Company lists · Data refreshed September 2026

Top 25 Iso 27001 information security consultants based in London, United Kingdom

Name: Iso 27001 information security consultants based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 220 companies tracked

RevenueBase identified 220 iso 27001 information security consultants headquartered in London, United Kingdom as of September 2026 and tracks 2,138 professional contacts across them, including 476 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers iso 27001 information security consultants 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 28, 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 28, 2026 86% judged on-target in blind review

220Companies

2,138Contacts tracked

476Verified emails

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The 25 largest iso 27001 information security consultants based in London, United Kingdom

Ranked by team size

Top 25 of 220 iso 27001 information security consultants based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to iso 27001 information security consultants: 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	operum.tech	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	n/a	186 contacts →
	Indirect evidence “IT support for businesses in London.” Source: RevenueBase Database · checked Sep 28, 2026
2	Turnkey Consulting	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	134 contacts →
	Partial 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 28, 2026
3	Trpglobal	Indirect evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
4	Caretower An Integrity360 Company	Partial evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
5	Cyro Cyber	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	62 contacts →
	Partial evidence “Cyro Cyber are your cyber security Guardians.” Source: RevenueBase Database · checked Sep 28, 2026
6	Cornerstone	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	44 contacts →
	Partial evidence “CornerStone is an award winning, independent, security and digital building consulting firm with headquarters in the UK.” Source: RevenueBase Database · checked Sep 28, 2026
7	Secforce LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	39 contacts →
	Partial evidence “SECFORCE are vendor independent offensive security specialists providing effective business risk intelligence and strategic security consulting.” Source: RevenueBase Database · checked Sep 28, 2026
8	Harptec LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	22 contacts →
	Partial evidence “We are a Cyber and Compliance focused Engineering company helping companies to achieve ISO standards and supporting the implementation of these standards through cutting-edge…” Source: RevenueBase Database · checked Sep 28, 2026
9	LMS Security	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	20 contacts →
	Strong 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 28, 2026
10	NGS Next Generation Security	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	20 contacts →
	Partial evidence “Formed in 2018, NGS (UK) Ltd are independent, Next Generation Security trusted advisors, providing all-encompassing solutions from the perimeter to the endpoint.” Source: RevenueBase Database · checked Sep 28, 2026
11	Consultants Factory	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	20 contacts →
	Indirect evidence “We at CF assist enterprises manage IT risks better.” Source: RevenueBase Database · checked Sep 28, 2026
12	Panoramic Synergy Enterprises LTD	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	19 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026
13	CFE Certification	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	18 contacts →
	Strong evidence “We provide a wide range of auditing, certification and gap analysis services on; AI, DORA, NIS2, Information Security, Business Continuity, International IT Service, GDPR and…” Source: RevenueBase Database · checked Sep 28, 2026
14	Blackmores UK LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	17 contacts →
	Partial evidence “ISO Standards can help you improve efficiency, reduce costs and increase tender opportunities.” Source: RevenueBase Database · checked Sep 28, 2026
15	Forti5 Technologies	Indirect evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
16	Alltime Technologies Limited	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	15 contacts →
	Strong evidence “Alltime Technologies Limited is a London based Cyber Security focused Managed Services and Consultancy provider.” Source: RevenueBase Database · checked Sep 28, 2026
17	Risk Crew	Indirect evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
18	2-Sec	Strong evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
19	CNS	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	11 contacts →
	Strong evidence “CNS helps UK organisations reduce the risk of cyber attack and achieve greater certainty and control of information security systems, processes and compliance.” Source: RevenueBase Database · checked Sep 28, 2026
20	Secureteam LTD	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	10 contacts →
	Strong evidence “SecureTeam are a UK-based information security practice, specialising in all areas of cybersecurity.” Source: RevenueBase Database · checked Sep 28, 2026
21	Pentiq	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	10 contacts →
	Partial evidence “We are a UK-based Cyber Security company offering a comprehensive portfolio specialising in innovative solutions for Penetration Testing, Training, Compliance, Consulting, and…” Source: RevenueBase Database · checked Sep 28, 2026
22	NO Problem IT	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	10 contacts →
	Indirect evidence “No Problem IT is an ISO27001 certified Managed IT Services provider with over 20 years experience providing all aspects of IT Business services across South and Central London.” Source: RevenueBase Database · checked Sep 28, 2026
23	Locked Stack	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	8 contacts →
	Partial 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 28, 2026
24	Stratia Cyber	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	8 contacts →
	Strong 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 28, 2026
25	Assured Clarity Limited	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	7 contacts →
	Strong evidence “We are a global consultancy firm that specializes in Digital Risk Management and Data Privacy/Data Protection, while also ensuring robust Cyber Security measures for our clients.” Source: RevenueBase Database · checked Sep 28, 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: iso 27001 information security consultants. 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 iso 27001 information security consultants.
Partial evidence: Its own public description names part of iso 27001 information security consultants, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name iso 27001 information security consultants. 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 220 iso 27001 information security consultants based in London, United Kingdom

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Iso 27001 information security consultants based in London, United Kingdom at a glance

As of Sep 28, 2026

22.3%Verified-email coverage

9.7Average contacts per company

1-10Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

158

11-50

51-200

201-500

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 220 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 iso 27001 information security consultants, 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 “iso 27001 information security consultants”. 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 iso 27001 information security consultants), 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 iso 27001 information security consultants, 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, 476 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 28, 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.

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 iso 27001 information security consultants, 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 iso 27001 information security consultants are there based in London, United Kingdom?

RevenueBase identified 220 iso 27001 information security consultants 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?

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

Which city in the United Kingdom has the most iso 27001 information security consultants?

London leads the United Kingdom with 220 headquartered companies, followed by Birmingham (19) and Manchester (19).

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 476 verified decision-maker contacts tracked across these 220 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 28, 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.