Company lists · Data verified August 2026

Top 25 Content-aware security companies based in the United Kingdom

Name: Content-aware security 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 647 companies tracked

There are 647 content-aware security companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 18,829 professional contacts across them, including 8,279 with verified work emails and 2,613 with mobile numbers. London is the largest hub.

This list covers content-aware security 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.

647Companies

18,829Contacts tracked

8,279Verified emails

2,613Mobile numbers

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The 25 largest content-aware security companies based in the United Kingdom

Ranked by team size

Top 25 of 647 content-aware security 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	Darktrace	Cambridge	1,001-5,000	2,590	1,791
3	Zerofox	n/a	501-1,000	894	382
4	SISA	Leicester	201-500	739	253
5	Everfox	London	1,001-5,000	635	13
6	Withsecure	London	501-1,000	614	329
7	Bridewell	Edinburgh	201-500	304	189
8	Quorum Cyber	Edinburgh	201-500	292	177
9	Exclusive Networks UK	Mansfield	201-500	168	118
10	Sapphire	Newcastle Upon Tyne	51-200	165	59
11	Cyberfort	Thatcham	51-200	160	88
12	Cybersec Consulting	London	201-500	141	76
13	Cipher سايڤر	London	201-500	135	50
14	Khipu Networks	Fleet	51-200	129	94
15	Friend MTS	Manchester	51-200	118	82
16	Bulletproof Cyber Security	London	51-200	118	75
17	Foresite Cybersecurity	Farnborough	51-200	100	67
18	Caretower An Integrity360 Company	London	201-500	97	12
19	ITC Secure	London	51-200	87	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	TDI Tetrad Digital Integrity	Windsor	51-200	71	39
24	CSA Cyber	Gloucester	51-200	68	31
25	Telesoft	Blandford	51-200	68	19

Showing 25 of 647 content-aware security companies based in the United Kingdom

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Content-aware security companies based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 258 HQs

2,613Contacts with mobile numbers

15Emails re-verified in last 30 days

Companies by employee count

1-10

327

11-50

219

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Content-aware security companies by metro

Metro	Companies
Content-aware security companies in London	258
Content-aware security companies in Manchester	27
Content-aware security companies in Birmingham	14
Content-aware security companies in Cheltenham	13
Content-aware security companies in Milton Keynes	8
Content-aware security companies in Reading	8
Content-aware security companies in Edinburgh	7

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 “content-aware security 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; 15 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 content-aware security companies are there based in the United Kingdom?

There are 647 content-aware security 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 content-aware security companies?

London leads with 258 headquartered companies, followed by Manchester (27) and Birmingham (14).

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 8,279 verified decision-maker contacts tracked across these 647 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.