Company lists · Data refreshed September 2026
Top 25 Security research firms based in the United Kingdom
RevenueBase identified 470 security research firms headquartered in the United Kingdom as of September 2026 and tracks 4,582 professional contacts across them, including 1,360 with verified work emails and 332 with mobile numbers. London is the largest hub.
This list covers security research firms 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, how directly it supports the match, and when it was last checked. Data refreshed September 6, 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.
The 25 largest security research firms based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 502 | ||||
“SecurityHQ, a global cybersecurity company pioneering Security Performance Engineering for stronger operational performance and resilience.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 2 | 159 | ||||
“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: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 3 | 80 | ||||
“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…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 4 | 80 | ||||
“At Reliance Cyber, we believe in truly partnering with our customers.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 5 | White HAT An Epam CompanyPartial evidence | 77 | |||
“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…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 6 | 65 | ||||
“We’re here to provide world-leading vulnerability research and capabilities!” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 7 | 64 | ||||
“YOU DESERVE TO BE HACKED®.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 8 | 61 | ||||
“MDSec are a UK based consultancy with a passion for information security.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 9 | 51 | ||||
“EMSEC is an innovative research company founded in the United Kingdom with offices across India with an intention to provide services and products related to security research…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 10 | Purecyber LimitedPartial evidence | 49 | |||
“PureCyber is an award-winning, expert Cyber Security Consultancy.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 11 | 42 | ||||
“CoreTech is a specialist cyber security company whose people are motivated by the desire to deliver exceptional capabilities coupled with a real sense of mission.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 12 | 39 | ||||
“Computer Network Defence Ltd are a UK based cyber security consultancy with an extremely broad spectrum of capability.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 13 | Secforce LTDPartial evidence | 39 | |||
“SECFORCE are vendor independent offensive security specialists providing effective business risk intelligence and strategic security consulting.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 14 | 38 | ||||
“Omerta - A Global Security Technology and Services Company.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 15 | 36 | ||||
“Secarma exists to keep the world safe.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 16 | 36 | ||||
“Adaptive Cyber Security JUMPSEC operates on a core principle: real attack insight drives stronger defence.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 17 | CyberisPartial evidence | 34 | |||
“Cyberis are pioneers in customer-focussed information security.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 18 | 33 | ||||
“NotSoSecure Training, part of Claranet Cyber Security.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 19 | 32 | ||||
“Founded in 2006, Torrid Networks has been able to establish strong credentials in the area of cyber security products, research, consulting, managed services, education and staff…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 20 | 29 | ||||
“Imagine a world where cyber threats are simply another challenge that you're fully equipped to handle.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 21 | 29 | ||||
“CYJAX is an award-winning technology company and provider of digital threat intelligence services to international corporations, law enforcement agencies and the public sector.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 22 | Horus Security Consultancy LimitedPartial evidence | 29 | |||
“Horus is a leading intelligence and security consultancy with a global, multilingual team of unrivalled experience, insight and operational expertise.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 23 | 27 | ||||
“ANSecurity is a specialist in securing networks and protecting data that helps some of the largest organisations in the UK and global brands to reduce risk and simplify…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 24 | 26 | ||||
“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: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 25 | 25 | ||||
“Encode is now part of Obrela Security Industries collectively delivering cutting edge Cyber Security Services, empowering organizations to better protect against cyber threats.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 470 security research firms based in the United Kingdom
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Security research firms based in the United Kingdom at a glance
As of Sep 6, 2026Companies by employee count
Verified emails by last verification
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 research firms, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, 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 “security research firms”. Matching reads each company's description, not its industry code or its name.
- What we exclude
- Companies whose own description does not clearly place them among security research firms, 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 an evidence 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, 1,360 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 6, 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 research firms by metro
- Security research firms in London195
Frequently asked
How many security research firms are there based in the United Kingdom?
RevenueBase identified 470 security research firms 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 security research firms?
London leads with 195 headquartered companies, followed by Manchester (19) and Birmingham (8).
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 1,360 verified decision-maker contacts tracked across these 470 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 6, 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.
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