Company lists · Data verified August 2026

Top 25 Cybersecurity services companies based in the United Kingdom

Name: Cybersecurity services 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 1,709 companies tracked

There are 1,709 cybersecurity services companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 25,810 professional contacts across them, including 10,347 with verified work emails and 2,770 with mobile numbers. London is the largest hub.

This list covers cybersecurity services 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.

1,709Companies

25,810Contacts tracked

10,347Verified emails

2,770Mobile numbers

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The 25 largest cybersecurity services companies based in the United Kingdom

Ranked by team size

Top 25 of 1,709 cybersecurity services 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	Zerofox	n/a	501-1,000	894	382
3	SISA	Leicester	201-500	739	253
4	Everfox	London	1,001-5,000	635	13
5	MASS	Lincoln	201-500	633	203
6	Withsecure	London	501-1,000	614	329
7	Integrity360	London	501-1,000	341	199
8	Bridewell	Edinburgh	201-500	304	189
9	Quorum Cyber	Edinburgh	201-500	292	177
10	Netcraft	London	201-500	206	105
11	The Redesign Group	London	201-500	201	140
12	Intragen	London	201-500	188	128
13	Ibridge, LLC	London	501-1,000	183	35
14	Fournet	Derby	201-500	173	115
15	Exclusive Networks UK	Mansfield	201-500	168	118
16	Cyberfort	Thatcham	51-200	160	88
17	LOGIQ	Bristol	201-500	142	81
18	Cybersec Consulting	London	201-500	141	76
19	CCL Solutions Group	Stratford Upon Avon	51-200	136	68
20	Cipher سايڤر	London	201-500	135	50
21	Friend MTS	Manchester	51-200	118	82
22	Bulletproof Cyber Security	London	51-200	118	75
23	Cybersrc Consultancy	London	51-200	99	39
24	Drawbridge	London	51-200	97	60
25	Cyberone	London	51-200	96	39

Showing 25 of 1,709 cybersecurity services companies based in the United Kingdom

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Cybersecurity services companies based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 679 HQs

2,770Contacts with mobile numbers

16Emails re-verified in last 30 days

Companies by employee count

1-10

1,039

11-50

481

51-200

124

201-500

501-1,000

1,001-5,000

5,001-10,000

Cybersecurity services companies by metro

Metro	Companies
Cybersecurity services companies in London	679
Cybersecurity services companies in Manchester	55
Cybersecurity services companies in Birmingham	29
Cybersecurity services companies in Cheltenham	26
Cybersecurity services companies in Leeds	19
Cybersecurity services companies in Cambridge	18
Cybersecurity services companies in Bristol	17

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 services 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; 16 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 services companies are there based in the United Kingdom?

There are 1,709 cybersecurity services 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 services companies?

London leads with 679 headquartered companies, followed by Manchester (55) 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 10,347 verified decision-maker contacts tracked across these 1,709 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.