Company lists · Data refreshed September 2026

Top 25 Specialty insurance underwriting firms based in the United Kingdom

Name: Specialty insurance underwriting 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 18, 2026 402 companies tracked

RevenueBase identified 402 specialty insurance underwriting firms headquartered in the United Kingdom as of September 2026 and tracks 22,991 professional contacts across them, including 11,568 with verified work emails. London is the largest hub.

This list covers specialty insurance underwriting 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 18, 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 18, 2026 86% judged on-target in blind review

402Companies

22,991Contacts tracked

11,568Verified emails

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The 25 largest specialty insurance underwriting firms based in the United Kingdom

Ranked by team size

Top 25 of 402 specialty insurance underwriting firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 18, 2026. RevenueBase Smart Search rates how each company's information relates to specialty insurance underwriting 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	Beazley	Strong evidence	London, United KingdomHQ checked Sep 18, 2026	1,001-5,000	2,564 contacts →
	Strong 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 18, 2026
2	Markerstudy Group	Partial evidence	Sevenoaks, United KingdomHQ checked Sep 18, 2026	1,001-5,000	1,413 contacts →
	Partial evidence “Markerstudy Insurance Services Limited (MISL) is one of the largest Managing General Agents in the UK.” Source: RevenueBase Database · checked Sep 18, 2026
3	CFC	Strong evidence	London, United KingdomHQ checked Sep 18, 2026	1,001-5,000	1,115 contacts →
	Strong evidence “CFC is a specialist insurance provider, pioneer in emerging risk and market leader in cyber.” Source: RevenueBase Database · checked Sep 18, 2026
4	Miller Insurance Services LLP	Indirect evidence	London, United KingdomHQ checked Sep 18, 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 18, 2026
5	Canopius Group	Partial evidence	22 Bishopsgate, United KingdomHQ checked Sep 18, 2026	501-1,000	853 contacts →
	Partial 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 18, 2026
6	Chaucer Group	Strong evidence	City Of London, United KingdomHQ checked Sep 18, 2026	501-1,000	694 contacts →
	Strong 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 18, 2026
7	Tokio Marine Kiln	Strong evidence	London, United KingdomHQ checked Sep 18, 2026	501-1,000	677 contacts →
	Strong 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 18, 2026
8	CNA Hardy	Strong evidence	London, United KingdomHQ checked Sep 18, 2026	501-1,000	553 contacts →
	Strong evidence “CNA Hardy is a leading specialist commercial insurance provider for clients within the Lloyd’s and company markets.” Source: RevenueBase Database · checked Sep 18, 2026
9	ERS	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	501-1,000	509 contacts →
	Partial evidence “ERS is the UK's largest specialist motor insurer with an A+ rating.” Source: RevenueBase Database · checked Sep 18, 2026
10	Tokio Marine HCC International	Strong evidence	London, United KingdomHQ checked Sep 18, 2026	1,001-5,000	463 contacts →
	Strong 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 18, 2026
11	Talbot Underwriting	Partial evidence	London, United KingdomHQ checked Sep 18, 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 18, 2026
12	IQUW	Indirect evidence	City Of London, United KingdomHQ checked Sep 18, 2026	201-500	346 contacts →
	Indirect evidence “IQUW is now Starr.” Source: RevenueBase Database · checked Sep 18, 2026
13	INIGO	Indirect evidence	London, United KingdomHQ checked Sep 18, 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 18, 2026
14	Atrium	Strong evidence	London, United KingdomHQ checked Sep 18, 2026	201-500	234 contacts →
	Strong evidence “Atrium is a leading (re)insurance group at Lloyd's, the world's specialist insurance market.” Source: RevenueBase Database · checked Sep 18, 2026
15	Newline Group	Strong evidence	London Ec3m 5bn, United KingdomHQ checked Sep 18, 2026	201-500	215 contacts →
	Strong 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 18, 2026
16	Rokstone Underwriting	Indirect evidence	London, United KingdomHQ checked Sep 18, 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 18, 2026
17	Munich RE Specialty	Strong evidence	Manchester, United KingdomHQ checked Sep 18, 2026	51-200	180 contacts →
	Strong 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 18, 2026
18	Clegg Gifford	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	51-200	175 contacts →
	Partial evidence “We are a dynamic Lloyd's broker who arrange insurance for private individuals and commercial ventures alike.” Source: RevenueBase Database · checked Sep 18, 2026
19	Dual UK	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	501-1,000	173 contacts →
	Partial evidence “DUAL is driven by a mission to be the MGA of choice for brokers, clients and carriers, through the provision of deep underwriting expertise and global distribution.” Source: RevenueBase Database · checked Sep 18, 2026
20	Nexus Underwriting	Strong evidence	London, United KingdomHQ checked Sep 18, 2026	201-500	158 contacts →
	Strong evidence “Founded in 2008 and based in London, UK, the Nexus Group is a leading, independent, specialty Managing General Agent (MGA) group with a focus on niche insurance classes of…” Source: RevenueBase Database · checked Sep 18, 2026
21	Volante Global	Partial evidence	London, United KingdomHQ checked Sep 18, 2026	201-500	132 contacts →
	Partial evidence “Volante Global provides a truly unique underwriting framework.” Source: RevenueBase Database · checked Sep 18, 2026
22	Bridge Insurance Brokers Limited	Partial evidence	Manchester, United KingdomHQ checked Sep 18, 2026	51-200	122 contacts →
	Partial evidence “Bridge Insurance Brokers Limited (Bridge) is a leading independent corporate insurance broker with offices in both Manchester and London.” Source: RevenueBase Database · checked Sep 18, 2026
23	GEO Underwriting	Strong evidence	London, United KingdomHQ checked Sep 18, 2026	501-1,000	114 contacts →
	Strong evidence “A chartered MGA and Lloyd’s cover holder, Geo Underwriting is a UK Commercial MGA specialising in tailored insurance solutions catering to non-standard and niche requirements.” Source: RevenueBase Database · checked Sep 18, 2026
24	Faraday Underwriting Limited	Indirect evidence	London, United KingdomHQ checked Sep 18, 2026	51-200	107 contacts →
	Indirect evidence “Professional.” Source: RevenueBase Database · checked Sep 18, 2026
25	Miles Smith	Strong evidence	London, United KingdomHQ checked Sep 18, 2026	1,001-5,000	104 contacts →
	Strong evidence “Specialist Risk Group (SRG) is a group of specialist insurance intermediaries supporting businesses and individuals with complex insurance requirements across the UK, Europe and…” Source: RevenueBase Database · checked Sep 18, 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: specialty insurance underwriting 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 specialty insurance underwriting firms.
Partial evidence: Its own public description names part of specialty insurance underwriting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name specialty insurance underwriting 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 402 specialty insurance underwriting firms based in the United Kingdom

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Specialty insurance underwriting firms based in the United Kingdom at a glance

As of Sep 18, 2026

50.3%Verified-email coverage

57.2Average contacts per company

11-50Median size (employees)

46.3%Largest-city concentration · London

Sep 18, 2026Page data refreshed

Companies by employee count

1-10

136

11-50

172

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 402 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 specialty insurance underwriting 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 “specialty insurance underwriting 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 specialty insurance underwriting 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 specialty insurance underwriting 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, 11,568 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 18, 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.

Specialty insurance underwriting firms by metro

Specialty insurance underwriting firms in London186

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 specialty insurance underwriting 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 specialty insurance underwriting firms are there based in the United Kingdom?

RevenueBase identified 402 specialty insurance underwriting 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?

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

Which city has the most specialty insurance underwriting firms?

London leads with 186 headquartered companies, followed by Manchester (8) and Birmingham (7).

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 11,568 verified decision-maker contacts tracked across these 402 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 18, 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.