Company lists · Data refreshed September 2026
Top 21 Network security software companies based in the United Kingdom
RevenueBase identified 78 network security software companies headquartered in the United Kingdom as of September 2026 and tracks 788 professional contacts across them, including 298 with verified work emails and 56 with mobile numbers. London is the largest hub.
This list covers network security software companies 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 5, 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 21 largest network security software companies based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 125 | ||||
“KHIPU Networks is an award winning international Cyber Security Company delivering a wide range of network, wireless and security solutions, technologies and services across…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | 68 | ||||
“With a heritage of creating National Cyber Security Centre certified products, Becrypt, a Leonardo company, is a trusted provider of endpoint cybersecurity software solutions.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | 66 | ||||
“We help businesses and individuals stay protected in an increasingly complex digital world.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | Talk Straight GroupStrong evidence | 62 | |||
“Talk Straight has been looking after the communications and network security for thousands of public and private sector organisations since 2007.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | 60 | ||||
“Garrison is a London-based cybersecurity company founded in 2014 by David Garfield (CEO) and Henry Harrison (Chief Scientist).” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | 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 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | 23 | ||||
“4Secure is a trusted provider of software defined, cross-network/cross-domain cybersecurity solutions for commercial, government and defence.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | 15 | ||||
“Founded in 2006, Tranchulas is a multinational cyber security company having its offices in London, San Francisco, Budapest and Islamabad.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | 13 | ||||
“Assuria provides trusted cyber security software solutions and managed security services that power Security Operations Centres, IT Protective Monitoring services and IT Assurance…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | 10 | ||||
“PC POWER INTERNATIONAL LTD is a computer & network security company based in the City, London, United Kingdom.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | Netaccess LTDIndirect evidence | 8 | |||
“Design Philosophy The netaccess core design philosophy has always been to develop systems that support customer processes, ensure our products work for the user and reduce, as far…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | 7 | ||||
“Rebasoft is a UK based Software and Services company, founded in 2009 and produces software solutions for the Cyber Security market space.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | 7 | ||||
“DVS Develop, produce and distribute information security solutions that protect our customers from data loss.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 14 | 5 | ||||
“With a belief that the security of IT systems and networks is of primary importance to any business, Atomos Networks was created to deliver world class networks and network…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | 4 | ||||
“Ultra Horizon Ltd is a cyber security company comprised of computer scientists who design bespoke security solutions for the maritime and defence sector.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | 4 | ||||
“We are a leading cybersecurity company dedicated to protecting your digital assets and ensuring the utmost security for your organization.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | WinfrasoftStrong evidence | 3 | |||
“Founded in 2005 by Steven Hope and Phillip Nicklos, Winfrasoft is an independent software vendor building commercially supported infrastructure security and authentication tools…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 18 | 2 | ||||
“Network Secuirty” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 19 | 2 | ||||
“Essential Security is a unique company in that we offer a specialised and confidential service meeting your bespoke technological and communications requirements.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | KeychestIndirect evidence | 1 | |||
“We know encryption control can be made simple and KeyChest goes a long way- All information in one place - Set up and forget for low overhead - Simple and easy to install agents…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 21 | 1 | ||||
“Specialists in technical cybersecurity testing, penetration testing, Cyber Essentials & auditing.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
Showing 21 of 78 network security software companies based in the United Kingdom
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Network security software companies based in the United Kingdom at a glance
As of Sep 5, 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 network security software companies, 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 “network security software companies”. 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 network security software companies, 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, 298 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 5, 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.
Network security software companies by metro
- Network security software companies in London26
Frequently asked
How many network security software companies are there based in the United Kingdom?
RevenueBase identified 78 network security software companies 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?
Khipu Networks, headquartered in Fleet, tops this list with the largest team on record.
Which city has the most network security software companies?
London leads with 26 headquartered companies, followed by Northampton (3) and Bournemouth (2).
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 298 verified decision-maker contacts tracked across these 78 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 5, 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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