Company lists · Data verified August 2026

Top 25 Cybersecurity and recovery firms based in the United Kingdom

Name: Cybersecurity and recovery firms 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 770 companies tracked

There are 770 cybersecurity and recovery firms headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 15,358 professional contacts across them, including 6,183 with verified work emails and 1,865 with mobile numbers. London is the largest hub.

This list covers cybersecurity and recovery firms 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.

770Companies

15,358Contacts tracked

6,183Verified emails

1,865Mobile numbers

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The 25 largest cybersecurity and recovery firms based in the United Kingdom

Ranked by team size

Top 25 of 770 cybersecurity and recovery firms 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	Integrity360	London	501-1,000	341	199
6	Bridewell	Edinburgh	201-500	304	189
7	Cyberfort	Thatcham	51-200	160	88
8	Cybersec Consulting	London	201-500	141	76
9	CCL Solutions Group	Stratford Upon Avon	51-200	136	68
10	Khipu Networks	Fleet	51-200	129	94
11	Bulletproof Cyber Security	London	51-200	118	75
12	Foresite Cybersecurity	Farnborough	51-200	100	67
13	Cybersrc Consultancy	London	51-200	99	39
14	Databarracks	London	51-200	98	56
15	Cyberone	London	51-200	96	39
16	ITC Secure	London	51-200	87	39
17	Wavenet Cyberguard	London	201-500	86	58
18	Cybersmart	London	51-200	83	55
19	Reliance Cyber	Waterloo	51-200	80	47
20	Saepio Information Security	High Wycombe	51-200	73	57
21	Izoologic	City Of London	201-500	67	48
22	Daintta	London	51-200	61	18
23	Allied Associates International	London	51-200	60	32
24	Cyberlab	Lincoln	51-200	56	41
25	Hexegic	London	51-200	52	30

Showing 25 of 770 cybersecurity and recovery firms based in the United Kingdom

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Cybersecurity and recovery firms based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 329 HQs

1,865Contacts with mobile numbers

12Emails re-verified in last 30 days

Companies by employee count

1-10

447

11-50

224

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Cybersecurity and recovery firms by metro

Metro	Companies
Cybersecurity and recovery firms in London	329
Cybersecurity and recovery firms in Manchester	34
Cybersecurity and recovery firms in Cheltenham	21
Cybersecurity and recovery firms in Birmingham	14
Cybersecurity and recovery firms in Sheffield	8
Cybersecurity and recovery firms in Leicester	8
Cybersecurity and recovery firms in Milton Keynes	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 “cybersecurity and recovery firms”, 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; 12 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 and recovery firms are there based in the United Kingdom?

There are 770 cybersecurity and recovery firms 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 and recovery firms?

London leads with 329 headquartered companies, followed by Manchester (34) and Cheltenham (21).

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 6,183 verified decision-maker contacts tracked across these 770 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.