Company lists · Data refreshed September 2026

Top 25 Marine systems integration firms based in the United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 366 companies tracked

RevenueBase identified 366 marine systems integration firms headquartered in the United Kingdom as of September 2026 and tracks 7,693 professional contacts across them, including 1,879 with verified work emails. London is the largest hub.

This list covers marine systems integration firms 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 28, 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 28, 2026 86% judged on-target in blind review

366Companies

7,693Contacts tracked

1,879Verified emails

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

Ranked by team size

Top 25 of 366 marine systems integration firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to marine systems integration firms: 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	Ultra Electronics Group	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	5,001-10,000	840 contacts →
	Indirect evidence “Ultra Electronics” Source: RevenueBase Database · checked Sep 28, 2026
2	James Fisher And Sons PLC	Indirect evidence	Barrow-in-furness, United KingdomHQ checked Sep 28, 2026	1,001-5,000	403 contacts →
	Indirect evidence “Above, below and beyond the world’s oceans.” Source: RevenueBase Database · checked Sep 28, 2026
3	SMD	Indirect evidence	Wallsend, United KingdomHQ checked Sep 28, 2026	51-200	292 contacts →
	Indirect evidence “SMD is an advanced global designer and manufacturer of subsea remotely operated and autonomous power and control solutions.” Source: RevenueBase Database · checked Sep 28, 2026
4	Sperry Marine	Partial evidence	New Malden, United KingdomHQ checked Sep 28, 2026	201-500	279 contacts →
	Partial evidence “Sperry Marine provides the commercial and defence maritime industry with Navigation Solutions that excel in efficiency, reliability and safety.” Source: RevenueBase Database · checked Sep 28, 2026
5	Apcl A&p Group Limited	Partial evidence	Hebburn, United KingdomHQ checked Sep 28, 2026	501-1,000	240 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 28, 2026
6	MJM Marine	Partial evidence	Newry, United KingdomHQ checked Sep 28, 2026	201-500	236 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 28, 2026
7	Ideaworks	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	158 contacts →
	Indirect evidence “Ideaworks is a global leader in the design, supply, engineering, and aftercare of technology experiences for luxury spaces on land and at sea, including private homes…” Source: RevenueBase Database · checked Sep 28, 2026
8	SRT Marine Systems PLC	Strong evidence	Midsomer Norton, United KingdomHQ checked Sep 28, 2026	51-200	129 contacts →
	Strong evidence “SRT Marine Systems PLC is a global leader and innovator in maritime surveillance, intelligence, navigation safety and situational awareness.” Source: RevenueBase Database · checked Sep 28, 2026
9	Spectec	Partial evidence	Manchester, United KingdomHQ checked Sep 28, 2026	51-200	113 contacts →
	Partial evidence “SpecTec is a market-leading maritime technology company specialising in asset management software.” Source: RevenueBase Database · checked Sep 28, 2026
10	Star International	Indirect evidence	Birkenhead, United KingdomHQ checked Sep 28, 2026	51-200	103 contacts →
	Indirect evidence “Star International specialises in keeping vessels safe and compliant.” Source: RevenueBase Database · checked Sep 28, 2026
11	Cathelco	Indirect evidence	Chesterfield, United KingdomHQ checked Sep 28, 2026	51-200	91 contacts →
	Indirect evidence “Cathelco safeguards your fleet by managing biofouling, ensuring corrosion protection, and generating freshwater Our offering: Ultrasonic Antifouling - Cathelco's DragGone™…” Source: RevenueBase Database · checked Sep 28, 2026
12	SMS Group Ship Repair Marine Interiors Marine Engineering SC Sqep	Partial evidence	Southampton, United KingdomHQ checked Sep 28, 2026	51-200	89 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 28, 2026
13	Seebyte	Strong evidence	Edinburgh, United KingdomHQ checked Sep 28, 2026	51-200	81 contacts →
	Strong evidence “SeeByte provides clients in the global maritime industry with the most advanced software solutions to enhance the capabilities of their uncrewed systems.” Source: RevenueBase Database · checked Sep 28, 2026
14	Ulysses Systems	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	78 contacts →
	Strong evidence “Ulysses Systems is a leading marine industry provider of enterprise software.” Source: RevenueBase Database · checked Sep 28, 2026
15	Cms2	Partial evidence	Portsmouth, United KingdomHQ checked Sep 28, 2026	201-500	76 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 28, 2026
16	Trimline LTD Award-Winning Marine Interior Outfitter	Partial evidence	Southampton, United KingdomHQ checked Sep 28, 2026	11-50	66 contacts →
	Partial evidence “Marine Interior Outfitting - Cruise, Ferry & Defence.” Source: RevenueBase Database · checked Sep 28, 2026
17	Atlantic Pacific Marine LTD	Partial evidence	Cardiff, United KingdomHQ checked Sep 28, 2026	11-50	63 contacts →
	Partial evidence “Atlantic Pacific Marine is your dedicated marine service specialist.” Source: RevenueBase Database · checked Sep 28, 2026
18	Mcgeoch Technology Limited	Partial evidence	Birmingham, United KingdomHQ checked Sep 28, 2026	51-200	54 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 28, 2026
19	Berthon	Indirect evidence	Lymington, United KingdomHQ checked Sep 28, 2026	51-200	49 contacts →
	Indirect evidence “Berthon has been trading from our riverside site in Lymington since 1877.” Source: RevenueBase Database · checked Sep 28, 2026
20	The Seaking Group	Partial evidence	Birkenhead, United KingdomHQ checked Sep 28, 2026	51-200	46 contacts →
	Partial evidence “The SeaKing Group offers specialist electrical engineering services to the marine, industrial, commercial, military and offshore sectors.” Source: RevenueBase Database · checked Sep 28, 2026
21	GME Services Global Maritime Engineering Services	Partial evidence	Bridgend, United KingdomHQ checked Sep 28, 2026	501-1,000	42 contacts →
	Partial evidence “GME Services Limited provides complete engineering management & support for the maritime industry; working Globally, 24 hours a day, 365 days a year.” Source: RevenueBase Database · checked Sep 28, 2026
22	Coda Octopus Products	Indirect evidence	Edinburgh, United KingdomHQ checked Sep 28, 2026	51-200	41 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 28, 2026
23	Stone Marine Services	Partial evidence	Inverkeithing, United KingdomHQ checked Sep 28, 2026	11-50	41 contacts →
	Partial evidence “Stone Marine Services was founded in and now operates from three strategic locations in the UK, South Africa and Namibia.” Source: RevenueBase Database · checked Sep 28, 2026
24	Icon Connect	Partial evidence	Letchworth, United KingdomHQ checked Sep 28, 2026	51-200	40 contacts →
	Partial evidence “Icon Connect are a world leader in integrated Audio Visual, Security, IT and Control systems.” Source: RevenueBase Database · checked Sep 28, 2026
25	Orwell Offshore	Indirect evidence	Ipswich, United KingdomHQ checked Sep 28, 2026	51-200	38 contacts →
	Indirect evidence “Orwell Offshore, established in 2006, is a UK headquartered Naval Architecture and Offshore Engineering company with offices in Ipswich, London, Singapore, Nigeria, and Indonesia.” Source: RevenueBase Database · checked Sep 28, 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: marine systems integration firms. 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 marine systems integration firms.
Partial evidence: Its own public description names part of marine systems integration firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name marine systems integration firms. 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 366 marine systems integration firms based in the United Kingdom

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

As of Sep 28, 2026

24.4%Verified-email coverage

21.0Average contacts per company

1-10Median size (employees)

11.5%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

211

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

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 366 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 marine systems integration firms, 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 “marine systems integration firms”. 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 marine systems integration firms), 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 marine systems integration firms, 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, 1,879 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 28, 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 firms by metro

Marine systems integration firms in London42

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 marine systems integration firms, 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 marine systems integration firms are there based in the United Kingdom?

RevenueBase identified 366 marine systems integration firms 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 firms?

London leads with 42 headquartered companies, followed by Southampton (23) 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 1,879 verified decision-maker contacts tracked across these 366 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 28, 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.