Company lists · Data refreshed September 2026

Top 25 Specialty reinsurance underwriters based in the United States

RevenueBase identified 358 company matches for specialty reinsurance underwriters associated with the United States as of September 2026 and tracks 45,276 professional contacts across them, including 23,756 with verified work emails. New York is the largest hub.

This list covers company matches for specialty reinsurance underwriters associated with the United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 18, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Sep 18, 2026 How this list was built
358Companies
45,276Contacts tracked
23,756Verified emails
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The 25 largest specialty reinsurance underwriters based in the United States

Ranked by team size
Top 25 of 358 company matches for specialty reinsurance underwriters based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 18, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#CompanyRevenueBase SmartSearchHeadquartersEmployeesContacts
1Exact matchCharlotte, NC, United StatesHQ recorded Sep 18, 20265,001-10,0004,926 contacts →

Exact match

“Amwins is the largest wholesale distributor of specialty insurance products and services in the U.S.”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
2Exact matchChesterfield, MO, United StatesHQ recorded Sep 18, 20261,001-5,0004,128 contacts →

Exact match

“Reinsurance Group of America, Incorporated (NYSE: RGA) is a global industry leader specializing in life and health reinsurance and financial solutions that help clients…”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
3Exact matchWarren, NJ, United StatesHQ recorded Sep 18, 20261,001-5,0003,411 contacts →

Exact match

“Everest Group, Ltd.(“Everest”) is a global underwriting leader providing best-in-class property, casualty, and specialty reinsurance and insurance solutions that address…”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
4Exact matchGlen Allen, VA, United StatesHQ recorded Sep 18, 20261,001-5,0003,151 contacts →

Exact match

“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…”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
5Exact matchCharlotte, NC, United StatesHQ recorded Sep 18, 20265,001-10,0002,959 contacts →

Exact match

“CRC Group is all about progress.”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
6Exact matchNew York, NY, United StatesHQ recorded Sep 18, 202610001+1,883 contacts →

Exact match

“At QBE we’re driven by our purpose of enabling a more resilient future.”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
7Exact matchStamford, CT, United StatesHQ recorded Sep 18, 20261,001-5,0001,542 contacts →

Exact match

“Gen Re is a leading property/casualty and life/health reinsurance company.”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
8Exact matchPeoria, IL, United StatesHQ recorded Sep 18, 20261,001-5,0001,386 contacts →

Exact match

“RLI is a U.S-based specialty insurer that serves niche property, casualty and surety markets.”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
9Exact matchChicago, IL, United StatesHQ recorded Sep 18, 20265,001-10,0001,079 contacts →

Exact match

“Ryan Specialty (NYSE: RYAN) is an international specialty insurance firm that provides distribution, underwriting, product development, administration and risk management services…”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
10Exact matchSt. Louis, MO, United StatesHQ recorded Sep 18, 2026501-1,0001,008 contacts →

Exact match

“Safety National is a leading specialty insurance and reinsurance provider.”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
11Exact matchNew York, NY, United StatesHQ recorded Sep 18, 2026501-1,000851 contacts →

Exact match

“Argo Group is a U.S-focused underwriter of specialty insurance products in the property and casualty market.”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
12Exact matchOmaha, NE, United StatesHQ recorded Sep 18, 20261,001-5,000680 contacts →

Exact match

“Applied Underwriters® is a global risk services firm helping business and people manage uncertainty through its business services, insurance, and reinsurance solutions.”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
13Exact matchNew York, NY, United StatesHQ recorded Sep 18, 2026201-500675 contacts →

Exact match

“Headquartered in New York City with offices throughout the U.S.”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
14Exact matchNew York, NY, United StatesHQ recorded Sep 18, 2026501-1,000578 contacts →

Exact match

“We are a leading international reinsurance organization headquartered in New York with operations worldwide.”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
15Exact matchHouston, TX, United StatesHQ recorded Sep 18, 2026501-1,000561 contacts →

Exact match

“Skyward Specialty is a rapidly growing and innovative specialty insurance company, delivering commercial P&C products and solutions on a non-admitted and admitted basis.”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
16Exact matchJacksonville, FL, United StatesHQ recorded Sep 18, 2026501-1,000553 contacts →

Exact match

“For more than 45 years, Fortegra and its subsidiaries have delivered risk management solutions that help people and businesses succeed in the face of uncertainty.”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
17Exact matchStamford, CT, United StatesHQ recorded Sep 18, 2026501-1,000530 contacts →

Exact match

“OdysseyRe offers a broad range of property, casualty, and specialty reinsurance solutions through a network of 14 branch and representative offices around the world.”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
18Exact matchAtlanta, GA, United StatesHQ recorded Sep 18, 2026201-500442 contacts →

Exact match

“RSUI is a leading underwriter of wholesale specialty insurance.”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
19Exact matchFond Du Lac, WI, United StatesHQ recorded Sep 18, 2026201-500409 contacts →

Exact match

“Society Insurance has been a leading niche insurance carrier since 1915.”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
20Exact matchNew York, NY, United StatesHQ recorded Sep 18, 2026201-500377 contacts →

Exact match

“Seneca Insurance Company is a Specialty Property and Casualty Insurance company with thirteen offices across the U.S.”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
21Exact matchHartford, CT, United StatesHQ recorded Sep 18, 202610001+367 contacts →

Exact match

“Navigators, a brand of The Hartford is a market-leading provider of E&S solutions.”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
22Exact matchAlpharetta, GA, United StatesHQ recorded Sep 18, 2026501-1,000363 contacts →

Exact match

“About Us Westchester is one of the largest and most diverse excess and surplus lines commercial property and casualty insurance companies in the United States.”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
23Exact matchNY, United StatesHQ recorded Sep 18, 20261,001-5,000344 contacts →

Exact match

“Ironshore, a Liberty Mutual Company, is dedicated to the wholesale market.”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
24Exact matchBala Cynwyd, PA, United StatesHQ recorded Sep 18, 2026201-500300 contacts →

Exact match

“GBLI | Global Indemnity provides specialty property and casualty coverage for a wide range of markets-from small business, manufactured homes, and vacant property to agriculture…”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
25Exact matchBlue Bell, PA, United StatesHQ recorded Sep 18, 2026501-1,000293 contacts →

Exact match

“We are one of the world's leading providers of risk and capital optimization solutions, serving insurers, pension schemes, and financial institutions across North America, Europe…”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase

Showing 25 of 358 specialty reinsurance underwriters based in the United States

See the full list, filter by size, metro and specialty, and access 23,756 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Specialty reinsurance underwriters based in the United States at a glance

As of Sep 18, 2026
52.5%Verified-email coverage
126.5Average contacts per company
11-50Median size (employees)
9.5%Largest-city concentration · New York
Sep 18, 2026Page data refreshed

Companies by employee count

1-10
111
11-50
128
51-200
58
201-500
22
501-1,000
18
1,001-5,000
12
5,001-10,000
5
10001+
3

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 358 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source
The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies
Company records associated with the United States whose business descriptions match “specialty reinsurance underwriters” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch
Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview
The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality
RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 23,756 professional contacts with verified work emails across the full matched dataset. 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.
Record context
Company records and descriptions can change. Check the company's website for its current services and locations.

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “specialty reinsurance underwriters”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many specialty reinsurance underwriters are there based in the United States?

RevenueBase identified 358 company matches for specialty reinsurance underwriters associated with the United States as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Amwins tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most specialty reinsurance underwriters?

New York leads with 34 company records, followed by Miami (18) and Chicago (12).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 23,756 professional contacts with verified work emails tracked across these 358 companies; direct dials are available where recorded.

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 SmartSearch, 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.