Company lists · Data refreshed September 2026
Top 25 Reinsurance underwriting companies based in the United States
RevenueBase identified 683 company matches for reinsurance underwriting companies associated with the United States as of September 2026 and tracks 181,199 professional contacts across them, including 84,434 with verified work emails. New York is the largest hub.
This list covers company matches for reinsurance underwriting companies 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 16, 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.
The 25 largest reinsurance underwriting companies based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 30,330 contacts → | ||||
Exact match “At Liberty Mutual, we believe progress happens when people feel secure.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase | |||||
| 2 | 23,438 contacts → | ||||
Exact match “American International Group, Inc.(NYSE: AIG) is a leading global insurance organization.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase | |||||
| 3 | 6,351 contacts → | ||||
Exact match “For nearly 200 years, FM has empowered businesses worldwide to manage risk, prevent loss, and build resilience.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase | |||||
| 4 | 4,926 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 16, 2026 · View company records in RevenueBase | |||||
| 5 | 4,128 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 16, 2026 · View company records in RevenueBase | |||||
| 6 | 4,072 contacts → | ||||
Exact match “At Guy Carpenter, a Marsh business, we deliver a powerful combination of (re)insurance broking expertise, capital solutions, global analytics, advisory, and client support…” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase | |||||
| 7 | 3,963 contacts → | ||||
Exact match “Sentry Insurance got its start in 1904, when members of the Wisconsin Retail Hardware Association formed their own insurance company.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase | |||||
| 8 | 3,411 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 16, 2026 · View company records in RevenueBase | |||||
| 9 | 3,151 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 16, 2026 · View company records in RevenueBase | |||||
| 10 | 3,021 contacts → | ||||
Exact match “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.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase | |||||
| 11 | 2,955 contacts → | ||||
Exact match “RT Specialty is a leading wholesale distributor of specialty insurance products and services and the wholesale broking specialty for Ryan Specialty.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase | |||||
| 12 | 2,105 contacts → | ||||
Exact match “Crum & Forster (C&F) provides market leading property & casualty, accident & health, specialty and standard commercial lines insurance solutions.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase | |||||
| 13 | 2,006 contacts → | ||||
Exact match “Tokio Marine HCC focuses on what matters most; our people.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase | |||||
| 14 | 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 16, 2026 · View company records in RevenueBase | |||||
| 15 | 1,799 contacts → | ||||
Exact match “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…” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase | |||||
| 16 | 1,542 contacts → | ||||
Exact match “Gen Re is a leading property/casualty and life/health reinsurance company.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase | |||||
| 17 | 1,386 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 16, 2026 · View company records in RevenueBase | |||||
| 18 | 1,262 contacts → | ||||
Exact match “Radian Group Inc.(NYSE: RDN) is a trusted, global multi-line specialty insurer, built to empower confident business decisions around the world.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase | |||||
| 19 | 1,097 contacts → | ||||
Exact match “Underwriting solutions at Verisk is a leading provider of advanced tools and analytics for the property/casualty and life insurance industries.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase | |||||
| 20 | 1,079 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 16, 2026 · View company records in RevenueBase | |||||
| 21 | 1,008 contacts → | ||||
Exact match “Safety National is a leading specialty insurance and reinsurance provider.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase | |||||
| 22 | 930 contacts → | ||||
Exact match “Willis Group Holdings plc is a leading global insurance broker.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase | |||||
| 23 | 851 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 16, 2026 · View company records in RevenueBase | |||||
| 24 | 843 contacts → | ||||
Exact match “Rated A+ Superior by AM Best (as of 8/13/25), Berkshire Hathaway GUARD Insurance Companies provides Property & Casualty insurance including Excess & Surplus lines.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase | |||||
| 25 | 693 contacts → | ||||
Exact match “MSIG USA is the partner that businesses rely on for creative, customized insurance solutions.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase | |||||
RevenueBase SmartSearch
Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.
This list uses Exact for “reinsurance underwriting companies”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.
Showing 25 of 683 reinsurance underwriting companies based in the United States
See the full list, filter by size, metro and specialty, and access 84,434 tracked professional contacts with verified work emails. Direct dials are available where recorded.
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Reinsurance underwriting companies based in the United States at a glance
As of Sep 16, 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 683 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 “reinsurance underwriting companies” 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 84,434 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 16, 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 “reinsurance underwriting companies”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many reinsurance underwriting companies are there based in the United States?
RevenueBase identified 683 company matches for reinsurance underwriting companies 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?
Liberty Mutual Insurance tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which city has the most reinsurance underwriting companies?
New York leads with 44 company records, followed by Miami (25) and Rolling Meadows (20).
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 84,434 professional contacts with verified work emails tracked across these 683 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 16, 2026.
Ready to reach these companies? Verified emails and direct dials for all 683 reinsurance underwriting companies based in the United States. Start with a free account, no credit card.
Download this list →Related lists
Reinsurance underwriting companies by geography
- Reinsurance underwriting companies based in Argentina
- Reinsurance underwriting companies based in Australia
- Reinsurance underwriting companies based in Bermuda
- Reinsurance underwriting companies based in Brazil
- Reinsurance underwriting companies based in Canada
- Reinsurance underwriting companies based in France
- Reinsurance underwriting companies based in Germany
- Reinsurance underwriting companies based in India
- Reinsurance underwriting companies based in Italy
- Reinsurance underwriting companies based in Mexico
- Reinsurance underwriting companies based in the Netherlands
- Reinsurance underwriting companies based in South Africa
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.
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Reinsurance underwriting companies based in Argentina
- Reinsurance underwriting companies based in Australia
- Reinsurance underwriting companies based in Bermuda
- Reinsurance underwriting companies based in Brazil
- Reinsurance underwriting companies based in Canada
- Reinsurance underwriting companies based in France
Company intelligence · public preview
Top 25 reinsurance underwriting companies based in the United States
Find companies in any niche.
Describe the businesses you want in your own words. RevenueBase SmartSearch matches company descriptions by meaning.
RevenueBase records 683 matching company records for reinsurance underwriting companies based in the United States, with 181,199 tracked contacts and 84,434 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: September 16, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 reinsurance underwriting companies based in the United States
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 |  Liberty Mutual Insurancelibertymutualgroup.comHQ: Boston, MA, United StatesReported employees: 10001+ | Boston, MA, United States | 10001+ | Exact match | 30,330 contacts → |
“At Liberty Mutual, we believe progress happens when people feel secure.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  AIGaig.comHQ: New York, NY, United StatesReported employees: 10001+ | New York, NY, United States | 10001+ | Exact match | 23,438 contacts → |
“American International Group, Inc.(NYSE: AIG) is a leading global insurance organization.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | FMfm.com HQ: Johnston, RI, United StatesReported employees: 5,001-10,000 | Johnston, RI, United States | 5,001-10,000 | Exact match | 6,351 contacts → |
“For nearly 200 years, FM has empowered businesses worldwide to manage risk, prevent loss, and build resilience.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  Amwinsamwins.comHQ: Charlotte, NC, United StatesReported employees: 5,001-10,000 | Charlotte, NC, United States | 5,001-10,000 | Exact match | 4,926 contacts → |
“Amwins is the largest wholesale distributor of specialty insurance products and services in the U.S.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | HQ: Chesterfield, MO, United StatesReported employees: 1,001-5,000 | Chesterfield, MO, United States | 1,001-5,000 | Exact match | 4,128 contacts → |
“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 description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  GUY Carpenterguycarp.comHQ: New York, NY, United StatesReported employees: 1,001-5,000 | New York, NY, United States | 1,001-5,000 | Exact match | 4,072 contacts → |
“At Guy Carpenter, a Marsh business, we deliver a powerful combination of (re)insurance broking expertise, capital solutions, global analytics, advisory, and client support…” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  Sentrylink.sentry.comHQ: Stevens Point, WI, United StatesReported employees: 5,001-10,000 | Stevens Point, WI, United States | 5,001-10,000 | Exact match | 3,963 contacts → |
“Sentry Insurance got its start in 1904, when members of the Wisconsin Retail Hardware Association formed their own insurance company.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  Everesteverestglobal.comHQ: Warren, NJ, United StatesReported employees: 1,001-5,000 | Warren, NJ, United States | 1,001-5,000 | Exact match | 3,411 contacts → |
“Everest Group, Ltd.(“Everest”) is a global underwriting leader providing best-in-class property, casualty, and specialty reinsurance and insurance solutions that address…” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 |  Markelmarkel.comHQ: Glen Allen, VA, United StatesReported employees: 1,001-5,000 | Glen Allen, VA, United States | 1,001-5,000 | Exact match | 3,151 contacts → |
“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 description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  Mcgriffmcgriff.comHQ: Charlotte, NC, United StatesReported employees: 1,001-5,000 | Charlotte, NC, United States | 1,001-5,000 | Exact match | 3,021 contacts → |
“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.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 |  RT Specialtyrtspecialty.comHQ: Chicago, IL, United StatesReported employees: 1,001-5,000 | Chicago, IL, United States | 1,001-5,000 | Exact match | 2,955 contacts → |
“RT Specialty is a leading wholesale distributor of specialty insurance products and services and the wholesale broking specialty for Ryan Specialty.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 |  Crum & Forstercfins.comHQ: Morristown, NJ, United StatesReported employees: 1,001-5,000 | Morristown, NJ, United States | 1,001-5,000 | Exact match | 2,105 contacts → |
“Crum & Forster (C&F) provides market leading property & casualty, accident & health, specialty and standard commercial lines insurance solutions.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 |  Tokio Marine HCCtmhcc.comHQ: Houston, TX, United StatesReported employees: 1,001-5,000 | Houston, TX, United States | 1,001-5,000 | Exact match | 2,006 contacts → |
“Tokio Marine HCC focuses on what matters most; our people.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 |  QBE North Americaqbe.comHQ: New York, NY, United StatesReported employees: 10001+ | New York, NY, United States | 10001+ | Exact match | 1,883 contacts → |
“At QBE we’re driven by our purpose of enabling a more resilient future.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  Berkshire Hathaway Specialty Insurancebhspecialty.comHQ: Boston, MA, United StatesReported employees: 1,001-5,000 | Boston, MA, United States | 1,001-5,000 | Exact match | 1,799 contacts → |
“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…” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  GEN REgenre.comHQ: Stamford, CT, United StatesReported employees: 1,001-5,000 | Stamford, CT, United States | 1,001-5,000 | Exact match | 1,542 contacts → |
“Gen Re is a leading property/casualty and life/health reinsurance company.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | RLI Insurance Companyrlicorp.com HQ: Peoria, IL, United StatesReported employees: 1,001-5,000 | Peoria, IL, United States | 1,001-5,000 | Exact match | 1,386 contacts → |
“RLI is a U.S-based specialty insurer that serves niche property, casualty and surety markets.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Radianradian.com HQ: Wayne, PA, United StatesReported employees: 1,001-5,000 | Wayne, PA, United States | 1,001-5,000 | Exact match | 1,262 contacts → |
“Radian Group Inc.(NYSE: RDN) is a trusted, global multi-line specialty insurer, built to empower confident business decisions around the world.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 |  ISOverisk.comHQ: Jersey City, NJ, United StatesReported employees: 5,001-10,000 | Jersey City, NJ, United States | 5,001-10,000 | Exact match | 1,097 contacts → |
“Underwriting solutions at Verisk is a leading provider of advanced tools and analytics for the property/casualty and life insurance industries.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 |  Ryan Specialtyryanspecialty.comHQ: Chicago, IL, United StatesReported employees: 5,001-10,000 | Chicago, IL, United States | 5,001-10,000 | Exact match | 1,079 contacts → |
“Ryan Specialty (NYSE: RYAN) is an international specialty insurance firm that provides distribution, underwriting, product development, administration and risk management services…” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 |  Safety Nationalsafetynational.comHQ: St. Louis, MO, United StatesReported employees: 501-1,000 | St. Louis, MO, United States | 501-1,000 | Exact match | 1,008 contacts → |
“Safety National is a leading specialty insurance and reinsurance provider.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 |  HRHwillis.comHQ: Radnor, PA, United StatesReported employees: 1,001-5,000 | Radnor, PA, United States | 1,001-5,000 | Exact match | 930 contacts → |
“Willis Group Holdings plc is a leading global insurance broker.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | Argo Groupargogroup.com HQ: New York, NY, United StatesReported employees: 501-1,000 | New York, NY, United States | 501-1,000 | Exact match | 851 contacts → |
“Argo Group is a U.S-focused underwriter of specialty insurance products in the property and casualty market.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | HQ: Wilkes-barre, PA, United StatesReported employees: 1,001-5,000 | Wilkes-barre, PA, United States | 1,001-5,000 | Exact match | 843 contacts → |
“Rated A+ Superior by AM Best (as of 8/13/25), Berkshire Hathaway GUARD Insurance Companies provides Property & Casualty insurance including Excess & Surplus lines.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 |  Msig USAmsigusa.comHQ: New York, NY, United StatesReported employees: 201-500 | New York, NY, United States | 201-500 | Exact match | 693 contacts → |
“MSIG USA is the partner that businesses rely on for creative, customized insurance solutions.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 683 company matches
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Reinsurance underwriting companies: dataset insights
September 16, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
681 records in the displayed employee bands.
2 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
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 683 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: September 16, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Questions about this company list
What does Exact match mean for reinsurance underwriting companies?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many reinsurance underwriting companies did RevenueBase find based in the United States?
The saved snapshot records 683 matching company records, 181,199 tracked contacts and 84,434 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: September 16, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
Related lists
Reinsurance underwriting companies by geography
- Reinsurance underwriting companies based in Argentina
- Reinsurance underwriting companies based in Australia
- Reinsurance underwriting companies based in Bermuda
- Reinsurance underwriting companies based in Brazil
- Reinsurance underwriting companies based in Canada
- Reinsurance underwriting companies based in France
- Reinsurance underwriting companies based in Germany
- Reinsurance underwriting companies based in India
- Reinsurance underwriting companies based in Italy
- Reinsurance underwriting companies based in Mexico
- Reinsurance underwriting companies based in the Netherlands
- Reinsurance underwriting companies based in South Africa
Cite this list
RevenueBase Data Team. Top 25 reinsurance underwriting companies based in the United States. Snapshot: September 16, 2026. https://revenuebase.ai/companies/reinsurance-underwriting-companies/united-states.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Reinsurance underwriting companies based in Argentina
- Reinsurance underwriting companies based in Australia
- Reinsurance underwriting companies based in Bermuda
- Reinsurance underwriting companies based in Brazil
- Reinsurance underwriting companies based in Canada
- Reinsurance underwriting companies based in France
Company intelligence · public preview
Top 25 reinsurance underwriting companies based in the United States
RevenueBase records 683 matching company records for reinsurance underwriting companies based in the United States, with 181,199 tracked contacts and 84,434 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: September 16, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 reinsurance underwriting companies based in the United States
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 | Liberty Mutual Insurancelibertymutualgroup.com HQ: Boston, MA, United StatesReported employees: 10001+ | Boston, MA, United States | 10001+ | Exact match | 30,330 contacts → |
“At Liberty Mutual, we believe progress happens when people feel secure.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | AIGaig.com HQ: New York, NY, United StatesReported employees: 10001+ | New York, NY, United States | 10001+ | Exact match | 23,438 contacts → |
“American International Group, Inc.(NYSE: AIG) is a leading global insurance organization.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | FMfm.com HQ: Johnston, RI, United StatesReported employees: 5,001-10,000 | Johnston, RI, United States | 5,001-10,000 | Exact match | 6,351 contacts → |
“For nearly 200 years, FM has empowered businesses worldwide to manage risk, prevent loss, and build resilience.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | Amwinsamwins.com HQ: Charlotte, NC, United StatesReported employees: 5,001-10,000 | Charlotte, NC, United States | 5,001-10,000 | Exact match | 4,926 contacts → |
“Amwins is the largest wholesale distributor of specialty insurance products and services in the U.S.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | HQ: Chesterfield, MO, United StatesReported employees: 1,001-5,000 | Chesterfield, MO, United States | 1,001-5,000 | Exact match | 4,128 contacts → |
“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 description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | GUY Carpenterguycarp.com HQ: New York, NY, United StatesReported employees: 1,001-5,000 | New York, NY, United States | 1,001-5,000 | Exact match | 4,072 contacts → |
“At Guy Carpenter, a Marsh business, we deliver a powerful combination of (re)insurance broking expertise, capital solutions, global analytics, advisory, and client support…” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | Sentrylink.sentry.com HQ: Stevens Point, WI, United StatesReported employees: 5,001-10,000 | Stevens Point, WI, United States | 5,001-10,000 | Exact match | 3,963 contacts → |
“Sentry Insurance got its start in 1904, when members of the Wisconsin Retail Hardware Association formed their own insurance company.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Everesteverestglobal.com HQ: Warren, NJ, United StatesReported employees: 1,001-5,000 | Warren, NJ, United States | 1,001-5,000 | Exact match | 3,411 contacts → |
“Everest Group, Ltd.(“Everest”) is a global underwriting leader providing best-in-class property, casualty, and specialty reinsurance and insurance solutions that address…” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | Markelmarkel.com HQ: Glen Allen, VA, United StatesReported employees: 1,001-5,000 | Glen Allen, VA, United States | 1,001-5,000 | Exact match | 3,151 contacts → |
“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 description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | Mcgriffmcgriff.com HQ: Charlotte, NC, United StatesReported employees: 1,001-5,000 | Charlotte, NC, United States | 1,001-5,000 | Exact match | 3,021 contacts → |
“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.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | RT Specialtyrtspecialty.com HQ: Chicago, IL, United StatesReported employees: 1,001-5,000 | Chicago, IL, United States | 1,001-5,000 | Exact match | 2,955 contacts → |
“RT Specialty is a leading wholesale distributor of specialty insurance products and services and the wholesale broking specialty for Ryan Specialty.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | Crum & Forstercfins.com HQ: Morristown, NJ, United StatesReported employees: 1,001-5,000 | Morristown, NJ, United States | 1,001-5,000 | Exact match | 2,105 contacts → |
“Crum & Forster (C&F) provides market leading property & casualty, accident & health, specialty and standard commercial lines insurance solutions.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | Tokio Marine HCCtmhcc.com HQ: Houston, TX, United StatesReported employees: 1,001-5,000 | Houston, TX, United States | 1,001-5,000 | Exact match | 2,006 contacts → |
“Tokio Marine HCC focuses on what matters most; our people.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | QBE North Americaqbe.com HQ: New York, NY, United StatesReported employees: 10001+ | New York, NY, United States | 10001+ | Exact match | 1,883 contacts → |
“At QBE we’re driven by our purpose of enabling a more resilient future.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Berkshire Hathaway Specialty Insurancebhspecialty.com HQ: Boston, MA, United StatesReported employees: 1,001-5,000 | Boston, MA, United States | 1,001-5,000 | Exact match | 1,799 contacts → |
“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…” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | GEN REgenre.com HQ: Stamford, CT, United StatesReported employees: 1,001-5,000 | Stamford, CT, United States | 1,001-5,000 | Exact match | 1,542 contacts → |
“Gen Re is a leading property/casualty and life/health reinsurance company.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | RLI Insurance Companyrlicorp.com HQ: Peoria, IL, United StatesReported employees: 1,001-5,000 | Peoria, IL, United States | 1,001-5,000 | Exact match | 1,386 contacts → |
“RLI is a U.S-based specialty insurer that serves niche property, casualty and surety markets.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Radianradian.com HQ: Wayne, PA, United StatesReported employees: 1,001-5,000 | Wayne, PA, United States | 1,001-5,000 | Exact match | 1,262 contacts → |
“Radian Group Inc.(NYSE: RDN) is a trusted, global multi-line specialty insurer, built to empower confident business decisions around the world.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | ISOverisk.com HQ: Jersey City, NJ, United StatesReported employees: 5,001-10,000 | Jersey City, NJ, United States | 5,001-10,000 | Exact match | 1,097 contacts → |
“Underwriting solutions at Verisk is a leading provider of advanced tools and analytics for the property/casualty and life insurance industries.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | Ryan Specialtyryanspecialty.com HQ: Chicago, IL, United StatesReported employees: 5,001-10,000 | Chicago, IL, United States | 5,001-10,000 | Exact match | 1,079 contacts → |
“Ryan Specialty (NYSE: RYAN) is an international specialty insurance firm that provides distribution, underwriting, product development, administration and risk management services…” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Safety Nationalsafetynational.com HQ: St. Louis, MO, United StatesReported employees: 501-1,000 | St. Louis, MO, United States | 501-1,000 | Exact match | 1,008 contacts → |
“Safety National is a leading specialty insurance and reinsurance provider.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | HRHwillis.com HQ: Radnor, PA, United StatesReported employees: 1,001-5,000 | Radnor, PA, United States | 1,001-5,000 | Exact match | 930 contacts → |
“Willis Group Holdings plc is a leading global insurance broker.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | Argo Groupargogroup.com HQ: New York, NY, United StatesReported employees: 501-1,000 | New York, NY, United States | 501-1,000 | Exact match | 851 contacts → |
“Argo Group is a U.S-focused underwriter of specialty insurance products in the property and casualty market.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | HQ: Wilkes-barre, PA, United StatesReported employees: 1,001-5,000 | Wilkes-barre, PA, United States | 1,001-5,000 | Exact match | 843 contacts → |
“Rated A+ Superior by AM Best (as of 8/13/25), Berkshire Hathaway GUARD Insurance Companies provides Property & Casualty insurance including Excess & Surplus lines.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | Msig USAmsigusa.com HQ: New York, NY, United StatesReported employees: 201-500 | New York, NY, United States | 201-500 | Exact match | 693 contacts → |
“MSIG USA is the partner that businesses rely on for creative, customized insurance solutions.” Recorded description excerpt · September 16, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 683 company matches
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Reinsurance underwriting companies: dataset insights
September 16, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
681 records in the displayed employee bands.
2 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
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 683 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: September 16, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Questions about this company list
What does Exact match mean for reinsurance underwriting companies?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many reinsurance underwriting companies did RevenueBase find based in the United States?
The saved snapshot records 683 matching company records, 181,199 tracked contacts and 84,434 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: September 16, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
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Cite this list
RevenueBase Data Team. Top 25 reinsurance underwriting companies based in the United States. Snapshot: September 16, 2026. https://revenuebase.ai/companies/reinsurance-underwriting-companies/united-states.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
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- Reinsurance underwriting companies based in Argentina
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