Company lists · Data refreshed September 2026

Top 25 Data security services based in the United Kingdom

Name: Data security services 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 403 companies tracked

RevenueBase identified 403 data security services headquartered in the United Kingdom as of September 2026 and tracks 3,889 professional contacts across them, including 1,116 with verified work emails. London is the largest hub.

This list covers data security services headquartered in the 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 21, 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 21, 2026 86% judged on-target in blind review

403Companies

3,889Contacts tracked

1,116Verified emails

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The 25 largest data security services based in the United Kingdom

Ranked by team size

Top 25 of 403 data security services based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to data security services: 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	Securityhq	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	501-1,000	502 contacts →
	Partial evidence “SecurityHQ, a global cybersecurity company pioneering Security Performance Engineering for stronger operational performance and resilience.” Source: RevenueBase Database · checked Sep 21, 2026
2	Cyberfort	Strong evidence	Thatcham, United KingdomHQ checked Sep 21, 2026	51-200	159 contacts →
	Strong evidence “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…” Source: RevenueBase Database · checked Sep 21, 2026
3	Bulletproof Cyber Security	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	123 contacts →
	Indirect evidence “Bulletproof is now part of WorkNest Secure.” Source: RevenueBase Database · checked Sep 21, 2026
4	Telesoft	Indirect evidence	Blandford, United KingdomHQ checked Sep 21, 2026	51-200	68 contacts →
	Indirect evidence “The organisations that run our world face relentless complexity and evolving threats.” Source: RevenueBase Database · checked Sep 21, 2026
5	Hexegic	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	52 contacts →
	Partial 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 21, 2026
6	Galaxkey	Partial evidence	St. Albans, United KingdomHQ checked Sep 21, 2026	51-200	40 contacts →
	Partial evidence “Advanced three-layer, identity based encryption ensures your data and communications stay protected, inside and outside your network.” Source: RevenueBase Database · checked Sep 21, 2026
7	Core To Cloud	Indirect evidence	Cirencester, United KingdomHQ checked Sep 21, 2026	11-50	39 contacts →
	Indirect evidence “We help organisations understand, optimise, and strengthen their cybersecurity.” Source: RevenueBase Database · checked Sep 21, 2026
8	Data Protection People	Strong evidence	Leeds, United KingdomHQ checked Sep 21, 2026	11-50	39 contacts →
	Strong evidence “Data Protection People are specialists in Data Protection and Information Security.” Source: RevenueBase Database · checked Sep 21, 2026
9	Secarma LTD	Indirect evidence	Manchester, United KingdomHQ checked Sep 21, 2026	11-50	36 contacts →
	Indirect evidence “Secarma exists to keep the world safe.” Source: RevenueBase Database · checked Sep 21, 2026
10	defense.com	Partial evidence	Stevenage, United KingdomHQ checked Sep 21, 2026	51-200	32 contacts →
	Partial evidence “Defense.com is transforming the way businesses manage cyber security by allowing them to easily identify, prioritise and remediate threats.” Source: RevenueBase Database · checked Sep 21, 2026
11	Intrinsic Security	Partial evidence	Peterborough, United KingdomHQ checked Sep 21, 2026	51-200	32 contacts →
	Partial evidence “Intrinsic Security is a UK-headquartered cybersecurity firm delivering 24/7 threat detection, incident response, and resilience across cloud, hybrid, OT, IoT, and identity…” Source: RevenueBase Database · checked Sep 21, 2026
12	Handd Business Solutions	Strong evidence	Reading, United KingdomHQ checked Sep 21, 2026	11-50	31 contacts →
	Strong evidence “HANDD Business Solutions delivers world-class data security and automation solutions through professional managed services to organisations worldwide.” Source: RevenueBase Database · checked Sep 21, 2026
13	Omnicyber Security	Partial evidence	Solihull, United KingdomHQ checked Sep 21, 2026	11-50	31 contacts →
	Partial evidence “SPECIALISTS IN IT SECURITY AND COMPLIANCE Our goal is to help customers define, develop and implement information security and compliance services, no matter what stage of the…” Source: RevenueBase Database · checked Sep 21, 2026
14	Citation Cyber	Partial evidence	Lancaster, United KingdomHQ checked Sep 21, 2026	11-50	30 contacts →
	Partial evidence “Cyber security can feel overwhelming.” Source: RevenueBase Database · checked Sep 21, 2026
15	Privitar	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	30 contacts →
	Partial evidence “Privitar empowers organizations to use their data safely and ethically.” Source: RevenueBase Database · checked Sep 21, 2026
16	Cyber Security Specialists	Partial evidence	Altrincham, United KingdomHQ checked Sep 21, 2026	11-50	26 contacts →
	Partial evidence “Based in Manchester UK, we are an independent Cyber Security Consultancy providing Security services across a wide range of markets, from multi-national Corporate Organisations…” Source: RevenueBase Database · checked Sep 21, 2026
17	Smartsafe Consulting And Technology	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	26 contacts →
	Indirect evidence “Our overarching aim is to safeguard your information so that you can focus on taking your business where you want it to go.” Source: RevenueBase Database · checked Sep 21, 2026
18	Encode	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	25 contacts →
	Partial evidence “Encode is now part of Obrela Security Industries collectively delivering cutting edge Cyber Security Services, empowering organizations to better protect against cyber threats.” Source: RevenueBase Database · checked Sep 21, 2026
19	I3secure LTD	Strong evidence	Bristol, United KingdomHQ checked Sep 21, 2026	11-50	24 contacts →
	Strong evidence “i3Secure is a cyber security and information assurance consultancy protecting the confidentiality, integrity and availability of data across defence, public and private sectors.” Source: RevenueBase Database · checked Sep 21, 2026
20	Nanjgel Solutions	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	24 contacts →
	Partial evidence “Nanjgel Solutions is focused on delivering the best IT security for businesses.” Source: RevenueBase Database · checked Sep 21, 2026
21	AMR Cybersecurity	Partial evidence	Cheltenham, United KingdomHQ checked Sep 21, 2026	11-50	23 contacts →
	Partial evidence “AMR CyberSecurity delivers next generation cyber security services to assist organisations across a wide variety of sectors in understanding potential threats and effectively…” Source: RevenueBase Database · checked Sep 21, 2026
22	Blackfoot Cybersecurity	Indirect evidence	Welwyn Garden City, United KingdomHQ checked Sep 21, 2026	11-50	23 contacts →
	Indirect evidence “For the past 17 years, we have been successfully empowering our clients to protect their business from cyber-threats and comply with industry standards and regulations.” Source: RevenueBase Database · checked Sep 21, 2026
23	Blue Cube Security LTD	Partial evidence	East Grinstead, United KingdomHQ checked Sep 21, 2026	11-50	22 contacts →
	Partial evidence “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.” Source: RevenueBase Database · checked Sep 21, 2026
24	Razorthorn Security	Strong evidence	Tunbridge Wells, United KingdomHQ checked Sep 21, 2026	11-50	19 contacts →
	Strong evidence “Razorthorn Security is a specialist cybersecurity consultancy founded in 2007, with nearly two decades of experience helping organisations protect their data, their systems and…” Source: RevenueBase Database · checked Sep 21, 2026
25	DPAS	Partial evidence	Exeter, United KingdomHQ checked Sep 21, 2026	11-50	19 contacts →
	Partial evidence “Is your organisation confident in its data protection compliance?” Source: RevenueBase Database · checked Sep 21, 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: data security services. 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 data security services.
Partial evidence: Its own public description names part of data security services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name data security services. 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 403 data security services based in the United Kingdom

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Data security services based in the United Kingdom at a glance

As of Sep 21, 2026

28.7%Verified-email coverage

9.7Average contacts per company

1-10Median size (employees)

35.2%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

261

11-50

115

51-200

201-500

501-1,000

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 403 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 data security services, 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 the United Kingdom whose own description of what they do matches “data security services”. 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 data security services), 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 data security services, and records with no verified work email. Companies headquartered outside United Kingdom 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, 1,116 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 21, 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.

Data security services by metro

Data security services in London142

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 data security services, 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 data security services are there based in the United Kingdom?

RevenueBase identified 403 data security services headquartered in the 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?

Securityhq, headquartered in Gb, tops this list with the largest team on record.

Which city has the most data security services?

London leads with 142 headquartered companies, followed by Manchester (16) and Birmingham (7).

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 1,116 verified decision-maker contacts tracked across these 403 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 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 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.