Company lists · Data refreshed September 2026

Top 25 Defense technology software startups based in the United Kingdom

Name: Defense technology software startups based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 1, 2026 67 companies tracked

RevenueBase identified 67 defense technology software startups headquartered in the United Kingdom as of September 2026 and tracks 3,118 professional contacts across them, including 935 with verified work emails and 667 with mobile numbers. London is the largest hub.

This list covers defense technology software startups headquartered in the 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 September 1, 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 Sep 1, 2026 86% judged on-target in blind review

67Companies

3,118Contacts tracked

935Verified emails

667Mobile numbers

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The 25 largest defense technology software startups based in the United Kingdom

Ranked by team size

Top 25 of 67 defense technology software startups based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 1, 2026. RevenueBase Smart Search rates how each company's information relates to defense technology software startups: 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	ROKE	Partial evidence	Manchester, United Kingdom	1,001-5,000	684 contacts →
	Partial evidence “At Roke, we stand at the forefront of defence and security, delivering cutting-edge intelligence and engineering solutions that protect nations, troops, borders, and businesses.” Source: RevenueBase Database · checked Sep 1, 2026
2	Metrea	Partial evidence	London, United Kingdom	501-1,000	674 contacts →
	Partial evidence “Metrea, formerly Meta Aerospace, offers a deep stack of defense capabilities and services for our customers and partners, allowing them to anticipate, secure, and defend their…” Source: RevenueBase Database · checked Sep 1, 2026
3	Everfox	Indirect evidence	London, United Kingdom	1,001-5,000	635 contacts →
	Indirect evidence “Everfox delivers trusted connectivity to protect the world's most critical environments, safeguarding the sensitive information behind decision advantage.” Source: RevenueBase Database · checked Sep 1, 2026
4	MASS	Indirect evidence	Lincoln, United Kingdom	201-500	633 contacts →
	Indirect evidence “MASS, part of the Cohort plc group, helps you realise the value of your data.” Source: RevenueBase Database · checked Sep 1, 2026
5	Calytrix Technologies	Partial evidence	United Kingdom	51-200	58 contacts →
	Partial evidence “Calytrix Technologies is a Training and Simulation company specialising in developing and delivering integrated training solutions.” Source: RevenueBase Database · checked Sep 1, 2026
6	Brotecs Technologies	Partial evidence	London, United Kingdom	51-200	58 contacts →
	Partial evidence “Since 2006, Brotecs Technologies has been a global leader (U.S.” Source: RevenueBase Database · checked Sep 1, 2026
7	Parico	Partial evidence	Bordon, United Kingdom	11-50	33 contacts →
	Partial evidence “Standing at the crossroads of designing, building, testing and deploying secure solutions for Defence.” Source: RevenueBase Database · checked Sep 1, 2026
8	Hamiltonian Dynamics	Indirect evidence	Manchester, United Kingdom	11-50	23 contacts →
	Indirect evidence “At Hamiltonian Dynamics we have a secure by design engineering mindset built into the core of our company.” Source: RevenueBase Database · checked Sep 1, 2026
9	Itsus Consulting	Indirect evidence	Llanishen Cardiff South, United Kingdom	11-50	20 contacts →
	Indirect evidence “Our purpose: We foster a forward-thinking, multi-disciplinary organisation that continues to attract talented people and collaborates with like-minded organisations to make a…” Source: RevenueBase Database · checked Sep 1, 2026
10	Borwell	Partial evidence	Great Malvern, United Kingdom	11-50	20 contacts →
	Partial evidence “From 2003 to 2023 the borwell team delivered software and IT solutions to the UK MoD and to UK Government departments, which were 'secure by design'.” Source: RevenueBase Database · checked Sep 1, 2026
11	Disruptive Industries	Indirect evidence	London, United Kingdom	11-50	19 contacts →
	Indirect evidence “At Disruptive Industries, we believe in going beyond-beyond data, beyond limits, beyond the ordinary.” Source: RevenueBase Database · checked Sep 1, 2026
12	Sirius Digital Services	Partial evidence	Portsmouth, United Kingdom	11-50	18 contacts →
	Partial evidence “Sirius Digital Services specialises in Software Engineering Services and AI, including 3D modelling and simulation, synthetic environments and data science, as well as…” Source: RevenueBase Database · checked Sep 1, 2026
13	Exsel Group	Strong evidence	London, United Kingdom	51-200	17 contacts →
	Strong evidence “The Exsel Group is a leading independent defence technology solutions company – providing engineering solutions, technology systems and support services to Defence and Industry…” Source: RevenueBase Database · checked Sep 1, 2026
14	Espanaro	Partial evidence	Newtown Wales, United Kingdom	11-50	14 contacts →
	Partial evidence “We design, build, and deliver secure digital systems for defence, national security, and critical national infrastructure.” Source: RevenueBase Database · checked Sep 1, 2026
15	Antillion	Indirect evidence	Bristol, United Kingdom	11-50	12 contacts →
	Indirect evidence “We are a small, dynamic product and services company based in Bristol, UK.” Source: RevenueBase Database · checked Sep 1, 2026
16	Igence Software LTD	Partial evidence	East Grinstead, United Kingdom	11-50	11 contacts →
	Partial evidence “At Igence, our 20+ years experience with 500+ man years of cumulative software capabilities enables us to modernise systems, integrate software packages, enable visualisation of…” Source: RevenueBase Database · checked Sep 1, 2026
17	Cirrus Software Solutions	Partial evidence	Bristol, United Kingdom	11-50	11 contacts →
	Partial evidence “Cirrus Software Solutions provides the UK government with expertise in delivering high-quality secure software and systems engineering with a particular focus on transitioning to…” Source: RevenueBase Database · checked Sep 1, 2026
18	2ic Limited	Indirect evidence	Richmond, United Kingdom	1-10	11 contacts →
	Indirect evidence “Global leaders in digital interoperability in the battlespace.” Source: RevenueBase Database · checked Sep 1, 2026
19	Foundry Zero	Indirect evidence	Cheltenham, United Kingdom	11-50	10 contacts →
	Indirect evidence “We're a specialised supplier providing cyber security research, engineering services and training.” Source: RevenueBase Database · checked Sep 1, 2026
20	Devnack	Partial evidence	Edinburgh, United Kingdom	11-50	6 contacts →
	Partial evidence “Welcome to DevNack - Your trusted partner for bespoke software solutions.” Source: RevenueBase Database · checked Sep 1, 2026
21	The Aardvark Group	Strong evidence	Dumfries, United Kingdom	11-50	4 contacts →
	Strong evidence “DEFENCE AND SECURITY SOLUTIONS FOR A COMPLEX WORLD Developing and delivering highly impactful technical solutions through the deployment of innovative technologies, techniques…” Source: RevenueBase Database · checked Sep 1, 2026
22	Ultra Horizon	Partial evidence	London, United Kingdom	1-10	4 contacts →
	Partial evidence “Ultra Horizon Ltd is a cyber security company comprised of computer scientists who design bespoke security solutions for the maritime and defence sector.” Source: RevenueBase Database · checked Sep 1, 2026
23	Tekchain LTD	Partial evidence	London, United Kingdom	1-10	2 contacts →
	Partial evidence “To thrive in today’s world you need reliable, secure, well-designed software – so you can focus on your core business.” Source: RevenueBase Database · checked Sep 1, 2026
24	Harmonic Software Systems	Strong evidence	United Kingdom	1-10	2 contacts →
	Strong evidence “Harmonic Software Systsems is an embedded software engineering company that fixes, develops and tests embedded software for the aerospace & defence industry specialising in…” Source: RevenueBase Database · checked Sep 1, 2026
25	Newton Systems LTD	Partial evidence	New Waltham, United Kingdom	1-10	2 contacts →
	Partial evidence “Stopping hackers and creating secure software since 2015 - to the fintech, banking and aerospace industry.” Source: RevenueBase Database · checked Sep 1, 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: defense technology software startups. 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 defense technology software startups.
Partial evidence: Its own public description names part of defense technology software startups, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name defense technology software startups. 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 67 defense technology software startups based in the United Kingdom

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Defense technology software startups based in the United Kingdom at a glance

As of Sep 1, 2026

30.0%Verified-email coverage

21.4%Mobile-number coverage

46.5Average contacts per company

11-50Median size (employees)

32.8%Largest-city concentration · London

Sep 1, 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 defense technology software startups, 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 the United Kingdom whose own description of what they do matches “defense technology software startups”. 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 defense technology software startups), 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 defense technology software startups, and records with no verified work email. Companies headquartered outside United Kingdom 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, 935 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 1, 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.

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 defense technology software startups, 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 defense technology software startups are there based in the United Kingdom?

RevenueBase identified 67 defense technology software startups headquartered in the 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?

ROKE, headquartered in Manchester, tops this list with the largest team on record.

Which city has the most defense technology software startups?

London leads with 22 headquartered companies, followed by Manchester (6) and Edinburgh (2).

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 935 verified decision-maker contacts tracked across these 67 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 1, 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.