Company lists · Data refreshed September 2026

Top 25 Marine systems integration companies based in the United Kingdom

Name: Marine systems integration companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 5, 2026 389 companies tracked

RevenueBase identified 389 marine systems integration companies headquartered in the United Kingdom as of September 2026 and tracks 7,877 professional contacts across them, including 2,034 with verified work emails and 549 with mobile numbers. London is the largest hub.

This list covers marine systems integration 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 5, 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 5, 2026 86% judged on-target in blind review

389Companies

7,877Contacts tracked

2,034Verified emails

549Mobile numbers

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The 25 largest marine systems integration companies based in the United Kingdom

Ranked by team size

Top 25 of 389 marine systems integration companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names marine systems integration 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	Ultra Electronics GroupIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	5,001-10,000	840
	“Ultra Electronics” Source: company website · checked Sep 5, 2026
2	Systems Engineering & Assessment LTDStrong evidence	Beckington, United KingdomHQ checked Sep 5, 2026	201-500	392
	“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: company website · checked Sep 5, 2026
3	Sperry MarinePartial evidence	New Malden, United KingdomHQ checked Sep 5, 2026	201-500	279
	“Sperry Marine provides the commercial and defence maritime industry with Navigation Solutions that excel in efficiency, reliability and safety.” Source: company website · checked Sep 5, 2026
4	Apcl A&p Group LimitedPartial evidence	Hebburn, United KingdomHQ checked Sep 5, 2026	501-1,000	240
	“A&P, part of the APCL Group, is a global marine engineering business which operates six dry docks across two strategic locations in the UK and delivers engineering excellence to…” Source: company website · checked Sep 5, 2026
5	MJM MarinePartial evidence	Newry, United KingdomHQ checked Sep 5, 2026	201-500	236
	“Crafting Exceptional Spaces Since 1983 At MJM Marine, our motivation is simple: to create spaces that transcend functionality and provide unparalleled experiences for people to…” Source: company website · checked Sep 5, 2026
6	Mactaggart ScottPartial evidence	Loanhead, United KingdomHQ checked Sep 5, 2026	201-500	210
	“A Scottish engineering company founded in 1898, MacTaggart Scott supports the Naval Defence and Marine market.” Source: company website · checked Sep 5, 2026
7	James Fisher FendercarePartial evidence	Norwich, United KingdomHQ checked Sep 5, 2026	1,001-5,000	204
	“Shaping the future of maritime.” Source: company website · checked Sep 5, 2026
8	SRT Marine Systems PLCStrong evidence	Midsomer Norton, United KingdomHQ checked Sep 5, 2026	51-200	129
	“SRT Marine Systems PLC is a global leader and innovator in maritime surveillance, intelligence, navigation safety and situational awareness.” Source: company website · checked Sep 5, 2026
9	Star InternationalIndirect evidence	Birkenhead, United KingdomHQ checked Sep 5, 2026	51-200	103
	“Star International specialises in keeping vessels safe and compliant.” Source: company website · checked Sep 5, 2026
10	CathelcoIndirect evidence	Chesterfield, United KingdomHQ checked Sep 5, 2026	51-200	91
	“Cathelco safeguards your fleet by managing biofouling, ensuring corrosion protection, and generating freshwater Our offering: Ultrasonic Antifouling - Cathelco's DragGone™…” Source: company website · checked Sep 5, 2026
11	SMS Group Ship Repair Marine Interiors Marine Engineering SC SqepPartial evidence	Southampton, United KingdomHQ checked Sep 5, 2026	51-200	89
	“Southampton Marine Services Ltd was established in 2004 and specialises in ship / work boat building, vessel repair and marine engineering; we trade in four markets - Commercial…” Source: company website · checked Sep 5, 2026
12	Shearwater Marine ServicesPartial evidence	Sandbank, United KingdomHQ checked Sep 5, 2026	51-200	87
	“Founded in 1992, Shearwater Marine Services have since grown to become a highly respected topside and sub-surface marine engineering service provider.” Source: company website · checked Sep 5, 2026
13	SeebyteStrong evidence	Edinburgh, United KingdomHQ checked Sep 5, 2026	51-200	81
	“SeeByte provides clients in the global maritime industry with the most advanced software solutions to enhance the capabilities of their uncrewed systems.” Source: company website · checked Sep 5, 2026
14	Cms2Partial evidence	Portsmouth, United KingdomHQ checked Sep 5, 2026	201-500	76
	“CMS2 has over 60-years’ experience of designing, developing, manufacturing and supporting atmosphere management and life support systems for submarines and other critical…” Source: company website · checked Sep 5, 2026
15	Kraken Technology GroupPartial evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	76
	“High-performance dual-use composite littoral platforms for defence and commercial application in the maritime industry.” Source: company website · checked Sep 5, 2026
16	Trimline LTD Award-Winning Marine Interior OutfitterPartial evidence	Southampton, United KingdomHQ checked Sep 5, 2026	11-50	66
	“Marine Interior Outfitting - Cruise, Ferry & Defence.” Source: company website · checked Sep 5, 2026
17	Atlantic Pacific Marine LTDPartial evidence	Cardiff, United KingdomHQ checked Sep 5, 2026	11-50	63
	“Atlantic Pacific Marine is your dedicated marine service specialist.” Source: company website · checked Sep 5, 2026
18	Mcgeoch Technology LimitedPartial evidence	Birmingham, United KingdomHQ checked Sep 5, 2026	51-200	54
	“McGeoch Technology specialises in the design and manufacture of high-quality electrical control and instrumentation systems and specialist lighting for both land and sea…” Source: company website · checked Sep 5, 2026
19	BerthonIndirect evidence	Lymington, United KingdomHQ checked Sep 5, 2026	51-200	49
	“Berthon has been trading from our riverside site in Lymington since 1877.” Source: company website · checked Sep 5, 2026
20	The Seaking GroupPartial evidence	Birkenhead, United KingdomHQ checked Sep 5, 2026	51-200	46
	“The SeaKing Group offers specialist electrical engineering services to the marine, industrial, commercial, military and offshore sectors.” Source: company website · checked Sep 5, 2026
21	Malakoff LimitedPartial evidence	North Ness, United KingdomHQ checked Sep 5, 2026	51-200	46
	“A Shetland based marine engineering company with a long history and diverse range of services.” Source: company website · checked Sep 5, 2026
22	GME Services Global Maritime Engineering ServicesPartial evidence	Bridgend, United KingdomHQ checked Sep 5, 2026	501-1,000	42
	“GME Services Limited provides complete engineering management & support for the maritime industry; working Globally, 24 hours a day, 365 days a year.” Source: company website · checked Sep 5, 2026
23	Coda Octopus ProductsIndirect evidence	Edinburgh, United KingdomHQ checked Sep 5, 2026	51-200	41
	“Coda Octopus is a global leader and specialist in underwater technologies including being the patent holder for the real-time 3D sonar, the Echoscope®.” Source: company website · checked Sep 5, 2026
24	Stone Marine ServicesPartial evidence	Inverkeithing, United KingdomHQ checked Sep 5, 2026	11-50	41
	“Stone Marine Services was founded in and now operates from three strategic locations in the UK, South Africa and Namibia.” Source: company website · checked Sep 5, 2026
25	Icon ConnectPartial evidence	Letchworth, United KingdomHQ checked Sep 5, 2026	51-200	40
	“Icon Connect are a world leader in integrated Audio Visual, Security, IT and Control systems.” Source: company website · checked Sep 5, 2026

Showing 25 of 389 marine systems integration companies based in the United Kingdom

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Marine systems integration companies based in the United Kingdom at a glance

As of Sep 5, 2026

1-10Median size (employees)

LondonLargest hub · 39 HQs

549Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

223

11-50

106

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Verified emails by last verification

0–30

1,916

31–60

113

61–90

90–180

180+

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 marine systems integration 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 “marine systems integration 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 marine systems integration 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, 2,034 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 5, 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.

Marine systems integration companies by metro

Marine systems integration companies in London39
Marine systems integration companies in Southampton25

Frequently asked

How many marine systems integration companies are there based in the United Kingdom?

RevenueBase identified 389 marine systems integration 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?

Ultra Electronics Group, headquartered in London, tops this list with the largest team on record.

Which city has the most marine systems integration companies?

London leads with 39 headquartered companies, followed by Southampton (25) and Poole (10).

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 2,034 verified decision-maker contacts tracked across these 389 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 5, 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.