Company lists · Data refreshed September 2026
Top 25 Network security monitoring companies based in the United Kingdom
RevenueBase identified 290 network security monitoring companies headquartered in the United Kingdom as of September 2026 and tracks 4,072 professional contacts across them, including 1,189 with verified work emails and 285 with mobile numbers. London is the largest hub.
This list covers network security monitoring 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 25 largest network security monitoring companies based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 242 | ||||
“Obrela Security Industries is a global provider of cyber security services.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | 177 | ||||
“Whether you’re a business or an individual, digital threats to your precious data and assets can come in any form - external or internal.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | 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 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | 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. | |||||
| 5 | 95 | ||||
“SEP2 is an award-winning UK-based cyber security specialist service provider, powered by a dedicated team of experts available 24/7/365.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | 86 | ||||
“CyberGuard Technologies is the security division of Wavenet.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | CybersmartIndirect evidence | 84 | |||
“Cybersecurity should be simple.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | 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 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | 68 | ||||
“The organisations that run our world face relentless complexity and evolving threats.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | 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. | |||||
| 11 | 54 | ||||
“SNO is a specialist network operations and security partner, helping organisations design, secure, and manage the networks they rely on every day.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | 52 | ||||
“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: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | Adarma SecurityIndirect evidence | 51 | |||
“We are Adarma, independent leaders in detection and response services.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 14 | 45 | ||||
“Established in 2004 (acquired by Gamma in 2023), Satisnet, a Gamma company is a pedigree-proven cyber security services and solutions specialist with a fully UK-based 24x7x365 SOC.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | 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. | |||||
| 16 | 41 | ||||
“We are on a mission to simplify and scale cyber security by combining AI, automation, expert-led services, in a unified platform: giving every organisation, from MSPs to global…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | 39 | ||||
“We help organisations understand, optimise, and strengthen their cybersecurity.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 18 | 36 | ||||
“Secarma exists to keep the world safe.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 19 | Forward Security Services LimitedIndirect evidence | 36 | |||
“Based in Huddersfield, West Yorkshire.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | 34 | ||||
“We are your strategic cybersecurity partner – going beyond traditional models to deliver agile, expert-led protection tailored to the needs of regulated industries and critical…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 21 | CyberisPartial evidence | 34 | |||
“Cyberis are pioneers in customer-focussed information security.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 22 | 32 | ||||
“Defense.com is transforming the way businesses manage cyber security by allowing them to easily identify, prioritise and remediate threats.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 23 | 32 | ||||
“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: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 24 | 31 | ||||
“At Acumen, our purpose is clear: we protect modern businesses from the complexities of cyber threats 24/7.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 25 | 29 | ||||
“Secure, Connect, Empower.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 290 network security monitoring companies based in the United Kingdom
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Network security monitoring 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 monitoring 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 monitoring 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 monitoring 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, 1,189 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 monitoring companies by metro
- Network security monitoring companies in London111
Frequently asked
How many network security monitoring companies are there based in the United Kingdom?
RevenueBase identified 290 network security monitoring 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?
Obrela, headquartered in London, tops this list with the largest team on record.
Which city has the most network security monitoring companies?
London leads with 111 headquartered companies, followed by Manchester (9) 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 1,189 verified decision-maker contacts tracked across these 290 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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