Company lists · Data verified August 2026

Top 25 Cybersecurity incident response based in the United Kingdom

Name: Cybersecurity incident response 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 378 companies tracked

There are 378 cybersecurity incident response headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 10,042 professional contacts across them, including 4,101 with verified work emails and 1,208 with mobile numbers. London is the largest hub.

This list covers cybersecurity incident response 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.

378Companies

10,042Contacts tracked

4,101Verified emails

1,208Mobile numbers

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The 25 largest cybersecurity incident response based in the United Kingdom

Ranked by team size

Top 25 of 378 cybersecurity incident response 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	Cyberfort	Thatcham	51-200	160	88
4	Cybersec Consulting	London	201-500	141	76
5	ITC Secure	London	51-200	87	39
6	Wavenet Cyberguard	London	201-500	86	58
7	Reliance Cyber	Waterloo	51-200	80	47
8	Izoologic	City Of London	201-500	67	48
9	Digitalxraid	Doncaster	51-200	59	39
10	Istari	London	51-200	53	29
11	Hexegic	London	51-200	52	30
12	Redscan, A Kroll Business	London	51-200	52	29
13	Adarma Security	Edinburgh	201-500	52	23
14	Satisnet, A Gamma Company	Luton	51-200	46	8
15	Mitigo Group	Cheadle	51-200	42	18
16	Cybaverse	London	51-200	40	23
17	Omerta	Saffron Walden	51-200	38	15
18	Cyberis	Tewkesbury	11-50	35	19
19	Jumpsec	London	51-200	35	16
20	Secarma LTD	Manchester	11-50	34	23
21	defense.com	Stevenage	51-200	32	13
22	Procheckup PCU	Portsmouth	11-50	30	18
23	Encode	London	51-200	25	9
24	Pentesec	Peterborough	51-200	24	18
25	Redfox Cybersecurity	London	11-50	24	6

Showing 25 of 378 cybersecurity incident response based in the United Kingdom

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Cybersecurity incident response based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 165 HQs

1,208Contacts with mobile numbers

6Emails re-verified in last 30 days

Companies by employee count

1-10

213

11-50

107

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Cybersecurity incident response by metro

Metro	Companies
Cybersecurity incident response in London	165
Cybersecurity incident response in Manchester	18
Cybersecurity incident response in Birmingham	7
Cybersecurity incident response in Cheltenham	5
Cybersecurity incident response in Leicester	4
Cybersecurity incident response in Liverpool	4
Cybersecurity incident response in Cambridge	4

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 incident response”, 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; 6 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 incident response are there based in the United Kingdom?

There are 378 cybersecurity incident response 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 incident response?

London leads with 165 headquartered companies, followed by Manchester (18) and Birmingham (7).

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 4,101 verified decision-maker contacts tracked across these 378 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.