Company lists · Data refreshed September 2026
Top 25 Marine casualty insurance companies based in the United States
RevenueBase identified 116 marine casualty insurance companies headquartered in the United States as of September 2026 and tracks 2,011 professional contacts across them, including 1,071 with verified work emails. Miami is the largest hub.
This list covers marine casualty insurance companies 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 marine casualty insurance companies based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 635 contacts → | ||||
Strong evidence “Core Specialty, through its subsidiary insurers, offers a diversified range of property, casualty, and marine insurance products for small to mid-sized businesses.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 2 | 228 contacts → | ||||
Partial evidence “Falvey Insurance Group is one group with many solutions.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 3 | 159 contacts → | ||||
Indirect evidence “The American Equity Underwriters, Inc.(AEU) delivers specialized coverage and risk management solutions to waterfront employers across the United States.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 4 | 87 contacts → | ||||
Strong evidence “At EIMC, we are the trusted partner for marine insurance and global supply chain communities worldwide.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 5 | 52 contacts → | ||||
Indirect evidence “Founded in New York in 1917, celebrating 106 years of service, the American Club is the only P&I mutual domiciled in the Americas.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 6 | 49 contacts → | ||||
Strong evidence “International Marine Underwriters (IMU) traces its roots to the early 1900s, and offers a full range of ocean and inland marine insurance solutions.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 7 | 48 contacts → | ||||
Strong evidence “Global Marine Insurance Agency, a division of Specialty Program Group LLC provides specialized insurance solutions to boat, yacht and marine business owners.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 8 | 44 contacts → | ||||
Strong evidence “Berkley Offshore is an insurance provider specialising in Energy Upstream, Energy Liability and Marine Insurance.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 9 | 43 contacts → | ||||
Partial evidence “MHG Insurance is a leading insurance brokerage providing insurance advice and solutions for seafarers, businesses and groups and individuals around the world.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 10 | 42 contacts → | ||||
Partial evidence “Our history dates back to the early 1990’s, when Maritime General Agency and Marine MGA were founded.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 11 | 37 contacts → | ||||
Partial evidence “Old Republic Inland Marine is a collaborative team of highly specialized, experienced underwriters with the authority to deliver thoughtful, timely underwriting decisions for…” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 12 | 37 contacts → | ||||
Strong evidence “Supply to our customers in the insurance industry, Reinsurance capacity in ALL MARINE LINES, with an INTEGRAL RISK MANAGEMENT PROGRAM across the entire logistics chain.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 13 | 34 contacts → | ||||
Partial evidence “Founded in 1905, RB Jones is a leader in providing specialty risk coverage solutions to brokers, agents and wholesalers, including: Commercial Marine, Excess Energy, Commercial…” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 14 | 23 contacts → | ||||
Partial evidence “Established in 1978, we are a family run and fourth generation yacht insurance agency with offices in San Diego, Fort Lauderdale, and Kona.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 15 | 18 contacts → | ||||
Strong evidence “Continental Underwriters, Ltd, provides all classes of commercial marine insurance coverages.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 16 | 18 contacts → | ||||
Strong evidence “NBOA Marine Insurance is one of the largest boat insurance agencies in the country.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 17 | 16 contacts → | ||||
Strong evidence “International Special Risks, Inc.(ISR), with offices from Maine to Florida, is the largest Marine intermediary insurance broker on the East Coast.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 18 | 14 contacts → | ||||
Strong evidence “Business and Personal Insurance; Special programs; Wet Marine experts (Yachts, Fish Boats, Charter Boats, marinas, etc); Workers' Compensation placements (all state); Lloyds of…” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 19 | 13 contacts → | ||||
Partial evidence “Seven Seas Insurance Company specializes in cargo insurance.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 20 | 13 contacts → | ||||
Indirect evidence “Nace de la necesidad del mercado logístico internacional, de contar con expertos en el área de riesgos durante el transporte de mercancías alrededor del mundo.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 21 | 11 contacts → | ||||
Strong evidence “With over 100 years of combined seagoing, claims, and technical experience, Independent Maritime Consulting LLC (IMC) provides surveying, claims, and casualty response services to…” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 22 | 10 contacts → | ||||
Strong evidence “AMG Insurance International was established to fill the relationship gap in the marine insurance industry.” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 23 | 8 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 24 | 8 contacts → | ||||
Strong evidence “The American Institute of Marine Underwriters (AIMU) has over 125 years of service as the trade association representing the United States ocean marine insurance industry as an…” Source: RevenueBase Database · checked Sep 17, 2026Thanks. The Data Team will review it. | |||||
| 25 | 7 contacts → | ||||
Partial evidence “Founded in 1989 by Hillary Swiggett, Boater’s Insurance Agency, Inc.(BIA) is a family owned and operated agency that specializes in providing insurance products and services…” 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: marine casualty insurance companies. 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 marine casualty insurance companies.
- Partial evidence
- Its own public description names part of marine casualty insurance companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name marine casualty insurance companies. 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 116 marine casualty insurance companies based in the United States
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Marine casualty insurance companies 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 116 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 marine casualty insurance companies, 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 “marine casualty insurance companies”. 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 marine casualty insurance companies), 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 marine casualty insurance companies, 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, 1,071 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 marine casualty insurance companies, 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 marine casualty insurance companies are there based in the United States?
RevenueBase identified 116 marine casualty insurance companies 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?
Core Specialty Insurance Holdings, INC, headquartered in Cincinnati, tops this list with the largest team on record.
Which city has the most marine casualty insurance companies?
Miami leads with 8 headquartered companies, followed by New York (7) and Houston (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 1,071 verified decision-maker contacts tracked across these 116 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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