Company lists · Data verified August 2026

Top 25 Cybersecurity investigation companies based in the United Kingdom

Name: Cybersecurity investigation 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 964 companies tracked

There are 964 cybersecurity investigation companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 18,316 professional contacts across them, including 7,670 with verified work emails and 2,372 with mobile numbers. London is the largest hub.

This list covers cybersecurity investigation 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.

964Companies

18,316Contacts tracked

7,670Verified emails

2,372Mobile numbers

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The 25 largest cybersecurity investigation companies based in the United Kingdom

Ranked by team size

Top 25 of 964 cybersecurity investigation 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	Magnet Forensics	Leatherhead	1,001-5,000	855	650
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	Netcraft	London	201-500	206	105
10	Risk Associates - Emea & Asia	London	51-200	169	62
11	Cyberfort	Thatcham	51-200	160	88
12	Cybersec Consulting	London	201-500	141	76
13	CCL Solutions Group	Stratford Upon Avon	51-200	136	68
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	FACT	London	51-200	117	38
18	Foresite Cybersecurity	Farnborough	51-200	100	67
19	Wavenet Cyberguard	London	201-500	86	58
20	Cybersmart	London	51-200	83	55
21	Reliance Cyber	Waterloo	51-200	80	47
22	Becrypt	London	51-200	69	56
23	Izoologic	City Of London	201-500	67	48
24	Eset UK	Bournemouth	51-200	66	41
25	Covertswarm	London	51-200	65	41

Showing 25 of 964 cybersecurity investigation companies based in the United Kingdom

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Cybersecurity investigation companies based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 405 HQs

2,372Contacts with mobile numbers

12Emails re-verified in last 30 days

Companies by employee count

1-10

569

11-50

280

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Cybersecurity investigation companies by metro

Metro	Companies
Cybersecurity investigation companies in London	405
Cybersecurity investigation companies in Manchester	39
Cybersecurity investigation companies in Cheltenham	20
Cybersecurity investigation companies in Birmingham	17
Cybersecurity investigation companies in Cambridge	12
Cybersecurity investigation companies in Edinburgh	10
Cybersecurity investigation companies in Bristol	10

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 investigation 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; 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 investigation companies are there based in the United Kingdom?

There are 964 cybersecurity investigation 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 investigation companies?

London leads with 405 headquartered companies, followed by Manchester (39) and Cheltenham (20).

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 7,670 verified decision-maker contacts tracked across these 964 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.