Company lists · Data refreshed September 2026

Top 25 Ocean engineering firms based in the United Kingdom

Name: Ocean engineering 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 17, 2026 499 companies tracked

RevenueBase identified 499 ocean engineering firms headquartered in the United Kingdom as of September 2026 and tracks 19,990 professional contacts across them, including 6,146 with verified work emails. Aberdeen is the largest hub.

This list covers ocean engineering 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 17, 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 17, 2026 86% judged on-target in blind review

499Companies

19,990Contacts tracked

6,146Verified emails

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The 25 largest ocean engineering firms based in the United Kingdom

Ranked by team size

Top 25 of 499 ocean engineering firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to ocean engineering 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	Altera Infrastructure	Indirect evidence	Aberdeenshire, United KingdomHQ checked Sep 17, 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 17, 2026
2	ABL	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	1,001-5,000	804 contacts →
	Indirect evidence “The Energy and Marine Consultants - an Aqualis company.” Source: RevenueBase Database · checked Sep 17, 2026
3	Dolphin Drilling	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	201-500	694 contacts →
	Indirect evidence “Dolphin Drilling is the offshore drilling pioneer of the past and for the future.” Source: RevenueBase Database · checked Sep 17, 2026
4	Pd&ms Group	Partial evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	501-1,000	653 contacts →
	Partial evidence “PD & MS Group has full multi-discipline in-house EPCC capability and is recognised as a provider of safe, effective, and cost efficient design and engineering services to onshore…” Source: RevenueBase Database · checked Sep 17, 2026
5	Gardline Limited	Indirect evidence	Great Yarmouth, United KingdomHQ checked Sep 17, 2026	501-1,000	545 contacts →
	Indirect evidence “Gardline is a best-in-class provider of geophysical, geotechnical and environmental marine surveys.” Source: RevenueBase Database · checked Sep 17, 2026
6	Boskalis Subsea Services	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 17, 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 17, 2026
7	James Fisher And Sons PLC	Partial evidence	Barrow-in-furness, United KingdomHQ checked Sep 17, 2026	1,001-5,000	403 contacts →
	Partial evidence “Above, below and beyond the world’s oceans.” Source: RevenueBase Database · checked Sep 17, 2026
8	SMD	Indirect evidence	Wallsend, United KingdomHQ checked Sep 17, 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 17, 2026
9	2h Offshore	Partial evidence	Woking, United KingdomHQ checked Sep 17, 2026	201-500	286 contacts →
	Partial evidence “2H Offshore delivers leading-edge advanced systems engineering for all types of offshore structures in the oil and gas and renewable energy sectors.” Source: RevenueBase Database · checked Sep 17, 2026
10	Motive Offshore Group LTD	Indirect evidence	Banff, United KingdomHQ checked Sep 17, 2026	201-500	283 contacts →
	Indirect evidence “Motive Offshore Group specialises in the design, manufacture, rental, and inspection of marine and lifting equipment.” Source: RevenueBase Database · checked Sep 17, 2026
11	Claxton Engineering Services	Indirect evidence	Great Yarmouth, United KingdomHQ checked Sep 17, 2026	201-500	279 contacts →
	Indirect evidence “Claxton, an AF Gruppen Company, combines decades of industry experience, proprietary technology, and exceptional service quality to cut through offshore installation and…” Source: RevenueBase Database · checked Sep 17, 2026
12	Ledwood Mechanical Engineering LTD	Partial evidence	Pembrokeshire, United KingdomHQ checked Sep 17, 2026	501-1,000	266 contacts →
	Partial evidence “Ledwood is an independent engineering, fabrication and construction company specialising in the delivery of complex projects across the oil, gas, process and energy industries.” Source: RevenueBase Database · checked Sep 17, 2026
13	Cyan Sentinel Limited	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	51-200	249 contacts →
	Indirect evidence “An International Shipowning and Marine Investment Company.” Source: RevenueBase Database · checked Sep 17, 2026
14	TEXO	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	51-200	222 contacts →
	Indirect evidence “TEXO is a dynamic, UK-based industrial services provider that believes in meeting challenges head on.” Source: RevenueBase Database · checked Sep 17, 2026
15	Acteon	Partial evidence	Norwich, United KingdomHQ checked Sep 17, 2026	1,001-5,000	192 contacts →
	Partial evidence “Acteon delivers data-driven, engineering-led solutions across the lifecycle of offshore energy infrastructure.” Source: RevenueBase Database · checked Sep 17, 2026
16	Wilton Engineering	Partial evidence	Middlesbrough, United KingdomHQ checked Sep 17, 2026	201-500	188 contacts →
	Partial evidence “Wilton Engineering is a multi-disciplined Engineering Services provider based on a 113 acre site by the River Tees in Middlesbrough, North-East England.” Source: RevenueBase Database · checked Sep 17, 2026
17	OSBIT	Indirect evidence	Northumberland, United KingdomHQ checked Sep 17, 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 17, 2026
18	Aquaterra Energy	Indirect evidence	Norwich, United KingdomHQ checked Sep 17, 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 17, 2026
19	Eastgate Engineering	Partial evidence	Thornaby-on-tees, United KingdomHQ checked Sep 17, 2026	201-500	163 contacts →
	Partial evidence “Eastgate Engineering is an Electrical and Instrumentation contractor that delivers complex, high-risk infrastructure projects with cost certainty, without compromising safety or…” Source: RevenueBase Database · checked Sep 17, 2026
20	Enshore Subsea	Indirect evidence	Blyth, United KingdomHQ checked Sep 17, 2026	51-200	161 contacts →
	Indirect evidence “The globally trusted delivery experts in installing and protecting critical subsea infrastructure.” Source: RevenueBase Database · checked Sep 17, 2026
21	Ferguson Marine Port Glasgow Limited	Indirect evidence	Port Glasgow, United KingdomHQ checked Sep 17, 2026	201-500	156 contacts →
	Indirect evidence “Ferguson Marine (Port Glasgow) Limited is Scotland's leading company in new build, refit and ship repair.” Source: RevenueBase Database · checked Sep 17, 2026
22	Seatrium Offshore Renewable Services LTD	Indirect evidence	Lowestoft, United KingdomHQ checked Sep 17, 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 17, 2026
23	Maritime Developments Limited	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	51-200	148 contacts →
	Indirect evidence “MDL - We Build Innovation.” Source: RevenueBase Database · checked Sep 17, 2026
24	Longitude Engineering	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	51-200	138 contacts →
	Partial evidence “The Engineering Consultants.” Source: RevenueBase Database · checked Sep 17, 2026
25	Interocean Marine Services	Indirect evidence	Portlethen, United KingdomHQ checked Sep 17, 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 17, 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: ocean engineering 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 ocean engineering firms.
Partial evidence: Its own public description names part of ocean engineering firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name ocean engineering 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 499 ocean engineering firms based in the United Kingdom

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Ocean engineering firms based in the United Kingdom at a glance

As of Sep 17, 2026

30.7%Verified-email coverage

40.1Average contacts per company

1-10Median size (employees)

14.0%Largest-city concentration · Aberdeen

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

249

11-50

130

51-200

201-500

501-1,000

1,001-5,000

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 499 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 ocean engineering 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 “ocean engineering 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 ocean engineering 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 ocean engineering 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, 6,146 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 17, 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.

Ocean engineering firms by metro

Ocean engineering firms in Aberdeen70
Ocean engineering firms in London54

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 ocean engineering 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 ocean engineering firms are there based in the United Kingdom?

RevenueBase identified 499 ocean engineering 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?

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

Which city has the most ocean engineering firms?

Aberdeen leads with 70 headquartered companies, followed by London (54) and Glasgow (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 6,146 verified decision-maker contacts tracked across these 499 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 17, 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.