Company lists · Data refreshed September 2026

Top 25 Offshore energy insurance providers based in the United Kingdom

Name: Offshore energy insurance providers 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 83 companies tracked

RevenueBase identified 83 offshore energy insurance providers headquartered in the United Kingdom as of September 2026 and tracks 3,488 professional contacts across them, including 1,455 with verified work emails. London is the largest hub.

This list covers offshore energy insurance providers 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

83Companies

3,488Contacts tracked

1,455Verified emails

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The 25 largest offshore energy insurance providers based in the United Kingdom

Ranked by team size

Top 25 of 83 offshore energy insurance providers 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 offshore energy insurance providers: 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	Strong evidence	Aberdeenshire, United KingdomHQ checked Sep 17, 2026	501-1,000	955 contacts →
	Strong 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	Acteon	Strong evidence	Norwich, United KingdomHQ checked Sep 17, 2026	1,001-5,000	192 contacts →
	Strong evidence “Acteon delivers data-driven, engineering-led solutions across the lifecycle of offshore energy infrastructure.” Source: RevenueBase Database · checked Sep 17, 2026
3	Imca International Marine Contractors Association	Strong evidence	London, United KingdomHQ checked Sep 17, 2026	11-50	134 contacts →
	Strong evidence “The International Marine Contractors Association (IMCA) is the global business association for construction and engineering companies working in offshore energy - both wind and…” Source: RevenueBase Database · checked Sep 17, 2026
4	Interocean Marine Services	Partial evidence	Portlethen, United KingdomHQ checked Sep 17, 2026	51-200	134 contacts →
	Partial 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
5	ADD Energy	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	201-500	107 contacts →
	Partial evidence “Add Energy's divisions have split and merged into two separate ABL Group companies.” Source: RevenueBase Database · checked Sep 17, 2026
6	Crondall Energy	Strong evidence	Southampton, United KingdomHQ checked Sep 17, 2026	11-50	50 contacts →
	Strong evidence “Crondall Energy is an independent offshore energy consultancy specialising in floating and subsea facilities.” Source: RevenueBase Database · checked Sep 17, 2026
7	Lochain Patrick Insurance Brokers	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	11-50	36 contacts →
	Partial evidence “Founded in 1987, Lochain Patrick, a division of Burns & Wilcox Global solutions, is a highly respected, expert and experienced leading firm of insurance brokers.” Source: RevenueBase Database · checked Sep 17, 2026
8	Aspect	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	11-50	28 contacts →
	Partial evidence “Re)insurance for tougher risks.” Source: RevenueBase Database · checked Sep 17, 2026
9	Amphitrite Underwriting Limited	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	11-50	21 contacts →
	Partial evidence “We are a specialist marine insurance underwriting agency located in the City of London, and market leaders for marine insurance products which provide innovative, bespoke and…” Source: RevenueBase Database · checked Sep 17, 2026
10	Pantaenius UK LTD	Partial evidence	Plymouth, United KingdomHQ checked Sep 17, 2026	11-50	18 contacts →
	Partial evidence “Pantaenius UK Ltd is a leading provider of sail and motor yacht insurance with offices in Plymouth and on the River Hamble in the United Kingdom.” Source: RevenueBase Database · checked Sep 17, 2026
11	GJW Direct	Partial evidence	Manchester, United KingdomHQ checked Sep 17, 2026	51-200	18 contacts →
	Partial evidence “Boat Insurance you can trust.” Source: RevenueBase Database · checked Sep 17, 2026
12	Roanoke International Brokers Limited	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	11-50	17 contacts →
	Indirect evidence “Roanoke International Brokers Limited (RIBL) is a vibrant broker situated within close proximity of Lloyd’s of London.” Source: RevenueBase Database · checked Sep 17, 2026
13	Seacroft Marine Consultants	Partial evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	11-50	15 contacts →
	Partial evidence “Seacroft Marine Consultants is a leading provider of marine assurance, offshore consultancy, and offshore marine safety services in the UK and worldwide.” Source: RevenueBase Database · checked Sep 17, 2026
14	Aquilano Insurance	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	11-50	15 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
15	Specialist Marine Consultants SMC	Partial evidence	Hunmanby Filey, United KingdomHQ checked Sep 17, 2026	201-500	13 contacts →
	Partial evidence “Specialist Marine Consultants (SMC), an OEG Group company is a global leader in providing Marine Coordination services to the renewable energy sector, as well as Statutory…” Source: RevenueBase Database · checked Sep 17, 2026
16	Volt UW	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	11-50	12 contacts →
	Partial evidence “London-based Volt Underwriting, a Lloyd’s Approved Coverholder, exists to support world-wide energy-sector clients through the transition.” Source: RevenueBase Database · checked Sep 17, 2026
17	The Insurance Broker LTD	Partial evidence	Longridge, United KingdomHQ checked Sep 17, 2026	1-10	11 contacts →
	Partial evidence “The Insurance Broker Ltd has been trading in Longridge, Lancashire since 2001 when it was founded by Mark O'Connell ACII and Rosemarie O'Connell BA Hons.” Source: RevenueBase Database · checked Sep 17, 2026
18	RYDER	Strong evidence	Newcastle Upon Tyne, United KingdomHQ checked Sep 17, 2026	11-50	10 contacts →
	Strong evidence “We are industry leaders in offshore energy consultancy, specialising in both the oil and gas sector and offshore wind markets, delivering tailored solutions and unparalleled…” Source: RevenueBase Database · checked Sep 17, 2026
19	SEA Source Offshore	Strong evidence	Kilkeel, United KingdomHQ checked Sep 17, 2026	1-10	9 contacts →
	Strong evidence “Sea Source Offshore was founded to offer our members the opportunity to diversify their maritime skills and assets into offshore energy related activities.” Source: RevenueBase Database · checked Sep 17, 2026
20	Abbott & Bramwell LTD	Partial evidence	Stockport, United KingdomHQ checked Sep 17, 2026	11-50	9 contacts →
	Partial evidence “Formed in 1990, A&B Insurance Group have grown through strategic development, into a leading provider of insurance and risk management services to the Corporate and Marine sectors.” Source: RevenueBase Database · checked Sep 17, 2026
21	Iknowa	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	1-10	9 contacts →
	Partial evidence “iknowa is the fully-regulated partner the construction sector trusts to deliver market-leading insurance and risk infrastructure.” Source: RevenueBase Database · checked Sep 17, 2026
22	Clearwater UW Limited	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	1-10	8 contacts →
	Partial evidence “Clearwater UW Limited offers flexible insurance solutions to the maritime industry.” Source: RevenueBase Database · checked Sep 17, 2026
23	HIA Energy	Strong evidence	London, United KingdomHQ checked Sep 17, 2026	11-50	8 contacts →
	Strong evidence “HIA Energy delivers premium offshore survey solutions, project delivery, and specialist personnel to the global energy and marine sectors.” Source: RevenueBase Database · checked Sep 17, 2026
24	Stoneways Marine	Partial evidence	Newbury, United KingdomHQ checked Sep 17, 2026	1-10	6 contacts →
	Partial evidence “We provide insurance for the marine industry.” Source: RevenueBase Database · checked Sep 17, 2026
25	Platinum Underwriting LTD	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	1-10	6 contacts →
	Partial evidence “PLATINUM UNDERWRITING LTD is an insurance company based out of United Kingdom.” 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: offshore energy insurance providers. 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 energy insurance providers.
Partial evidence: Its own public description names part of offshore energy insurance providers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name offshore energy insurance providers. 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 83 offshore energy insurance providers based in the United Kingdom

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Offshore energy insurance providers based in the United Kingdom at a glance

As of Sep 17, 2026

41.7%Verified-email coverage

42.0Average contacts per company

1-10Median size (employees)

43.4%Largest-city concentration · London

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

11-50

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 83 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 energy insurance providers, 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 energy insurance providers”. 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 energy insurance providers), 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 energy insurance providers, 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, 1,455 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.

Offshore energy insurance providers by metro

Offshore energy insurance providers in London36

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 energy insurance providers, 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 energy insurance providers are there based in the United Kingdom?

RevenueBase identified 83 offshore energy insurance providers 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 offshore energy insurance providers?

London leads with 36 headquartered companies, followed by Norwich (4) and Aberdeen (3).

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 1,455 verified decision-maker contacts tracked across these 83 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.