Company lists · Data verified August 2026

Top 25 Cybersecurity staffing based in the United Kingdom

Name: Cybersecurity staffing 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 1,030 companies tracked

There are 1,030 cybersecurity staffing headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 17,505 professional contacts across them, including 6,803 with verified work emails and 2,133 with mobile numbers. London is the largest hub.

This list covers cybersecurity staffing 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.

1,030Companies

17,505Contacts tracked

6,803Verified emails

2,133Mobile numbers

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The 25 largest cybersecurity staffing based in the United Kingdom

Ranked by team size

Top 25 of 1,030 cybersecurity staffing 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	Bridewell	Edinburgh	201-500	304	189
6	Quorum Cyber	Edinburgh	201-500	292	177
7	Exclusive Networks UK	Mansfield	201-500	168	118
8	Cyberfort	Thatcham	51-200	160	88
9	Cybersec Consulting	London	201-500	141	76
10	Cipher سايڤر	London	201-500	135	50
11	Khipu Networks	Fleet	51-200	129	94
12	Bulletproof Cyber Security	London	51-200	118	75
13	Foresite Cybersecurity	Farnborough	51-200	100	67
14	Drawbridge	London	51-200	97	60
15	ITC Secure	London	51-200	87	39
16	Wavenet Cyberguard	London	201-500	86	58
17	Cybersmart	London	51-200	83	55
18	Reliance Cyber	Waterloo	51-200	80	47
19	Saepio Information Security	High Wycombe	51-200	73	57
20	TDI Tetrad Digital Integrity	Windsor	51-200	71	39
21	Stripe OLT	Manchester	51-200	68	36
22	Covertswarm	London	51-200	65	41
23	Cyro Cyber	London	51-200	63	10
24	Allied Associates International	London	51-200	60	32
25	Interrupt Labs	Basingstoke	51-200	60	6

Showing 25 of 1,030 cybersecurity staffing based in the United Kingdom

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Cybersecurity staffing based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 430 HQs

2,133Contacts with mobile numbers

14Emails re-verified in last 30 days

Companies by employee count

1-10

629

11-50

292

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Cybersecurity staffing by metro

Metro	Companies
Cybersecurity staffing in London	430
Cybersecurity staffing in Manchester	49
Cybersecurity staffing in Birmingham	23
Cybersecurity staffing in Cheltenham	19
Cybersecurity staffing in Bristol	14
Cybersecurity staffing in Milton Keynes	12
Cybersecurity staffing in Cambridge	11

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 staffing”, 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; 14 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 staffing are there based in the United Kingdom?

There are 1,030 cybersecurity staffing 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 staffing?

London leads with 430 headquartered companies, followed by Manchester (49) and Birmingham (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 6,803 verified decision-maker contacts tracked across these 1,030 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.