Company lists · Data refreshed September 2026

Top 25 Security compliance and audit companies based in the United Kingdom

RevenueBase identified 299 security compliance and audit companies headquartered in the United Kingdom as of September 2026 and tracks 2,588 professional contacts across them, including 579 with verified work emails and 121 with mobile numbers. London is the largest hub.

This list covers security compliance and audit 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
299Companies
2,588Contacts tracked
579Verified emails
121Mobile numbers
Explore all 299 companies → Free signup · no credit card · 500 free credits

The 25 largest security compliance and audit companies based in the United Kingdom

Ranked by team size
Top 25 of 299 security compliance and audit 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 compliance and audit 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
COBRAPartial evidence
London, United KingdomHQ checked Sep 6, 2026n/a705

“Get a free, powerful security assessment with personalised recommendations, the same analysis that costs from IT Consultancies.”

Source: company website · checked Sep 6, 2026
2
The Citation GroupPartial evidence
Wilmslow, United KingdomHQ checked Sep 6, 20261,001-5,000291

“The Citation Group offer unrivalled compliance and quality services to over businesses across the UK, Australia, New Zealand, and Canada.”

Source: company website · checked Sep 6, 2026
3
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
4
CyberlabPartial evidence
Alderley Edge, United KingdomHQ checked Sep 6, 202651-20057

“CyberLab is the UK-leading cyber security consultancy and managed services provider, trusted by over 1,200 enterprise businesses, government departments, and household names to…”

Source: company website · checked Sep 6, 2026
5Glasgow, United KingdomHQ checked Sep 6, 202651-20050

“International Associates (IA) is a leading provider of assessment, audit, verification, certification and training services.”

Source: company website · checked Sep 6, 2026
6
Omnicyber SecurityStrong evidence
Solihull, United KingdomHQ checked Sep 6, 202611-5031

“SPECIALISTS IN IT SECURITY AND COMPLIANCE Our goal is to help customers define, develop and implement information security and compliance services, no matter what stage of the…”

Source: company website · checked Sep 6, 2026
7Altrincham, United KingdomHQ checked Sep 6, 202611-5026

“Based in Manchester UK, we are an independent Cyber Security Consultancy providing Security services across a wide range of markets, from multi-national Corporate Organisations…”

Source: company website · checked Sep 6, 2026
8
I3secure LTDPartial evidence
Bristol, United KingdomHQ checked Sep 6, 202611-5024

“i3Secure is a cyber security and information assurance consultancy protecting the confidentiality, integrity and availability of data across defence, public and private sectors.”

Source: company website · checked Sep 6, 2026
9
AMR CybersecurityPartial evidence
Cheltenham, United KingdomHQ checked Sep 6, 202611-5023

“AMR CyberSecurity delivers next generation cyber security services to assist organisations across a wide variety of sectors in understanding potential threats and effectively…”

Source: company website · checked Sep 6, 2026
10
Advent IMPartial evidence
Halesowen, United KingdomHQ checked Sep 6, 202611-5021

“Advent IM is the UK’s leading independent GRC information and physical security consultancy and training provider.”

Source: company website · checked Sep 6, 2026
11
LMS SecurityPartial evidence
London, United KingdomHQ checked Sep 6, 202611-5020

“LMS Security are a fully Independent, privately owned, Internationally recognised and accredited Security Consultancy; owned and built by Electronic and Physical Security…”

Source: company website · checked Sep 6, 2026
12Leeds, United KingdomHQ checked Sep 6, 202611-5020

“One Compliance are data privacy & cyber security specialists that focus on improving our clients security posture so that they can prioritise and mitigate security risks…”

Source: company website · checked Sep 6, 2026
13
RightcuePartial evidence
Basingstoke, United KingdomHQ checked Sep 6, 202611-5020

“We help organisations achieve business-focused cybersecurity compliance across various industry and regulatory frameworks with successful stakeholder management, particularly in…”

Source: company website · checked Sep 6, 2026
14
Consultants FactoryIndirect evidence
London, United KingdomHQ checked Sep 6, 202611-5020

“We at CF assist enterprises manage IT risks better.”

Source: company website · checked Sep 6, 2026
15
Razorthorn SecurityPartial evidence
Tunbridge Wells, United KingdomHQ checked Sep 6, 202611-5019

“Razorthorn Security is a specialist cybersecurity consultancy founded in 2007, with nearly two decades of experience helping organisations protect their data, their systems and…”

Source: company website · checked Sep 6, 2026
16
VeriservStrong evidence
Cannock, United KingdomHQ checked Sep 6, 202651-20017

“Veriserv operate nationally helping businesses ensure their workplace is safe and meets electrical, fire, security and mechanical compliance standards.”

Source: company website · checked Sep 6, 2026
17
Bruce & ButlerPartial evidence
Sheffield, United KingdomHQ checked Sep 6, 202611-5015

“Bruce & Butler Limited are your partners in Data Protection & Cyber Security.”

Source: company website · checked Sep 6, 2026
18
Forti5 TechnologiesIndirect evidence
London, United KingdomHQ checked Sep 6, 20261-1015

“We help organisations keep their data safe, use technology responsibly, and stay on the right side of the law, without the jargon.”

Source: company website · checked Sep 6, 2026
19London, United KingdomHQ checked Sep 6, 202611-5014

“Demand more from your AI & Data Security partner.”

Source: company website · checked Sep 6, 2026
20
Risk CrewIndirect evidence
London, United KingdomHQ checked Sep 6, 202611-5014

“Risk Crew is known for their vision, innovative thinking and facility to embrace change.”

Source: company website · checked Sep 6, 2026
21
Glocert InternationalIndirect evidence
London, United KingdomHQ checked Sep 6, 202611-5014

“Glocert International is an emerging leader in the Testing, Inspection and Certification (TIC) industry.”

Source: company website · checked Sep 6, 2026
22
Safe Harbour SecurityStrong evidence
Derry/londonderry, United KingdomHQ checked Sep 6, 20261-1014

“Safe Harbour Security specialise in penetration testing, ISO consultancy, and governance, risk, and compliance (GRC) services.”

Source: company website · checked Sep 6, 2026
23
AdoptechStrong evidence
London, United KingdomHQ checked Sep 6, 202611-5013

“Our aim is to help businesses prepare for security audits and maintain ongoing compliance efficiently and effectively.”

Source: company website · checked Sep 6, 2026
24Stockport, United KingdomHQ checked Sep 6, 20261-1013

“Candy Management Consultants has been aiding companies in attaining ISO Certification and ensuring Health and Safety compliance since 2017.”

Source: company website · checked Sep 6, 2026
25
Cyber Guarded LTDPartial evidence
Belfast, United KingdomHQ checked Sep 6, 202611-5012

“Cyber Guarded is a vendor independent business which provides Cyber Security auditing and testing services.”

Source: company website · checked Sep 6, 2026

Showing 25 of 299 security compliance and audit companies based in the United Kingdom

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Security compliance and audit companies based in the United Kingdom at a glance

As of Sep 6, 2026
1-10Median size (employees)
LondonLargest hub · 84 HQs
121Contacts with mobile numbers
Sep 6, 2026Data refreshed

Companies by employee count

1-10
217
11-50
64
51-200
12
201-500
1
501-1,000
2
1,001-5,000
1
5,001-10,000
1

Verified emails by last verification

0–30
526
31–60
52
61–90
1
90–180
0
180+
0

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 compliance and audit 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 compliance and audit 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 compliance and audit 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, 579 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 compliance and audit companies by metro

  • Security compliance and audit companies in London84

Frequently asked

How many security compliance and audit companies are there based in the United Kingdom?

RevenueBase identified 299 security compliance and audit 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?

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

Which city has the most security compliance and audit companies?

London leads with 84 headquartered companies, followed by Birmingham (7) and Manchester (6).

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 579 verified decision-maker contacts tracked across these 299 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.

Ready to reach these companies? Verified emails and direct dials for all 299 security compliance and audit companies based in the United Kingdom. Start with a free account, no credit card.

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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.