Company lists · Data refreshed September 2026

Top 25 Security consulting firms based in the United Kingdom

RevenueBase identified 1,528 security consulting firms headquartered in the United Kingdom as of September 2026 and tracks 18,195 professional contacts across them, including 4,579 with verified work emails and 1,150 with mobile numbers. London is the largest hub.

This list covers security consulting 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.

How to read this list HQ checked on every row Match evidence on every row Refreshed Sep 6, 2026 86% judged on-target in blind review
1,528Companies
18,195Contacts tracked
4,579Verified emails
1,150Mobile numbers
Explore all 1,528 companies → Free signup · no credit card · 500 free credits

The 25 largest security consulting firms based in the United Kingdom

Ranked by team size
Top 25 of 1,528 security consulting firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 6, 2026. Evidence rates how directly each company's own description names security consulting firms: 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
Icts UK & IrelandPartial evidence
London, United KingdomHQ checked Sep 6, 20261,001-5,000597

“Part of ICTS Europe Group, ICTS UK & Ireland is a professional services firm which has been specialised in security risk for the past 39+ years.”

Source: company website · checked Sep 6, 2026
2
SecurityhqPartial evidence
London, United KingdomHQ checked Sep 6, 2026501-1,000502

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

Source: company website · checked Sep 6, 2026
3
Lodge SecurityPartial evidence
Cirencester, United KingdomHQ checked Sep 6, 20261,001-5,000422

“Unlike traditional security providers, we're redefining what protection means in today's world.”

Source: company website · checked Sep 6, 2026
4London, United KingdomHQ checked Sep 6, 20265,001-10,000358

“ASEL design, develop and deliver fully bespoke and integrated security solutions, seamlessly bringing together people, technology and processes to achieve results-driven outcomes.”

Source: company website · checked Sep 6, 2026
5
XalientPartial evidence
Leeds, United KingdomHQ checked Sep 6, 2026201-500260

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

Source: company website · checked Sep 6, 2026
6
ObrelaPartial evidence
London, United KingdomHQ checked Sep 6, 2026201-500242

“Obrela Security Industries is a global provider of cyber security services.”

Source: company website · checked Sep 6, 2026
7Woking, United KingdomHQ checked Sep 6, 2026201-500205

“Pilgrims are a global security, risk management and service support company that identifies and manages risks for clients across all sectors, including oil & gas, telecoms…”

Source: company website · checked Sep 6, 2026
8Romford, United KingdomHQ checked Sep 6, 2026201-500200

“OpenView Security Solutions is the UK’S largest privately owned independent security company and provides unique, innovative and technologically excellent solutions to meet…”

Source: company website · checked Sep 6, 2026
9Leeds, United KingdomHQ checked Sep 6, 20261,001-5,000180

“Established in 1978, Bridgegate Security is proud to be one of the UK’s largest independent security contractors.”

Source: company website · checked Sep 6, 2026
10
SapphireIndirect evidence
Newcastle Upon Tyne, United KingdomHQ checked Sep 6, 202651-200168

“Sapphire delivers comprehensive cyber solutions tailored to your needs, spanning across consultancy, managed services, IT/OT and beyond.”

Source: company website · checked Sep 6, 2026
11
CyberfortPartial evidence
Thatcham, United KingdomHQ checked Sep 6, 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 6, 2026
12
LOGIQPartial evidence
Bradley Stoke, United KingdomHQ checked Sep 6, 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 6, 2026
13
Turnkey ConsultingStrong evidence
London, United KingdomHQ checked Sep 6, 202651-200134

“Turnkey Consulting brings together people, protection, and performance to help the world’s leading companies understand and optimize their risk and security landscape.”

Source: company website · checked Sep 6, 2026
14
TrpglobalIndirect evidence
London, United KingdomHQ checked Sep 6, 202651-200126

“We are TRPGLOBAL, your strategic partner in helping you with the complexities of risk management.”

Source: company website · checked Sep 6, 2026
15
Khipu NetworksPartial evidence
Fleet, United KingdomHQ checked Sep 6, 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 6, 2026
16
Bulletproof Cyber SecurityIndirect evidence
London, United KingdomHQ checked Sep 6, 202651-200123

“Bulletproof is now part of WorkNest Secure.”

Source: company website · checked Sep 6, 2026
17Watford, United KingdomHQ checked Sep 6, 202651-200116

“TSP has a reputation for providing enterprise security solutions, as well as excellent system integration standards and exceptional aftercare support, since its founding in 1988.”

Source: company website · checked Sep 6, 2026
18
Redline Assured SecurityPartial evidence
Doncaster, United KingdomHQ checked Sep 6, 202651-20099

“At Redline, we deliver a wide range of security solutions spanning training, quality assurance, auditing and risk management software.”

Source: company website · checked Sep 6, 2026
19London, United KingdomHQ checked Sep 6, 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 6, 2026
20
CognisysPartial evidence
Leeds, United KingdomHQ checked Sep 6, 202651-20090

“Solutions | Testing | Knowledge Helping You Protect Your Business From Cyber Attackers Your security and compliance partner, delivering trust worldwide Cognisys are your trusted…”

Source: company website · checked Sep 6, 2026
21
ITC SecurePartial evidence
London, United KingdomHQ checked Sep 6, 202651-20087

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

Source: company website · checked Sep 6, 2026
22Whiteley, United KingdomHQ checked Sep 6, 2026501-1,00087

“Croma Security Solutions Group (CSSG) began in 1970 as a family-run business in Shirley, Southampton, known as County Locksmiths.”

Source: company website · checked Sep 6, 2026
23
Amethyst Risk ManagementIndirect evidence
Basingstoke, United KingdomHQ checked Sep 6, 202611-5085

“Amethyst Risk Management is a leading cybersecurity consultancy supplying expert services and support to the UK Government, Defence, Operators of Essential Services, and the…”

Source: company website · checked Sep 6, 2026
24
ARK Workplace RiskIndirect evidence
London, United KingdomHQ checked Sep 6, 202651-20082

“Ark Workplace Risk is the trusted partner for organisations seeking to take control of their risk, compliance, and safety.”

Source: company website · checked Sep 6, 2026
25
ForegenixPartial evidence
Swindon, United KingdomHQ checked Sep 6, 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 6, 2026

Showing 25 of 1,528 security consulting firms based in the United Kingdom

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Security consulting firms based in the United Kingdom at a glance

As of Sep 6, 2026
1-10Median size (employees)
LondonLargest hub · 559 HQs
1,150Contacts with mobile numbers
Sep 6, 2026Data refreshed

Companies by employee count

1-10
934
11-50
397
51-200
136
201-500
36
501-1,000
11
1,001-5,000
5
5,001-10,000
2
10001+
2

Verified emails by last verification

0–30
4,245
31–60
309
61–90
4
90–180
1
180+
20

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 consulting 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 consulting 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 consulting 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, 4,579 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.

Frequently asked

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

RevenueBase identified 1,528 security consulting 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?

Icts UK & Ireland, headquartered in United Kingdom, tops this list with the largest team on record.

Which city has the most security consulting firms?

London leads with 559 headquartered companies, followed by Manchester (38) and Birmingham (30).

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 4,579 verified decision-maker contacts tracked across these 1,528 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.