Company lists · Data refreshed October 2026

Top 25 Cybersecurity consulting service providers based in London, United Kingdom

Name: Cybersecurity consulting service providers based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 1, 2026 823 companies tracked

RevenueBase identified 823 company matches for cybersecurity consulting service providers associated with London, United Kingdom as of October 2026 and tracks 8,683 professional contacts across them, including 2,634 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers company matches for cybersecurity consulting service providers associated with London, United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed October 1, 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 RevenueBase SmartSearch · Exact Recorded Oct 1, 2026 How this list was built

823Companies

8,683Contacts tracked

2,634Verified emails

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The 25 largest cybersecurity consulting service providers based in London, United Kingdom

Ranked by team size

Top 25 of 823 company matches for cybersecurity consulting service providers based in London, United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 1, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	S-Rm	Exact match	London, United KingdomHQ recorded Oct 1, 2026	201-500	351 contacts →
	Exact match “S-RM is a global intelligence and cyber security consultancy.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
2	Obrela	Exact match	London, United KingdomHQ recorded Oct 1, 2026	201-500	242 contacts →
	Exact match “Obrela Security Industries is a global provider of cyber security services.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
3	Intragen	Exact match	London, United KingdomHQ recorded Oct 1, 2026	201-500	190 contacts →
	Exact match “Intragen is a cyber security business focused on managed Identity solutions and services.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
4	Deepcytes Cyber Labs UK	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	177 contacts →
	Exact match “Whether you’re a business or an individual, digital threats to your precious data and assets can come in any form - external or internal.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
5	Turnkey Consulting	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	134 contacts →
	Exact match “Turnkey Consulting brings together people, protection, and performance to help the world’s leading companies understand and optimize their risk and security landscape.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
6	Trpglobal	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	126 contacts →
	Exact match “We are TRPGLOBAL, your strategic partner in helping you with the complexities of risk management.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
7	Bulletproof Cyber Security	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	123 contacts →
	Exact match “Bulletproof is now part of WorkNest Secure.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
8	Doherty Associates	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	113 contacts →
	Exact match “Doherty Associates is a Managed Service Provider delivering IT support, cyber security and AI enablement ‘beyond the call’.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
9	Conosco	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	105 contacts →
	Exact match “Cybersecurity specialists providing technology and telecoms solutions that gives you the leadership, experience and resilience you need to build and secure the future of work.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
10	Oryxalign	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	99 contacts →
	Exact match “OryxAlign creates true alignment that delivers the right outcomes for all.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
11	Caretower An Integrity360 Company	Exact match	London, United KingdomHQ recorded Oct 1, 2026	201-500	97 contacts →
	Exact match “As an independent IT security specialist, Caretower provide comprehensive solutions to individual problems, thus allowing our recommendations to be unbiased.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
12	Cyberone	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	96 contacts →
	Exact match “CyberOne is a Microsoft Security Elite Partner and one of only 100 global Microsoft partners recognised with Microsoft-Verified Managed XDR solution status.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
13	ITC Secure	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	87 contacts →
	Exact match “ITC Secure is an advisory-led cyber security services company.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
14	Cybersmart	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	84 contacts →
	Exact match “Cybersecurity should be simple.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
15	Baseel Partners	Exact match	London, United KingdomHQ recorded Oct 1, 2026	1,001-5,000	78 contacts →
	Exact match “We offer a broad portfolio of IT and consulting services covering Governance and Strategy, Cloud, Data, Cybersecurity, Infrastructure and Applications, Managed IT and Security.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
16	White HAT An Epam Company	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	77 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
17	Sytel Reply	Exact match	London, United KingdomHQ recorded Oct 1, 2026	11-50	68 contacts →
	Exact match “Sytel Reply is the Reply Company focused on Networks and Security.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
18	Covertswarm	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	64 contacts →
	Exact match “YOU DESERVE TO BE HACKED®.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
19	Cyro Cyber	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	62 contacts →
	Exact match “Cyro Cyber are your cyber security Guardians.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
20	Techforing	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	61 contacts →
	Exact match “TechForing is a global leader in cybersecurity, dedicated to protecting digital assets and ensuring a safer cyberspace for businesses and individuals.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
21	Daintta	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	60 contacts →
	Exact match “We provide deep expertise with technical and business specialists to help clients secure and protect the UK.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
22	Insoft Services	Exact match	London, United KingdomHQ recorded Oct 1, 2026	201-500	60 contacts →
	Exact match “Insoft Services specializes in elevating IT infrastructure resilience and security, focusing on the critical domains of IT networking, data center infrastructure, cybersecurity…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
23	Garrison NOW A Part Of Everfox	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	60 contacts →
	Exact match “Garrison is a London-based cybersecurity company founded in 2014 by David Garfield (CEO) and Henry Harrison (Chief Scientist).” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
24	Riversafe	Exact match	London, United KingdomHQ recorded Oct 1, 2026	11-50	57 contacts →
	Exact match “We deliver services in Cybersecurity, Application Security and DevOps and are trusted by some of the world’s leading brands to maximise the value of their security investments and…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
25	Cyberowl	Exact match	London, United KingdomHQ recorded Oct 1, 2026	51-200	52 contacts →
	Exact match “CyberOwl helps asset operators in the maritime and critical national infrastructure sectors gain visibility, cyber security and cyber compliance of systems on their distributed…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “cybersecurity consulting service providers”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 823 cybersecurity consulting service providers based in London, United Kingdom

See the full list, filter by size, metro and specialty, and access 2,634 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Cybersecurity consulting service providers based in London, United Kingdom at a glance

As of Oct 1, 2026

30.3%Verified-email coverage

10.6Average contacts per company

1-10Median size (employees)

Oct 1, 2026Page data refreshed

Companies by employee count

1-10

489

11-50

244

51-200

201-500

501-1,000

1,001-5,000

10001+

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 823 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

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: Company records associated with London, United Kingdom whose business descriptions match “cybersecurity consulting service providers” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 2,634 professional contacts with verified work emails across the full matched dataset. 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 October 1, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Cybersecurity consulting service providers by metro in the United Kingdom

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “cybersecurity consulting service providers”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many cybersecurity consulting service providers are there based in London, United Kingdom?

RevenueBase identified 823 company matches for cybersecurity consulting service providers associated with London, United Kingdom as of October 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

S-Rm tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United Kingdom has the most cybersecurity consulting service providers?

London leads the United Kingdom with 823 company records, followed by Manchester (72) and Birmingham (43).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 2,634 professional contacts with verified work emails tracked across these 823 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on October 1, 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.