Company lists · Data refreshed November 2026

Top 25 IT audit services based in the United Kingdom

RevenueBase identified 239 company matches for IT audit services associated with the United Kingdom as of November 2026 and tracks 2,735 professional contacts across them, including 806 with verified work emails. London is the largest hub.

This list covers company matches for IT audit services associated with the United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed November 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 RevenueBase SmartSearch · Exact Recorded Nov 5, 2026 How this list was built
239Companies
2,735Contacts tracked
806Verified emails
Explore this list → Free signup · no credit card · 500 free credits

The 25 largest IT audit services based in the United Kingdom

Ranked by team size
Top 25 of 239 company matches for IT audit services based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 5, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#CompanyRevenueBase SmartSearchHeadquartersEmployeesContacts
1Exact matchLondon, United KingdomHQ recorded Nov 5, 2026n/a782 contacts →

Exact match

“Get a free, powerful security assessment with personalised recommendations, the same analysis that costs from IT Consultancies.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
2Exact matchFareham, United KingdomHQ recorded Nov 5, 202651-200129 contacts →

Exact match

“Relax.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
3Exact matchWaterloo, United KingdomHQ recorded Nov 5, 202651-20084 contacts →

Exact match

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

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
4Exact matchOxford, United KingdomHQ recorded Nov 5, 202651-20076 contacts →

Exact match

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

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
5Exact matchSouthampton, United KingdomHQ recorded Nov 5, 202651-20072 contacts →

Exact match

“Many organisations are dealing with multiple frameworks, overlapping tools, disconnected ownership, and increasing pressure from regulators, customers, and boards.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
6Exact matchManchester, United KingdomHQ recorded Nov 5, 202611-5042 contacts →

Exact match

“Secarma exists to keep the world safe.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
7Exact matchSolihull, United KingdomHQ recorded Nov 5, 202611-5035 contacts →

Exact match

“SPECIALISTS IN IT SECURITY AND COMPLIANCE Our goal is to help customers define, develop and implement information security and compliance services, no matter what stage of the…”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
8Exact matchEly, United KingdomHQ recorded Nov 5, 2026201-50032 contacts →

Exact match

“IT Governance is a leading global provider of IT governance, risk management, penetration testing and compliance solutions, with a special focus on cyber resilience, data…”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
9Exact matchBristol, United KingdomHQ recorded Nov 5, 202611-5031 contacts →

Exact match

“We help Defence, Government and highly regulated organisations solve complex cyber security and information assurance challenges, from Secure by Design and security architecture…”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
10Exact matchEly, United KingdomHQ recorded Nov 5, 202651-20031 contacts →

Exact match

“GRC International Group plc is the holding company for a group of companies providing a range of products and services to address the IT governance, risk management and compliance…”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
11Exact matchPortsmouth, United KingdomHQ recorded Nov 5, 202611-5029 contacts →

Exact match

“Imagine a world where cyber threats are simply another challenge that you're fully equipped to handle.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
12Exact matchDurham, United KingdomHQ recorded Nov 5, 202651-20029 contacts →

Exact match

“Providing internal audit, technology risk assurance and counter fraud services in the North of England.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
13Exact matchCheltenham, United KingdomHQ recorded Nov 5, 202611-5026 contacts →

Exact match

“AMR CyberSecurity delivers next generation cyber security services to assist organisations across a wide variety of sectors in understanding potential threats and effectively…”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
14Exact matchLeeds, United KingdomHQ recorded Nov 5, 202611-5023 contacts →

Exact match

“Halo I.S is not just another cybersecurity organization based in the UK; we're a testament to evolution and client-centric innovation.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
15Exact matchBasingstoke, United KingdomHQ recorded Nov 5, 202611-5022 contacts →

Exact match

“We help organisations achieve business-focused cybersecurity compliance across various industry and regulatory frameworks with successful stakeholder management, particularly in…”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
16Exact matchCheltenham, United KingdomHQ recorded Nov 5, 202651-20021 contacts →

Exact match

“IRM, part of the Capgemini Group, works to defend organisations against cyber threats.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
17Exact matchLondon, United KingdomHQ recorded Nov 5, 202611-5018 contacts →

Exact match

“Our aim is to help businesses prepare for security audits and maintain ongoing compliance efficiently and effectively.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
18Exact matchLondon, United KingdomHQ recorded Nov 5, 202611-5014 contacts →

Exact match

“Risk Crew is known for their vision, innovative thinking and facility to embrace change.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
19Exact matchTunbridge Wells, United KingdomHQ recorded Nov 5, 202611-5014 contacts →

Exact match

“Razorthorn Security is a specialist cybersecurity consultancy founded in 2007, with nearly two decades of experience helping organisations protect their data, their systems and…”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
20Exact matchLondon, United KingdomHQ recorded Nov 5, 20261-1014 contacts →

Exact match

“We help organisations keep their data safe, use technology responsibly, and stay on the right side of the law, without the jargon.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
21Exact matchSheffield, United KingdomHQ recorded Nov 5, 202611-5013 contacts →

Exact match

“Hawsons Data Protection & Cyber Security Limited (formerly Bruce & Butler Limited) are your partners in Data Protection & Cyber Security.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
22Exact matchNottingham, United KingdomHQ recorded Nov 5, 202611-5012 contacts →

Exact match

“When you work with us, you can expect a no-fuss, reliable audit.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
23Exact matchManchester, United KingdomHQ recorded Nov 5, 202611-5012 contacts →

Exact match

“Predatech is a cyber security consultancy delivering a range of services, including penetration testing (CREST accredited), vulnerability management, ISO 27001, and certifications…”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
24Exact matchSouthend-on-sea, United KingdomHQ recorded Nov 5, 202611-5012 contacts →

Exact match

“Cyber Trust | Your security team around your existing IT Cyber Trust is a UK‑based cyber security firm that works alongside your existing IT team or technology provider.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
25Exact matchPoole, United KingdomHQ recorded Nov 5, 202611-5011 contacts →

Exact match

“Corporate IT Systems (CITSL) helps the organisations society depends on most make trust provable.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase

Showing 25 of 239 IT audit services based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 806 tracked professional contacts with verified work emails. Direct dials are available where recorded.

Free signup · no credit card

View the full list →

IT audit services based in the United Kingdom at a glance

As of Nov 5, 2026
29.5%Verified-email coverage
11.4Average contacts per company
1-10Median size (employees)
32.6%Largest-city concentration · London
Nov 5, 2026Page data refreshed

Companies by employee count

1-10
160
11-50
57
51-200
13
201-500
3
501-1,000
3
5,001-10,000
1

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 239 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

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
Company records associated with the United Kingdom whose business descriptions match “IT audit services” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch
Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview
The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality
RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 806 professional contacts with verified work emails across the full matched dataset. 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 November 5, 2026. Lists refresh periodically as the graph is re-checked.
Record context
Company records and descriptions can change. Check the company's website for its current services and locations.

IT audit services by metro

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “IT audit services”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many IT audit services are there based in the United Kingdom?

RevenueBase identified 239 company matches for IT audit services associated with the United Kingdom as of November 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

COBRA tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most IT audit services?

London leads with 78 company records, followed by Manchester (8) and Birmingham (4).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 806 professional contacts with verified work emails tracked across these 239 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on November 5, 2026.

Ready to reach these companies? Verified emails and direct dials for all 239 IT audit services based in the United Kingdom. Start with a free account, no credit card.

Download this list →

Related lists

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.