Directory · Montana · Ocean marine

Who writes ocean marine in Montana

Top insurer groups from the NAIC market share report; the state's list carries no lines of authority.

American International Group wrote the most ocean marine in Montana in 2025, $1.4M and 26.5% of the state's premium; the top five groups hold 59%. Montana's company list doesn't say which lines each company is licensed for, so the ranking below is the NAIC's top 10 groups; every licensed company is on the Montana page.

By Sam Alishahi, independent insurance broker · All lines in Montana

Top 10 · NAIC table: 08 - Ocean Marine

The insurer groups that write the most ocean marine in Montana

Top 10 insurer groups by direct premium written in 2025, from the NAIC's Market Share Reports for Property/Casualty Groups and Companies by State. A group is the parent and its insurance companies together; share is the group's part of the state total for the line; loss ratio is losses incurred over premium earned.

#	Insurer group	Premium written	Share	Loss ratio	Member companies here
1	American International Group	$1.4M	26.53%	5%	National Union Fire Insurance Company of Pittsburgh, Pennsylvania, AIG Property Casualty Company, Lexington Insurance Company, AIU Insurance Company
2	Farmers Insurance Group	$607,000	11.86%	30%	Farmers Insurance Exchange, Foremost Insurance Company Grand Rapids, Michigan, Mid-Century Insurance Company, Fire Insurance Exchange Fire Underwriters Association
3	Markel Group	$493,000	9.65%	147%	State National Insurance Company, Inc., Markel Insurance Company, Markel American Insurance Company, Essentia Insurance Company
4	Travelers Group	$307,000	6.01%	12%	Travelers Property Casualty Company of America, Standard Fire Insurance Company (The), Travelers Personal Insurance Company, Travelers Casualty and Surety Company of America
5	Nationwide Corporation Group	$250,000	4.89%	45%	Nationwide Mutual Insurance Company, Nationwide Insurance Company of America, National Casualty Company, Nationwide General Insurance Company
6	Tokio Marine Holdings Inc Group	$244,000	4.77%	—	Philadelphia Indemnity Insurance Company, Privilege Underwriters Reciprocal Exchange, PURE Risk Mgt, Atty-in-Fact, Safety National Casualty Corporation, Producers Agriculture Insurance Company
7	American Financial Group	$223,000	4.36%	17%	Great American Insurance Company, Great American Assurance Company, National Interstate Insurance Company, Great American Alliance Insurance Company
8	Berkshire Hathaway Group	$188,000	3.68%	3%	GEICO General Insurance Company, GEICO Texas County Mutual Insurance Company, GEICO County Mutual Insurance Company, Government Employees Insurance Company
9	Swiss Re Group	$176,000	3.44%	46%	Swiss Re Corporate Solutions Elite Insurance Corporation, Swiss Re Corporate Solutions America Insurance Corporation, Swiss Re Corporate Solutions Capacity Insurance Corporation, Swiss Re Corporate Solutuions Premier Insurance Corporation
10	Liberty Mutual Group	$175,000	3.43%	—	Safeco Insurance Company of America, Liberty Insurance Underwriters, Inc., Liberty Mutual Fire Insurance Company, Liberty County Mutual Insurance Company

Turned down?

Last resort for ocean marine in Montana

Last resort	Lines	Where	How to get in
Surplus lines and Lloyd's open market	all	all states, under each state's diligent-search rules	Through surplus lines wholesalers; commercial property and liability have no guaranteed plan, so this is their last step	Source

Method and source

Source: the Montana insurance regulator company list, read 2026-10-18 and the surplus lines list. Admitted: no static list of admitted/licensed companies is published on csimt.gov (company lookup is one-at-a-time; 2025 annual report has no company appendix) - admitted left empty. Surplus lines: 'Eligible Surplus Lines Companies' XLSX (sheet '10-14-2026') with COMPANY_NAME | NAIC_COCODE | DOMICILE_STATE; no eligibility date given; every row is US-domiciled (no Lloyd's or other alien insurers on this list - alien insurers are not covered by it); alien = domicile not a US state/territory code (raw kept in domicile_raw). csimt.gov Crawl-delay 10 honored. "Premium" is direct premium written in the state for the year shown; "share" is that company's part of the state total for the line. A company can be licensed for a line and write none of it, and a surplus lines insurer can write a line without a state license for it.

Open to use. Cite "Alishahi Insurance insurance company directory" and link here. CSV · JSON.

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