Company lists · Data refreshed September 2026

Top 23 Secure software development companies based in London, United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 6, 2026 477 companies tracked

RevenueBase identified 477 secure software development companies headquartered in London, United Kingdom as of September 2026 and tracks 5,101 professional contacts across them, including 1,119 with verified work emails. London is the largest hub.

This list covers secure software development 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, how directly it supports the match, and when it was last checked. Data refreshed September 6, 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 HQ checked on every row Match evidence on every row Refreshed Sep 6, 2026 86% judged on-target in blind review

477Companies

5,101Contacts tracked

1,119Verified emails

Explore all 477 companies → Free signup · no credit card · 500 free credits

The 23 largest secure software development companies based in London, United Kingdom

Ranked by team size

Top 23 of 477 secure software development companies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 6, 2026. Evidence rates how directly each company's own description names secure software development companies: 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.
#	Company	Headquarters	Employees	Contacts
1	Flat Rock TechnologyStrong evidence	London, United KingdomHQ checked Sep 6, 2026	201-500	231
	“Since 2008, Flat Rock Technology, a software engineering, SI, Cloud DevOps, Cyber Security, and Customer Experience (CX) company, has been at the forefront of providing innovative…” Source: company website · checked Sep 6, 2026
2	IntragenPartial evidence	London, United KingdomHQ checked Sep 6, 2026	201-500	190
	“Intragen is a cyber security business focused on managed Identity solutions and services.” Source: company website · checked Sep 6, 2026
3	Turnkey ConsultingPartial evidence	London, United KingdomHQ checked Sep 6, 2026	51-200	134
	“Turnkey Consulting brings together people, protection, and performance to help the world’s leading companies understand and optimize their risk and security landscape.” Source: company website · checked Sep 6, 2026
4	TrpglobalIndirect evidence	London, United KingdomHQ checked Sep 6, 2026	51-200	126
	“We are TRPGLOBAL, your strategic partner in helping you with the complexities of risk management.” Source: company website · checked Sep 6, 2026
5	ConoscoPartial evidence	London, United KingdomHQ checked Sep 6, 2026	51-200	105
	“Cybersecurity specialists providing technology and telecoms solutions that gives you the leadership, experience and resilience you need to build and secure the future of work.” Source: company website · checked Sep 6, 2026
6	Caretower An Integrity360 CompanyPartial evidence	London, United KingdomHQ checked Sep 6, 2026	201-500	97
	“As an independent IT security specialist, Caretower provide comprehensive solutions to individual problems, thus allowing our recommendations to be unbiased.” Source: company website · checked Sep 6, 2026
7	ITC SecurePartial evidence	London, United KingdomHQ checked Sep 6, 2026	51-200	87
	“ITC Secure is an advisory-led cyber security services company.” Source: company website · checked Sep 6, 2026
8	Wizard GroupIndirect evidence	London, United KingdomHQ checked Sep 6, 2026	51-200	61
	“The Wizard group consists of 4 companies all within the information technology and cybersecurity industry.” Source: company website · checked Sep 6, 2026
9	DainttaPartial evidence	London, United KingdomHQ checked Sep 6, 2026	51-200	60
	“We provide deep expertise with technical and business specialists to help clients secure and protect the UK.” Source: company website · checked Sep 6, 2026
10	Gemba AdvantageStrong evidence	London, United KingdomHQ checked Sep 6, 2026	51-200	59
	“Gemba Advantage make high-impact software that is secure, scalable and sustainable.” Source: company website · checked Sep 6, 2026
11	SecureflagIndirect evidence	London, United KingdomHQ checked Sep 6, 2026	51-200	57
	Source: company website · checked Sep 6, 2026
12	RiversafePartial evidence	London, United KingdomHQ checked Sep 6, 2026	11-50	57
	“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: company website · checked Sep 6, 2026
13	10qbitIndirect evidence	London, United KingdomHQ checked Sep 6, 2026	11-50	46
	“There are many Tech Solution companies out there.” Source: company website · checked Sep 6, 2026
14	Team Fusion LTDPartial evidence	London, United KingdomHQ checked Sep 6, 2026	11-50	34
	“Our elite teams offer bespoke, integrated security solutions that adapt and react to the evolving threat landscape.” Source: company website · checked Sep 6, 2026
15	Torrid Networks LimitedPartial evidence	London, United KingdomHQ checked Sep 6, 2026	51-200	32
	“Founded in 2006, Torrid Networks has been able to establish strong credentials in the area of cyber security products, research, consulting, managed services, education and staff…” Source: company website · checked Sep 6, 2026
16	Cyb3rPartial evidence	London, United KingdomHQ checked Sep 6, 2026	51-200	32
	“CYB3R Group, is a leading provider of comprehensive Cyber Security, IT and Communications Solutions.” Source: company website · checked Sep 6, 2026
17	EncodePartial evidence	London, United KingdomHQ checked Sep 6, 2026	51-200	25
	“Encode is now part of Obrela Security Industries collectively delivering cutting edge Cyber Security Services, empowering organizations to better protect against cyber threats.” Source: company website · checked Sep 6, 2026
18	Heptagon GroupPartial evidence	London, United KingdomHQ checked Sep 6, 2026	11-50	24
	“At Heptagon Group, we help you manage your organisation from anywhere, anytime, securely.” Source: company website · checked Sep 6, 2026
19	Formation TechIndirect evidence	London, United KingdomHQ checked Sep 6, 2026	11-50	22
	“Specialsing in cybersecurity, networks, voice and video, we're on a mission to transform workspaces and deliver exceptional outcomes for our clients.” Source: company website · checked Sep 6, 2026
20	Templar ExecutivesPartial evidence	London, United KingdomHQ checked Sep 6, 2026	51-200	21
	“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.” Source: company website · checked Sep 6, 2026
21	LMS SecurityPartial evidence	London, United KingdomHQ checked Sep 6, 2026	11-50	20
	“LMS Security are a fully Independent, privately owned, Internationally recognised and accredited Security Consultancy; owned and built by Electronic and Physical Security…” Source: company website · checked Sep 6, 2026
22	Olive JAR DigitalPartial evidence	London, United KingdomHQ checked Sep 6, 2026	11-50	20
	“Olive Jar Digital has extensive experience in building highly secure, resilient, highly available and scalable websites.” Source: company website · checked Sep 6, 2026
23	NGS Next Generation SecurityPartial evidence	London, United KingdomHQ checked Sep 6, 2026	11-50	20
	“Formed in 2018, NGS (UK) Ltd are independent, Next Generation Security trusted advisors, providing all-encompassing solutions from the perimeter to the endpoint.” Source: company website · checked Sep 6, 2026

Showing 23 of 477 secure software development companies based in London, United Kingdom

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Secure software development companies based in London, United Kingdom at a glance

As of Sep 6, 2026

1-10Median size (employees)

LondonLargest hub · 477 HQs

Contacts with mobile numbers

Sep 6, 2026Data refreshed

Companies by employee count

1-10

311

11-50

121

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured across the whole United Kingdom list rather than this city, so it is reported there. Company counts and contact totals on this page are exact for London, over 477 companies.

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 secure software development companies, 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 London, United Kingdom whose own description of what they do matches “secure software development companies”. 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 secure software development 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 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, 1,119 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 6, 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.

Secure software development companies by metro in the United Kingdom

Secure software development companies in London477
Secure software development companies in Manchester49
Secure software development companies in Birmingham26

Frequently asked

How many secure software development companies are there based in London, United Kingdom?

RevenueBase identified 477 secure software development companies headquartered in London, 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?

Flat Rock Technology, headquartered in London, tops this list with the largest team on record.

Which city has the most secure software development companies?

London leads with 477 headquartered companies, followed by Manchester (49) and Birmingham (26).

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 1,119 verified decision-maker contacts tracked across these 477 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 6, 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.