Company lists · Data verified August 2026

Top 25 Enterprise cybersecurity companies based in the United Kingdom

Name: Enterprise cybersecurity 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 1,296 companies tracked

There are 1,296 enterprise cybersecurity companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 27,978 professional contacts across them, including 12,819 with verified work emails and 4,299 with mobile numbers. London is the largest hub.

This list covers enterprise cybersecurity 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.

1,296Companies

27,978Contacts tracked

12,819Verified emails

4,299Mobile numbers

Unlock all 1,296 companies Free account · no credit card · 2 minutes

The 25 largest enterprise cybersecurity companies based in the United Kingdom

Ranked by team size

Top 25 of 1,296 enterprise cybersecurity 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	Sailpoint	London	1,001-5,000	3,059	1,979
3	Darktrace	Cambridge	1,001-5,000	2,590	1,791
4	Zerofox	n/a	501-1,000	894	382
5	SISA	Leicester	201-500	739	253
6	Everfox	London	1,001-5,000	635	13
7	Withsecure	London	501-1,000	614	329
8	Bridewell	Edinburgh	201-500	304	189
9	Quorum Cyber	Edinburgh	201-500	292	177
10	The Missing Link	London	201-500	216	150
11	The Redesign Group	London	201-500	201	140
12	Intragen	London	201-500	188	128
13	Fournet	Derby	201-500	173	115
14	Exclusive Networks UK	Mansfield	201-500	168	118
15	Cyberfort	Thatcham	51-200	160	88
16	LOGIQ	Bristol	201-500	142	81
17	Cybersec Consulting	London	201-500	141	76
18	Cipher سايڤر	London	201-500	135	50
19	Friend MTS	Manchester	51-200	118	82
20	Bulletproof Cyber Security	London	51-200	118	75
21	Sep2	London	51-200	99	20
22	Drawbridge	London	51-200	97	60
23	Nomios Uk&i	Manchester	51-200	96	49
24	Cyberone	London	51-200	96	39
25	Wavenet Cyberguard	London	201-500	86	58

Showing 25 of 1,296 enterprise cybersecurity companies based in the United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 12,819 reachable decision-makers.

Free account · no credit card

See all 1,296 companies

Enterprise cybersecurity companies based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 550 HQs

4,299Contacts with mobile numbers

0Emails re-verified in last 30 days

Companies by employee count

1-10

740

11-50

392

51-200

113

201-500

501-1,000

1,001-5,000

5,001-10,000

Enterprise cybersecurity companies by metro

Metro	Companies
Enterprise cybersecurity companies in London	550
Enterprise cybersecurity companies in Manchester	45
Enterprise cybersecurity companies in Cheltenham	23
Enterprise cybersecurity companies in Birmingham	22
Enterprise cybersecurity companies in Cambridge	15
Enterprise cybersecurity companies in Leeds	13
Enterprise cybersecurity companies in Reading	12

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 “enterprise cybersecurity 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; 0 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 enterprise cybersecurity companies are there based in the United Kingdom?

There are 1,296 enterprise cybersecurity 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 enterprise cybersecurity companies?

London leads with 550 headquartered companies, followed by Manchester (45) and Cheltenham (23).

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 12,819 verified decision-maker contacts tracked across these 1,296 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.

Ready to reach these companies? Verified emails and direct dials for all 1,296 enterprise cybersecurity companies based in the United Kingdom. Start with a free account, no credit card.

Get the full list

Related lists

Enterprise cybersecurity companies by geography

Browse the directory

Browse: Companies home · All United Kingdom lists · All Enterprise cybersecurity companies lists · New lists

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.