Company lists · Data verified August 2026

Top 25 Cybersecurity support companies based in the United Kingdom

Name: Cybersecurity support 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 1,791 companies tracked

There are 1,791 cybersecurity support companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 25,406 professional contacts across them, including 10,053 with verified work emails and 2,635 with mobile numbers. London is the largest hub.

This list covers cybersecurity support 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.

1,791Companies

25,406Contacts tracked

10,053Verified emails

2,635Mobile numbers

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The 25 largest cybersecurity support companies based in the United Kingdom

Ranked by team size

Top 25 of 1,791 cybersecurity support 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	Bridewell	Edinburgh	201-500	304	189
8	Quorum Cyber	Edinburgh	201-500	292	177
9	ROC Technologies	n/a	201-500	245	120
10	The Redesign Group	London	201-500	201	140
11	Qualcom	Newtownabbey	51-200	181	36
12	Exclusive Networks UK	Mansfield	201-500	168	118
13	Cyberfort	Thatcham	51-200	160	88
14	LOGIQ	Bristol	201-500	142	81
15	Cybersec Consulting	London	201-500	141	76
16	CCL Solutions Group	Stratford Upon Avon	51-200	136	68
17	Cipher سايڤر	London	201-500	135	50
18	Oryxalign	London	51-200	99	67
19	Cybersrc Consultancy	London	51-200	99	39
20	Caretower An Integrity360 Company	London	201-500	97	12
21	Cyberone	London	51-200	96	39
22	Wavenet Cyberguard	London	201-500	86	58
23	Cybersmart	London	51-200	83	55
24	Reliance Cyber	Waterloo	51-200	80	47
25	Virtual IT LTD	Laindon	51-200	79	51

Showing 25 of 1,791 cybersecurity support companies based in the United Kingdom

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Cybersecurity support companies based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 653 HQs

2,635Contacts with mobile numbers

18Emails re-verified in last 30 days

Companies by employee count

1-10

1,105

11-50

507

51-200

116

201-500

501-1,000

1,001-5,000

5,001-10,000

Cybersecurity support companies by metro

Metro	Companies
Cybersecurity support companies in London	653
Cybersecurity support companies in Manchester	62
Cybersecurity support companies in Birmingham	28
Cybersecurity support companies in Cheltenham	27
Cybersecurity support companies in Leeds	17
Cybersecurity support companies in Cambridge	16
Cybersecurity support companies in Bristol	16

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 support 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 support companies are there based in the United Kingdom?

There are 1,791 cybersecurity support 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 support companies?

London leads with 653 headquartered companies, followed by Manchester (62) and Birmingham (28).

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 10,053 verified decision-maker contacts tracked across these 1,791 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.