Company lists · Data verified August 2026

Top 25 Cybersecurity law firms based in the United Kingdom

Name: Cybersecurity law firms 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 406 companies tracked

There are 406 cybersecurity law firms headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 4,728 professional contacts across them, including 1,425 with verified work emails and 413 with mobile numbers. London is the largest hub.

This list covers cybersecurity law firms 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.

406Companies

4,728Contacts tracked

1,425Verified emails

413Mobile numbers

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The 25 largest cybersecurity law firms based in the United Kingdom

Ranked by team size

Top 25 of 406 cybersecurity law firms 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	SISA	Leicester	201-500	739	253
2	Cyberfort	Thatcham	51-200	160	88
3	Bulletproof Cyber Security	London	51-200	118	75
4	Foresite Cybersecurity	Farnborough	51-200	100	67
5	Reliance Cyber	Waterloo	51-200	80	47
6	Atheria LAW	London	11-50	62	50
7	Evalian	Worcester	51-200	61	39
8	Hexens	London	51-200	55	17
9	Istari	London	51-200	53	29
10	Hexegic	London	51-200	52	30
11	Adarma Security	Edinburgh	201-500	52	23
12	Mitigo Group	Cheadle	51-200	42	18
13	Secarma LTD	Manchester	11-50	34	23
14	Beyond Blue Limited	London	11-50	26	2
15	Encode	London	51-200	25	9
16	Pentesec	Peterborough	51-200	24	18
17	Redfox Cybersecurity	London	11-50	24	6
18	Blackfoot Cybersecurity	Welwyn Garden City	11-50	23	13
19	ONE Compliance Cyber Limited	n/a	11-50	20	13
20	Information Risk Management IRM	London	51-200	20	3
21	Halo I.S	Leeds	11-50	19	9
22	Barefoot Cyber	London	11-50	16	9
23	B10sec	Cheltenham	11-50	16	6
24	Lrqa Nettitude	Birmingham	201-500	15	14
25	Viso Cyber Security	London	11-50	15	11

Showing 25 of 406 cybersecurity law firms based in the United Kingdom

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Cybersecurity law firms based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 190 HQs

413Contacts with mobile numbers

2Emails re-verified in last 30 days

Companies by employee count

1-10

255

11-50

117

51-200

201-500

501-1,000

Cybersecurity law firms by metro

Metro	Companies
Cybersecurity law firms in London	190
Cybersecurity law firms in Manchester	17
Cybersecurity law firms in Cambridge	6
Cybersecurity law firms in Birmingham	6
Cybersecurity law firms in Cheltenham	6
Cybersecurity law firms in Milton Keynes	5
Cybersecurity law firms in Newbury	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 law firms”, 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; 2 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 law firms are there based in the United Kingdom?

There are 406 cybersecurity law firms headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

SISA, headquartered in Leicester, tops this list with the largest team on record.

Which city has the most cybersecurity law firms?

London leads with 190 headquartered companies, followed by Manchester (17) and Cambridge (6).

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 1,425 verified decision-maker contacts tracked across these 406 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.