Company lists · Data refreshed September 2026

Top 25 Subsea installation contractors based in the United Kingdom

Name: Subsea installation contractors based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 18, 2026 328 companies tracked

RevenueBase identified 328 subsea installation contractors headquartered in the United Kingdom as of September 2026 and tracks 10,797 professional contacts across them, including 3,579 with verified work emails. Aberdeen is the largest hub.

This list covers subsea installation contractors 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 18, 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 18, 2026 86% judged on-target in blind review

328Companies

10,797Contacts tracked

3,579Verified emails

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The 25 largest subsea installation contractors based in the United Kingdom

Ranked by team size

Top 25 of 328 subsea installation contractors based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 18, 2026. RevenueBase Smart Search rates how each company's information relates to subsea installation contractors: 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	Altera Infrastructure	Indirect evidence	Aberdeenshire, United KingdomHQ checked Sep 18, 2026	501-1,000	955 contacts →
	Indirect evidence “Altera Infrastructure is a leading global energy infrastructure services group focused on the ownership and operation of offshore energy assets.” Source: RevenueBase Database · checked Sep 18, 2026
2	Altrad Sparrows	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 18, 2026	1,001-5,000	547 contacts →
	Indirect evidence “Altrad Sparrows is a global provider of specialist equipment and integrated engineering services to the energy and industrial sectors.” Source: RevenueBase Database · checked Sep 18, 2026
3	Boskalis Subsea Services	Partial evidence	Aberdeen, United KingdomHQ checked Sep 18, 2026	201-500	516 contacts →
	Partial 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 18, 2026
4	Global Marine	Strong evidence	Chelmsford, United KingdomHQ checked Sep 18, 2026	501-1,000	339 contacts →
	Strong evidence “Global Marine is part of the Global Marine Group, and is a market leader in subsea cable installation and maintenance solutions to the telecoms and oil & gas sectors.” Source: RevenueBase Database · checked Sep 18, 2026
5	SMD	Partial evidence	Wallsend, United KingdomHQ checked Sep 18, 2026	51-200	292 contacts →
	Partial evidence “SMD is an advanced global designer and manufacturer of subsea remotely operated and autonomous power and control solutions.” Source: RevenueBase Database · checked Sep 18, 2026
6	Acteon	Indirect evidence	Norwich, United KingdomHQ checked Sep 18, 2026	1,001-5,000	192 contacts →
	Indirect evidence “Acteon delivers data-driven, engineering-led solutions across the lifecycle of offshore energy infrastructure.” Source: RevenueBase Database · checked Sep 18, 2026
7	OSBIT	Indirect evidence	Northumberland, United KingdomHQ checked Sep 18, 2026	201-500	171 contacts →
	Indirect evidence “Osbit’s vision is to unlock a clean energy future by creating smarter technology.” Source: RevenueBase Database · checked Sep 18, 2026
8	Aquaterra Energy	Indirect evidence	Norwich, United KingdomHQ checked Sep 18, 2026	51-200	167 contacts →
	Indirect evidence “Aquaterra Energy provides intelligently engineered products and services for well access and offshore developments - supporting efficient operations across the full life cycle of…” Source: RevenueBase Database · checked Sep 18, 2026
9	Enshore Subsea	Partial evidence	Blyth, United KingdomHQ checked Sep 18, 2026	51-200	161 contacts →
	Partial evidence “The globally trusted delivery experts in installing and protecting critical subsea infrastructure.” Source: RevenueBase Database · checked Sep 18, 2026
10	Seatrium Offshore Renewable Services LTD	Indirect evidence	Lowestoft, United KingdomHQ checked Sep 18, 2026	n/a	155 contacts →
	Indirect evidence “Seatrium Offshore Renewable Services Ltd (Seatrium ORS) has over 55 years of unparalleled expertise and experience in the offshore energy industry.” Source: RevenueBase Database · checked Sep 18, 2026
11	Maritime Developments Limited	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 18, 2026	51-200	148 contacts →
	Indirect evidence “MDL - We Build Innovation.” Source: RevenueBase Database · checked Sep 18, 2026
12	Interocean Marine Services	Indirect evidence	Portlethen, United KingdomHQ checked Sep 18, 2026	51-200	134 contacts →
	Indirect evidence “Interocean provide a comprehensive range of services to the offshore oil and gas, marine, and renewable sectors.” Source: RevenueBase Database · checked Sep 18, 2026
13	Aquaterra Group LTD	Indirect evidence	Kintore, United KingdomHQ checked Sep 18, 2026	11-50	123 contacts →
	Indirect evidence “RELIABLE \| RESOURCEFUL \| READY We continually raise the bar by challenging ourselves and our clients to enable safe and efficient performance.” Source: RevenueBase Database · checked Sep 18, 2026
14	Derrick Services UK LTD	Indirect evidence	Great Yarmouth, United KingdomHQ checked Sep 18, 2026	51-200	111 contacts →
	Indirect evidence “Derrick Service UK Ltd (DSL) is a diversified oil & gas construction company which provides a broad range of products and services to the market from our Worldwide locations.” Source: RevenueBase Database · checked Sep 18, 2026
15	James Fisher Offshore	Strong evidence	Oldmeldrum, United KingdomHQ checked Sep 18, 2026	51-200	107 contacts →
	Strong 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 18, 2026
16	Andrews Survey	Partial evidence	Aberdeen, United KingdomHQ checked Sep 18, 2026	51-200	88 contacts →
	Partial evidence “Andrews Survey is predominantly active in construction and trenching support, ROV pipeline inspection support, renewable energy and wind-farm installation support and rig…” Source: RevenueBase Database · checked Sep 18, 2026
17	Shearwater Marine Services	Indirect evidence	Sandbank, United KingdomHQ checked Sep 18, 2026	51-200	87 contacts →
	Indirect 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 18, 2026
18	Foundocean	Indirect evidence	Livingston, United KingdomHQ checked Sep 18, 2026	51-200	85 contacts →
	Indirect evidence “FoundOcean boasts 60 years’ experience of providing green and brown field services to the marine construction industries.” Source: RevenueBase Database · checked Sep 18, 2026
19	Copius Group	Indirect evidence	Newtownabbey, United KingdomHQ checked Sep 18, 2026	201-500	81 contacts →
	Indirect evidence “Copius Group is a premier provider of construction and engineering services, delivering comprehensive solutions for offshore and onshore projects across the globe.” Source: RevenueBase Database · checked Sep 18, 2026
20	JEE	Partial evidence	Tonbridge, United KingdomHQ checked Sep 18, 2026	51-200	77 contacts →
	Partial evidence “Jee is a leading independent multi-discipline subsea engineering and training company, delivering integrated services to the oil, gas and renewables industries.” Source: RevenueBase Database · checked Sep 18, 2026
21	Hydro Group Ltd, Connected By Trexon	Partial evidence	Aberdeen, United KingdomHQ checked Sep 18, 2026	51-200	71 contacts →
	Partial evidence “With over 40 years of experience, at Hydro Group we specialise in the manufacture of bespoke subsea cable and connector assembly engineering for some of the most demanding…” Source: RevenueBase Database · checked Sep 18, 2026
22	Global Marine Group	Partial evidence	Chelmsford, United KingdomHQ checked Sep 18, 2026	51-200	70 contacts →
	Partial evidence “The Global Marine Group is a leading independent provider of submarine cable solutions offering a broad range of services including consultancy, installation and maintenance…” Source: RevenueBase Database · checked Sep 18, 2026
23	Film-Ocean	Partial evidence	Ellon, United KingdomHQ checked Sep 18, 2026	51-200	68 contacts →
	Partial evidence “Film-Ocean provides innovative subsea solutions to the global offshore energy industry.” Source: RevenueBase Database · checked Sep 18, 2026
24	TMS LTD	Partial evidence	Devon, United KingdomHQ checked Sep 18, 2026	51-200	65 contacts →
	Partial evidence “TMS Ltd have in excess of 31 years of expertise as a marine contractor within the Civil Engineering sector.” Source: RevenueBase Database · checked Sep 18, 2026
25	Offshore Marine Management Holdings LTD	Partial evidence	Bristol, United KingdomHQ checked Sep 18, 2026	11-50	60 contacts →
	Partial evidence “Offshore Marine Management Holdings is a leading group of companies specialising in the delivery of subsea solutions to the offshore renewables, grid, telecommunications and oil &…” Source: RevenueBase Database · checked Sep 18, 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: subsea installation contractors. 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 subsea installation contractors.
Partial evidence: Its own public description names part of subsea installation contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name subsea installation contractors. 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 328 subsea installation contractors based in the United Kingdom

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Subsea installation contractors based in the United Kingdom at a glance

As of Sep 18, 2026

33.1%Verified-email coverage

32.9Average contacts per company

11-50Median size (employees)

19.8%Largest-city concentration · Aberdeen

Sep 18, 2026Page data refreshed

Companies by employee count

1-10

145

11-50

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 328 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 subsea installation contractors, 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 “subsea installation contractors”. 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 subsea installation contractors), 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 subsea installation contractors, 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, 3,579 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 18, 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.

Subsea installation contractors by metro

Subsea installation contractors in Aberdeen65

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 subsea installation contractors, 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 subsea installation contractors are there based in the United Kingdom?

RevenueBase identified 328 subsea installation contractors 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?

Altera Infrastructure, headquartered in Prospect Park, tops this list with the largest team on record.

Which city has the most subsea installation contractors?

Aberdeen leads with 65 headquartered companies, followed by London (15) and Bridge Of Don (6).

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 3,579 verified decision-maker contacts tracked across these 328 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 18, 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.