”

Source: company website · checked Sep 1, 2026
Lincoln, United Kingdom201-500633203
6
WithsecurePartial evidence

“WithSecure™ is Europe's cybersecurity partner of choice.”

Source: company website · checked Sep 1, 2026
London, United Kingdom501-1,000614329
7
Integrity360Indirect evidence

“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, 2026
London, United Kingdom501-1,000341199
8
BridewellIndirect evidence

“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, 2026
Edinburgh, United Kingdom201-500304189
9
Quorum CyberIndirect evidence

“At Quorum Cyber, we're on a mission to help good people win.”

Source: company website · checked Sep 1, 2026
Edinburgh, United Kingdom201-500292177
10
ROC TechnologiesIndirect evidence

“Roc Technologies delivers transformational IT solutions to public and private sector organisations across the UK.”

Source: company website · checked Sep 1, 2026
United Kingdom201-500245120
11
WaterstonsIndirect evidence

“We are an IT business with a difference.”

Source: company website · checked Sep 1, 2026
Durham, United Kingdom201-500223157
12
The Redesign GroupPartial evidence

“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, 2026
London, United Kingdom201-500201140
13
IntragenIndirect evidence

“Intragen is a cyber security business focused on managed Identity solutions and services.”

Source: company website · checked Sep 1, 2026
London, United Kingdom201-500188128
14
Ibridge, LLCIndirect evidence

“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, 2026
London, United Kingdom501-1,00018335
15
FournetIndirect evidence

“FourNet transforms the customer and citizen services people rely on every day.”

Source: company website · checked Sep 1, 2026
Derby, United Kingdom201-500173115
16

“Ensuring your business is handling cyber security risks effectively has never been more important.”

Source: company website · checked Sep 1, 2026
London, United Kingdom51-20016962
17
Exclusive Networks UKPartial evidence

“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, 2026
Mansfield, United Kingdom201-500168118
18
CyberfortIndirect evidence

“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, 2026
Thatcham, United Kingdom51-20016088
19
LOGIQPartial evidence

“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, 2026
Bristol, United Kingdom201-50014281
20
Cybersec ConsultingIndirect evidence

“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, 2026
London, United Kingdom201-50014176
21
Cipher سايڤرPartial evidence

“At Cipher, we're redefining digital security as the premier cybersecurity leader in the Middle East.”

Source: company website · checked Sep 1, 2026
London, United Kingdom201-50013550
22
TrpglobalIndirect evidence

“We are TRPGLOBAL, your strategic partner in helping you with the complexities of risk management.”

Source: company website · checked Sep 1, 2026
London, United Kingdom51-20012336
23
Friend MTSPartial evidence

“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, 2026
Manchester, United Kingdom51-20011882
24
Cybersrc ConsultancyIndirect evidence

“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, 2026
London, United Kingdom51-2009939
25
CyberoneIndirect evidence

“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, 2026
London, United Kingdom51-2009639

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, 2026
1-10Median size (employees)
LondonLargest hub · 861 HQs
2,880Contacts with mobile numbers
Sep 1, 2026Data refreshed

Companies by employee count

1-10
1,442
11-50
595
51-200
147
201-500
33
501-1,000
11
1,001-5,000
7
5,001-10,000
2

Cybersecurity consultancy companies by metro

MetroCompanies
Cybersecurity consultancy companies in London861
Cybersecurity consultancy companies in Manchester67
Cybersecurity consultancy companies in Birmingham37
Cybersecurity consultancy companies in Cheltenham32
Cybersecurity consultancy companies in Leeds27
Cybersecurity consultancy companies in Cambridge26
Cybersecurity consultancy companies in Bristol21

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.