Company lists · Data refreshed November 2026

Top 25 Api security consultants based in the United Kingdom

RevenueBase identified 83 company matches for api security consultants associated with the United Kingdom as of November 2026 and tracks 1,373 professional contacts across them, including 173 with verified work emails. London is the largest hub.

This list covers company matches for api security consultants 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
83Companies
1,373Contacts tracked
173Verified emails
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The 25 largest api security consultants based in the United Kingdom

Ranked by team size
Top 25 of 83 company matches for api security consultants 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 matchMacclesfield, United KingdomHQ recorded Nov 5, 202611-5057 contacts →

Exact match

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

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
2Exact 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
3Exact matchAltrincham, United KingdomHQ recorded Nov 5, 202611-5029 contacts →

Exact match

“Based in Manchester UK, we are an independent Cyber Security Consultancy providing Security services across a wide range of markets, from multi-national Corporate Organisations…”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
4Exact 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
5Exact matchLondon, United KingdomHQ recorded Nov 5, 202611-5017 contacts →

Exact match

“Demand more from your AI & Data Security partner.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
6Exact 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
7Exact matchBath, United KingdomHQ recorded Nov 5, 202611-5014 contacts →

Exact match

“At Mobius Binary we care about your reputation and the loss that could result from violating your digital boundaries.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
8Exact matchLondon, United KingdomHQ recorded Nov 5, 202611-5011 contacts →

Exact match

“SecureTeam are a UK-based information security practice, specialising in all areas of cybersecurity.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
9Exact matchGaerwen, United KingdomHQ recorded Nov 5, 20261-108 contacts →

Exact match

“Your Trusted CREST Certified Penetration Testing Partner.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
10Exact matchManchester, United KingdomHQ recorded Nov 5, 20261-107 contacts →

Exact match

“RM Information Security are a specialist penetration testing and information security consultancy based in the north of England.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
11Exact matchCranfield, United KingdomHQ recorded Nov 5, 202611-507 contacts →

Exact match

“Secure Debug: Your Full-Spectrum Cybersecurity Guardian!”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
12Exact matchLondon, United KingdomHQ recorded Nov 5, 20261-106 contacts →

Exact match

“Appsecco Inc.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
13Exact matchLondon, United KingdomHQ recorded Nov 5, 20261-105 contacts →

Exact match

“Every engagement led by consultants with 10-20 years of offensive security experience.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
14Exact matchLondon, United KingdomHQ recorded Nov 5, 20261-105 contacts →

Exact match

“We specialise in helping organisations identify security concerns and quantify the risks you may have across your assets, using Penetration Testing, Threat Simulation and…”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
15Exact matchYork, United KingdomHQ recorded Nov 5, 20261-104 contacts →

Exact match

“Adversify is a CREST-accredited offensive security and penetration testing consultancy focused on giving organisations a more complete picture of their security.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
16Exact matchChatham, United KingdomHQ recorded Nov 5, 202611-504 contacts →

Exact match

“Intex IT is an Information Security Consultancy We provide Consultancy in the following areas: ISO 27001 –Information Security Management System (ISMS) ISO 27005 – Risk Management…”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
17Exact matchMaidstone, United KingdomHQ recorded Nov 5, 20261-104 contacts →

Exact match

“After spending over a decade working in the cyber security industry, I noticed that many organisations that once specialised in penetration testing were being bought out or had…”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
18Exact matchLondon, United KingdomHQ recorded Nov 5, 20261-103 contacts →

Exact match

“Illume are a UK-based cyber security specialist helping organisations identify risk, stop threats, and stay secure.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
19Exact matchWorcester, United KingdomHQ recorded Nov 5, 20261-103 contacts →

Exact match

“Sodium Cyber cyber security consultancy based in Worcestershire, UK and was founded in 2022.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
20Exact matchAylesbury, United KingdomHQ recorded Nov 5, 202611-503 contacts →

Exact match

“Kelltron Consulting Services is a globally recognized cybersecurity consulting firm with a strong presence in the United Kingdom, United States, and India.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
21Exact matchMalta, United KingdomHQ recorded Nov 5, 202611-503 contacts →

Exact match

“Cybergate is a security consultancy and penetration testing company which provides a full range of security services across several aspects of technology.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
22Exact matchManchester, United KingdomHQ recorded Nov 5, 20261-103 contacts →

Exact match

“Digital Interruption is a cyber security consultancy which provides penetration testing, vulnerability security scanning, security training and compliance services.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
23Exact matchLondon, United KingdomHQ recorded Nov 5, 20261-103 contacts →

Exact match

“At Securityium, we're dedicated to transforming the way you experience security testing for your business.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
24Exact matchLondon, United KingdomHQ recorded Nov 5, 20261-103 contacts →

Exact match

“Needsec Limited stands at the forefront of the cybersecurity landscape, offering top-tier penetration testing services tailored to the unique needs of our clients.”

Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
25Exact matchCambridge, United KingdomHQ recorded Nov 5, 202611-502 contacts →

Exact match

“We believe that effective cybersecurity is within the reach of every organisation.”

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

Showing 25 of 83 api security consultants based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 173 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Api security consultants based in the United Kingdom at a glance

As of Nov 5, 2026
12.6%Verified-email coverage
16.5Average contacts per company
1-10Median size (employees)
34.9%Largest-city concentration · London
Nov 5, 2026Page data refreshed

Companies by employee count

1-10
57
11-50
23
51-200
1
501-1,000
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 83 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 “api security consultants” 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 173 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.

Api security consultants 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 “api security consultants”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many api security consultants are there based in the United Kingdom?

RevenueBase identified 83 company matches for api security consultants 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?

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

Which city has the most api security consultants?

London leads with 29 company records, followed by Manchester (5) and Cheltenham (3).

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 173 professional contacts with verified work emails tracked across these 83 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.

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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.