Who writes inland marine in Washington
The 40 largest writers by premium in 2025 from the Washington Office of the Insurance Commissioner and the Surplus Line Association of Washington market report (a top-40 list, shares of earned premium).
The 40 largest writers of inland marine in Washington in 2025: Liberty Insurance Underwriters, Inc. led with 13.8% of the state's premium; the top five hold 45%.
By Sam Alishahi, independent insurance broker · All lines in Washington
The companies
| # | Company | NAIC | Home state | Status here | Premium | Share |
|---|---|---|---|---|---|---|
| 1 | Liberty Insurance Underwriters, Inc. | 19917 | IL | Admitted (licensed) | $77.7M | 13.85% |
| 2 | Jefferson Insurance Company | 11630 | NY | Admitted (licensed) | $59.5M | 10.62% |
| 3 | National Union Fire Insurance Company of Pittsburgh, Pennsylvania | 19445 | PA | Admitted (licensed) | $50.2M | 8.94% |
| 4 | Continental Casualty Company | 20443 | IL | Admitted (licensed) | $41.8M | 7.45% |
| 5 | Zurich American Insurance Company | 16535 | NY | Admitted (licensed) | $23.5M | 4.20% |
| 6 | State Farm Fire and Casualty Company | 25143 | IL | Admitted (licensed) | $21.6M | 3.85% |
| 7 | American Bankers Insurance Company of Florida | 10111 | FL | Admitted (licensed) | $20.1M | 3.58% |
| 8 | Generali (United States Branch) | 11231 | NY | Admitted (licensed) | $18.2M | 3.25% |
| 9 | Ohio Casualty Insurance Company (The) | 24074 | NH | Admitted (licensed) | $16.9M | 3.01% |
| 10 | United States Fire Insurance Company | 21113 | DE | Admitted (licensed) | $14.4M | 2.56% |
| 11 | AGCS Marine Insurance Company | 22837 | IL | Admitted (licensed) | $13.4M | 2.39% |
| 12 | Travelers Property Casualty Company of America | 25674 | CT | Admitted (licensed) | $12.5M | 2.22% |
| 13 | Factory Mutual Insurance Company | 21482 | RI | Admitted (licensed) | $11.6M | 2.06% |
| 14 | Pennsylvania Manufacturers' Association Insurance Company | 12262 | PA | Admitted (licensed) | $11.4M | 2.03% |
| 15 | Safeco Insurance Company of America | 24740 | NH | Admitted (licensed) | $11.1M | 1.98% |
| 16 | American Zurich Insurance Company | 40142 | IL | Admitted (licensed) | $10.6M | 1.89% |
| 17 | STARR INDEMNITY \u0026 LIABILITY COMPANY | 38318 | TX | Admitted (licensed) | $10.5M | 1.87% |
| 18 | Ace American Insurance Company | 22667 | PA | Admitted (licensed) | $10.2M | 1.83% |
| 19 | Affiliated F M Insurance Company | 10014 | RI | Admitted (licensed) | $9.0M | 1.61% |
| 20 | Arch Insurance (UK) Limited | 11150 | MO | Admitted (licensed) | $8.8M | 1.56% |
| 21 | Great West Casualty Company | 11371 | NE | Admitted (licensed) | $8.7M | 1.56% |
| 22 | United Financial Casualty Company | 11770 | OH | Admitted (licensed) | $8.1M | 1.45% |
| 23 | Securian Casualty Company | 10054 | MN | Admitted (licensed) | $8.0M | 1.43% |
| 24 | Western National Mutual Insurance Company | 15377 | MN | Admitted (licensed) | $6.9M | 1.23% |
| 25 | New Hampshire Insurance Company | 23841 | IL | Admitted (licensed) | $6.5M | 1.16% |
| 26 | Progressive Direct Insurance Company | 16322 | OH | Admitted (licensed) | $6.2M | 1.11% |
| 27 | Progressive Casualty Insurance Company | 24260 | OH | Admitted (licensed) | $5.9M | 1.05% |
| 28 | Jewelers Mutual Insurance Company, SI | 14354 | WI | Admitted (licensed) | $5.6M | 1.01% |
| 29 | Great Northern Insurance Company | 20303 | IN | Admitted (licensed) | $5.6M | 0.99% |
| 30 | Nationwide Mutual Insurance Company | 23787 | OH | Admitted (licensed) | $5.6M | 0.99% |
| 31 | Cincinnati Insurance Company (The) | 10677 | OH | Admitted (licensed) | $5.5M | 0.98% |
| 32 | GEICO Marine Insurance Company | 37923 | NE | Admitted (licensed) | $4.7M | 0.84% |
| 33 | Privilege Underwriters Reciprocal Exchange, PURE Risk Mgt, Atty-in-Fact | 12873 | FL | Admitted (licensed) | $4.5M | 0.80% |
| 34 | United Services Automobile Association, USAA Reciprocal, Attorney-in-fact | 25941 | TX | Admitted (licensed) | $4.1M | 0.73% |
| 35 | Allstate Property and Casualty Insurance Company | 17230 | IL | Admitted (licensed) | $4.1M | 0.72% |
| 36 | Old Republic Insurance Company | 24147 | PA | Admitted (licensed) | $3.9M | 0.70% |
| 37 | BCS Insurance Company | 38245 | OH | Admitted (licensed) | $3.7M | 0.66% |
| 38 | USAA Casualty Insurance Company | 25968 | TX | Admitted (licensed) | $3.6M | 0.65% |
| 39 | Great American Assurance Company | 26344 | OH | Admitted (licensed) | $3.6M | 0.64% |
| 40 | Allianz Global Risks US Insurance Company | 35300 | IL | Admitted (licensed) | $3.2M | 0.57% |
Method and source
Source: the Washington Office of the Insurance Commissioner and the Surplus Line Association of Washington company list, read 2026-10-17 and the surplus lines list. Washington's authorized list comes from the OIC's 2025 market report (Appendix D), which leaves out authorized companies with no premium that year. Premiums are in thousands. "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.
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