Company lists · Data verified August 2026

Top 25 Data center security services based in the United Kingdom

Name: Data center security services 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 552 companies tracked

There are 552 data center security services headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 10,971 professional contacts across them, including 1,980 with verified work emails and 667 with mobile numbers. London is the largest hub.

This list covers data center security services 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.

552Companies

10,971Contacts tracked

1,980Verified emails

667Mobile numbers

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

Ranked by team size

Top 25 of 552 data center security services 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	Bridewell	Edinburgh	201-500	304	189
4	Openview Security Solutions Limited	Romford	201-500	200	86
5	Datalec Precision Installations Limited	Buntingford Herts	51-200	179	107
6	Cyberfort	Thatcham	51-200	160	88
7	The Keyholding Company	London	51-200	133	2
8	Consortio Security	Castle Donington	501-1,000	107	19
9	K4 Security - K4 Group	Manchester	201-500	90	8
10	Croma Security Solutions Group PLC Cssg	Basingstoke Hamsphire	501-1,000	87	11
11	Wavenet Cyberguard	London	201-500	86	58
12	Nationwide Security	Albans	51-200	81	12
13	Virtual IT LTD	Laindon	51-200	79	51
14	Brightsolid	Dundee	51-200	77	50
15	Northern Security LTD	Middlesbrough	201-500	70	13
16	City Security Services Part Of City Group Security	London	201-500	64	1
17	Black Diamond Security	London	201-500	62	14
18	SQR Group Security Solutions LTD	Barnet	501-1,000	60	7
19	Hexegic	London	51-200	52	30
20	Portal Security	Glasgow	201-500	52	18
21	Amthal Group Companies	St Albans	51-200	48	30
22	Phoenix FMS	Newcastle Upon Tyne	201-500	44	2
23	AIB Group	Park Bletchley	201-500	43	10
24	Ak9 Security And FM Solutions LTD	London	501-1,000	43	9
25	Gratte Brothers Security Systems & Software	London	51-200	39	32

Showing 25 of 552 data center security services based in the United Kingdom

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

As of Aug 28, 2026

11-50Median size (employees)

LondonLargest hub · 134 HQs

667Contacts with mobile numbers

4Emails re-verified in last 30 days

Companies by employee count

1-10

192

11-50

195

51-200

105

201-500

501-1,000

1,001-5,000

5,001-10,000

Data center security services by metro

Metro	Companies
Data center security services in London	134
Data center security services in Manchester	22
Data center security services in Birmingham	16
Data center security services in Leeds	7
Data center security services in Bristol	7
Data center security services in Sheffield	5
Data center security services in Glasgow	5

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 services”, 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; 4 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 services are there based in the United Kingdom?

There are 552 data center security services 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 services?

London leads with 134 headquartered companies, followed by Manchester (22) and Birmingham (16).

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 1,980 verified decision-maker contacts tracked across these 552 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.