Company lists · Data refreshed September 2026
Top 25 Marine underwriters worldwide
RevenueBase identified 2,217 marine underwriters worldwide as of September 2026 and tracks 57,161 professional contacts across them, including 20,042 with verified work emails. The United States is the largest market and London the largest hub.
This list covers marine underwriters worldwide, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 20, 2026. Country and city lists for marine underwriters follow the table.
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 underwriters worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 3,411 contacts → | ||||
Indirect evidence “Everest Group, Ltd.(“Everest”) is a global underwriting leader providing best-in-class property, casualty, and specialty reinsurance and insurance solutions that address…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 2 | 3,040 contacts → | ||||
Indirect evidence “When you look at Amica, you’ll see we’re different.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 3 | 2,564 contacts → | ||||
Indirect evidence “We are a specialty insurer with more than three decades of experience in providing clients with the highest standards of underwriting and claims service worldwide.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 4 | 2,185 contacts → | ||||
Strong evidence “Philadelphia Insurance Companies, a member of the Tokio Marine Group, designs, markets and underwrites commercial property/casualty and professional liability insurance products…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 5 | 1,844 contacts → | ||||
Indirect evidence “Sompo Seguros S.A is a subsidiary of Sompo International, the company responsible for the insurance and reinsurance operations of the Sompo Holdings Group outside Japan.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 6 | 1,703 contacts → | ||||
Indirect evidence “WARTA Insurance and Reinsurance Company maintains a steady position as the second largest insurer on the market.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 7 | 1,343 contacts → | ||||
Indirect evidence “At QBE we’re driven by our purpose of enabling a more resilient future.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 8 | 1,201 contacts → | ||||
Indirect evidence “We are a specialist insurer and reinsurer with a 100-year record of helping clients navigate the world’s most complex and demanding risks.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 9 | 1,113 contacts → | ||||
Indirect evidence “American Modern provides insurance solutions for customers who need coverage not readily found in the general market.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 10 | 877 contacts → | ||||
Indirect evidence “SageSure is building the world’s leading catastrophe-risk franchise.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 11 | 652 contacts → | ||||
Indirect evidence “Specialist commercial insurer and reinsurer, underwriting a diversified portfolio of specialty lines.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 12 | 635 contacts → | ||||
Partial 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 20, 2026Thanks. The Data Team will review it. | |||||
| 13 | 633 contacts → | ||||
Partial evidence “Gard is a shipowner-controlled provider of P&I, marine and energy insurance products.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 14 | 584 contacts → | ||||
Indirect evidence “The home of NorthStandard updates.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 15 | 574 contacts → | ||||
Partial evidence “SiriusPoint is a global underwriter of insurance and reinsurance providing solutions to clients and brokers around the world.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 16 | 569 contacts → | ||||
Partial evidence “Mitsui Sumitomo Insurance Company, Limited ("MSI") was formed in October 2001 through a merger between the former Mitsui Marine & Fire Insurance Co, Ltd.("Mitsui Marine") and the…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 17 | 532 contacts → | ||||
Partial evidence “Assureur spécialiste des risques d'entreprise • 1er Assureur Maritime et Transport en France • + de 510 collaborateurs | Top Employer 2026 • CA de 580 millions d'euros en 2025 •…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 18 | 501 contacts → | ||||
Indirect evidence “A FF Seguros é parte do Grupo Fairfax Financial Holdings, com sede no Canadá e presença global há mais de 35 anos.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 19 | 494 contacts → | ||||
Indirect evidence “As an MGA, we offer a great deal of specialty products with professional service.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 20 | 449 contacts → | ||||
Indirect evidence “At SSY, we believe that experience matters.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 21 | 430 contacts → | ||||
Indirect evidence “Bracht Deckers & Mackelbert NV (BDM), opgericht in 1934, is één van de meest gevestigde en gerespecteerde gevolmachtigde onderschrijvers in de Benelux-regio.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 22 | 419 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 23 | 388 contacts → | ||||
Indirect evidence “Ингосстрах» работает на международном и внутреннем рынках с 1947 года.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 24 | 386 contacts → | ||||
Indirect evidence “ALDAGI was the first insurance company to be founded in the Georgian market in 1990.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 25 | 378 contacts → | ||||
Indirect evidence “AS OF MARCH 28, 2017, ENDURANCE SPECIALTY HOLDINGS LTD.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: marine 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 marine underwriters.
- Partial evidence
- Its own public description names part of marine underwriters, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name marine 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 2,217 marine underwriters worldwide
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Marine underwriters worldwide at a glance
As of Sep 20, 2026Companies by employee count
Email recency is reported on each country list linked below.
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 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.
- Coverage
- Every country. Country and city lists for marine underwriters are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “marine 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 marine 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 marine underwriters, and records with no verified work email.
- 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, 20,042 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 20, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Marine underwriters by location
16 lists · largest firstEvery Marine underwriters list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Marine underwriters based in the United States423
- Marine underwriters based in the United Kingdom295
- Marine underwriters based in Germany67
- Marine underwriters based in Australia66
- Marine underwriters based in Brazil63
- Marine underwriters based in Türkiye53
- Marine underwriters based in Greece50
- Marine underwriters based in the Netherlands49
- Marine underwriters based in Canada48
- Marine underwriters based in France48
- Marine underwriters based in the United Arab Emirates47
- Marine underwriters based in Italy46
- Marine underwriters based in South Africa37
- Marine underwriters based in Malaysia29
- Marine underwriters based in Belgium27
- Marine underwriters based in Norway26
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 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 marine underwriters are there worldwide?
RevenueBase identified 2,217 marine underwriters worldwide 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?
Everest, headquartered in Warren, tops this list with the largest team on record.
Which country has the most marine underwriters?
The United States leads with 423 companies, followed by the United Kingdom (295) and Germany (67). Every marine underwriters list by country and city is linked on this page.
Which city has the most marine underwriters?
London leads with 120 headquartered companies, followed by Hamburg (33) and Singapore (32).
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 20,042 verified decision-maker contacts tracked across these 2,217 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 20, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.