Company lists · Data refreshed September 2026

Top 25 Information security audit services based in the United Kingdom

Name: Information security audit services based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 269 companies tracked

RevenueBase identified 269 information security audit services headquartered in the United Kingdom as of September 2026 and tracks 3,333 professional contacts across them, including 604 with verified work emails. London is the largest hub.

This list covers information security audit 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. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 21, 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 21, 2026 86% judged on-target in blind review

269Companies

3,333Contacts tracked

604Verified emails

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The 25 largest information security audit services based in the United Kingdom

Ranked by team size

Top 25 of 269 information security audit services based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to information security audit services: 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	COBRA	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	n/a	705 contacts →
	Partial evidence “Get a free, powerful security assessment with personalised recommendations, the same analysis that costs from IT Consultancies.” Source: RevenueBase Database · checked Sep 21, 2026
2	Trpglobal	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	126 contacts →
	Indirect evidence “We are TRPGLOBAL, your strategic partner in helping you with the complexities of risk management.” Source: RevenueBase Database · checked Sep 21, 2026
3	Caretower An Integrity360 Company	Partial evidence	London, United KingdomHQ checked Sep 21, 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 21, 2026
4	Saepio Information Security	Partial evidence	High Wycombe, United KingdomHQ checked Sep 21, 2026	51-200	74 contacts →
	Partial evidence “Saepio increase awareness, reduce risk and improve security in a continually evolving threat landscape.” Source: RevenueBase Database · checked Sep 21, 2026
5	Dionach By Nomios	Strong evidence	Oxford, United KingdomHQ checked Sep 21, 2026	51-200	73 contacts →
	Strong evidence “Dionach by Nomios has over 25 years of expertise in information security, supporting organisations in building resilience against ever‑evolving cyber threats.” Source: RevenueBase Database · checked Sep 21, 2026
6	Cyberlab	Partial evidence	Alderley Edge, United KingdomHQ checked Sep 21, 2026	51-200	57 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 21, 2026
7	Secarma LTD	Indirect evidence	Manchester, United KingdomHQ checked Sep 21, 2026	11-50	36 contacts →
	Indirect evidence “Secarma exists to keep the world safe.” Source: RevenueBase Database · checked Sep 21, 2026
8	Aristi	Partial evidence	Birmingham, United KingdomHQ checked Sep 21, 2026	11-50	32 contacts →
	Partial evidence “Aristi is a specialist provider of cyber security services with over 17 years of experience.” Source: RevenueBase Database · checked Sep 21, 2026
9	Omnicyber Security	Strong evidence	Solihull, United KingdomHQ checked Sep 21, 2026	11-50	31 contacts →
	Strong evidence “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: RevenueBase Database · checked Sep 21, 2026
10	Procheckup PCU	Indirect evidence	Portsmouth, United KingdomHQ checked Sep 21, 2026	11-50	29 contacts →
	Indirect evidence “Imagine a world where cyber threats are simply another challenge that you're fully equipped to handle.” Source: RevenueBase Database · checked Sep 21, 2026
11	Cyber Security Specialists	Partial evidence	Altrincham, United KingdomHQ checked Sep 21, 2026	11-50	26 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 21, 2026
12	Smartsafe Consulting And Technology	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	26 contacts →
	Partial evidence “Our overarching aim is to safeguard your information so that you can focus on taking your business where you want it to go.” Source: RevenueBase Database · checked Sep 21, 2026
13	I3secure LTD	Strong evidence	Bristol, United KingdomHQ checked Sep 21, 2026	11-50	24 contacts →
	Strong evidence “i3Secure is a cyber security and information assurance consultancy protecting the confidentiality, integrity and availability of data across defence, public and private sectors.” Source: RevenueBase Database · checked Sep 21, 2026
14	Cybercrowd	Partial evidence	Newbury, United KingdomHQ checked Sep 21, 2026	11-50	23 contacts →
	Partial evidence “CyberCrowd are a market leader in the cyber security realm, offering everything from Assessment Services through to Pen Testing, CISOaaS, Certification Readiness, DPO services…” Source: RevenueBase Database · checked Sep 21, 2026
15	Chaleit	Partial evidence	Cambridge, United KingdomHQ checked Sep 21, 2026	11-50	21 contacts →
	Partial evidence “Chaleit is a cyber security management consultancy that aligns business context with real-world capability to solve complex risks.” Source: RevenueBase Database · checked Sep 21, 2026
16	LMS Security	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	20 contacts →
	Partial evidence “LMS Security are a fully Independent, privately owned, Internationally recognised and accredited Security Consultancy; owned and built by Electronic and Physical Security…” Source: RevenueBase Database · checked Sep 21, 2026
17	Rightcue	Indirect evidence	Basingstoke, United KingdomHQ checked Sep 21, 2026	11-50	20 contacts →
	Indirect evidence “We help organisations achieve business-focused cybersecurity compliance across various industry and regulatory frameworks with successful stakeholder management, particularly in…” Source: RevenueBase Database · checked Sep 21, 2026
18	Consultants Factory	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	20 contacts →
	Indirect evidence “We at CF assist enterprises manage IT risks better.” Source: RevenueBase Database · checked Sep 21, 2026
19	Razorthorn Security	Partial evidence	Tunbridge Wells, United KingdomHQ checked Sep 21, 2026	11-50	19 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 21, 2026
20	Halo I.S	Indirect evidence	Leeds, United KingdomHQ checked Sep 21, 2026	11-50	19 contacts →
	Indirect evidence “Halo I.S is not just another cybersecurity organization based in the UK; we're a testament to evolution and client-centric innovation.” Source: RevenueBase Database · checked Sep 21, 2026
21	Bruce & Butler	Partial evidence	Sheffield, United KingdomHQ checked Sep 21, 2026	11-50	15 contacts →
	Partial evidence “Bruce & Butler Limited are your partners in Data Protection & Cyber Security.” Source: RevenueBase Database · checked Sep 21, 2026
22	Risk Crew	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	14 contacts →
	Indirect evidence “Risk Crew is known for their vision, innovative thinking and facility to embrace change.” Source: RevenueBase Database · checked Sep 21, 2026
23	Cyber Guarded LTD	Partial evidence	Belfast, United KingdomHQ checked Sep 21, 2026	11-50	12 contacts →
	Partial evidence “Cyber Guarded is a vendor independent business which provides Cyber Security auditing and testing services.” Source: RevenueBase Database · checked Sep 21, 2026
24	Infosec Partners	Partial evidence	Winchester, United KingdomHQ checked Sep 21, 2026	11-50	12 contacts →
	Partial evidence “Security Consultants at Infosec Partners are formally trained to a high degree, having at least one of the following Security Management certifications: CESG CLAS, CISSP, CISM…” Source: RevenueBase Database · checked Sep 21, 2026
25	2-Sec	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	11 contacts →
	Strong evidence “At 2\|SEC Consulting, we deliver an end-to-end service of cyber and information security solutions which are tailored to each client’s exact security needs.” Source: RevenueBase Database · checked Sep 21, 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: information security audit services. 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 information security audit services.
Partial evidence: Its own public description names part of information security audit services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name information security audit services. 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 269 information security audit services based in the United Kingdom

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Information security audit services based in the United Kingdom at a glance

As of Sep 21, 2026

18.1%Verified-email coverage

12.4Average contacts per company

1-10Median size (employees)

29.4%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

190

11-50

51-200

201-500

501-1,000

5,001-10,000

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 269 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 information security audit services, 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 the United Kingdom whose own description of what they do matches “information security audit services”. 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 information security audit services), 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 information security audit services, 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 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, 604 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 21, 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.

Information security audit services by metro

Information security audit services in London79

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 information security audit services, 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 information security audit services are there based in the United Kingdom?

RevenueBase identified 269 information security audit services 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 information security audit services?

London leads with 79 headquartered companies, followed by Manchester (10) and Birmingham (5).

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 604 verified decision-maker contacts tracked across these 269 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 21, 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.