Company lists · Data refreshed September 2026
Top 25 Primary insurance underwriters based in the United States
RevenueBase identified 149 primary insurance underwriters headquartered in the United States as of September 2026 and tracks 82,279 professional contacts across them, including 35,154 with verified work emails. Miami is the largest hub.
This list covers primary insurance underwriters 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 primary insurance underwriters based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 32,682 contacts → | ||||
Partial evidence “Travelers provides insurance coverage to protect the things that are important to you – your home, your car, your valuables and your business.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 2 | 30,330 contacts → | ||||
Indirect evidence “At Liberty Mutual, we believe progress happens when people feel secure.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 3 | 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. | |||||
| 4 | 3,186 contacts → | ||||
Indirect evidence “At Mercury, we have been guided by our purpose to help people reduce risk and overcome unexpected events for more than 60 years.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 5 | 2,105 contacts → | ||||
Partial evidence “Crum & Forster (C&F) provides market leading property & casualty, accident & health, specialty and standard commercial lines insurance solutions.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 6 | 1,314 contacts → | ||||
Partial 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. | |||||
| 7 | 348 contacts → | ||||
Indirect evidence “Tokio Marine has been conducting business in the U.S.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 8 | 335 contacts → | ||||
Strong 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. | |||||
| 9 | 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. | |||||
| 10 | 188 contacts → | ||||
Indirect evidence “HUB offers property and casualty, life and health, employee benefits & risk management solutions.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 11 | 132 contacts → | ||||
Indirect evidence “Cypress Property & Casualty has provided our policyholders and agents with a long-term, stable market of products and services to meet the needs of home and business owners for…” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 12 | 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. | |||||
| 13 | 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. | |||||
| 14 | 53 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 15 | 49 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 16 | 49 contacts → | ||||
Strong evidence “Universal Fire & Casualty Insurance Company (UFCIC) currently underwrites commercial property, general liability, business owner’s package (BOP), commercial multi-peril (CMP), and…” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 17 | 44 contacts → | ||||
Indirect evidence “Deans & Homer was established in 1856 and is one of the oldest continuously operating companies in California.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 18 | 42 contacts → | ||||
Partial evidence “We are a professional insurance underwriting management company specializing in Commercial Automobile, Commercial General Liability, Commercial Property, Inland Marine and Garage…” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 19 | 40 contacts → | ||||
Partial evidence “Since 1972, Whorton Insurance has stood for strong business principles: Providing consistent financial stability for its customers - locally, nationally and globally.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 20 | 28 contacts → | ||||
Partial evidence “First Insurance Group has been providing insurance and risk management solutions since 1928 and has grown to become one of the premier agencies in South-Central Indiana.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 21 | 28 contacts → | ||||
Partial evidence “At GIC Underwriters our success is based on 30 years of superior service, conservative underwriting and commitment to meeting the needs of our producers.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 22 | 22 contacts → | ||||
Partial evidence “An Experienced Team of Industry Experts: As one of the largest, independently owned insurance firms in the region, TriSure helps the area’s leading businesses successfully manage…” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 23 | 22 contacts → | ||||
Indirect evidence “We support your life underwriting needs during your peak times, vacation schedules, year- end, back logs, new sales implementations and project studies.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 24 | 20 contacts → | ||||
Indirect evidence “Headquartered in Virginia Beach, Beskin and Associates, Inc.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 25 | 20 contacts → | ||||
Partial evidence “The Gallen Group offers a unique and different style of products and services from your traditional insurance agency.” 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: primary insurance underwriters. 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 primary insurance underwriters.
- Partial evidence
- Its own public description names part of primary insurance underwriters, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name primary insurance underwriters. 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 149 primary insurance underwriters based in the United States
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Primary insurance underwriters 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 149 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 primary insurance underwriters, 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 “primary insurance underwriters”. 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 primary insurance underwriters), 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 primary insurance underwriters, 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, 35,154 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 primary insurance underwriters, 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 primary insurance underwriters are there based in the United States?
RevenueBase identified 149 primary insurance underwriters 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?
Travelers, headquartered in New York, tops this list with the largest team on record.
Which city has the most primary insurance underwriters?
Miami leads with 4 headquartered companies, followed by Houston (3) and Jacksonville (3).
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 35,154 verified decision-maker contacts tracked across these 149 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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