Company lists · Data refreshed September 2026

Top 10 Government defense contractors based in the United Kingdom

RevenueBase identified 26 company matches for government defense contractors associated with the United Kingdom as of September 2026 and tracks 27,251 professional contacts across them, including 10,873 with verified work emails. London is the largest hub.

This list covers company matches for government defense contractors 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 September 16, 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 16, 2026 How this list was built
26Companies
27,251Contacts tracked
10,873Verified emails
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The 10 largest government defense contractors based in the United Kingdom

Ranked by team size
Top 10 of 26 company matches for government defense contractors based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 16, 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 matchLondon, United KingdomHQ recorded Sep 16, 202610001+25,859 contacts →

Exact match

“At Rolls-Royce, we're a force for progress: powering, protecting and connecting people everywhere.”

Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
2Exact matchChristchurch, United KingdomHQ recorded Sep 16, 2026501-1,000795 contacts →

Exact match

“Cobham Ltd”

Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
3Exact matchUnited KingdomHQ recorded Sep 16, 2026501-1,000130 contacts →

Exact match

“ESUK is a trusted partner to the UK Armed Forces, delivering advanced technology and innovation that strengthen national security and operational advantage.”

Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
4Exact matchGosport, United KingdomHQ recorded Sep 16, 202651-200120 contacts →

Exact match

“STS Defence, a part of the Cicor Group, is a UK-based engineering and technology company specialising in mission-critical, secure communications & networks, electronic warfare &…”

Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
5Exact matchSandwich, United KingdomHQ recorded Sep 16, 202651-20044 contacts →

Exact match

“WE ARE HIRING - Instro are a rapidly evolving company with some exciting new roles available to support our growth and strategy.”

Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
6Exact matchHertford, United KingdomHQ recorded Sep 16, 202611-5019 contacts →

Exact match

“ISTEC SERVICES LIMITED Design, Develop and Supply Small to Medium Weapon Mounting Systems, Optical Sighting Equipment and Weapon Ancillaries for Land, Sea and Air applications.”

Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
7Exact matchLondon, United KingdomHQ recorded Sep 16, 202651-20018 contacts →

Exact match

“The Exsel Group is a leading independent defence technology solutions company – providing engineering solutions, technology systems and support services to Defence and Industry…”

Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
8Exact matchBristol, United KingdomHQ recorded Sep 16, 202611-5012 contacts →

Exact match

“We are a small, dynamic product and services company based in Bristol, UK.”

Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
9Exact matchSlough, United KingdomHQ recorded Sep 16, 202611-509 contacts →

Exact match

“AEI Systems – SYS Group | 65+ Years of Medium-Calibre Firepower Excellence AEI Systems (UK), a valued member of the SYS Group – one of Türkiye’s top 10 defence companies – and is…”

Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
10Exact matchLondon, United KingdomHQ recorded Sep 16, 202611-506 contacts →

Exact match

“Commercial, Industrial, and Defence systems, engineered in the United Kingdom.”

Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase

Showing 10 of 26 government defense contractors based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 10,873 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Government defense contractors based in the United Kingdom at a glance

As of Sep 16, 2026
39.9%Verified-email coverage
1048.1Average contacts per company
11-50Median size (employees)
19.2%Largest-city concentration · London
Sep 16, 2026Page data refreshed

Companies by employee count

1-10
7
11-50
10
51-200
4
501-1,000
2
10001+
2

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 26 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 “government defense contractors” 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 10,873 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 16, 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 “government defense contractors”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many government defense contractors are there based in the United Kingdom?

RevenueBase identified 26 company matches for government defense contractors associated with the 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?

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

Which city has the most government defense contractors?

London leads with 5 company records, followed by Bristol (2) and Cardiff (1).

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 10,873 professional contacts with verified work emails tracked across these 26 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 16, 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.