Company lists · Data refreshed September 2026

Top 25 Data center security integrators based in London, United Kingdom

Name: Data center security integrators based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 105 companies tracked

RevenueBase identified 105 data center security integrators headquartered in London, United Kingdom as of September 2026 and tracks 1,347 professional contacts across them, including 580 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers data center security integrators headquartered in London, United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 28, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 28, 2026 86% judged on-target in blind review

105Companies

1,347Contacts tracked

580Verified emails

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The 25 largest data center security integrators based in London, United Kingdom

Ranked by team size

Top 25 of 105 data center security integrators based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to data center security integrators: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	QCIC	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	159 contacts →
	Partial evidence “QCIC is an award-winning global engineering firm specialising in designing, building and running security systems.” Source: RevenueBase Database · checked Sep 28, 2026
2	LMG Lmgiq.com	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	153 contacts →
	Indirect evidence “For 40 years, LMG has delivered secure, resilient and proven digital infrastructure solutions across the built environment.” Source: RevenueBase Database · checked Sep 28, 2026
3	Caretower An Integrity360 Company	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	97 contacts →
	Partial evidence “As an independent IT security specialist, Caretower provide comprehensive solutions to individual problems, thus allowing our recommendations to be unbiased.” Source: RevenueBase Database · checked Sep 28, 2026
4	Insoft Services	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	60 contacts →
	Strong evidence “Insoft Services specializes in elevating IT infrastructure resilience and security, focusing on the critical domains of IT networking, data center infrastructure, cybersecurity…” Source: RevenueBase Database · checked Sep 28, 2026
5	Custom Intelligent Security	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	51 contacts →
	Partial evidence “Established in Custom Intelligent Security is a technology driven ISO27001 & NSi Gold Accredited independent electronic security specialist with a proven track record of…” Source: RevenueBase Database · checked Sep 28, 2026
6	Sensetech Systems LTD	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	50 contacts →
	Strong evidence “Sensetech Systems Ltd is an LPS1014 Accredited independent Fire Alarm, Security and Structured Data Cabling Company.” Source: RevenueBase Database · checked Sep 28, 2026
7	Electranet UK Limited	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	49 contacts →
	Indirect evidence “Electranet’s mission is to be a preferred partner to the public and private sectors, bringing competitively priced, secure and innovative solutions to the market.” Source: RevenueBase Database · checked Sep 28, 2026
8	Gratte Brothers Security Systems & Software	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	39 contacts →
	Partial evidence “Gratte Brothers is an experienced provider of integrated security solutions, which are Built on Strong Values and ultimately deliver a measurable return on investment.” Source: RevenueBase Database · checked Sep 28, 2026
9	Universal Security Systems LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	39 contacts →
	Partial evidence “Universal Security Systems Limited is a specialist provider of installation and maintenance services for all types of security systems including Access Control, Closed Circuit…” Source: RevenueBase Database · checked Sep 28, 2026
10	Pafi LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	32 contacts →
	Partial evidence “Pafi Ltd, Was formed in 1995 to design, install and maintain integrated security solutions for the commercial market.” Source: RevenueBase Database · checked Sep 28, 2026
11	Principle Networks	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	24 contacts →
	Partial evidence “Principle Networks works with commercial and regulated organisations to reduce cyber risk and cost by simplifying security and network architecture.” Source: RevenueBase Database · checked Sep 28, 2026
12	Welcome Gate	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	23 contacts →
	Partial evidence “Who are you… Most likely you are a Workplace or IT Professional with a lot on your plate including physical electronic security systems, such as - Access control - CCTV - Intruder…” Source: RevenueBase Database · checked Sep 28, 2026
13	Formation Tech	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	22 contacts →
	Indirect evidence “Specialsing in cybersecurity, networks, voice and video, we're on a mission to transform workspaces and deliver exceptional outcomes for our clients.” Source: RevenueBase Database · checked Sep 28, 2026
14	NGS Next Generation Security	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	20 contacts →
	Partial evidence “Formed in 2018, NGS (UK) Ltd are independent, Next Generation Security trusted advisors, providing all-encompassing solutions from the perimeter to the endpoint.” Source: RevenueBase Database · checked Sep 28, 2026
15	SW Security Solutions LTD	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	17 contacts →
	Strong evidence “SW Security Solutions SA - Integrators of electronic security systems in 18 countries around the world.” Source: RevenueBase Database · checked Sep 28, 2026
16	Techserve	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	17 contacts →
	Partial evidence “Most companies run on disconnected data.” Source: RevenueBase Database · checked Sep 28, 2026
17	Alchem Technologies LTD	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	14 contacts →
	Strong evidence “Alchem is a data and systems integrator providing high-end technical capabilities in the national security, defence, and critical infrastructure sectors.” Source: RevenueBase Database · checked Sep 28, 2026
18	Sylversys	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	14 contacts →
	Indirect evidence “SYLVERSYS is a solutions integration firm with a specialty in providing secure computer and network products/solutions for businesses and organizations in the private and public…” Source: RevenueBase Database · checked Sep 28, 2026
19	Definitive Security Solutions LTD	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	13 contacts →
	Strong evidence “Definitive Security Solutions are an established designer, installer and maintainer of security, CCTV, intruder alarms, access control, power and data, and fire detection systems.” Source: RevenueBase Database · checked Sep 28, 2026
20	The Security Group	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	11 contacts →
	Partial evidence “The Security Group delivers state-of-the-art security solutions to protect businesses, assets, and people.” Source: RevenueBase Database · checked Sep 28, 2026
21	RJK Security Systems	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	11 contacts →
	Strong evidence “RJK Security Systems are a specialist contractor and integrator of electronic security systems and Audio-Visual/Smarthome automation.” Source: RevenueBase Database · checked Sep 28, 2026
22	LDN Security Solutions Limited	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	10 contacts →
	Partial evidence “London-based security company specialising in the design, installation, service and maintenance of single domestic, multi-occupancy residential and commercial security systems.” Source: RevenueBase Database · checked Sep 28, 2026
23	Kompingo	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	7 contacts →
	Indirect evidence “Innovating Cybersecurity.” Source: RevenueBase Database · checked Sep 28, 2026
24	Ansador Fire & Security	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	6 contacts →
	Indirect evidence “Ansador Ltd has been privately owned since it was founded in 1982, providing system solutions to corporate and global clients across EMEA.” Source: RevenueBase Database · checked Sep 28, 2026
25	WYMO	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	6 contacts →
	Strong evidence “At WYMO, we specialise in delivering tailored, cutting-edge solutions in IT Consultancy, Managed IT Services, Audio-Visual Integration, Wi-Fi, Cyber Security, Data Access Control…” Source: RevenueBase Database · checked Sep 28, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: data center security integrators. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names data center security integrators.
Partial evidence: Its own public description names part of data center security integrators, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name data center security integrators. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 105 data center security integrators based in London, United Kingdom

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Data center security integrators based in London, United Kingdom at a glance

As of Sep 28, 2026

43.1%Verified-email coverage

12.8Average contacts per company

11-50Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 105 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among data center security integrators, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in London, United Kingdom whose own description of what they do matches “data center security integrators”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names data center security integrators), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among data center security integrators, and records with no verified work email. Companies headquartered outside London are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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: Every listed company carries at least one verified work email, 580 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 28, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names data center security integrators, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many data center security integrators are there based in London, United Kingdom?

RevenueBase identified 105 data center security integrators headquartered in London, United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

QCIC, headquartered in London, tops this list with the largest team on record.

Which city in the United Kingdom has the most data center security integrators?

London leads the United Kingdom with 105 headquartered companies, followed by Leeds (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 580 verified decision-maker contacts tracked across these 105 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 28, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 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 with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.