Company lists · Data verified August 2026

Top 25 Cybersecurity consulting companies based in the United Kingdom

Name: Cybersecurity consulting companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 1,836 companies tracked

There are 1,836 cybersecurity consulting companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 22,779 professional contacts across them, including 9,034 with verified work emails and 2,386 with mobile numbers. London is the largest hub.

This list covers cybersecurity consulting 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. Data current as of August 28, 2026.

1,836Companies

22,779Contacts tracked

9,034Verified emails

2,386Mobile numbers

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The 25 largest cybersecurity consulting companies based in the United Kingdom

Ranked by team size

Top 25 of 1,836 cybersecurity consulting companies based in the United Kingdom, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Sophos	Abingdon	5,001-10,000	4,963	2,711
2	SISA	Leicester	201-500	739	253
3	Everfox	London	1,001-5,000	635	13
4	Withsecure	London	501-1,000	614	329
5	Bridewell	Edinburgh	201-500	304	189
6	Quorum Cyber	Edinburgh	201-500	292	177
7	The Redesign Group	London	201-500	201	140
8	Intragen	London	201-500	188	128
9	Exclusive Networks UK	Mansfield	201-500	168	118
10	Cyberfort	Thatcham	51-200	160	88
11	LOGIQ	Bristol	201-500	142	81
12	Cybersec Consulting	London	201-500	141	76
13	CCL Solutions Group	Stratford Upon Avon	51-200	136	68
14	Cipher سايڤر	London	201-500	135	50
15	Trpglobal	London	51-200	123	36
16	Integrity360 International	London	501-1,000	120	25
17	Bulletproof Cyber Security	London	51-200	118	75
18	Oryxalign	London	51-200	99	67
19	Cyberone	London	51-200	96	39
20	Wavenet Cyberguard	London	201-500	86	58
21	Cybersmart	London	51-200	83	55
22	Reliance Cyber	Waterloo	51-200	80	47
23	URM	Reading	51-200	80	38
24	Bluecube Technology Solutions	Milton Keynes	201-500	73	39
25	TDI Tetrad Digital Integrity	Windsor	51-200	71	39

Showing 25 of 1,836 cybersecurity consulting companies based in the United Kingdom

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Cybersecurity consulting companies based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 724 HQs

2,386Contacts with mobile numbers

18Emails re-verified in last 30 days

Companies by employee count

1-10

1,180

11-50

472

51-200

122

201-500

501-1,000

1,001-5,000

5,001-10,000

Cybersecurity consulting companies by metro

Metro	Companies
Cybersecurity consulting companies in London	724
Cybersecurity consulting companies in Manchester	61
Cybersecurity consulting companies in Birmingham	32
Cybersecurity consulting companies in Cheltenham	28
Cybersecurity consulting companies in Leeds	23
Cybersecurity consulting companies in Cambridge	20
Cybersecurity consulting companies in Bristol	19

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “cybersecurity consulting companies”, with match quality audited by blind human judging, and headquartered in the United Kingdom.
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: Contact records re-verify on a rolling cadence; 18 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many cybersecurity consulting companies are there based in the United Kingdom?

There are 1,836 cybersecurity consulting companies headquartered in the United Kingdom as of August 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 consulting companies?

London leads with 724 headquartered companies, followed by Manchester (61) and Birmingham (32).

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 9,034 verified decision-maker contacts tracked across these 1,836 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 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.