Company lists · Data refreshed September 2026
Top 13 Secure military communication software companies based in the United Kingdom
RevenueBase identified 30 secure military communication software companies headquartered in the United Kingdom as of September 2026 and tracks 705 professional contacts across them, including 201 with verified work emails and 71 with mobile numbers. London is the largest hub.
This list covers secure military communication software companies 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, 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.
The 13 largest secure military communication software companies based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 173 | ||||
“ALL.SPACE isn’t just revolutionizing communication; we’re shaping the very future of defense operations, with the most advanced tactical multi-link mobility terminals-seamlessly…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 2 | 38 | ||||
“At Airsys, we are a leading distributor in secure instant communications.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 3 | Isode LTDStrong evidence | 37 | |||
“Since 2002 Isode has been developing and supporting Commercial off the shelf (COTS) client & server software for secure messaging and directory systems.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 4 | 23 | ||||
“4Secure is a trusted provider of software defined, cross-network/cross-domain cybersecurity solutions for commercial, government and defence.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 5 | Spectra GroupStrong evidence | 21 | |||
“Spectra Group (UK) Ltd is a British communications engineering company delivering mission-critical tactical communications systems for defence and security organisations worldwide.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 6 | Salt CommunicationsStrong evidence | 18 | |||
“Salt is a secure communications system that provides the best armour organisations have to protect their trade secrets and other sensitive, strategic and proprietary information…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 7 | ParadigmIndirect evidence | 17 | |||
“Paradigm is making the world’s most advanced satcom, simple.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 8 | G6 GlobalPartial evidence | 13 | |||
“G6 are industry leaders in the provision of radio and satellite voice and data communication solutions.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 9 | 12 | ||||
“Cyber1st is a research and development company based out of Belper, Derbyshire, United Kingdom.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 10 | 11 | ||||
“Global leaders in digital interoperability in the battlespace.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 11 | 11 | ||||
“Armour Communications enable organisations in Government and Enterprise environments to collaborate by securing their communication channels including their Voice, Instant…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 12 | AmiosecIndirect evidence | 2 | |||
“Amiosec is an exciting UK technology company and is a trusted SME and technology partner of choice for our customers.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 13 | 2 | ||||
“Cell Guard is a secure communications company based in London and Warsaw manufacturing encrypted smartphones and developers of various IP registered secure smartphone applications…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
Showing 13 of 30 secure military communication software companies based in the United Kingdom
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Secure military communication software companies based in the United Kingdom at a glance
As of Sep 6, 2026Companies by employee count
Verified emails by last verification
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 military communication software 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 the United Kingdom whose own description of what they do matches “secure military communication software 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 military communication software companies, 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 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, 201 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.
Frequently asked
How many secure military communication software companies are there based in the United Kingdom?
RevenueBase identified 30 secure military communication software companies 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?
all.space, headquartered in Reading, tops this list with the largest team on record.
Which city has the most secure military communication software companies?
London leads with 8 headquartered companies, followed by Alton (2) and Hereford (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 201 verified decision-maker contacts tracked across these 30 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.
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