Company lists · Data refreshed September 2026

Top 25 Reinsurance underwriting companies based in the United Kingdom

Name: Reinsurance underwriting companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 207 companies tracked

RevenueBase identified 207 reinsurance underwriting companies headquartered in the United Kingdom as of September 2026 and tracks 29,337 professional contacts across them, including 13,784 with verified work emails. London is the largest hub.

This list covers reinsurance underwriting companies 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 16, 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 16, 2026 86% judged on-target in blind review

207Companies

29,337Contacts tracked

13,784Verified emails

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The 25 largest reinsurance underwriting companies based in the United Kingdom

Ranked by team size

Top 25 of 207 reinsurance underwriting companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to reinsurance underwriting companies: 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	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	1,001-5,000	2,564 contacts →
	Partial 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 16, 2026
2	Gallagher RE	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	1,001-5,000	2,463 contacts →
	Partial evidence “Gallagher Re is one of the largest global reinsurance brokers, helping clients access the capital they need with strategic solutions built for volatile markets.” Source: RevenueBase Database · checked Sep 16, 2026
3	QBE Europe	Indirect evidence	London, United KingdomHQ checked Sep 16, 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 16, 2026
4	BMS Group	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	1,001-5,000	1,273 contacts →
	Partial evidence “For over four decades, BMS has transformed risk into progress, earning our place as one of the world’s leading insurance and reinsurance brokers.” Source: RevenueBase Database · checked Sep 16, 2026
5	MS Amlin	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	1,001-5,000	1,201 contacts →
	Indirect 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 16, 2026
6	Markel International	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	1,001-5,000	926 contacts →
	Partial 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 16, 2026
7	Price Forbes	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	1,001-5,000	918 contacts →
	Indirect evidence “Our history has made us.” Source: RevenueBase Database · checked Sep 16, 2026
8	Canopius Group	Indirect evidence	22 Bishopsgate, United KingdomHQ checked Sep 16, 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 16, 2026
9	Brit Insurance	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	501-1,000	844 contacts →
	Indirect evidence “If the future was predictable, there would be no risk and if change was linear, there’d be no need for experts.” Source: RevenueBase Database · checked Sep 16, 2026
10	Howden RE	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	1,001-5,000	752 contacts →
	Partial 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 16, 2026
11	Chaucer Group	Indirect evidence	City Of London, United KingdomHQ checked Sep 16, 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 16, 2026
12	Brown & Brown UK	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	1,001-5,000	690 contacts →
	Indirect evidence “No matter where you are on your growth journey, we can help you find solutions to meet your ever-evolving insurance and risk management needs.” Source: RevenueBase Database · checked Sep 16, 2026
13	Tokio Marine Kiln	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	501-1,000	677 contacts →
	Partial evidence “Tokio Marine Kiln is a leading international insurer with a reputation for specialist underwriting excellence, great people and innovative products.” Source: RevenueBase Database · checked Sep 16, 2026
14	Mcgill And Partners	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	201-500	566 contacts →
	Indirect evidence “Complex risk.” Source: RevenueBase Database · checked Sep 16, 2026
15	Amwins Global Risks	Partial evidence	City Of London, United KingdomHQ checked Sep 16, 2026	501-1,000	484 contacts →
	Partial 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 16, 2026
16	Tokio Marine HCC International	Partial evidence	London, United KingdomHQ checked Sep 16, 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 16, 2026
17	Acrisure RE	Indirect evidence	London, United KingdomHQ checked Sep 16, 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 16, 2026
18	Talbot Underwriting	Partial evidence	London, United KingdomHQ checked Sep 16, 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 16, 2026
19	IQUW	Indirect evidence	City Of London, United KingdomHQ checked Sep 16, 2026	201-500	346 contacts →
	Indirect evidence “IQUW is now Starr.” Source: RevenueBase Database · checked Sep 16, 2026
20	Riverstone International	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	201-500	326 contacts →
	Indirect evidence “RiverStone International is an industry-leading acquirer and reinsurer of legacy and discontinued insurance business.” Source: RevenueBase Database · checked Sep 16, 2026
21	Antares	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	201-500	323 contacts →
	Partial 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 16, 2026
22	Apollo	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	201-500	268 contacts →
	Indirect evidence “Apollo was launched in 2009 to provide clients and brokers with an agile and entrepreneurial insurance partner.” Source: RevenueBase Database · checked Sep 16, 2026
23	INIGO	Indirect evidence	London, United KingdomHQ checked Sep 16, 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 16, 2026
24	Specialist Risk Group	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	1,001-5,000	249 contacts →
	Indirect evidence “Specialist Risk Group (SRG) brings together individuals and businesses from across the world, who are united in our pursuit of specialism.” Source: RevenueBase Database · checked Sep 16, 2026
25	Atrium	Indirect evidence	London, United KingdomHQ checked Sep 16, 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 16, 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: reinsurance underwriting companies. 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 reinsurance underwriting companies.
Partial evidence: Its own public description names part of reinsurance underwriting companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name reinsurance underwriting companies. 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 207 reinsurance underwriting companies based in the United Kingdom

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Reinsurance underwriting companies based in the United Kingdom at a glance

As of Sep 16, 2026

47.0%Verified-email coverage

141.7Average contacts per company

11-50Median size (employees)

68.6%Largest-city concentration · London

Sep 16, 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 207 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 reinsurance underwriting companies, 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 “reinsurance underwriting companies”. 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 reinsurance underwriting companies), 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 reinsurance underwriting companies, 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, 13,784 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 16, 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.

Reinsurance underwriting companies by metro

Reinsurance underwriting companies in London142

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 reinsurance underwriting companies, 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 reinsurance underwriting companies are there based in the United Kingdom?

RevenueBase identified 207 reinsurance underwriting companies 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 reinsurance underwriting companies?

London leads with 142 headquartered companies, followed by City Of London (8) and Manchester (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 13,784 verified decision-maker contacts tracked across these 207 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 16, 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.