Company lists · Data verified August 2026

Top 25 Data center security companies based in the United Kingdom

Name: Data center security 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 314 companies tracked

There are 314 data center security companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 7,569 professional contacts across them, including 1,273 with verified work emails and 482 with mobile numbers. London is the largest hub.

This list covers data center security 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.

314Companies

7,569Contacts tracked

1,273Verified emails

482Mobile numbers

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The 25 largest data center security companies based in the United Kingdom

Ranked by team size

Top 25 of 314 data center security 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	CIS Security Limited	London	1,001-5,000	913	201
2	Lodge Security	Cirencester	1,001-5,000	419	62
3	Datalec Precision Installations Limited	Buntingford Herts	51-200	179	107
4	Cyberfort	Thatcham	51-200	160	88
5	Bulletproof Cyber Security	London	51-200	118	75
6	K4 Security - K4 Group	Manchester	201-500	90	8
7	Wavenet Cyberguard	London	201-500	86	58
8	Nationwide Security	Albans	51-200	81	12
9	Brightsolid	Dundee	51-200	77	50
10	City Security Services Part Of City Group Security	London	201-500	64	1
11	Black Diamond Security	London	201-500	62	14
12	Shield Security Services LTD	Aldershot	51-200	53	3
13	Portal Security	Glasgow	201-500	52	18
14	Satisnet, A Gamma Company	Luton	51-200	46	8
15	Phoenix FMS	Newcastle Upon Tyne	201-500	44	2
16	Ak9 Security And FM Solutions LTD	London	501-1,000	43	9
17	Atec Security	Bishops Stortford	51-200	40	31
18	Prosec UK	Doncaster	51-200	32	4
19	Alton Valley	Derby	51-200	31	19
20	VIS Security Solutions Limited	Belfast	51-200	30	22
21	Dnssense	London	51-200	30	14
22	Guide Security	Darwen	51-200	30	11
23	Gbsg LTD	n/a	51-200	27	14
24	Prism DCS	Watford	51-200	26	18
25	Veritech Security	Southampton	51-200	25	13

Showing 25 of 314 data center security companies based in the United Kingdom

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Data center security companies based in the United Kingdom at a glance

As of Aug 28, 2026

11-50Median size (employees)

LondonLargest hub · 82 HQs

482Contacts with mobile numbers

3Emails re-verified in last 30 days

Companies by employee count

1-10

129

11-50

103

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Data center security companies by metro

Metro	Companies
Data center security companies in London	82
Data center security companies in Manchester	10
Data center security companies in Birmingham	9
Data center security companies in Leeds	6
Data center security companies in Glasgow	5
Data center security companies in Poole	4
Data center security companies in Sheffield	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 “data center security 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 data center security companies are there based in the United Kingdom?

There are 314 data center security companies headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

CIS Security Limited, headquartered in London, tops this list with the largest team on record.

Which city has the most data center security companies?

London leads with 82 headquartered companies, followed by Manchester (10) and Birmingham (9).

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 1,273 verified decision-maker contacts tracked across these 314 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.