Company lists · Data refreshed September 2026

Top 25 Offshore support vessels based in the United Kingdom

Name: Offshore support vessels 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 211 companies tracked

RevenueBase identified 211 offshore support vessels headquartered in the United Kingdom as of September 2026 and tracks 19,741 professional contacts across them, including 3,548 with verified work emails. London is the largest hub.

This list covers offshore support vessels 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

211Companies

19,741Contacts tracked

3,548Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest offshore support vessels based in the United Kingdom

Ranked by team size

Top 25 of 211 offshore support vessels 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 offshore support vessels: 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	Zodiac Maritime	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	5,001-10,000	1,701 contacts →
	Indirect evidence “Starting with a single ship, Zodiac Maritime has grown into one of the world's largest and most respected shipping companies.” Source: RevenueBase Database · checked Sep 20, 2026
2	Altera Infrastructure	Partial evidence	Aberdeenshire, United KingdomHQ checked Sep 20, 2026	501-1,000	955 contacts →
	Partial 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 20, 2026
3	Boskalis Subsea Services	Partial evidence	Aberdeen, United KingdomHQ checked Sep 20, 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 20, 2026
4	Briggs Marine	Strong evidence	Burntisland, United KingdomHQ checked Sep 20, 2026	501-1,000	387 contacts →
	Strong 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	Swire Energy Services	Partial evidence	Aberdeen, United KingdomHQ checked Sep 20, 2026	501-1,000	284 contacts →
	Partial evidence “Swire Energy Services is a global provider of services supporting the energy industry.” Source: RevenueBase Database · checked Sep 20, 2026
6	Cyan Sentinel Limited	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 20, 2026	51-200	249 contacts →
	Indirect evidence “An International Shipowning and Marine Investment Company.” Source: RevenueBase Database · checked Sep 20, 2026
7	James Fisher Fendercare	Indirect evidence	Norwich, United KingdomHQ checked Sep 20, 2026	1,001-5,000	204 contacts →
	Indirect evidence “Shaping the future of maritime.” Source: RevenueBase Database · checked Sep 20, 2026
8	Fletcher	Strong evidence	Portlethen, United KingdomHQ checked Sep 20, 2026	201-500	184 contacts →
	Strong evidence “Fletcher operate and manage a modern fleet of Offshore Platform Supply Vessels, employing over 300 people to support our operations.” Source: RevenueBase Database · checked Sep 20, 2026
9	Clarksons Port Services	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	139 contacts →
	Indirect evidence “Part of the Clarksons Group, the world’s leading provider of integrated shipping services.” Source: RevenueBase Database · checked Sep 20, 2026
10	Njord Offshore LTD	Indirect evidence	Tendring, United KingdomHQ checked Sep 20, 2026	11-50	137 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
11	NYK Group Europe LTD	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	10001+	117 contacts →
	Indirect evidence “Nippon Yusen Kabushiki Kaisha is one of the world's leading transportation companies.” Source: RevenueBase Database · checked Sep 20, 2026
12	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
13	Bibby Marine	Indirect evidence	Liverpool, United KingdomHQ checked Sep 20, 2026	51-200	72 contacts →
	Indirect evidence “Formerly Bibby Marine Services and Bibby Maritime.” Source: RevenueBase Database · checked Sep 20, 2026
14	Williams Shipping	Partial evidence	Southampton, United KingdomHQ checked Sep 20, 2026	51-200	67 contacts →
	Partial evidence “Founded in 1894, Williams Shipping is a fifth-generation family-owned business offering a broad range of marine and logistics services, including vessel charter, port services…” Source: RevenueBase Database · checked Sep 20, 2026
15	Purus HST	Partial evidence	Swansea, United KingdomHQ checked Sep 20, 2026	51-200	61 contacts →
	Partial evidence “Purus HST is a division of Purus, a world leader in providing energy customers with maritime services to the offshore wind and gas transport industries.” Source: RevenueBase Database · checked Sep 20, 2026
16	Maritime Craft Services Clyde Limited	Indirect evidence	Largs, United KingdomHQ checked Sep 20, 2026	51-200	59 contacts →
	Indirect evidence “Maritime Craft Services (clyde) Limited is a Maritime company located in Irvine Rd, Largs, United Kingdom.” Source: RevenueBase Database · checked Sep 20, 2026
17	First Marine Solutions	Partial evidence	Aberdeen, United KingdomHQ checked Sep 20, 2026	51-200	55 contacts →
	Partial evidence “First Marine Solutions is a leading international energy service and equipment organisation with operations worldwide, We provide expertise, technology, techniques and support…” Source: RevenueBase Database · checked Sep 20, 2026
18	Seacat Services LTD	Strong evidence	Cowes, United KingdomHQ checked Sep 20, 2026	51-200	55 contacts →
	Strong evidence “We are a class leading wind farm vessel support operator, operating internationally out of Cowes, UK, with a fleet of fourteen IACS classified multi-purpose offshore energy…” Source: RevenueBase Database · checked Sep 20, 2026
19	Tidal Transit Limited	Indirect evidence	Egmere, United KingdomHQ checked Sep 20, 2026	11-50	52 contacts →
	Indirect evidence “Tidal Transit Ltd, providing access, transport and crew transfer services to the industries of the North Sea.” Source: RevenueBase Database · checked Sep 20, 2026
20	Strachans LTD Trading AS Wrist Offshore	Partial evidence	Peterhead, United KingdomHQ checked Sep 20, 2026	51-200	50 contacts →
	Partial evidence “Strachans is the leading supplier of food & catering consumables to the Offshore Oil & Gas and Renewables sector offering our customers a single supply source for all products.” Source: RevenueBase Database · checked Sep 20, 2026
21	Inverlussa Marine Services	Partial evidence	Isle Of Mull, United KingdomHQ checked Sep 20, 2026	51-200	49 contacts →
	Partial evidence “Inverlussa is one of the leading workboat operators in the aquaculture industry in Scotland and has experience in the offshore renewables industry.” Source: RevenueBase Database · checked Sep 20, 2026
22	Spectrum	Strong evidence	Lymington, United KingdomHQ checked Sep 20, 2026	11-50	41 contacts →
	Strong evidence “Spectrum specialises in the provision of combined marine survey and crew transfer vessel services to the offshore construction industry.” Source: RevenueBase Database · checked Sep 20, 2026
23	HMM Europe LTD	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	40 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
24	Safests LTD	Indirect evidence	Diss, United KingdomHQ checked Sep 20, 2026	11-50	36 contacts →
	Indirect evidence “SafeSTS is a leading global provider of ship-to-ship (STS) transfer services, operating worldwide via our network of bases across 5 continents.” Source: RevenueBase Database · checked Sep 20, 2026
25	Leask Marine LTD	Partial evidence	Kirkwall, United KingdomHQ checked Sep 20, 2026	11-50	32 contacts →
	Partial evidence “Leask Marine provide an unprecedented range of uniquely developed processes and equipment to support the mobilisation, deployment, installation, commissioning, service and…” 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: offshore support vessels. 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 offshore support vessels.
Partial evidence: Its own public description names part of offshore support vessels, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name offshore support vessels. 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 211 offshore support vessels based in the United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 3,548 reachable decision-makers.

Free signup · no credit card

View the full list →

Offshore support vessels based in the United Kingdom at a glance

As of Sep 20, 2026

18.0%Verified-email coverage

93.6Average contacts per company

11-50Median size (employees)

16.6%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

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 211 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 offshore support vessels, 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 “offshore support vessels”. 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 offshore support vessels), 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 offshore support vessels, 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, 3,548 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.

Offshore support vessels by metro

Offshore support vessels in London35

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 offshore support vessels, 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 offshore support vessels are there based in the United Kingdom?

RevenueBase identified 211 offshore support vessels 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?

Zodiac Maritime, headquartered in London, tops this list with the largest team on record.

Which city has the most offshore support vessels?

London leads with 35 headquartered companies, followed by Aberdeen (20) and Lowestoft (5).

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 3,548 verified decision-maker contacts tracked across these 211 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.

Ready to reach these companies? Verified emails and direct dials for all 211 offshore support vessels based in the United Kingdom. Start with a free account, no credit card.

Download this list →

Related lists

Offshore support vessels by geography

Browse the directory

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.