Company lists · Data refreshed September 2026

Top 25 Underwriting companies worldwide

Name: Underwriting companies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 7,163 companies tracked

RevenueBase identified 7,163 underwriting companies worldwide as of September 2026 and tracks 480,123 professional contacts across them, including 191,606 with verified work emails. The United States is the largest market and London the largest hub.

This list covers underwriting companies worldwide, 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 22, 2026. Country and city lists for underwriting companies follow the table.

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 22, 2026 86% judged on-target in blind review

7,163Companies

480,123Contacts tracked

191,606Verified emails

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The 25 largest underwriting companies worldwide

Ranked by team size

Top 25 of 7,163 underwriting companies worldwide, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to 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	CHUBB	Indirect evidence	Zurich, SwitzerlandHQ checked Sep 22, 2026	10001+	35,664 contacts →
	Indirect evidence “Chubb is a world leader in insurance.” Source: RevenueBase Database · checked Sep 22, 2026
2	Travelers	Indirect evidence	New York, NY, United StatesHQ checked Sep 22, 2026	10001+	32,682 contacts →
	Indirect evidence “Travelers provides insurance coverage to protect the things that are important to you – your home, your car, your valuables and your business.” Source: RevenueBase Database · checked Sep 22, 2026
3	AIG	Indirect evidence	New York, NY, United StatesHQ checked Sep 22, 2026	10001+	23,438 contacts →
	Indirect evidence “American International Group, Inc.(NYSE: AIG) is a leading global insurance organization.” Source: RevenueBase Database · checked Sep 22, 2026
4	HUB International	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	10001+	14,217 contacts →
	Indirect evidence “Hi, we’re HUB.” Source: RevenueBase Database · checked Sep 22, 2026
5	Swiss RE	Indirect evidence	Zurich, SwitzerlandHQ checked Sep 22, 2026	10001+	13,675 contacts →
	Indirect evidence “The Swiss Re Group is a leading wholesale provider of reinsurance, insurance and other insurance-based forms of risk transfer.” Source: RevenueBase Database · checked Sep 22, 2026
6	AXA XL	Indirect evidence	Hamilton, BermudaHQ checked Sep 22, 2026	10001+	9,825 contacts →
	Indirect evidence “We are a leading provider of insurance and reinsurance offering innovative risk management solutions for businesses worldwide.” Source: RevenueBase Database · checked Sep 22, 2026
7	QBE Insurance	Indirect evidence	Sydney, AustraliaHQ checked Sep 22, 2026	10001+	9,614 contacts →
	Indirect evidence “At QBE we’re driven by our purpose of enabling a more resilient future.” Source: RevenueBase Database · checked Sep 22, 2026
8	Munich RE	Indirect evidence	Munich, GermanyHQ checked Sep 22, 2026	10001+	9,143 contacts →
	Indirect evidence “Munich Re is one of the world’s leading providers of reinsurance, primary insurance and insurance-related risk solutions.” Source: RevenueBase Database · checked Sep 22, 2026
9	Marsh Mclennan Agency	Indirect evidence	White Plains, NY, United StatesHQ checked Sep 22, 2026	10001+	9,086 contacts →
	Indirect evidence “Marsh McLennan Agency, a business of Marsh (NYSE: MRSH), is a leading provider of business insurance, employee health & benefits, retirement & wealth, and private client insurance…” Source: RevenueBase Database · checked Sep 22, 2026
10	Zurich North America	Indirect evidence	Schaumburg, IL, United StatesHQ checked Sep 22, 2026	5,001-10,000	8,988 contacts →
	Indirect evidence “Zurich North America is one of the largest providers of insurance solutions and services to businesses and individuals.” Source: RevenueBase Database · checked Sep 22, 2026
11	CNA Insurance	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	5,001-10,000	6,984 contacts →
	Indirect evidence “CNA is one of the largest U.S.” Source: RevenueBase Database · checked Sep 22, 2026
12	Allianz France	Indirect evidence	Puteaux, FranceHQ checked Sep 22, 2026	5,001-10,000	6,821 contacts →
	Indirect evidence “Numéro 1 mondial en assurance de biens et de responsabilités, numéro 2 mondial en assurance de personnes, Allianz propose une offre complète qui couvre tous les besoins en…” Source: RevenueBase Database · checked Sep 22, 2026
13	Kemper	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	5,001-10,000	5,419 contacts →
	Indirect evidence “The Kemper family of companies is one of the nation’s leading specialized insurers.” Source: RevenueBase Database · checked Sep 22, 2026
14	Amwins	Indirect evidence	Charlotte, NC, United StatesHQ checked Sep 22, 2026	5,001-10,000	4,926 contacts →
	Indirect evidence “Amwins is the largest wholesale distributor of specialty insurance products and services in the U.S.” Source: RevenueBase Database · checked Sep 22, 2026
15	Hollard Insurance	Indirect evidence	Johannesburg, South AfricaHQ checked Sep 22, 2026	1,001-5,000	4,528 contacts →
	Indirect evidence “Life is full of unsures.” Source: RevenueBase Database · checked Sep 22, 2026
16	Reinsurance Group Of America, Incorporated	Indirect evidence	Chesterfield, MO, United StatesHQ checked Sep 22, 2026	1,001-5,000	4,128 contacts →
	Indirect evidence “Reinsurance Group of America, Incorporated (NYSE: RGA) is a global industry leader specializing in life and health reinsurance and financial solutions that help clients…” Source: RevenueBase Database · checked Sep 22, 2026
17	Sentry	Indirect evidence	Stevens Point, WI, United StatesHQ checked Sep 22, 2026	5,001-10,000	3,963 contacts →
	Indirect evidence “Sentry Insurance got its start in 1904, when members of the Wisconsin Retail Hardware Association formed their own insurance company.” Source: RevenueBase Database · checked Sep 22, 2026
18	HDI Global SE	Indirect evidence	Hannover, GermanyHQ checked Sep 22, 2026	5,001-10,000	3,763 contacts →
	Indirect evidence “HDI Global SE – Your Trusted Partner in Transformation Companies in the trading, manufacturing, and service industries need a reliable insurance partner.” Source: RevenueBase Database · checked Sep 22, 2026
19	SCOR	Indirect evidence	Paris, FranceHQ checked Sep 22, 2026	1,001-5,000	3,467 contacts →
	Indirect evidence “SCOR, one of the world’s largest reinsurers, serves more than clients worldwide, providing a diversified and innovative range of solutions to control and manage risk.” Source: RevenueBase Database · checked Sep 22, 2026
20	Everest	Strong evidence	Warren, NJ, United StatesHQ checked Sep 22, 2026	1,001-5,000	3,411 contacts →
	Strong evidence “Everest Group, Ltd.(“Everest”) is a global underwriting leader providing best-in-class property, casualty, and specialty reinsurance and insurance solutions that address…” Source: RevenueBase Database · checked Sep 22, 2026
21	SOMPO	Indirect evidence	Pembroke, BermudaHQ checked Sep 22, 2026	5,001-10,000	3,309 contacts →
	Indirect evidence “We are Sompo, a global provider of commercial and consumer property, casualty, and specialty insurance and reinsurance.” Source: RevenueBase Database · checked Sep 22, 2026
22	Markel	Indirect evidence	Glen Allen, VA, United StatesHQ checked Sep 22, 2026	1,001-5,000	3,151 contacts →
	Indirect evidence “As the insurance operations within the Markel Group Inc.(NYSE: MKL), we leverage a broad array of capabilities and expertise to create intelligent solutions for the most complex…” Source: RevenueBase Database · checked Sep 22, 2026
23	Mcgriff	Indirect evidence	Charlotte, NC, United StatesHQ checked Sep 22, 2026	1,001-5,000	3,021 contacts →
	Indirect evidence “When it comes to protecting what matters most in business and everyday life, at McGriff we believe our clients should never settle for less than the best.” Source: RevenueBase Database · checked Sep 22, 2026
24	RT Specialty	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	1,001-5,000	2,955 contacts →
	Indirect evidence “RT Specialty is a leading wholesale distributor of specialty insurance products and services and the wholesale broking specialty for Ryan Specialty.” Source: RevenueBase Database · checked Sep 22, 2026
25	Royal Sundaram General Insurance Co. Limited	Indirect evidence	Chennai, IndiaHQ checked Sep 22, 2026	1,001-5,000	2,580 contacts →
	Indirect evidence “Royal Sundaram is a leading provider of innovative general insurance solutions to individuals, families, and businesses, both directly and through intermediaries and affinity…” Source: RevenueBase Database · checked Sep 22, 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: 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 underwriting companies.
Partial evidence: Its own public description names part of underwriting companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name 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 7,163 underwriting companies worldwide

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Underwriting companies worldwide at a glance

As of Sep 22, 2026

39.9%Verified-email coverage

67.0Average contacts per company

11-50Median size (employees)

3.4%Largest-city concentration · London

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

3,481

11-50

2,220

51-200

792

201-500

275

501-1,000

119

1,001-5,000

138

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 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.
Coverage: Every country. Country and city lists for underwriting companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “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 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 underwriting companies, and records with no verified work email.
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, 191,606 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 22, 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.

Underwriting companies by location

32 lists · largest first

Every Underwriting companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 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 underwriting companies are there worldwide?

RevenueBase identified 7,163 underwriting companies worldwide 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?

CHUBB, headquartered in Worldwide, tops this list with the largest team on record.

Which country has the most underwriting companies?

The United States leads with 2,227 companies, followed by the United Kingdom (539) and Brazil (379). Every underwriting companies list by country and city is linked on this page.

Which city has the most underwriting companies?

London leads with 247 headquartered companies, followed by Sao Paulo (120) and New York (72).

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 191,606 verified decision-maker contacts tracked across these 7,163 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 22, 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.