Company lists · Data refreshed September 2026
Top 25 Insurance underwriting firms based in the United States
RevenueBase identified 157 insurance underwriting firms headquartered in the United States as of September 2026 and tracks 31,206 professional contacts across them, including 12,896 with verified work emails. New York is the largest hub.
This list covers insurance underwriting firms 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.
The 25 largest insurance underwriting firms based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 8,988 contacts → | ||||
Partial evidence “Zurich North America is one of the largest providers of insurance solutions and services to businesses and individuals.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 2 | 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, 2026Thanks. The Data Team will review it. | |||||
| 3 | 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, 2026Thanks. The Data Team will review it. | |||||
| 4 | 1,314 contacts → | ||||
Strong evidence “We aspire to be the very best insurance company at underwriting insurance products for our customers.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 5 | 1,097 contacts → | ||||
Strong 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, 2026Thanks. The Data Team will review it. | |||||
| 6 | 851 contacts → | ||||
Partial evidence “Argo Group is a U.S-focused underwriter of specialty insurance products in the property and casualty market.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 7 | 680 contacts → | ||||
Partial 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, 2026Thanks. The Data Team will review it. | |||||
| 8 | 553 contacts → | ||||
Indirect evidence “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.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 9 | 363 contacts → | ||||
Partial evidence “Founded in 2014, by a team with deep experience across underwriting, analytics, reinsurance and capital markets, Palomar is an innovative specialty insurer serving residential and…” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 10 | 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, 2026Thanks. The Data Team will review it. | |||||
| 11 | 235 contacts → | ||||
Partial evidence “For more than a century, Pharmacists Mutual has been providing specialized insurance solutions backed by solid industry insight.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 12 | 229 contacts → | ||||
Partial evidence “ONEGROUP is a leader in risk management, insurance and business solutions.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 13 | 191 contacts → | ||||
Indirect evidence “McNeil & Co.| We Are Who We Insure McNeil & Co.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 14 | 162 contacts → | ||||
Strong evidence “JMI Reports provides its more than 150 insurance carrier and broker clients with underwriting risk data and property risk profiles that allow for better decision making…” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 15 | 127 contacts → | ||||
Partial evidence “Tokio Marine HCC – Cyber & Professional Lines Group (CPLG) is a specialty insurance provider.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 16 | 110 contacts → | ||||
Strong evidence “Verus Specialty Insurance is an underwriting management company targeting small to midsize commercial risks in the E&S and Specialty insurance markets through appointed wholesale…” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 17 | 105 contacts → | ||||
Strong evidence “Risk Theory provides nationwide insurance programs which incorporate dynamic coverages, features, and flexible underwriting with dependable, and reasonably priced coverage.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 18 | 99 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 19 | 87 contacts → | ||||
Partial evidence “Wellington Insurance Group is a Texas-based risk distribution and financial services organization specializing in the delivery and administration of residential property insurance.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 20 | 87 contacts → | ||||
Strong evidence “IRSi offers a full range of insurance inspection services and field underwriting support aimed at delivering you all the information you need to make informed decisions.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 21 | 76 contacts → | ||||
Partial evidence “Falcon Risk Services, an HDI Company, is a provider of specialty underwriting and claims solutions to US and multinational corporations.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 22 | 71 contacts → | ||||
Indirect evidence “Cochrane & Company was established in 1960 in Spokane, Washington.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 23 | 70 contacts → | ||||
Indirect evidence “Our industry-leading, 95-percent client retention rate is a reflection of our people and our approach.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 24 | 57 contacts → | ||||
Partial evidence “Bradley & Parker is a premier insurance, risk management and financial services firm headquartered in Melville, NY, the business hub of Long Island.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 25 | 54 contacts → | ||||
Partial evidence “Sixfold is the AI brain behind better underwriting.” Source: RevenueBase Database · checked Sep 17, 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: insurance underwriting firms. 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 underwriting firms.
- Partial evidence
- Its own public description names part of insurance underwriting firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name insurance underwriting firms. 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 157 insurance underwriting firms based in the United States
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Insurance underwriting firms based in the United States at a glance
As of Sep 17, 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 157 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 underwriting firms, 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 underwriting firms”. 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 underwriting firms), 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 underwriting firms, 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, 12,896 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.
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 underwriting firms, 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 underwriting firms are there based in the United States?
RevenueBase identified 157 insurance underwriting firms 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?
Zurich North America, headquartered in Schaumburg, tops this list with the largest team on record.
Which city has the most insurance underwriting firms?
New York leads with 11 headquartered companies, followed by Houston (5) and Miami (4).
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 12,896 verified decision-maker contacts tracked across these 157 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.
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