Company lists · Data refreshed September 2026

Top 25 Manhattan cybersecurity firms based in the United Kingdom

Name: Manhattan cybersecurity firms 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 148 companies tracked

RevenueBase identified 148 company matches for manhattan cybersecurity firms associated with the United Kingdom as of September 2026 and tracks 2,912 professional contacts across them, including 825 with verified work emails. London is the largest hub.

This list covers company matches for manhattan cybersecurity firms associated with the 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 September 21, 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 Sep 21, 2026 How this list was built

148Companies

2,912Contacts tracked

825Verified emails

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The 25 largest manhattan cybersecurity firms based in the United Kingdom

Ranked by team size

Top 25 of 148 company matches for manhattan cybersecurity firms based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 21, 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	Securityhq	Exact match	London, United KingdomHQ recorded Sep 21, 2026	501-1,000	502 contacts →
	Exact match “SecurityHQ, a global cybersecurity company pioneering Security Performance Engineering for stronger operational performance and resilience.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
2	Cyberfort	Exact match	Thatcham, United KingdomHQ recorded Sep 21, 2026	51-200	159 contacts →
	Exact match “At Cyberfort we are passionate about the cyber security services we deliver for our customers which keeps their people, data, systems and technology infrastructure secure…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
3	Wavenet Cyberguard	Exact match	Stourport-on-severn, United KingdomHQ recorded Sep 21, 2026	201-500	86 contacts →
	Exact match “CyberGuard Technologies is the security division of Wavenet.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
4	Foregenix	Exact match	Swindon, United KingdomHQ recorded Sep 21, 2026	51-200	80 contacts →
	Exact match “When your business relies on security, compliance and a strong reputation for taking care of your customers, you need a partner that understands your ethos, your challenges and…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
5	Reliance Cyber	Exact match	Waterloo, United KingdomHQ recorded Sep 21, 2026	51-200	80 contacts →
	Exact match “At Reliance Cyber, we believe in truly partnering with our customers.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
6	Hexegic	Exact match	London, United KingdomHQ recorded Sep 21, 2026	51-200	52 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
7	Adarma Security	Exact match	Edinburgh, United KingdomHQ recorded Sep 21, 2026	201-500	51 contacts →
	Exact match “We are Adarma, independent leaders in detection and response services.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
8	Core To Cloud	Exact match	Cirencester, United KingdomHQ recorded Sep 21, 2026	11-50	39 contacts →
	Exact match “We help organisations understand, optimise, and strengthen their cybersecurity.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
9	Mitigo Group	Exact match	Cheadle, United KingdomHQ recorded Sep 21, 2026	51-200	38 contacts →
	Exact match “Mitigo Group keeps professional services firms safe from cyberattack and operationally resilient.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
10	Ergos UK	Exact match	Crawley, United KingdomHQ recorded Sep 21, 2026	11-50	35 contacts →
	Exact match “ERGOS is an award-winning IT Managed Service Provider.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
11	Intrinsic Security	Exact match	Peterborough, United KingdomHQ recorded Sep 21, 2026	51-200	32 contacts →
	Exact match “Intrinsic Security is a UK-headquartered cybersecurity firm delivering 24/7 threat detection, incident response, and resilience across cloud, hybrid, OT, IoT, and identity…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
12	Procheckup PCU	Exact match	Portsmouth, United KingdomHQ recorded Sep 21, 2026	11-50	29 contacts →
	Exact match “Imagine a world where cyber threats are simply another challenge that you're fully equipped to handle.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
13	Encode	Exact match	London, United KingdomHQ recorded Sep 21, 2026	51-200	25 contacts →
	Exact match “Encode is now part of Obrela Security Industries collectively delivering cutting edge Cyber Security Services, empowering organizations to better protect against cyber threats.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
14	Toro Solutions	Exact match	London, United KingdomHQ recorded Sep 21, 2026	11-50	23 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
15	Blue Cube Security LTD	Exact match	East Grinstead, United KingdomHQ recorded Sep 21, 2026	11-50	22 contacts →
	Exact match “Blue Cube Security is a trusted UK cyber security partner with over 25 years of experience helping organisations stay secure in an increasingly complex digital world.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
16	Sinevis	Exact match	London, United KingdomHQ recorded Sep 21, 2026	11-50	17 contacts →
	Exact match “We are a leading cybersecurity services organization with more than a decade of proven expertise in consulting, solution implementation and managed services.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
17	Datasixth Consulting	Exact match	London, United KingdomHQ recorded Sep 21, 2026	51-200	15 contacts →
	Exact match “Who We Are DataSixth delivers Cybersecurity Intelligence.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
18	Socguardians LTD	Exact match	London, United KingdomHQ recorded Sep 21, 2026	11-50	13 contacts →
	Exact match “Our mission at SOCGuardians is to empower organizations to operate confidently in a digital world by providing cutting-edge cybersecurity services.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
19	Cyber Armed Security	Exact match	London, United KingdomHQ recorded Sep 21, 2026	11-50	12 contacts →
	Exact match “At Cyber Armed Security, we protect organisations worldwide from evolving cyber threats through intelligence-driven ethical hacking.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
20	Disclosure Cybersecurity	Exact match	London, United KingdomHQ recorded Sep 21, 2026	11-50	11 contacts →
	Exact match “Disclosure Cybersecurity Ltd is a specialist cyber security company, formed by professionals with extensive experience and wide exposure in the cyber security market.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
21	Koncise	Exact match	Borehamwood, United KingdomHQ recorded Sep 21, 2026	1-10	9 contacts →
	Exact match “Award-winning cybersecurity partner.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
22	Equilibrium Security	Exact match	Birmingham, United KingdomHQ recorded Sep 21, 2026	11-50	9 contacts →
	Exact match “At Equilibrium Security, we’re a team of certified Cyber Security experts dedicated to keeping your business safe.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
23	Defensityone	Exact match	Milton Keynes, United KingdomHQ recorded Sep 21, 2026	11-50	9 contacts →
	Exact match “DefensityOne is a cybersecurity solutions provider specializing in proactive threat detection, risk management, and digital defense services.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
24	Hytec Information Security, A Civica Company	Exact match	Teddington, United KingdomHQ recorded Sep 21, 2026	11-50	8 contacts →
	Exact match “With over 40 years of information security experience, Hytec, a Civica company, is a trusted partner for organisations looking for expert, specialised cyber security protection.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
25	Kelltron Consulting Services	Exact match	Aylesbury, United KingdomHQ recorded Sep 21, 2026	11-50	7 contacts →
	Exact match “Kelltron Consulting Services is a globally recognized cybersecurity consulting firm with a strong presence in the United Kingdom, United States, and India.” Recorded in the RevenueBase company graph · Sep 21, 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 “manhattan cybersecurity firms”. 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 148 manhattan cybersecurity firms based in the United Kingdom

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Manhattan cybersecurity firms based in the United Kingdom at a glance

As of Sep 21, 2026

28.3%Verified-email coverage

19.7Average contacts per company

1-10Median size (employees)

41.9%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

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 148 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 the United Kingdom whose business descriptions match “manhattan cybersecurity firms” 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 825 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 September 21, 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.

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 “manhattan cybersecurity firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many manhattan cybersecurity firms are there based in the United Kingdom?

RevenueBase identified 148 company matches for manhattan cybersecurity firms associated with the United Kingdom as of September 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?

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

Which city has the most manhattan cybersecurity firms?

London leads with 62 company records, followed by Manchester (7) and Birmingham (3).

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 825 professional contacts with verified work emails tracked across these 148 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 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 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.