Company lists · Data refreshed September 2026

Top 25 Insurance reinsurance companies based in the United States

Name: Insurance reinsurance companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 772 companies tracked

RevenueBase identified 772 insurance reinsurance companies headquartered in the United States as of September 2026 and tracks 125,360 professional contacts across them, including 56,829 with verified work emails. New York is the largest hub.

This list covers insurance reinsurance companies headquartered in the United States, 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

772Companies

125,360Contacts tracked

56,829Verified emails

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The 25 largest insurance reinsurance companies based in the United States

Ranked by team size

Top 25 of 772 insurance reinsurance companies based in the United States, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to insurance reinsurance 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	Liberty Mutual Insurance	Indirect evidence	Boston, MA, United StatesHQ checked Sep 17, 2026	10001+	30,330 contacts →
	Indirect evidence “At Liberty Mutual, we believe progress happens when people feel secure.” Source: RevenueBase Database · checked Sep 17, 2026
2	Amwins	Partial evidence	Charlotte, NC, United StatesHQ checked Sep 17, 2026	5,001-10,000	4,926 contacts →
	Partial evidence “Amwins is the largest wholesale distributor of specialty insurance products and services in the U.S.” Source: RevenueBase Database · checked Sep 17, 2026
3	Reinsurance Group Of America, Incorporated	Partial evidence	Chesterfield, MO, United StatesHQ checked Sep 17, 2026	1,001-5,000	4,128 contacts →
	Partial 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 17, 2026
4	GUY Carpenter	Partial evidence	New York, NY, United StatesHQ checked Sep 17, 2026	1,001-5,000	4,072 contacts →
	Partial evidence “At Guy Carpenter, a Marsh business, we deliver a powerful combination of (re)insurance broking expertise, capital solutions, global analytics, advisory, and client support…” Source: RevenueBase Database · checked Sep 17, 2026
5	Everest	Strong evidence	Warren, NJ, United StatesHQ checked Sep 17, 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 17, 2026
6	Mcgriff	Indirect evidence	Charlotte, NC, United StatesHQ checked Sep 17, 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 17, 2026
7	QBE North America	Indirect evidence	New York, NY, United StatesHQ checked Sep 17, 2026	10001+	1,883 contacts →
	Indirect evidence “At QBE we’re driven by our purpose of enabling a more resilient future.” Source: RevenueBase Database · checked Sep 17, 2026
8	Berkshire Hathaway Specialty Insurance	Partial evidence	Boston, MA, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,799 contacts →
	Partial evidence “Berkshire Hathaway Specialty Insurance is an organization committed to providing long-term risk solutions and claims care to our customers backed by the financial strength of…” Source: RevenueBase Database · checked Sep 17, 2026
9	GEN RE	Partial evidence	Stamford, CT, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,542 contacts →
	Partial evidence “Gen Re is a leading property/casualty and life/health reinsurance company.” Source: RevenueBase Database · checked Sep 17, 2026
10	ISO	Partial evidence	Jersey City, NJ, United StatesHQ checked Sep 17, 2026	5,001-10,000	1,097 contacts →
	Partial evidence “Underwriting solutions at Verisk is a leading provider of advanced tools and analytics for the property/casualty and life insurance industries.” Source: RevenueBase Database · checked Sep 17, 2026
11	Ryan Specialty	Partial evidence	Chicago, IL, United StatesHQ checked Sep 17, 2026	5,001-10,000	1,079 contacts →
	Partial evidence “Ryan Specialty (NYSE: RYAN) is an international specialty insurance firm that provides distribution, underwriting, product development, administration and risk management services…” Source: RevenueBase Database · checked Sep 17, 2026
12	Safety National	Strong evidence	St Louis, MO, United StatesHQ checked Sep 17, 2026	501-1,000	1,008 contacts →
	Strong evidence “Safety National is a leading specialty insurance and reinsurance provider.” Source: RevenueBase Database · checked Sep 17, 2026
13	HRH	Partial evidence	Radnor, PA, United StatesHQ checked Sep 17, 2026	1,001-5,000	930 contacts →
	Partial evidence “Willis Group Holdings plc is a leading global insurance broker.” Source: RevenueBase Database · checked Sep 17, 2026
14	Applied Underwriters	Strong evidence	Omaha, NE, United StatesHQ checked Sep 17, 2026	1,001-5,000	680 contacts →
	Strong evidence “Applied Underwriters® is a global risk services firm helping business and people manage uncertainty through its business services, insurance, and reinsurance solutions.” Source: RevenueBase Database · checked Sep 17, 2026
15	Transre	Partial evidence	New York, NY, United StatesHQ checked Sep 17, 2026	501-1,000	578 contacts →
	Partial evidence “We are a leading international reinsurance organization headquartered in New York with operations worldwide.” Source: RevenueBase Database · checked Sep 17, 2026
16	Foundation Risk Partners	Partial evidence	Ormond Beach, FL, United StatesHQ checked Sep 17, 2026	1,001-5,000	531 contacts →
	Partial evidence “Foundation Risk Partners is one of the fastest growing insurance brokerage and consulting firms in the United States.” Source: RevenueBase Database · checked Sep 17, 2026
17	Odysseyre	Partial evidence	Stamford, CT, United StatesHQ checked Sep 17, 2026	501-1,000	530 contacts →
	Partial evidence “OdysseyRe offers a broad range of property, casualty, and specialty reinsurance solutions through a network of 14 branch and representative offices around the world.” Source: RevenueBase Database · checked Sep 17, 2026
18	Talcott Financial Group	Partial evidence	Hartford, CT, United StatesHQ checked Sep 17, 2026	501-1,000	474 contacts →
	Partial evidence “Talcott Financial Group is an international life insurance group that combines deep industry experience with a spirit of forward-looking innovation.” Source: RevenueBase Database · checked Sep 17, 2026
19	Jencap	Indirect evidence	New York, NY, United StatesHQ checked Sep 17, 2026	1,001-5,000	428 contacts →
	Indirect evidence “Jencap provides retail agents with carrier exclusivity, underwriting mastery, and unparalleled customer service.” Source: RevenueBase Database · checked Sep 17, 2026
20	HM Insurance Group	Partial evidence	Pittsburgh, PA, United StatesHQ checked Sep 17, 2026	201-500	360 contacts →
	Partial evidence “HM Insurance Group (HM) works to protect businesses from the financial risk associated with health care costs.” Source: RevenueBase Database · checked Sep 17, 2026
21	Arch Capital Services LLC	Strong evidence	White Plains, NY, United StatesHQ checked Sep 17, 2026	51-200	359 contacts →
	Strong evidence “Arch Capital Group Ltd.(Arch Capital or ACGL), a Bermuda public limited liability company, writes insurance and reinsurance on a worldwide basis through operations in Bermuda, the…” Source: RevenueBase Database · checked Sep 17, 2026
22	Atlantic Casualty Insurance CO	Partial evidence	Goldsboro, NC, United StatesHQ checked Sep 17, 2026	201-500	335 contacts →
	Partial evidence “Atlantic Casualty Insurance Company (Atlantic Casualty) was formed by Strickland Insurance Group (SIG) in 1983 to underwrite a substantial book of non-standard personal auto.” Source: RevenueBase Database · checked Sep 17, 2026
23	CRC Swett	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 17, 2026	1,001-5,000	329 contacts →
	Indirect evidence “CRC Swett has over 100 years of experience in helping to mitigate the risks of doing business here and around the globe.” Source: RevenueBase Database · checked Sep 17, 2026
24	H.W. Kaufman Group	Indirect evidence	Farmington Hills, MI, United StatesHQ checked Sep 17, 2026	1,001-5,000	322 contacts →
	Indirect evidence “At H.W.” Source: RevenueBase Database · checked Sep 17, 2026
25	Riverstone	Indirect evidence	Manchester, NH, United StatesHQ checked Sep 17, 2026	201-500	313 contacts →
	Indirect evidence “We Deliver RiskSmart Run-Off(R) Solutions With Global Reach Aligning risk with the need for capital efficiency and greater business focus is a key challenge for insurers and…” 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: insurance reinsurance 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 insurance reinsurance companies.
Partial evidence: Its own public description names part of insurance reinsurance companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name insurance reinsurance 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 772 insurance reinsurance companies based in the United States

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Insurance reinsurance companies based in the United States at a glance

As of Sep 17, 2026

45.3%Verified-email coverage

162.4Average contacts per company

11-50Median size (employees)

5.2%Largest-city concentration · New York

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

312

11-50

283

51-200

105

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 772 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 insurance reinsurance 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 States whose own description of what they do matches “insurance reinsurance 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 insurance reinsurance 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 insurance reinsurance companies, and records with no verified work email. Companies headquartered outside United States 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, 56,829 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.

Insurance reinsurance companies by metro

Insurance reinsurance companies in New York40
Insurance reinsurance companies in Miami34

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 insurance reinsurance 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 insurance reinsurance companies are there based in the United States?

RevenueBase identified 772 insurance reinsurance companies headquartered in the United States 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?

Liberty Mutual Insurance, headquartered in Boston, tops this list with the largest team on record.

Which city has the most insurance reinsurance companies?

New York leads with 40 headquartered companies, followed by Miami (34) and Houston (14).

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 56,829 verified decision-maker contacts tracked across these 772 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.