Company lists · Data refreshed September 2026

Top 25 Security operations center companies based in the United Kingdom

RevenueBase identified 578 security operations center companies headquartered in the United Kingdom as of September 2026 and tracks 92,739 professional contacts across them, including 5,638 with verified work emails and 8,929 with mobile numbers. London is the largest hub.

This list covers security operations center 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. Every row shows the company's own description, how directly it supports the match, and when it was last checked. Data refreshed September 6, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 Match evidence on every row Refreshed Sep 6, 2026 86% judged on-target in blind review
578Companies
92,739Contacts tracked
5,638Verified emails
8,929Mobile numbers
Explore all 578 companies → Free signup · no credit card · 500 free credits

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

Ranked by team size
Top 25 of 578 security operations center companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 6, 2026. Evidence rates how directly each company's own description names security operations center companies: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#CompanyHeadquartersEmployeesContacts
1
G4sPartial evidence
London, United KingdomHQ checked Sep 6, 202610001+79,699

“G4S is a leading security and facility services company that provides proactive security services and cutting-edge smart technology to deliver tailored, integrated security…”

Source: company website · checked Sep 6, 2026
2
SophosIndirect evidence
Abingdon, United KingdomHQ checked Sep 6, 20265,001-10,0004,925

“Sophos is a cybersecurity leader defending organizations globally with an AI-driven platform and expert-led services.”

Source: company website · checked Sep 6, 2026
3
SecurityhqStrong evidence
London, United KingdomHQ checked Sep 6, 2026501-1,000502

SecurityHQ, a global cybersecurity company pioneering Security Performance Engineering for stronger operational performance and resilience.”

Source: company website · checked Sep 6, 2026
4
Quorum CyberIndirect evidence
Edinburgh, United KingdomHQ checked Sep 6, 2026201-500297

“At Quorum Cyber, we're on a mission to help good people win.”

Source: company website · checked Sep 6, 2026
5
ObrelaPartial evidence
London, United KingdomHQ checked Sep 6, 2026201-500242

“Obrela Security Industries is a global provider of cyber security services.”

Source: company website · checked Sep 6, 2026
6
Deepcytes Cyber Labs UKIndirect evidence
London, United KingdomHQ checked Sep 6, 202651-200177

“Whether you’re a business or an individual, digital threats to your precious data and assets can come in any form - external or internal.”

Source: company website · checked Sep 6, 2026
7
CyberfortPartial evidence
Thatcham, United KingdomHQ checked Sep 6, 202651-200159

“At Cyberfort we are passionate about the cyber security services we deliver for our customers which keeps their people, data, systems and technology infrastructure secure…”

Source: company website · checked Sep 6, 2026
8
Khipu NetworksPartial evidence
Fleet, United KingdomHQ checked Sep 6, 202651-200125

“KHIPU Networks is an award winning international Cyber Security Company delivering a wide range of network, wireless and security solutions, technologies and services across…”

Source: company website · checked Sep 6, 2026
9
Bulletproof Cyber SecurityIndirect evidence
London, United KingdomHQ checked Sep 6, 202651-200123

“Bulletproof is now part of WorkNest Secure.”

Source: company website · checked Sep 6, 2026
10Watford, United KingdomHQ checked Sep 6, 202651-200116

“TSP has a reputation for providing enterprise security solutions, as well as excellent system integration standards and exceptional aftercare support, since its founding in 1988.”

Source: company website · checked Sep 6, 2026
11
RED SiftIndirect evidence
London, United KingdomHQ checked Sep 6, 202651-200109

“Red Sift enables organizations to anticipate, respond to, and recover from cyber attacks while continuing to operate effectively.”

Source: company website · checked Sep 6, 2026
12
CyberonePartial evidence
London, United KingdomHQ checked Sep 6, 202651-20096

“CyberOne is a Microsoft Security Elite Partner and one of only 100 global Microsoft partners recognised with Microsoft-Verified Managed XDR solution status.”

Source: company website · checked Sep 6, 2026
13
Wavenet CyberguardPartial evidence
Stourport-on-severn, United KingdomHQ checked Sep 6, 2026201-50086

“CyberGuard Technologies is the security division of Wavenet.”

Source: company website · checked Sep 6, 2026
14
CybersmartIndirect evidence
London, United KingdomHQ checked Sep 6, 202651-20084

“Cybersecurity should be simple.”

Source: company website · checked Sep 6, 2026
15
ForegenixPartial evidence
Swindon, United KingdomHQ checked Sep 6, 202651-20080

“When your business relies on security, compliance and a strong reputation for taking care of your customers, you need a partner that understands your ethos, your challenges and…”

Source: company website · checked Sep 6, 2026
16
Reliance CyberIndirect evidence
Waterloo, United KingdomHQ checked Sep 6, 202651-20080

“At Reliance Cyber, we believe in truly partnering with our customers.”

Source: company website · checked Sep 6, 2026
17
White HAT An Epam CompanyPartial evidence
London, United KingdomHQ checked Sep 6, 202651-20077

“White Hat, part of the EPAM group, is an award-winning cyber intelligence and offensive security company that leverages an attacker’s perspective to shape innovative, proactive…”

Source: company website · checked Sep 6, 2026
18
TelesoftIndirect evidence
Blandford, United KingdomHQ checked Sep 6, 202651-20068

“The organisations that run our world face relentless complexity and evolving threats.”

Source: company website · checked Sep 6, 2026
19
Eset UKIndirect evidence
Bournemouth, United KingdomHQ checked Sep 6, 202651-20066

“We help businesses and individuals stay protected in an increasingly complex digital world.”

Source: company website · checked Sep 6, 2026
20
NormcyberPartial evidence
Fareham, United KingdomHQ checked Sep 6, 202651-20064

“Established in 2015, NormCyber is a multi-award-winning cyber security specialist, on a mission to provide organisations with complete visibility and total control over cyber risk.”

Source: company website · checked Sep 6, 2026
21
Stripe OLTPartial evidence
Bristol, United KingdomHQ checked Sep 6, 202651-20063

“From our offices in London, Bristol, and Manchester, Stripe OLT delivers cutting-edge cyber security and IT services to support and protect organisations in an ever-changing…”

Source: company website · checked Sep 6, 2026
22
DigitalxraidPartial evidence
Doncaster, United KingdomHQ checked Sep 6, 202651-20062

“At DigitalXRAID, we’re more than just a managed security services provider – we’re your trusted partner in safeguarding your business from cyber threats.”

Source: company website · checked Sep 6, 2026
23
E2e-AssureStrong evidence
Abingdon, United KingdomHQ checked Sep 6, 202651-20061

“e2e-assure is the UK's leading specialist in Managed Threat Detection and Response through our 24/7/365 UK owned and operated Security Operations Centre (SOC).”

Source: company website · checked Sep 6, 2026
24
Black Diamond SecurityPartial evidence
London, United KingdomHQ checked Sep 6, 2026201-50058

“Black Diamond Security - Safeguarding Your World.”

Source: company website · checked Sep 6, 2026
25Aldershot, United KingdomHQ checked Sep 6, 202651-20053

“Shield Security Services Limited was incorporated in 1986.”

Source: company website · checked Sep 6, 2026

Showing 25 of 578 security operations center companies based in the United Kingdom

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Security operations center companies based in the United Kingdom at a glance

As of Sep 6, 2026
11-50Median size (employees)
LondonLargest hub · 210 HQs
8,929Contacts with mobile numbers
Sep 6, 2026Data refreshed

Companies by employee count

1-10
276
11-50
189
51-200
83
201-500
19
501-1,000
5
1,001-5,000
2
5,001-10,000
1
10001+
2

Verified emails by last verification

0–30
5,152
31–60
374
61–90
3
90–180
1
180+
108

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 security operations center companies, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies
Companies headquartered in the United Kingdom whose own description of what they do matches “security operations center companies”. Matching reads each company's description, not its industry code or its name.
What we exclude
Companies whose own description does not clearly place them among security operations center companies, and records with no verified work email. Companies headquartered outside United Kingdom 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 an evidence 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, 5,638 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 6, 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.

Security operations center companies by metro

  • Security operations center companies in London210
  • Security operations center companies in Manchester25

Frequently asked

How many security operations center companies are there based in the United Kingdom?

RevenueBase identified 578 security operations center companies headquartered in the 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?

G4s, headquartered in London, tops this list with the largest team on record.

Which city has the most security operations center companies?

London leads with 210 headquartered companies, followed by Manchester (25) and Birmingham (12).

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 5,638 verified decision-maker contacts tracked across these 578 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 6, 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 SmartSearch, 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.