Company lists · Data refreshed September 2026

Top 25 Security consulting companies based in London, United Kingdom

Name: Security consulting 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 540 companies tracked

RevenueBase identified 540 security consulting companies headquartered in London, United Kingdom as of September 2026 and tracks 5,676 professional contacts across them, including 1,168 with verified work emails and 336 with mobile numbers. London is the largest hub.

This list covers security consulting 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

540Companies

5,676Contacts tracked

1,168Verified emails

336Mobile numbers

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest security consulting companies based in London, United Kingdom

Ranked by team size

Top 25 of 540 security consulting 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 consulting 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	Ward Security	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	1,001-5,000	419 contacts →
	Partial evidence “Ward is an award winning, privately owned business, providing bespoke risk and security solutions including protective security personnel, explosive search dogs, narcotic search…” Source: RevenueBase Database · checked Sep 13, 2026
3	Obrela	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	201-500	242 contacts →
	Partial evidence “Obrela Security Industries is a global provider of cyber security services.” Source: RevenueBase Database · checked Sep 13, 2026
4	Turnkey Consulting	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	134 contacts →
	Strong evidence “Turnkey Consulting brings together people, protection, and performance to help the world’s leading companies understand and optimize their risk and security landscape.” Source: RevenueBase Database · checked Sep 13, 2026
5	Trpglobal	Indirect evidence	London, United KingdomHQ checked Sep 13, 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 13, 2026
6	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
7	Caretower An Integrity360 Company	Partial evidence	London, United KingdomHQ checked Sep 13, 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 13, 2026
8	ITC Secure	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	87 contacts →
	Partial evidence “ITC Secure is an advisory-led cyber security services company.” Source: RevenueBase Database · checked Sep 13, 2026
9	Daintta	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	60 contacts →
	Indirect evidence “We provide deep expertise with technical and business specialists to help clients secure and protect the UK.” Source: RevenueBase Database · checked Sep 13, 2026
10	Black Diamond Security	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	201-500	58 contacts →
	Partial evidence “Black Diamond Security - Safeguarding Your World.” Source: RevenueBase Database · checked Sep 13, 2026
11	Hexegic	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	52 contacts →
	Indirect evidence “At Hexegic we are not just passionate about protecting data through our Cyber services we are passionate about helping companies release the potential of the data they hold…” Source: RevenueBase Database · checked Sep 13, 2026
12	Custom Intelligent Security	Partial evidence	London, United KingdomHQ checked Sep 13, 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 13, 2026
13	GSA Global	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	49 contacts →
	Partial evidence “GSA Global helps organisations, families and individuals respond to serious, complex and emerging security risks.” Source: RevenueBase Database · checked Sep 13, 2026
14	Frankton Group LTD	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	48 contacts →
	Indirect evidence “In today’s complex threat environment, businesses, individuals, and organisations require trusted partners to provide the ultimate assurance that their assets are well protected.” Source: RevenueBase Database · checked Sep 13, 2026
15	Cornerstone	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	44 contacts →
	Strong evidence “CornerStone is an award winning, independent, security and digital building consulting firm with headquarters in the UK.” Source: RevenueBase Database · checked Sep 13, 2026
16	Ak9 Security And FM Solutions LTD	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	501-1,000	43 contacts →
	Partial evidence “AK9 Security and FM Solutions offers comprehensive security solutions for businesses, governmental organizations, and residential areas.” Source: RevenueBase Database · checked Sep 13, 2026
17	Gratte Brothers Security Systems & Software	Partial evidence	London, United KingdomHQ checked Sep 13, 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 13, 2026
18	Secforce LTD	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	39 contacts →
	Strong evidence “SECFORCE are vendor independent offensive security specialists providing effective business risk intelligence and strategic security consulting.” Source: RevenueBase Database · checked Sep 13, 2026
19	Audere Group	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	37 contacts →
	Indirect evidence “Audere Group is a London-headquartered holistic risk advisory company founded in 2014.” Source: RevenueBase Database · checked Sep 13, 2026
20	Team Fusion LTD	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	34 contacts →
	Partial evidence “Our elite teams offer bespoke, integrated security solutions that adapt and react to the evolving threat landscape.” Source: RevenueBase Database · checked Sep 13, 2026
21	Othrys	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	33 contacts →
	Indirect evidence “Othrys is a global strategic and risk advisory firm founded in 2016.” Source: RevenueBase Database · checked Sep 13, 2026
22	Cyber Rescue Alliance	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	1-10	29 contacts →
	Indirect evidence “Cyber Rescue is a leading specialist in helping Boardroom Executives to measure, monitor and mitigate potential harm from cyber-attacks.” Source: RevenueBase Database · checked Sep 13, 2026
23	J2 Mssp	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	29 contacts →
	Partial evidence “Cyber security is the modern business' greatest risk.” Source: RevenueBase Database · checked Sep 13, 2026
24	Se24	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	24 contacts →
	Partial evidence “A core member of the Chelsea Group Security & Crisis Management Division, Security Exchange is dedicated to the provision of specialist consultancy on a worldwide basis…” Source: RevenueBase Database · checked Sep 13, 2026
25	Toro Solutions	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	23 contacts →
	Indirect evidence “Toro was founded on creating the UK's first Red Team penetration test - and then attacking hundreds of clients by hacking their systems, influencing / social engineering staff and…” 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 consulting 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 consulting companies.
Partial evidence: Its own public description names part of security consulting companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name security consulting 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 540 security consulting companies based in London, United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 1,168 reachable decision-makers.

Free signup · no credit card

View the full list →

Security consulting companies based in London, United Kingdom at a glance

As of Sep 13, 2026

20.6%Verified-email coverage

5.9%Mobile-number coverage

10.5Average contacts per company

1-10Median size (employees)

81.9%Largest-city concentration · London

Sep 13, 2026Page data refreshed

Companies by employee count

1-10

326

11-50

147

51-200

201-500

501-1,000

1,001-5,000

Freshness & accuracy

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

Email last verified

Median 15.0d

9290–30

23031–60

761–90

090–180

2180+

Company record updated

Median 78.0d

00–30

1,66731–60

2,93461–90

78890–180

287180+

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 consulting 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 consulting 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 consulting 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 consulting 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, 1,168 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 consulting companies by metro in the United Kingdom

Security consulting companies in London442
Security consulting companies in Manchester30

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 consulting 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 consulting companies are there based in London, United Kingdom?

RevenueBase identified 540 security consulting 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 consulting companies?

London leads with 442 headquartered companies, followed by Manchester (30) and Birmingham (22).

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 1,168 verified decision-maker contacts tracked across these 540 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.

Ready to reach these companies? Verified emails and direct dials for all 540 security consulting companies based in London, United Kingdom. Start with a free account, no credit card.

Download this list →

Related lists

Security consulting companies by geography

Browse the directory

Browse: Companies home · Security consulting companies in United Kingdom · All United Kingdom lists · All Security consulting companies lists · New lists

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.