Company lists · Data refreshed September 2026
Top 25 Excess and surplus reinsurers based in the United States
RevenueBase identified 143 excess and surplus reinsurers headquartered in the United States as of September 2026 and tracks 19,759 professional contacts across them, including 9,932 with verified work emails. New York is the largest hub.
This list covers excess and surplus reinsurers 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 20, 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.
The 25 largest excess and surplus reinsurers based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 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 20, 2026Thanks. The Data Team will review it. | |||||
| 2 | 3,411 contacts → | ||||
Indirect 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 20, 2026Thanks. The Data Team will review it. | |||||
| 3 | 1,883 contacts → | ||||
Indirect evidence “At QBE we’re driven by our purpose of enabling a more resilient future.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 4 | 1,542 contacts → | ||||
Indirect evidence “Gen Re is a leading property/casualty and life/health reinsurance company.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 5 | 653 contacts → | ||||
Strong evidence “Kinsale Insurance is an excess and surplus (E&S) lines insurance company located in Richmond, VA specializing in hard-to-place property, casualty, and specialty risks.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 6 | 614 contacts → | ||||
Strong evidence “Admiral Insurance Group, a Berkley company, provides excess and surplus (E&S) lines of commercial insurance exclusively through our nationwide network of wholesale brokers.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 7 | 578 contacts → | ||||
Indirect evidence “We are a leading international reinsurance organization headquartered in New York with operations worldwide.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 8 | 530 contacts → | ||||
Indirect 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 20, 2026Thanks. The Data Team will review it. | |||||
| 9 | 367 contacts → | ||||
Indirect evidence “Navigators, a brand of The Hartford is a market-leading provider of E&S solutions.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 10 | 363 contacts → | ||||
Strong evidence “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.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 11 | 360 contacts → | ||||
Indirect evidence “HM Insurance Group (HM) works to protect businesses from the financial risk associated with health care costs.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 12 | 344 contacts → | ||||
Indirect evidence “Ironshore, a Liberty Mutual Company, is dedicated to the wholesale market.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 13 | 263 contacts → | ||||
Strong evidence “Prime Insurance Company is an excess and surplus lines insurance carrier that specializes in providing solutions for hard-to-place and declined risks.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 14 | 216 contacts → | ||||
Indirect evidence “Richmond National is a specialty property & casualty insurance company focused on providing insurance to small and mid-size businesses that are unable to find coverage in the…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 15 | 205 contacts → | ||||
Strong evidence “GenStar Insurance Services, LLC is a premier provider of excess, surplus, and specialty property and casualty insurance written on General Star Indemnity Company (non-admitted)…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 16 | 193 contacts → | ||||
Indirect evidence “We write a wide variety of complex transactional and specialty casualty and reinsurance risks, creating customized responsive underwriting solutions for a range of exposures.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 17 | 175 contacts → | ||||
Indirect evidence “Stealth Partner Group was founded in 2009 when two experienced insurance professionals envisioned a new kind of "Specialized General Agency" that focused exclusively on providing…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 18 | 165 contacts → | ||||
Partial evidence “Surplus Lines Made Easy!” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 19 | 160 contacts → | ||||
Strong evidence “Century Insurance Group is a premier provider of excess and surplus lines insurance and is a division of AF Group, whose brands are premier providers of innovative, specialty…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 20 | 133 contacts → | ||||
Indirect evidence “American Agricultural Insurance Company (AmericanAg®) stands out from the marketplace as a provider of reinsurance services across the insurance spectrum with a growing global…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 21 | 128 contacts → | ||||
Indirect evidence “The Stamford, Connecticut-based RVI Group is a financial services company focused on specialty property and casualty insurance and reinsurance.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 22 | 111 contacts → | ||||
Indirect evidence “Arch Re's Facultative Reinsurance division focuses on supplying significant capacity to the global reinsurance marketplace backed by creative solutions and superior client service.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 23 | 96 contacts → | ||||
Strong evidence “As a trusted affiliate of Selective Insurance, MUSIC (Mesa Underwriters Specialty Insurance Company) specializes in providing Excess & Surplus lines insurance solutions for risks…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 24 | 80 contacts → | ||||
Indirect evidence “Since 2015, Old Republic Alternative Markets has focused on delivering insurance and reinsurance solutions for complex risk environments, backed by the strength and stability of…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 25 | 76 contacts → | ||||
Indirect evidence “We strive to build successful partnerships and are committed to support the development of US life insurance companies of all sizes.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
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: excess and surplus reinsurers. 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 excess and surplus reinsurers.
- Partial evidence
- Its own public description names part of excess and surplus reinsurers, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name excess and surplus reinsurers. 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 143 excess and surplus reinsurers based in the United States
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Excess and surplus reinsurers based in the United States at a glance
As of Sep 20, 2026Companies by employee count
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 143 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 excess and surplus reinsurers, 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 “excess and surplus reinsurers”. 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 excess and surplus reinsurers), 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 excess and surplus reinsurers, 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, 9,932 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 20, 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.
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 excess and surplus reinsurers, 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 excess and surplus reinsurers are there based in the United States?
RevenueBase identified 143 excess and surplus reinsurers 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?
Reinsurance Group Of America, Incorporated, headquartered in Chesterfield, tops this list with the largest team on record.
Which city has the most excess and surplus reinsurers?
New York leads with 13 headquartered companies, followed by Stamford (9) and Dallas (6).
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 9,932 verified decision-maker contacts tracked across these 143 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 20, 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.
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