Company lists · Data verified August 2026

Top 25 Cybersecurity engineers based in the United Kingdom

Name: Cybersecurity engineers 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 944 companies tracked

There are 944 cybersecurity engineers headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 16,339 professional contacts across them, including 6,392 with verified work emails and 1,935 with mobile numbers. London is the largest hub.

This list covers cybersecurity engineers 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.

944Companies

16,339Contacts tracked

6,392Verified emails

1,935Mobile numbers

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The 25 largest cybersecurity engineers based in the United Kingdom

Ranked by team size

Top 25 of 944 cybersecurity engineers 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	Bridewell	Edinburgh	201-500	304	189
5	Quorum Cyber	Edinburgh	201-500	292	177
6	Intragen	London	201-500	188	128
7	Exclusive Networks UK	Mansfield	201-500	168	118
8	Sapphire	Newcastle Upon Tyne	51-200	165	59
9	Cyberfort	Thatcham	51-200	160	88
10	LOGIQ	Bristol	201-500	142	81
11	Cybersec Consulting	London	201-500	141	76
12	Cipher سايڤر	London	201-500	135	50
13	Bulletproof Cyber Security	London	51-200	118	75
14	Foresite Cybersecurity	Farnborough	51-200	100	67
15	Sep2	London	51-200	99	20
16	Caretower An Integrity360 Company	London	201-500	97	12
17	Titania LTD	London	51-200	89	47
18	Wavenet Cyberguard	London	201-500	86	58
19	Cybersmart	London	51-200	83	55
20	Reliance Cyber	Waterloo	51-200	80	47
21	Synoptix	Bristol	51-200	76	11
22	TDI Tetrad Digital Integrity	Windsor	51-200	71	39
23	Stripe OLT	Manchester	51-200	68	36
24	CSA Cyber	Gloucester	51-200	68	31
25	Eset UK	Bournemouth	51-200	66	41

Showing 25 of 944 cybersecurity engineers based in the United Kingdom

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Cybersecurity engineers based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 378 HQs

1,935Contacts with mobile numbers

9Emails re-verified in last 30 days

Companies by employee count

1-10

570

11-50

272

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Cybersecurity engineers by metro

Metro	Companies
Cybersecurity engineers in London	378
Cybersecurity engineers in Manchester	40
Cybersecurity engineers in Cheltenham	21
Cybersecurity engineers in Birmingham	17
Cybersecurity engineers in Bristol	13
Cybersecurity engineers in Cambridge	12
Cybersecurity engineers in Milton Keynes	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 engineers”, 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; 9 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 engineers are there based in the United Kingdom?

There are 944 cybersecurity engineers 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 engineers?

London leads with 378 headquartered companies, followed by Manchester (40) 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 6,392 verified decision-maker contacts tracked across these 944 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.