Company lists · Data verified August 2026

Top 25 Cybersecurity energy sector companies based in the United Kingdom

Name: Cybersecurity energy sector companies 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 173 companies tracked

There are 173 cybersecurity energy sector companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 3,580 professional contacts across them, including 1,089 with verified work emails and 305 with mobile numbers. London is the largest hub.

This list covers cybersecurity energy sector companies 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.

173Companies

3,580Contacts tracked

1,089Verified emails

305Mobile numbers

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The 25 largest cybersecurity energy sector companies based in the United Kingdom

Ranked by team size

Top 25 of 173 cybersecurity energy sector companies 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	Bridewell	Edinburgh	201-500	304	189
2	Cyberfort	Thatcham	51-200	160	88
3	Cybersec Consulting	London	201-500	141	76
4	Khipu Networks	Fleet	51-200	129	94
5	Camlin Energy	Lisburn	501-1,000	105	64
6	Foresite Cybersecurity	Farnborough	51-200	100	67
7	ITC Secure	London	51-200	87	39
8	Reliance Cyber	Waterloo	51-200	80	47
9	Hexegic	London	51-200	52	30
10	Adarma Security	Edinburgh	201-500	52	23
11	Satisnet, A Gamma Company	Luton	51-200	46	8
12	Mitigo Group	Cheadle	51-200	42	18
13	Cyberis	Tewkesbury	11-50	35	19
14	Secarma LTD	Manchester	11-50	34	23
15	Barrier Networks	London	11-50	33	22
16	defense.com	Stevenage	51-200	32	13
17	Aristi	Birmingham	11-50	32	10
18	Procheckup PCU	Portsmouth	11-50	30	18
19	ITB LTD	Eynsham	11-50	28	8
20	J2 Mssp	London	11-50	27	2
21	Tekgem	Sedgefield	11-50	26	10
22	Pentesec	Peterborough	51-200	24	18
23	AMR Cybersecurity	Cheltenham	11-50	23	17
24	Blue Cube Security LTD	East Grinstead	11-50	23	15
25	Blackfoot Cybersecurity	Welwyn Garden City	11-50	23	13

Showing 25 of 173 cybersecurity energy sector companies based in the United Kingdom

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Cybersecurity energy sector companies based in the United Kingdom at a glance

As of Aug 28, 2026

11-50Median size (employees)

LondonLargest hub · 72 HQs

305Contacts with mobile numbers

3Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

Cybersecurity energy sector companies by metro

Metro	Companies
Cybersecurity energy sector companies in London	72
Cybersecurity energy sector companies in Manchester	8
Cybersecurity energy sector companies in Cambridge	3
Cybersecurity energy sector companies in Birmingham	3
Cybersecurity energy sector companies in Royal Leamington Spa	3
Cybersecurity energy sector companies in Cheltenham	3
Cybersecurity energy sector companies in Bristol	3
Cybersecurity energy sector companies in Glasgow	2

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 energy sector companies”, 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; 3 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 energy sector companies are there based in the United Kingdom?

There are 173 cybersecurity energy sector companies headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

Bridewell, headquartered in Edinburgh, tops this list with the largest team on record.

Which city has the most cybersecurity energy sector companies?

London leads with 72 headquartered companies, followed by Manchester (8) and Cambridge (3).

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 1,089 verified decision-maker contacts tracked across these 173 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.