Company lists · Data refreshed September 2026

Top 17 Naval systems integrators based in the United Kingdom

RevenueBase identified 35 naval systems integrators headquartered in the United Kingdom as of September 2026 and tracks 1,276 professional contacts across them, including 487 with verified work emails. Southampton is the largest hub.

This list covers naval systems integrators 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 29, 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 HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 29, 2026 86% judged on-target in blind review
35Companies
1,276Contacts tracked
487Verified emails
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The 17 largest naval systems integrators based in the United Kingdom

Ranked by team size
Top 17 of 35 naval systems integrators based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to naval systems integrators: 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Partial evidenceBeckington, United KingdomHQ checked Sep 29, 2026201-500392 contacts →

Partial evidence

“For over 60 years, SEA has delivered research, development, manufacturing, training, and support of complex maritime systems to the Royal Navy, international partners, and…”

Source: RevenueBase Database · checked Sep 29, 2026
2Partial evidenceHorsham, United KingdomHQ checked Sep 29, 2026201-500176 contacts →

Partial evidence

“Defence Leaders around the world work with Chess for market-leading, reliable defence systems.”

Source: RevenueBase Database · checked Sep 29, 2026
3Partial evidencePortsmouth, United KingdomHQ checked Sep 29, 2026201-50076 contacts →

Partial evidence

“CMS2 has over 60-years’ experience of designing, developing, manufacturing and supporting atmosphere management and life support systems for submarines and other critical…”

Source: RevenueBase Database · checked Sep 29, 2026
4Indirect evidenceYateley, United KingdomHQ checked Sep 29, 202611-5036 contacts →

Indirect evidence

“We solve the defence challenges of today and tomorrow, enabling navies to dominate the underwater battlespace through next generation situational awareness technology.”

Source: RevenueBase Database · checked Sep 29, 2026
5Indirect evidenceMilton Keynes, United KingdomHQ checked Sep 29, 202611-5027 contacts →

Indirect evidence

“Electrical Solutions for the most demanding marine environments • Electrical Control and Distribution Panels • Ruggedised Electrical/Electronic Enclosures and Cabinets • Embarked…”

Source: RevenueBase Database · checked Sep 29, 2026
6Partial evidenceNorth Shields, United KingdomHQ checked Sep 29, 202611-5024 contacts →

Partial evidence

“Fleet Readiness Through Integrated Logistics Support (ILS) With over 60 years of experience,"Isherwoods", a CMN NAVAL subsidiary, is a trusted leader in Integrated Logistics…”

Source: RevenueBase Database · checked Sep 29, 2026
7Partial evidenceSouthampton, United KingdomHQ checked Sep 29, 202611-5017 contacts →

Partial evidence

“Diverse Yachts and C-Designs merge into Diverse Performance Systems Diverse Yachts is a leading supplier of custom marine electronics, technical hardware, and load cells, while…”

Source: RevenueBase Database · checked Sep 29, 2026
8Partial evidenceSouthampton, United KingdomHQ checked Sep 29, 202611-5012 contacts →

Partial evidence

“Welcome to AMI Marine AMI specialise in Bridge Safety and Navigation Systems Products - Voyage Data Recorders - Ship Navigation - BNWAS - Course Recorders - Interfacing - Test…”

Source: RevenueBase Database · checked Sep 29, 2026
9Partial evidenceNewport, United KingdomHQ checked Sep 29, 202611-508 contacts →

Partial evidence

“Marine Data Systems Limited, a British multi award-winning manufacturer of marine navigation and control systems for civil, defence and government agencies.”

Source: RevenueBase Database · checked Sep 29, 2026
10Indirect evidenceSouthampton, United KingdomHQ checked Sep 29, 20261-108 contacts →

Indirect evidence

“We deliver end to end marine engineering for commercial, pleasure and defence vessels.”

Source: RevenueBase Database · checked Sep 29, 2026
11Strong evidenceNailsworth, United KingdomHQ checked Sep 29, 202611-507 contacts →

Strong evidence

“Steller Systems is a leading independent consultancy practice specialising in Naval Architecture, Marine Engineering and Systems Engineering.”

Source: RevenueBase Database · checked Sep 29, 2026
12Indirect evidenceLiverpool, United KingdomHQ checked Sep 29, 202611-506 contacts →

Indirect evidence

Source: RevenueBase Database · checked Sep 29, 2026
13Strong evidenceBristol, United KingdomHQ checked Sep 29, 202611-506 contacts →

Strong evidence

“Fleetwind Ltd is an ISO 9001-accredited maritime systems engineering company specialising in the integration and sustainment of complex naval platforms and systems.”

Source: RevenueBase Database · checked Sep 29, 2026
14Strong evidenceTotton, United KingdomHQ checked Sep 29, 202611-505 contacts →

Strong evidence

“Marine Electronic Systems is a leading systems integrator, supplier and installer of navigation systems (including integrated bridge systems), radio communications, CCTV and video…”

Source: RevenueBase Database · checked Sep 29, 2026
15Partial evidenceChelmsford, United KingdomHQ checked Sep 29, 20261-104 contacts →

Partial evidence

“Specialising in communications systems for the marine industry including onboard GSM, Radio (TETRA, DMR & Analogue) and integration of all onboard systems”

Source: RevenueBase Database · checked Sep 29, 2026
16Partial evidenceGuildford, United KingdomHQ checked Sep 29, 20261-103 contacts →

Partial evidence

“At Crest Systems, we specialise in technical system management and consultancy for the superyacht industry.”

Source: RevenueBase Database · checked Sep 29, 2026
17Partial evidencePlymouth, United KingdomHQ checked Sep 29, 20261-103 contacts →

Partial evidence

“Protean Engineering Ltd was formed in 1994 as an independent defence contractor specialising in installation design solutions for combat and ships systems for the UK MoD and…”

Source: RevenueBase Database · checked Sep 29, 2026

Showing 17 of 35 naval systems integrators based in the United Kingdom

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Naval systems integrators based in the United Kingdom at a glance

As of Sep 29, 2026
38.2%Verified-email coverage
36.5Average contacts per company
11-50Median size (employees)
11.4%Largest-city concentration · Southampton
Sep 29, 2026Page data refreshed

Companies by employee count

1-10
13
11-50
13
51-200
2
201-500
4
501-1,000
1
1,001-5,000
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 35 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 naval systems integrators, 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 “naval systems integrators”. 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 naval systems integrators), 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 naval systems integrators, 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, 487 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 29, 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 naval systems integrators, 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 naval systems integrators are there based in the United Kingdom?

RevenueBase identified 35 naval systems integrators 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?

Systems Engineering & Assessment LTD, headquartered in Beckington, tops this list with the largest team on record.

Which city has the most naval systems integrators?

Southampton leads with 4 headquartered companies, followed by London (3) and Chelmsford (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 487 verified decision-maker contacts tracked across these 35 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 29, 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.