Company lists · Data refreshed September 2026

Top 25 Network security consulting companies based in the United Kingdom

RevenueBase identified 838 network security consulting companies headquartered in the United Kingdom as of September 2026 and tracks 7,675 professional contacts across them, including 2,926 with verified work emails and 521 with mobile numbers. London is the largest hub.

This list covers network security consulting 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.

How to read this list HQ checked on every row Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review
838Companies
7,675Contacts tracked
2,926Verified emails
521Mobile numbers
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The 25 largest network security consulting companies based in the United Kingdom

Ranked by team size
Top 25 of 838 network security consulting companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names network security consulting companies: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#CompanyHeadquartersEmployeesContacts
1
SecurityhqPartial evidence
London, United KingdomHQ checked Sep 5, 2026501-1,000502

SecurityHQ, a global cybersecurity company pioneering Security Performance Engineering for stronger operational performance and resilience.”

Source: company website · checked Sep 5, 2026
2
BridewellPartial evidence
Reading, United KingdomHQ checked Sep 5, 2026201-500303

“Bridewell is the trusted cyber security partner for organisations operating within Critical National Infrastructure (CNI), as well as companies who want the highest standard of…”

Source: company website · checked Sep 5, 2026
3
XalientStrong evidence
Leeds, United KingdomHQ checked Sep 5, 2026201-500260

“We are a global boutique, specializing exclusively in the convergence of identity-driven security and networking.”

Source: company website · checked Sep 5, 2026
4
CyberfortPartial evidence
Thatcham, United KingdomHQ checked Sep 5, 202651-200159

“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, 2026
5
PerformantaIndirect evidence
Maidenhead, United KingdomHQ checked Sep 5, 202651-200156

“Performanta is a global cybersecurity and data risk management company dedicated to protecting people where data matters most.”

Source: company website · checked Sep 5, 2026
6
LOGIQPartial evidence
Bradley Stoke, United KingdomHQ checked Sep 5, 2026201-500143

“Logiq is a UK-based cyber security consultancy and secure managed services provider supporting defence, government, and critical national infrastructure (CNI) organisations where…”

Source: company website · checked Sep 5, 2026
7
Khipu NetworksStrong evidence
Fleet, United KingdomHQ checked Sep 5, 202651-200125

“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, 2026
8
ConoscoIndirect evidence
London, United KingdomHQ checked Sep 5, 202651-200105

“Cybersecurity specialists providing technology and telecoms solutions that gives you the leadership, experience and resilience you need to build and secure the future of work.”

Source: company website · checked Sep 5, 2026
9London, United KingdomHQ checked Sep 5, 2026201-50097

“As an independent IT security specialist, Caretower provide comprehensive solutions to individual problems, thus allowing our recommendations to be unbiased.”

Source: company website · checked Sep 5, 2026
10
ITC SecurePartial evidence
London, United KingdomHQ checked Sep 5, 202651-20087

“ITC Secure is an advisory-led cyber security services company.”

Source: company website · checked Sep 5, 2026
11
ForegenixPartial evidence
Swindon, United KingdomHQ checked Sep 5, 202651-20080

“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, 2026
12
Reliance CyberIndirect evidence
Waterloo, United KingdomHQ checked Sep 5, 202651-20080

“At Reliance Cyber, we believe in truly partnering with our customers.”

Source: company website · checked Sep 5, 2026
13High Wycombe, United KingdomHQ checked Sep 5, 202651-20074

“Saepio increase awareness, reduce risk and improve security in a continually evolving threat landscape.”

Source: company website · checked Sep 5, 2026
14
Dionach By NomiosPartial evidence
Oxford, United KingdomHQ checked Sep 5, 202651-20073

“Dionach by Nomios has over 25 years of expertise in information security, supporting organisations in building resilience against ever‑evolving cyber threats.”

Source: company website · checked Sep 5, 2026
15
Sytel ReplyStrong evidence
London, United KingdomHQ checked Sep 5, 202611-5068

“Sytel Reply is the Reply Company focused on Networks and Security.”

Source: company website · checked Sep 5, 2026
16
Talk Straight GroupStrong evidence
Ilkley, United KingdomHQ checked Sep 5, 202611-5062

“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, 2026
17
Cyro CyberPartial evidence
London, United KingdomHQ checked Sep 5, 202651-20062

“Cyro Cyber are your cyber security Guardians.”

Source: company website · checked Sep 5, 2026
18
MDSECPartial evidence
Macclesfield, United KingdomHQ checked Sep 5, 202611-5061

“MDSec are a UK based consultancy with a passion for information security.”

Source: company website · checked Sep 5, 2026
19
DainttaIndirect evidence
London, United KingdomHQ checked Sep 5, 202651-20060

“We provide deep expertise with technical and business specialists to help clients secure and protect the UK.”

Source: company website · checked Sep 5, 2026
20
CyberlabPartial evidence
Alderley Edge, United KingdomHQ checked Sep 5, 202651-20057

“CyberLab is the UK-leading cyber security consultancy and managed services provider, trusted by over 1,200 enterprise businesses, government departments, and household names to…”

Source: company website · checked Sep 5, 2026
21Oswestry, United KingdomHQ checked Sep 5, 202651-20054

“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, 2026
22
Adarma SecurityIndirect evidence
Edinburgh, United KingdomHQ checked Sep 5, 2026201-50051

“We are Adarma, independent leaders in detection and response services.”

Source: company website · checked Sep 5, 2026
23
Satisnet, A Gamma CompanyPartial evidence
Luton, United KingdomHQ checked Sep 5, 202651-20045

“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, 2026
24
CornerstoneStrong evidence
London, United KingdomHQ checked Sep 5, 202651-20044

“CornerStone is an award winning, independent, security and digital building consulting firm with headquarters in the UK.”

Source: company website · checked Sep 5, 2026
25
Coretech SecurityPartial evidence
Cheltenham, United KingdomHQ checked Sep 5, 202651-20042

“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, 2026

Showing 25 of 838 network security consulting companies based in the United Kingdom

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Network security consulting companies based in the United Kingdom at a glance

As of Sep 5, 2026
1-10Median size (employees)
LondonLargest hub · 295 HQs
521Contacts with mobile numbers
Sep 5, 2026Data refreshed

Companies by employee count

1-10
551
11-50
218
51-200
49
201-500
16
501-1,000
3

Verified emails by last verification

0–30
2,722
31–60
184
61–90
0
90–180
1
180+
19

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 consulting 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 consulting 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 consulting 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, 2,926 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 consulting companies by metro

  • Network security consulting companies in London295
  • Network security consulting companies in Manchester30

Frequently asked

How many network security consulting companies are there based in the United Kingdom?

RevenueBase identified 838 network security consulting 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?

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

Which city has the most network security consulting companies?

London leads with 295 headquartered companies, followed by Manchester (30) and Birmingham (18).

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 2,926 verified decision-maker contacts tracked across these 838 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.