Company lists · Data refreshed September 2026

Top 25 Cybersecurity marketing agencies based in the United Kingdom

RevenueBase identified 1,063 cybersecurity marketing agencies headquartered in the United Kingdom as of September 2026 and tracks 17,466 professional contacts across them, including 6,991 with verified work emails and 2,228 with mobile numbers. London is the largest hub.

This list covers cybersecurity marketing agencies 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 3, 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 Match evidence on every row Refreshed Sep 3, 2026 86% judged on-target in blind review
1,063Companies
17,466Contacts tracked
6,991Verified emails
2,228Mobile numbers
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The 25 largest cybersecurity marketing agencies based in the United Kingdom

Ranked by team size
Top 25 of 1,063 cybersecurity marketing agencies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 3, 2026. Evidence rates how directly each company's own description names cybersecurity marketing agencies: 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
SophosPartial evidence
Abingdon, United Kingdom5,001-10,0004,963

“Sophos is a cybersecurity leader defending organizations globally with an AI-driven platform and expert-led services.”

Source: company website · checked Sep 3, 2026
2
ZerofoxIndirect evidence
United Kingdom501-1,000894

“ZeroFox is the solution to discover, validate, and disrupt external cyber threats before they harm revenue or reputation.”

Source: company website · checked Sep 3, 2026
3
SISAPartial evidence
Leicester, United Kingdom201-500739

“SISA is a global forensics-driven cybersecurity solutions company, trusted by leading organizations for securing their businesses with robust preventive, detective, and corrective…”

Source: company website · checked Sep 3, 2026
4
EverfoxIndirect evidence
London, United Kingdom1,001-5,000635

“Everfox delivers trusted connectivity to protect the world's most critical environments, safeguarding the sensitive information behind decision advantage.”

Source: company website · checked Sep 3, 2026
5
WithsecurePartial evidence
London, United Kingdom501-1,000614

“WithSecure™ is Europe's cybersecurity partner of choice.”

Source: company website · checked Sep 3, 2026
6
BridewellIndirect evidence
Edinburgh, United Kingdom201-500304

“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 3, 2026
7
Quorum CyberIndirect evidence
Edinburgh, United Kingdom201-500292

“At Quorum Cyber, we're on a mission to help good people win.”

Source: company website · checked Sep 3, 2026
8
The Redesign GroupPartial evidence
London, United Kingdom201-500201

“The Redesign Group is a global technology and cybersecurity consulting firm leveraging design thinking, interdependent subject matter expertise, and emerging technology solutions…”

Source: company website · checked Sep 3, 2026
9
Exclusive Networks UKPartial evidence
Mansfield, United Kingdom201-500168

“Exclusive Networks is a global trusted cybersecurity specialist for digital infrastructure helping to drive the transition to a totally trusted digital future for all people and…”

Source: company website · checked Sep 3, 2026
10
CyberfortIndirect evidence
Thatcham, United Kingdom51-200160

“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 3, 2026
11
Cybersec ConsultingIndirect evidence
London, United Kingdom201-500141

“CyberSec Consulting, headquartered in the UAE and serving the iMETA market, is a distinguished professional Cyber Security and Consulting services company.”

Source: company website · checked Sep 3, 2026
12
Khipu NetworksIndirect evidence
Fleet, United Kingdom51-200129

“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 3, 2026
13
Friend MTSPartial evidence
Manchester, United Kingdom51-200118

“As the number one anti-piracy provider, Friend MTS is the trusted cybersecurity partner of the biggest brands in media, sports, and entertainment.”

Source: company website · checked Sep 3, 2026
14
Bulletproof Cyber SecurityIndirect evidence
London, United Kingdom51-200118

“Bulletproof is now part of WorkNest Secure.”

Source: company website · checked Sep 3, 2026
15
Foresite CybersecurityIndirect evidence
Farnborough, United Kingdom51-200100

“As the world becomes more connected, our lives and businesses are more vulnerable.”

Source: company website · checked Sep 3, 2026
16
ITC SecureIndirect evidence
London, United Kingdom51-20087

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

Source: company website · checked Sep 3, 2026
17
Wavenet CyberguardIndirect evidence
London, United Kingdom201-50086

“CyberGuard Technologies is the security division of Wavenet.”

Source: company website · checked Sep 3, 2026
18
CybersmartPartial evidence
London, United Kingdom51-20083

Cybersecurity should be simple.”

Source: company website · checked Sep 3, 2026
19
Reliance CyberIndirect evidence
Waterloo, United Kingdom51-20080

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

Source: company website · checked Sep 3, 2026
20
Saepio Information SecurityIndirect evidence
High Wycombe, United Kingdom51-20073

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

Source: company website · checked Sep 3, 2026
21
Stripe OLTIndirect evidence
Manchester, United Kingdom51-20068

“From our offices in London, Bristol, and Manchester, Stripe OLT delivers cutting-edge cyber security and IT services to support and protect organisations in an ever-changing…”

Source: company website · checked Sep 3, 2026
22
CSA CyberIndirect evidence
Gloucester, United Kingdom51-20068

“Modern cyber resilience demands more than isolated controls.”

Source: company website · checked Sep 3, 2026
23
Eset UKIndirect evidence
Bournemouth, United Kingdom51-20066

“We help businesses and individuals stay protected in an increasingly complex digital world.”

Source: company website · checked Sep 3, 2026
24
CovertswarmIndirect evidence
London, United Kingdom51-20065

“YOU DESERVE TO BE HACKED®.”

Source: company website · checked Sep 3, 2026
25
Cyro CyberIndirect evidence
London, United Kingdom51-20063

“Cyro Cyber are your cyber security Guardians.”

Source: company website · checked Sep 3, 2026

Showing 25 of 1,063 cybersecurity marketing agencies based in the United Kingdom

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Cybersecurity marketing agencies based in the United Kingdom at a glance

As of Sep 3, 2026
1-10Median size (employees)
LondonLargest hub · 422 HQs
2,228Contacts with mobile numbers
Sep 3, 2026Data refreshed

Companies by employee count

1-10
665
11-50
296
51-200
71
201-500
16
501-1,000
6
1,001-5,000
3
5,001-10,000
2

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 cybersecurity marketing agencies, 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 “cybersecurity marketing agencies”. 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 cybersecurity marketing agencies, 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, 6,991 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 3, 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.

Cybersecurity marketing agencies by metro

  • Cybersecurity marketing agencies in London422
  • Cybersecurity marketing agencies in Manchester46

Frequently asked

How many cybersecurity marketing agencies are there based in the United Kingdom?

RevenueBase identified 1,063 cybersecurity marketing agencies 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?

Sophos, headquartered in Abingdon, tops this list with the largest team on record.

Which city has the most cybersecurity marketing agencies?

London leads with 422 headquartered companies, followed by Manchester (46) and Cheltenham (19).

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 6,991 verified decision-maker contacts tracked across these 1,063 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 3, 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.