Company lists · Data refreshed September 2026

Top 25 Marine and aviation reinsurers based in the United Kingdom

Name: Marine and aviation reinsurers 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 238 companies tracked

RevenueBase identified 238 marine and aviation reinsurers headquartered in the United Kingdom as of September 2026 and tracks 22,685 professional contacts across them, including 10,846 with verified work emails. London is the largest hub.

This list covers marine and aviation reinsurers 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

238Companies

22,685Contacts tracked

10,846Verified emails

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The 25 largest marine and aviation reinsurers based in the United Kingdom

Ranked by team size

Top 25 of 238 marine and aviation reinsurers 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 marine and aviation reinsurers: 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	Beazley	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	1,001-5,000	2,564 contacts →
	Indirect evidence “We are a specialty insurer with more than three decades of experience in providing clients with the highest standards of underwriting and claims service worldwide.” Source: RevenueBase Database · checked Sep 17, 2026
2	QBE Europe	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	1,001-5,000	1,343 contacts →
	Indirect evidence “At QBE we’re driven by our purpose of enabling a more resilient future.” Source: RevenueBase Database · checked Sep 17, 2026
3	MS Amlin	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	1,001-5,000	1,201 contacts →
	Partial evidence “We are a specialist insurer and reinsurer with a 100-year record of helping clients navigate the world’s most complex and demanding risks.” Source: RevenueBase Database · checked Sep 17, 2026
4	Miller Insurance Services LLP	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	1,001-5,000	1,040 contacts →
	Indirect evidence “Our reputation as the finest advocates in the business comes from our exceptional people delivering exceptional results for over 120 years.” Source: RevenueBase Database · checked Sep 17, 2026
5	Markel International	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	1,001-5,000	926 contacts →
	Indirect evidence “As the insurance operations within the Markel Group Inc.(NYSE: MKL), we operate the Markel Specialty, Markel International, and Markel Global Reinsurance divisions, as well as…” Source: RevenueBase Database · checked Sep 17, 2026
6	Canopius Group	Indirect evidence	22 Bishopsgate, United KingdomHQ checked Sep 17, 2026	501-1,000	853 contacts →
	Indirect evidence “We are Canopius, a global specialty and Property & Casualty (re)insurer with offices in the UK, the US, Bermuda, Singapore and Australia.” Source: RevenueBase Database · checked Sep 17, 2026
7	Howden RE	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	1,001-5,000	752 contacts →
	Indirect evidence “The global reinsurance broker and risk, capital, and strategic advisor focused on relentless innovation and superior analytics for top client service.” Source: RevenueBase Database · checked Sep 17, 2026
8	Chaucer Group	Indirect evidence	City Of London, United KingdomHQ checked Sep 17, 2026	501-1,000	694 contacts →
	Indirect evidence “Chaucer are a leading specialty (re)insurance group working with brokers, coverholders and clients to protect and support business activities around the world.” Source: RevenueBase Database · checked Sep 17, 2026
9	CNA Hardy	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	501-1,000	553 contacts →
	Indirect evidence “CNA Hardy is a leading specialist commercial insurance provider for clients within the Lloyd’s and company markets.” Source: RevenueBase Database · checked Sep 17, 2026
10	Amwins Global Risks	Indirect evidence	City Of London, United KingdomHQ checked Sep 17, 2026	501-1,000	484 contacts →
	Indirect evidence “As a global specialty insurance broker, Amwins Global Risks – formerly THB – delivers insurance and reinsurance coverage to clients around the world.” Source: RevenueBase Database · checked Sep 17, 2026
11	Tokio Marine HCC International	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	1,001-5,000	463 contacts →
	Partial evidence “Tokio Marine HCC is a leading specialty insurance group conducting business in approximately 180 countries and underwriting more than 100 classes of specialty insurance.” Source: RevenueBase Database · checked Sep 17, 2026
12	SSY	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	501-1,000	449 contacts →
	Indirect evidence “At SSY, we believe that experience matters.” Source: RevenueBase Database · checked Sep 17, 2026
13	Acrisure RE	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	201-500	385 contacts →
	Indirect evidence “Acrisure Re is a leading re/insurance intermediary and corporate advisor, offering bespoke and innovative capital, risk and program solutions to clients across the global…” Source: RevenueBase Database · checked Sep 17, 2026
14	Talbot Underwriting	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	201-500	370 contacts →
	Partial evidence “Talbot Underwriting Ltd (“Talbot”) is an international insurer and reinsurer operating within the Lloyd’s market through Syndicates 1183 and 2019.” Source: RevenueBase Database · checked Sep 17, 2026
15	IQUW	Indirect evidence	City Of London, United KingdomHQ checked Sep 17, 2026	201-500	346 contacts →
	Indirect evidence “IQUW is now Starr.” Source: RevenueBase Database · checked Sep 17, 2026
16	Global Aerospace	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	201-500	330 contacts →
	Partial evidence “Global Aerospace has over a century of experience and a powerful passion for providing aviation insurance solutions that protect industry stakeholders and empower the industry to…” Source: RevenueBase Database · checked Sep 17, 2026
17	Arch Insurance UK Limited	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	201-500	330 contacts →
	Indirect evidence “At Arch Insurance, we trade how you want to trade.” Source: RevenueBase Database · checked Sep 17, 2026
18	Antares	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	201-500	323 contacts →
	Indirect evidence “Antares provides local and international insurance and reinsurance capacity, risks transfer solutions and products through our Lloyd’s and company market platforms operating from…” Source: RevenueBase Database · checked Sep 17, 2026
19	INIGO	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	201-500	257 contacts →
	Indirect evidence “In an industry often shaped by legacy and complexity, Inigo was built to be different.” Source: RevenueBase Database · checked Sep 17, 2026
20	Atrium	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	201-500	234 contacts →
	Indirect evidence “Atrium is a leading (re)insurance group at Lloyd's, the world's specialist insurance market.” Source: RevenueBase Database · checked Sep 17, 2026
21	United Insurance Brokers Limited	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	51-200	229 contacts →
	Indirect evidence “United Insurance Brokers Limited (UIBL) is an integral part of one of the largest privately-owned independent international insurance and reinsurance brokers headquartered in…” Source: RevenueBase Database · checked Sep 17, 2026
22	Newline Group	Indirect evidence	London Ec3m 5bn, United KingdomHQ checked Sep 17, 2026	201-500	215 contacts →
	Indirect evidence “Newline Group is a market leading specialty insurance group that operates through three underwriting platforms: Newline Syndicate 1218 at Lloyd’s, Newline Insurance Company…” Source: RevenueBase Database · checked Sep 17, 2026
23	Rokstone Underwriting	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	51-200	180 contacts →
	Indirect evidence “Rokstone is one of the world’s largest MGAs, with offices in the UK, Europe, USA, Asia, Africa and the Middle East.” Source: RevenueBase Database · checked Sep 17, 2026
24	Munich RE Specialty	Indirect evidence	Manchester, United KingdomHQ checked Sep 17, 2026	51-200	180 contacts →
	Indirect evidence “Munich Re Specialty combines premier specialty expertise, capabilities, and products to offer partners and customers simplified access to a wide range of specialty insurance…” Source: RevenueBase Database · checked Sep 17, 2026
25	QBE RE	Partial evidence	City Of London, United KingdomHQ checked Sep 17, 2026	51-200	177 contacts →
	Partial evidence “QBE Re is the reinsurance division of the QBE Insurance Group, one of the world's leading international insurers and reinsurers.” 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: marine and aviation reinsurers. 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 and aviation reinsurers.
Partial evidence: Its own public description names part of marine and aviation reinsurers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name marine and aviation reinsurers. 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 238 marine and aviation reinsurers based in the United Kingdom

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Marine and aviation reinsurers based in the United Kingdom at a glance

As of Sep 17, 2026

47.8%Verified-email coverage

95.3Average contacts per company

11-50Median size (employees)

65.1%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

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 238 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 and aviation reinsurers, 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 and aviation reinsurers”. 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 and aviation reinsurers), 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 and aviation reinsurers, 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, 10,846 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.

Marine and aviation reinsurers by metro

Marine and aviation reinsurers in London155

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 and aviation reinsurers, 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 and aviation reinsurers are there based in the United Kingdom?

RevenueBase identified 238 marine and aviation reinsurers 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?

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

Which city has the most marine and aviation reinsurers?

London leads with 155 headquartered companies, followed by City Of London (10) and Manchester (4).

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 10,846 verified decision-maker contacts tracked across these 238 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.