Company lists · Data verified August 2026

Top 25 Cybersecurity consulting for defense based in the United Kingdom

Name: Cybersecurity consulting for defense 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 1,302 companies tracked

There are 1,302 cybersecurity consulting for defense headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 19,912 professional contacts across them, including 7,900 with verified work emails and 2,187 with mobile numbers. London is the largest hub.

This list covers cybersecurity consulting for defense 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.

1,302Companies

19,912Contacts tracked

7,900Verified emails

2,187Mobile numbers

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The 25 largest cybersecurity consulting for defense based in the United Kingdom

Ranked by team size

Top 25 of 1,302 cybersecurity consulting for defense 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	ROKE	Manchester	1,001-5,000	684	410
4	Everfox	London	1,001-5,000	635	13
5	MASS	Lincoln	201-500	633	203
6	Bridewell	Edinburgh	201-500	304	189
7	Inzpire	Lincoln	201-500	275	155
8	The Redesign Group	London	201-500	201	140
9	Risk Associates - Emea & Asia	London	51-200	169	62
10	Exclusive Networks UK	Mansfield	201-500	168	118
11	Sapphire	Newcastle Upon Tyne	51-200	165	59
12	Cyberfort	Thatcham	51-200	160	88
13	LOGIQ	Bristol	201-500	142	81
14	Cybersec Consulting	London	201-500	141	76
15	CCL Solutions Group	Stratford Upon Avon	51-200	136	68
16	Khipu Networks	Fleet	51-200	129	94
17	Trpglobal	London	51-200	123	36
18	Bulletproof Cyber Security	London	51-200	118	75
19	Foresite Cybersecurity	Farnborough	51-200	100	67
20	Caretower An Integrity360 Company	London	201-500	97	12
21	Softwerx	Cambridge	51-200	95	44
22	Wavenet Cyberguard	London	201-500	86	58
23	Reliance Cyber	Waterloo	51-200	80	47
24	Saepio Information Security	High Wycombe	51-200	73	57
25	TDI Tetrad Digital Integrity	Windsor	51-200	71	39

Showing 25 of 1,302 cybersecurity consulting for defense based in the United Kingdom

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Cybersecurity consulting for defense based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 513 HQs

2,187Contacts with mobile numbers

15Emails re-verified in last 30 days

Companies by employee count

1-10

827

11-50

338

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Cybersecurity consulting for defense by metro

Metro	Companies
Cybersecurity consulting for defense in London	513
Cybersecurity consulting for defense in Manchester	52
Cybersecurity consulting for defense in Cheltenham	25
Cybersecurity consulting for defense in Birmingham	24
Cybersecurity consulting for defense in Bristol	19
Cybersecurity consulting for defense in Cambridge	15
Cybersecurity consulting for defense in Edinburgh	13

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 consulting for defense”, 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; 15 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 consulting for defense are there based in the United Kingdom?

There are 1,302 cybersecurity consulting for defense 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 consulting for defense?

London leads with 513 headquartered companies, followed by Manchester (52) and Cheltenham (25).

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 7,900 verified decision-maker contacts tracked across these 1,302 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.