Company lists · Data refreshed September 2026

Top 25 Security compliance and audit companies based in London, United Kingdom

Name: Security compliance and audit companies based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 13, 2026 83 companies tracked

RevenueBase identified 83 security compliance and audit companies headquartered in London, United Kingdom as of September 2026 and tracks 1,176 professional contacts across them, including 190 with verified work emails and 41 with mobile numbers. London is the largest hub.

This list covers security compliance and audit companies 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 13, 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 13, 2026 86% judged on-target in blind review

83Companies

1,176Contacts tracked

190Verified emails

41Mobile numbers

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

Ranked by team size

Top 25 of 83 security compliance and audit companies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 13, 2026. RevenueBase Smart Search rates how each company's information relates to security compliance and audit companies: 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 13, 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 13, 2026
2	Bulletproof Cyber Security	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	123 contacts →
	Indirect evidence “Bulletproof is now part of WorkNest Secure.” Source: RevenueBase Database · checked Sep 13, 2026
3	LMS Security	Partial evidence	London, United KingdomHQ checked Sep 13, 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 13, 2026
4	Consultants Factory	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	20 contacts →
	Indirect evidence “We at CF assist enterprises manage IT risks better.” Source: RevenueBase Database · checked Sep 13, 2026
5	Forti5 Technologies	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	1-10	15 contacts →
	Indirect evidence “We help organisations keep their data safe, use technology responsibly, and stay on the right side of the law, without the jargon.” Source: RevenueBase Database · checked Sep 13, 2026
6	Everycloud AI & Data Security	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	14 contacts →
	Partial evidence “Demand more from your AI & Data Security partner.” Source: RevenueBase Database · checked Sep 13, 2026
7	Risk Crew	Indirect evidence	London, United KingdomHQ checked Sep 13, 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 13, 2026
8	Adoptech	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	13 contacts →
	Strong evidence “Our aim is to help businesses prepare for security audits and maintain ongoing compliance efficiently and effectively.” Source: RevenueBase Database · checked Sep 13, 2026
9	Locked Stack	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	1-10	8 contacts →
	Indirect evidence “Locked Stack is an independent cybersecurity consultancy and managed services firm headquartered in London, with a US subsidiary, operating across North America, Europe, and the…” Source: RevenueBase Database · checked Sep 13, 2026
10	Stratia Cyber	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	8 contacts →
	Partial evidence “Stratia Cyber is an independent, technology agnostic company providing high quality, pragmatic cyber security consultancy and expertise, is a founder member of the NCSC Certified…” Source: RevenueBase Database · checked Sep 13, 2026
11	Cortida	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	7 contacts →
	Indirect evidence “Through excellent consultancy we protect clients from reputation damage, financial penalties and the operational disruption associated with data incidents and cyberattacks.” Source: RevenueBase Database · checked Sep 13, 2026
12	Cybersrc Consultancy LTD	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	1-10	7 contacts →
	Partial evidence “CyberSRC specialises in 1LoD & 2LoD Operational & IT Risk, Security and Control Management & Transformation through developing, implementing, auditing, risk assessing and managing…” Source: RevenueBase Database · checked Sep 13, 2026
13	Deepfathom	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	1-10	7 contacts →
	Partial evidence “DeepFathom's next generation auditing is changing the face of compliance.” Source: RevenueBase Database · checked Sep 13, 2026
14	Meta Defence Labs LTD	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	1-10	5 contacts →
	Partial evidence “As a distinguished UK National Cyber Security Center (NCSC) Assured Services Provider and an authorised certification body for esteemed credentials such as Cyber Essentials, Cyber…” Source: RevenueBase Database · checked Sep 13, 2026
15	Laneden LTD	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	1-10	4 contacts →
	Partial evidence “We specialise in helping organisations identify security concerns and quantify the risks you may have across your assets, using Penetration Testing, Threat Simulation and…” Source: RevenueBase Database · checked Sep 13, 2026
16	Inavate Consulting LTD	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	3 contacts →
	Strong evidence “Inavate Consulting are experts in information security management and ISO 27001 implementation, helping organisations move beyond checkbox compliance to build robust…” Source: RevenueBase Database · checked Sep 13, 2026
17	Objects Consulting	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	1-10	3 contacts →
	Indirect evidence “Engage senior executives and technology teams in organizations to help understand then improve their cybersecurity maturity.” Source: RevenueBase Database · checked Sep 13, 2026
18	Metis Security LTD	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	1-10	3 contacts →
	Partial evidence “Metis Security is an independent UK cybersecurity consultancy specialising in Microsoft cloud security control effectiveness.” Source: RevenueBase Database · checked Sep 13, 2026
19	AKRUP	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	1-10	3 contacts →
	Partial evidence “The leader in Cybersecurity compliance.” Source: RevenueBase Database · checked Sep 13, 2026
20	Cetome	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	1-10	2 contacts →
	Indirect evidence “We make cyber work.” Source: RevenueBase Database · checked Sep 13, 2026
21	Netforte Consulting LTD	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	1-10	2 contacts →
	Strong evidence “Providing services such as: ISO 9001 Implementation ISO 27001 Implementation ISO 42001 Implementation Cyber Security Audits Penetration Testing Cloud Security VCISO Services SOC 2…” Source: RevenueBase Database · checked Sep 13, 2026
22	Velocity Check	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	1-10	2 contacts →
	Strong evidence “Check our compliance, ISO certification and cyber security services.” Source: RevenueBase Database · checked Sep 13, 2026
23	Enkrypta	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	1-10	1 contacts →
	Partial evidence “Organisations are increasingly operating in hostile environments which often leave them vulnerable to a number of security threats.” Source: RevenueBase Database · checked Sep 13, 2026
24	Onion Security LTD	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	1-10	1 contacts →
	Partial evidence “Onion Security Ltd is a London-based information security consultancy with 20 years of experience in cybersecurity for financial services.” Source: RevenueBase Database · checked Sep 13, 2026
25	Bayvision Limited	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	1-10	1 contacts →
	Partial evidence “Bayvision is specialised in providing Enterprise-wide Security and Data Privacy services to business, across multiple domains- Information Security - Privacy - Software…” Source: RevenueBase Database · checked Sep 13, 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: security compliance and audit companies. 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 security compliance and audit companies.
Partial evidence: Its own public description names part of security compliance and audit companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name security compliance and audit companies. 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 83 security compliance and audit companies based in London, United Kingdom

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

As of Sep 13, 2026

16.2%Verified-email coverage

3.5%Mobile-number coverage

14.2Average contacts per company

1-10Median size (employees)

101.2%Largest-city concentration · London

Sep 13, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 15.0d

1520–30

3531–60

361–90

090–180

0180+

Company record updated

Median 80.0d

00–30

29931–60

69061–90

14790–180

40180+

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 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 “security compliance and audit companies”. 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 security compliance and audit companies), 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 security compliance and audit companies, 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, 190 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 13, 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 in the United Kingdom

Security compliance and audit companies in London84

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 security compliance and audit companies, 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 security compliance and audit companies are there based in London, United Kingdom?

RevenueBase identified 83 security compliance and audit companies 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?

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 190 verified decision-maker contacts tracked across these 83 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 13, 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.