Company lists · Data refreshed September 2026
Top 25 Umbrella insurance underwriters worldwide
RevenueBase identified 193 umbrella insurance underwriters worldwide as of September 2026 and tracks 2,839 professional contacts across them, including 1,178 with verified work emails and 0 with mobile numbers. The United States is the largest market and London the largest hub.
This list covers umbrella insurance 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 19, 2026. Country and city lists for umbrella insurance 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 umbrella insurance underwriters worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 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 19, 2026Thanks. The Data Team will review it. | |||||
| 2 | 245 contacts → | ||||
Strong evidence “As a division of Ryan Specialty Underwriting Managers, US Assure distributes, underwrites and services construction and property insurance products across the U.S.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 3 | 173 contacts → | ||||
Indirect evidence “DUAL is driven by a mission to be the MGA of choice for brokers, clients and carriers, through the provision of deep underwriting expertise and global distribution.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 4 | 110 contacts → | ||||
Partial 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 19, 2026Thanks. The Data Team will review it. | |||||
| 5 | 71 contacts → | ||||
Indirect evidence “Cochrane & Company was established in 1960 in Spokane, Washington.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 6 | 51 contacts → | ||||
Partial evidence “Shoff Darby Insurance Agency offers a variety of insurance products to meet the diverse needs of both our Personal and Commerical customers.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 7 | 46 contacts → | ||||
Partial evidence “Berkley Financial Specialists is dedicated to providing customized, comprehensive insurance solutions and outstanding personalized service to financial institutions and insurance…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 8 | 44 contacts → | ||||
Indirect evidence “Our model is built around underwriting excellence, driven by rigorous risk selection, innovative, intelligent underwriting and catastrophe modelling.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 9 | 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 19, 2026Thanks. The Data Team will review it. | |||||
| 10 | 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 19, 2026Thanks. The Data Team will review it. | |||||
| 11 | 42 contacts → | ||||
Indirect evidence “Our history dates back to the early 1990’s, when Maritime General Agency and Marine MGA were founded.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 12 | 37 contacts → | ||||
Indirect evidence “Medical & Commercial International (MCI) specialises in underwriting international liability risks.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 13 | 33 contacts → | ||||
Partial evidence “We are a Managing General Underwriter (MGU) company providing high limits and innovative products to our clients.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 14 | 31 contacts → | ||||
Strong evidence “Barbican Insurance Group underwrites business predominantly through our syndicates at Lloyd’s.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 15 | 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 19, 2026Thanks. The Data Team will review it. | |||||
| 16 | 26 contacts → | ||||
Partial evidence “Risman Insurance Agencies is based in Massachusetts with multiple offices across the state.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 17 | 25 contacts → | ||||
Partial evidence “Navium started trading in May 2021 and was formed as a result of a partnership between Clive Washbourn (CEO), Pine Walk Capital Limited, and Fidelis Insurance Holdings Limited.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 18 | 24 contacts → | ||||
Partial evidence “Since 1993, Triton has been providing Homeowners insurance, Auto insurance, Boat insurance, Business & Liability insurance, Workers’ Compensation insurance, Flood Insurance…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 19 | 20 contacts → | ||||
Partial evidence “Alta Risk is an underwriting manager for specialty insurance products.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 20 | 19 contacts → | ||||
Strong evidence “Simply stated, RT Binding Authority’s underwriters are here to provide a solution to your clients’ insurance needs.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 21 | 17 contacts → | ||||
Partial evidence “Welcome to Monoline, where we’re igniting a new chapter in personal insurance wholesaling.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 22 | 15 contacts → | ||||
Strong evidence “Provider of online standalone personal umbrella insurance policies, Admitted, rated A XV by A.M.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 23 | 15 contacts → | ||||
Partial evidence “Property and Casualty insurance.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 24 | 14 contacts → | ||||
Partial evidence “Incorporated Insurance Group Limited aims to be recognised as one of the leading underwriting agencies in the UK.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 25 | 14 contacts → | ||||
Strong evidence “Bellingham Underwriters, a Division of Arrowhead General Insurance Agency, Inc.” Source: RevenueBase Database · checked Sep 19, 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: umbrella 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 umbrella insurance underwriters.
- Partial evidence
- Its own public description names part of umbrella insurance underwriters, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name umbrella 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 193 umbrella insurance underwriters worldwide
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Umbrella insurance underwriters worldwide at a glance
As of Sep 19, 2026Companies by employee count
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 umbrella 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.
- Coverage
- 2 countries, largest first: the United States, the United Kingdom. Country and city lists for umbrella insurance underwriters are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “umbrella 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 umbrella 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 umbrella insurance 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, 1,178 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 19, 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.
Umbrella insurance underwriters by location
2 lists · largest firstEvery Umbrella insurance underwriters list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
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 umbrella 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 umbrella insurance underwriters are there worldwide?
RevenueBase identified 193 umbrella insurance 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?
Atlantic Casualty Insurance CO, headquartered in Goldsboro, tops this list with the largest team on record.
Which country has the most umbrella insurance underwriters?
The United States leads with 167 companies, followed by the United Kingdom (26). Every umbrella insurance underwriters list by country and city is linked on this page.
Which city has the most umbrella insurance underwriters?
London leads with 17 headquartered companies, followed by Houston (6) and Austin (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 1,178 verified decision-maker contacts tracked across these 193 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 19, 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.