Company lists · Data refreshed September 2026

Top 25 Cybersecurity incident response based in London, United Kingdom

Name: Cybersecurity incident response based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 10, 2026 164 companies tracked

RevenueBase identified 164 company matches for cybersecurity incident response associated with London, United Kingdom as of September 2026 and tracks 3,114 professional contacts across them, including 744 with verified work emails and 254 with mobile numbers. Across the United Kingdom, London is the largest hub for this category.

This list covers company matches for cybersecurity incident response associated with London, 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 September 10, 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 Sep 10, 2026 How this list was built

164Companies

3,114Contacts tracked

744Verified emails

254Mobile numbers

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The 25 largest cybersecurity incident response based in London, United Kingdom

Ranked by team size

Top 25 of 164 company matches for cybersecurity incident response based in London, United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 10, 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.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	S-Rm	Exact match	London, United KingdomHQ recorded Sep 10, 2026	201-500	351 contacts →
	Exact match “S-RM is a global intelligence and cyber security consultancy.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
2	Obrela	Exact match	London, United KingdomHQ recorded Sep 10, 2026	201-500	242 contacts →
	Exact match “Obrela Security Industries is a global provider of cyber security services.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
3	Deepcytes Cyber Labs UK	Exact match	London, United KingdomHQ recorded Sep 10, 2026	51-200	177 contacts →
	Exact match “Whether you’re a business or an individual, digital threats to your precious data and assets can come in any form - external or internal.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
4	ITC Secure	Exact match	London, United KingdomHQ recorded Sep 10, 2026	51-200	87 contacts →
	Exact match “ITC Secure is an advisory-led cyber security services company.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
5	White HAT An Epam Company	Exact match	London, United KingdomHQ recorded Sep 10, 2026	51-200	77 contacts →
	Exact match “White Hat, part of the EPAM group, is an award-winning cyber intelligence and offensive security company that leverages an attacker’s perspective to shape innovative, proactive…” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
6	Hexegic	Exact match	London, United KingdomHQ recorded Sep 10, 2026	51-200	52 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
7	Istari	Exact match	London, United KingdomHQ recorded Sep 10, 2026	51-200	52 contacts →
	Exact match “ISTARI is a global cybersecurity firm, established by Temasek in 2020, with a unique model for helping clients build cyber resilience.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
8	Redscan, A Kroll Business	Exact match	London, United KingdomHQ recorded Sep 10, 2026	51-200	51 contacts →
	Exact match “Redscan is an award-winning provider of managed security services, specialising in Managed Detection and Response, Penetration Testing and Red Teaming.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
9	Cyber Rescue Alliance	Exact match	London, United KingdomHQ recorded Sep 10, 2026	1-10	29 contacts →
	Exact match “Cyber Rescue is a leading specialist in helping Boardroom Executives to measure, monitor and mitigate potential harm from cyber-attacks.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
10	J2 Mssp	Exact match	London, United KingdomHQ recorded Sep 10, 2026	11-50	29 contacts →
	Exact match “Cyber security is the modern business' greatest risk.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
11	Templar Executives	Exact match	London, United KingdomHQ recorded Sep 10, 2026	51-200	21 contacts →
	Exact match “Templar Executives is an award winning, international Cyber Security advisory services and solutions company operating at the highest levels across the public and private sectors.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
12	Storm Guidance	Exact match	London, United KingdomHQ recorded Sep 10, 2026	11-50	20 contacts →
	Exact match “STORM Guidance is an independent, global cyber risk and cyber incident advisory firm.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
13	Secure Purple	Exact match	London, United KingdomHQ recorded Sep 10, 2026	11-50	20 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
14	Sinevis	Exact match	London, United KingdomHQ recorded Sep 10, 2026	11-50	17 contacts →
	Exact match “We are a leading cybersecurity services organization with more than a decade of proven expertise in consulting, solution implementation and managed services.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
15	Barefoot Cyber	Exact match	London, United KingdomHQ recorded Sep 10, 2026	11-50	16 contacts →
	Exact match “Barefoot Cyber is the strategic partner for senior leaders who recognize that a cybersecurity attack is not just a technical failure, but a direct threat to their revenue…” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
16	Cyber Management Alliance Limited	Exact match	London, United KingdomHQ recorded Sep 10, 2026	11-50	16 contacts →
	Exact match “Founded in 2015 and headquartered in London UK, Cyber Management Alliance Ltd.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
17	Datasixth Consulting	Exact match	London, United KingdomHQ recorded Sep 10, 2026	51-200	15 contacts →
	Exact match “Who We Are DataSixth delivers Cybersecurity Intelligence.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
18	Netrascale	Exact match	London, United KingdomHQ recorded Sep 10, 2026	11-50	15 contacts →
	Exact match “At NetraScale, we help businesses navigate the ever-evolving cybersecurity landscape with confidence.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
19	Crossword Cybersecurity PLC	Exact match	London, United KingdomHQ recorded Sep 10, 2026	51-200	14 contacts →
	Exact match “Our goal is to help you reduce cybersecurity risk within your organisation, without adding complexity.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
20	Socguardians LTD	Exact match	London, United KingdomHQ recorded Sep 10, 2026	11-50	13 contacts →
	Exact match “Our mission at SOCGuardians is to empower organizations to operate confidently in a digital world by providing cutting-edge cybersecurity services.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
21	Asceris	Exact match	London, United KingdomHQ recorded Sep 10, 2026	11-50	11 contacts →
	Exact match “From our diverse backgrounds in cyber incident response, forensic investigations, automation, data science and cyber insurance, we have a unique perspective on how to improve…” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
22	Crmg Cyber Risk Management Group	Exact match	London, United KingdomHQ recorded Sep 10, 2026	11-50	11 contacts →
	Exact match “Cyber Risk Management Group is a leading provider of cyber security and information risk services.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
23	Disclosure Cybersecurity	Exact match	London, United KingdomHQ recorded Sep 10, 2026	11-50	11 contacts →
	Exact match “Disclosure Cybersecurity Ltd is a specialist cyber security company, formed by professionals with extensive experience and wide exposure in the cyber security market.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
24	First Response	Exact match	London, United KingdomHQ recorded Sep 10, 2026	11-50	11 contacts →
	Exact match “First Response is a London based specialist cybersecurity, cyber incident response and digital investigation company that helps organisations navigate the complex issues…” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
25	Secureteam LTD	Exact match	London, United KingdomHQ recorded Sep 10, 2026	11-50	10 contacts →
	Exact match “SecureTeam are a UK-based information security practice, specialising in all areas of cybersecurity.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “cybersecurity incident response”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 164 cybersecurity incident response based in London, United Kingdom

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Cybersecurity incident response based in London, United Kingdom at a glance

As of Sep 10, 2026

23.9%Verified-email coverage

8.2%Mobile-number coverage

19.0Average contacts per company

1-10Median size (employees)

Sep 10, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

10001+

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 12.0d

6900–30

5331–60

061–90

090–180

1180+

Company record updated

Median 73.0d

00–30

1,12931–60

1,44161–90

35790–180

187180+

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 London, United Kingdom whose business descriptions match “cybersecurity incident response” 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 744 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 September 10, 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.

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 “cybersecurity incident response”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many cybersecurity incident response are there based in London, United Kingdom?

RevenueBase identified 164 company matches for cybersecurity incident response associated with London, United Kingdom as of September 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?

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

Which city in the United Kingdom has the most cybersecurity incident response?

London leads the United Kingdom with 165 company records, followed by Manchester (18) and Birmingham (7).

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 744 professional contacts with verified work emails tracked across these 164 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 September 10, 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.