Company lists · Data refreshed September 2026

Top 25 Marine technology companies based in the United Kingdom

Name: Marine technology 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 20, 2026 490 companies tracked

RevenueBase identified 490 marine technology companies headquartered in the United Kingdom as of September 2026 and tracks 10,791 professional contacts across them, including 3,884 with verified work emails. London is the largest hub.

This list covers marine technology 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 20, 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 20, 2026 86% judged on-target in blind review

490Companies

10,791Contacts tracked

3,884Verified emails

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The 25 largest marine technology companies based in the United Kingdom

Ranked by team size

Top 25 of 490 marine technology companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to marine technology companies: 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	Ocean Infinity	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	501-1,000	714 contacts →
	Partial evidence “Ocean Infinity is a technology-driven company transforming how ocean operations are carried out.” Source: RevenueBase Database · checked Sep 20, 2026
2	Boskalis Subsea Services	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 20, 2026	201-500	516 contacts →
	Indirect evidence “Boskalis Subsea Services is a world-leading provider of specialist subsea solutions for the offshore energy industry, seamlessly integrating services to deliver optimum results.” Source: RevenueBase Database · checked Sep 20, 2026
3	James Fisher And Sons PLC	Indirect evidence	Barrow-in-furness, United KingdomHQ checked Sep 20, 2026	1,001-5,000	403 contacts →
	Indirect evidence “Above, below and beyond the world’s oceans.” Source: RevenueBase Database · checked Sep 20, 2026
4	Briggs Marine	Partial evidence	Burntisland, United KingdomHQ checked Sep 20, 2026	501-1,000	387 contacts →
	Partial evidence “Briggs Marine is a leading provider of marine and environmental services, specialising in port and marine operations, subsea and environmental support and vessel charter.” Source: RevenueBase Database · checked Sep 20, 2026
5	SMD	Indirect evidence	Wallsend, United KingdomHQ checked Sep 20, 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 20, 2026
6	Sperry Marine	Partial evidence	New Malden, United KingdomHQ checked Sep 20, 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 20, 2026
7	Sonardyne International LTD	Indirect evidence	Yateley, United KingdomHQ checked Sep 20, 2026	201-500	273 contacts →
	Indirect evidence “Underwater innovations for energy, defence and science.” Source: RevenueBase Database · checked Sep 20, 2026
8	Cyan Sentinel Limited	Partial evidence	Aberdeen, United KingdomHQ checked Sep 20, 2026	51-200	249 contacts →
	Partial evidence “An International Shipowning and Marine Investment Company.” Source: RevenueBase Database · checked Sep 20, 2026
9	Apcl A&p Group Limited	Partial evidence	Hebburn, United KingdomHQ checked Sep 20, 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 20, 2026
10	Mactaggart Scott	Partial evidence	Loanhead, United KingdomHQ checked Sep 20, 2026	201-500	210 contacts →
	Partial evidence “A Scottish engineering company founded in 1898, MacTaggart Scott supports the Naval Defence and Marine market.” Source: RevenueBase Database · checked Sep 20, 2026
11	Ninety Percent Of Everything 90poe	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	161 contacts →
	Partial evidence “Creating clarity, control and confidence for modern maritime operations with OpenOcean STUDIO.” Source: RevenueBase Database · checked Sep 20, 2026
12	Subsea Craft Limited	Partial evidence	Portsmouth, United KingdomHQ checked Sep 20, 2026	51-200	159 contacts →
	Partial evidence “Based in Portsmouth, SSC’s mission is to provide maritime and amphibious forces with the operational advantage through the accelerated research, development and delivery of…” Source: RevenueBase Database · checked Sep 20, 2026
13	Ferguson Marine Port Glasgow Limited	Partial evidence	Port Glasgow, United KingdomHQ checked Sep 20, 2026	201-500	156 contacts →
	Partial evidence “Ferguson Marine (Port Glasgow) Limited is Scotland's leading company in new build, refit and ship repair.” Source: RevenueBase Database · checked Sep 20, 2026
14	Seatec	Indirect evidence	Glasgow, United KingdomHQ checked Sep 20, 2026	201-500	155 contacts →
	Indirect evidence “SeaTec provides a comprehensive range of services and products to meet the needs of the shipping, offshore and defence industries.” Source: RevenueBase Database · checked Sep 20, 2026
15	Orca AI	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	132 contacts →
	Partial evidence “Founded in 2018 by a team of Navy veterans, Orca AI, a maritime tech startup, empowers shipping companies to enhance their operational safety, efficiency, and sustainability…” Source: RevenueBase Database · checked Sep 20, 2026
16	SRT Marine Systems PLC	Partial evidence	Midsomer Norton, United KingdomHQ checked Sep 20, 2026	51-200	129 contacts →
	Partial 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 20, 2026
17	Spectec	Strong evidence	Manchester, United KingdomHQ checked Sep 20, 2026	51-200	113 contacts →
	Strong evidence “SpecTec is a market-leading maritime technology company specialising in asset management software.” Source: RevenueBase Database · checked Sep 20, 2026
18	James Fisher Offshore	Partial evidence	Oldmeldrum, United KingdomHQ checked Sep 20, 2026	51-200	107 contacts →
	Partial evidence “James Fisher Offshore (JFO) is an international supplier of marine back deck, specialist subsea equipment and engineering services supporting the global subsea contractors across…” Source: RevenueBase Database · checked Sep 20, 2026
19	Cathelco	Indirect evidence	Chesterfield, United KingdomHQ checked Sep 20, 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 20, 2026
20	SMS Group Ship Repair Marine Interiors Marine Engineering SC Sqep	Partial evidence	Southampton, United KingdomHQ checked Sep 20, 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 20, 2026
21	Shearwater Marine Services	Partial evidence	Sandbank, United KingdomHQ checked Sep 20, 2026	51-200	87 contacts →
	Partial evidence “Founded in 1992, Shearwater Marine Services have since grown to become a highly respected topside and sub-surface marine engineering service provider.” Source: RevenueBase Database · checked Sep 20, 2026
22	Seebyte	Partial evidence	Edinburgh, United KingdomHQ checked Sep 20, 2026	51-200	81 contacts →
	Partial 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 20, 2026
23	Ulysses Systems	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	78 contacts →
	Partial evidence “Ulysses Systems is a leading marine industry provider of enterprise software.” Source: RevenueBase Database · checked Sep 20, 2026
24	Kraken Technology Group	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	76 contacts →
	Partial evidence “High-performance dual-use composite littoral platforms for defence and commercial application in the maritime industry.” Source: RevenueBase Database · checked Sep 20, 2026
25	Holyhead Towing Co. LTD	Indirect evidence	Holyhead, United KingdomHQ checked Sep 20, 2026	51-200	75 contacts →
	Indirect evidence “Holyhead Towing Company (Est.” Source: RevenueBase Database · checked Sep 20, 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 technology companies. 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 technology companies.
Partial evidence: Its own public description names part of marine technology companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name marine technology companies. 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 490 marine technology companies based in the United Kingdom

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Marine technology companies based in the United Kingdom at a glance

As of Sep 20, 2026

36.0%Verified-email coverage

22.0Average contacts per company

1-10Median size (employees)

9.4%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

256

11-50

132

51-200

201-500

501-1,000

1,001-5,000

10001+

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 490 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 technology companies, 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 technology companies”. 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 technology companies), 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 technology 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 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, 3,884 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 20, 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 technology companies by metro

Marine technology companies in London46
Marine technology companies in Aberdeen26

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 technology companies, 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 technology companies are there based in the United Kingdom?

RevenueBase identified 490 marine technology 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?

Ocean Infinity, headquartered in London, tops this list with the largest team on record.

Which city has the most marine technology companies?

London leads with 46 headquartered companies, followed by Aberdeen (26) and Southampton (22).

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 3,884 verified decision-maker contacts tracked across these 490 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 20, 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.