Company lists · Data refreshed August 2026

Top 25 Api security companies based in London, United Kingdom

Name: Api security companies based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Aug 31, 2026 160 companies tracked

RevenueBase identified 160 api security companies headquartered in London, United Kingdom as of August 2026 and tracks 2,037 professional contacts across them, including 274 with verified work emails and 186 with mobile numbers. London is the largest hub.

This list covers api security companies headquartered in London, 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed August 31, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 Smart Search rating on every row Refreshed Aug 31, 2026 86% judged on-target in blind review

160Companies

2,037Contacts tracked

274Verified emails

186Mobile numbers

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The 25 largest api security companies based in London, United Kingdom

Ranked by team size

Top 25 of 160 api security companies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Aug 31, 2026. RevenueBase Smart Search rates how each company's information relates to api security companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Bulletproof Cyber Security	Indirect evidence	London, United Kingdom	51-200	118 contacts →
	Indirect evidence “Bulletproof is now part of WorkNest Secure.” Source: RevenueBase Database · checked Aug 31, 2026
2	Riversafe	Partial evidence	London, United Kingdom	11-50	55 contacts →
	Partial evidence “We deliver services in Cybersecurity, Application Security and DevOps and are trusted by some of the world’s leading brands to maximise the value of their security investments and…” Source: RevenueBase Database · checked Aug 31, 2026
3	Hexegic	Indirect evidence	London, United Kingdom	51-200	52 contacts →
	Indirect evidence “At Hexegic we are not just passionate about protecting data through our Cyber services we are passionate about helping companies release the potential of the data they hold…” Source: RevenueBase Database · checked Aug 31, 2026
4	Equixly	Indirect evidence	London, United Kingdom	11-50	28 contacts →
	Indirect evidence “Penetration testing, reimagined with AI.” Source: RevenueBase Database · checked Aug 31, 2026
5	Encode	Partial evidence	London, United Kingdom	51-200	25 contacts →
	Partial evidence “Encode is now part of Obrela Security Industries collectively delivering cutting edge Cyber Security Services, empowering organizations to better protect against cyber threats.” Source: RevenueBase Database · checked Aug 31, 2026
6	Redfox Cybersecurity	Indirect evidence	London, United Kingdom	11-50	24 contacts →
	Indirect evidence “Redfox Cybersecurity is a fast-growing cybersecurity consulting firm, spread across 4 countries.” Source: RevenueBase Database · checked Aug 31, 2026
7	Ssl247 A Sectigo Company	Partial evidence	London, United Kingdom	51-200	24 contacts →
	Partial evidence “SSL247 (A Sectigo Company) has nearly 20 years of security consulting experience operating in 18 different markets globally.” Source: RevenueBase Database · checked Aug 31, 2026
8	Toro Solutions	Indirect evidence	London, United Kingdom	11-50	23 contacts →
	Indirect evidence “Toro was founded on creating the UK's first Red Team penetration test - and then attacking hundreds of clients by hacking their systems, influencing / social engineering staff and…” Source: RevenueBase Database · checked Aug 31, 2026
9	Secure Purple	Partial evidence	London, United Kingdom	11-50	20 contacts →
	Partial evidence “Secure Purple is a leading cyber security and digital safety firm that provides innovative solutions and services to help organisations and individuals stay protected in the…” Source: RevenueBase Database · checked Aug 31, 2026
10	th4ts3cur1ty.company	Partial evidence	London, United Kingdom	11-50	19 contacts →
	Partial evidence “th4ts3cur1ty.company supplies cyber security services internationally.” Source: RevenueBase Database · checked Aug 31, 2026
11	CST Limited Computer Security Technology	Partial evidence	London, United Kingdom	11-50	17 contacts →
	Partial evidence “We are a London based specialist supplier of cyber defence solution and information security services.” Source: RevenueBase Database · checked Aug 31, 2026
12	Eh1-Infotech Cybersecurity	Indirect evidence	London, United Kingdom	11-50	15 contacts →
	Indirect evidence “is an ISO 9001:2015 and ISO/IEC 27001:2022 certified, DPIIT-recognized cybersecurity company delivering structured External Vulnerability Assessment & Penetration Testing (VAPT)…” Source: RevenueBase Database · checked Aug 31, 2026
13	Datasixth Consulting	Indirect evidence	London, United Kingdom	51-200	14 contacts →
	Indirect evidence “Who We Are DataSixth delivers Cybersecurity Intelligence.” Source: RevenueBase Database · checked Aug 31, 2026
14	Netrascale	Indirect evidence	London, United Kingdom	11-50	14 contacts →
	Indirect evidence “At NetraScale, we help businesses navigate the ever-evolving cybersecurity landscape with confidence.” Source: RevenueBase Database · checked Aug 31, 2026
15	Socguardians LTD	Indirect evidence	London, United Kingdom	11-50	12 contacts →
	Indirect evidence “Our mission at SOCGuardians is to empower organizations to operate confidently in a digital world by providing cutting-edge cybersecurity services.” Source: RevenueBase Database · checked Aug 31, 2026
16	Disclosure Cybersecurity	Partial evidence	London, United Kingdom	11-50	11 contacts →
	Partial evidence “Disclosure Cybersecurity Ltd is a specialist cyber security company, formed by professionals with extensive experience and wide exposure in the cyber security market.” Source: RevenueBase Database · checked Aug 31, 2026
17	Secureteam LTD	Partial evidence	London, United Kingdom	11-50	10 contacts →
	Partial evidence “SecureTeam are a UK-based information security practice, specialising in all areas of cybersecurity.” Source: RevenueBase Database · checked Aug 31, 2026
18	Certified Nerds Cyber Security Company	Partial evidence	London, United Kingdom	11-50	6 contacts →
	Partial evidence “Certified Nerds, holding registrations in Canada and the UK, stands as a leading provider of managed cyber security services.” Source: RevenueBase Database · checked Aug 31, 2026
19	Rexel Cybersecurity	Indirect evidence	London, United Kingdom	11-50	5 contacts →
	Indirect evidence “At Rexel Cyber we help businesses fight the constant threat of cyber attack and data breach.” Source: RevenueBase Database · checked Aug 31, 2026
20	Safetech Innovations Global Services UK US	Indirect evidence	London, United Kingdom	51-200	4 contacts →
	Indirect evidence “Safetech Innovations Global Services is a global MSSP providing comprehensive cybersecurity solutions to organisations across the globe, helping our customers stay protected…” Source: RevenueBase Database · checked Aug 31, 2026
21	River Oakfield	Partial evidence	London, United Kingdom	11-50	4 contacts →
	Partial evidence “River Oakfield is a global cyber security firm which provides tailored solutions to individuals, business leaders and enterprise clients.” Source: RevenueBase Database · checked Aug 31, 2026
22	Grove Group	Indirect evidence	London, United Kingdom	51-200	3 contacts →
	Indirect evidence “Grove unlocks business success by defending our customers with the most advanced cybersecurity solutions in the market place today.” Source: RevenueBase Database · checked Aug 31, 2026
23	Sense Defence AI	Partial evidence	London, United Kingdom	51-200	2 contacts →
	Partial evidence “Sense Defence is a leading web security company powered by advanced AI, offering a suite of cutting-edge tools including an AI-driven Web Application Firewall (WAF), bot detection…” Source: RevenueBase Database · checked Aug 31, 2026
24	Cansol Consulting	Partial evidence	London, United Kingdom	11-50	2 contacts →
	Partial evidence “Founded in 2017, Cansol is a Cyber Security company with office in London and Dubai.” Source: RevenueBase Database · checked Aug 31, 2026
25	Cybergate LTD	Partial evidence	London, United Kingdom	11-50	2 contacts →
	Partial evidence “Cybergate is a security consultancy and penetration testing company which provides a full range of security services across several aspects of technology.” Source: RevenueBase Database · checked Aug 31, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: api security companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names api security companies.
Partial evidence: Its own public description names part of api security companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name api security companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 160 api security companies based in London, United Kingdom

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Api security companies based in London, United Kingdom at a glance

As of Aug 31, 2026

13.5%Verified-email coverage

9.1%Mobile-number coverage

12.7Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · London

Aug 31, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

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 api security companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search 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 Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in London, United Kingdom whose own description of what they do matches “api security companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names api security companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among api security companies, and records with no verified work email. Companies headquartered outside London 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 its RevenueBase Smart Search 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, 274 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 August 31, 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.

Api security companies by metro in the United Kingdom

Api security companies in London160

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names api security companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many api security companies are there based in London, United Kingdom?

RevenueBase identified 160 api security companies headquartered in London, United Kingdom as of August 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?

Bulletproof Cyber Security, headquartered in London, tops this list with the largest team on record.

Which city has the most api security companies?

London leads with 160 headquartered companies, followed by Manchester (18) and Cheltenham (12).

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 274 verified decision-maker contacts tracked across these 160 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on August 31, 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 Smart Search, 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.