Who writes ocean 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 ocean marine in Washington in 2025: STARR INDEMNITY \u0026 LIABILITY COMPANY led with 33.5% of the state's premium; the top five hold 54%.
By Sam Alishahi, independent insurance broker · All lines in Washington
The companies
| # | Company | NAIC | Home state | Status here | Premium | Share |
|---|---|---|---|---|---|---|
| 1 | STARR INDEMNITY \u0026 LIABILITY COMPANY | 38318 | TX | Admitted (licensed) | $79.5M | 33.45% |
| 2 | Travelers Property Casualty Company of America | 25674 | CT | Admitted (licensed) | $15.4M | 6.50% |
| 3 | National Union Fire Insurance Company of Pittsburgh, Pennsylvania | 19445 | PA | Admitted (licensed) | $11.9M | 5.01% |
| 4 | Zurich American Insurance Company | 16535 | NY | Admitted (licensed) | $11.9M | 4.99% |
| 5 | Navigators Insurance Company | 42307 | NY | Admitted (licensed) | $10.6M | 4.46% |
| 6 | Markel American Insurance Company | 28932 | VA | Admitted (licensed) | $9.2M | 3.87% |
| 7 | Federal Insurance Company | 20281 | IN | Admitted (licensed) | $9.0M | 3.77% |
| 8 | Atlantic Specialty Insurance Company | 27154 | NY | Admitted (licensed) | $8.4M | 3.53% |
| 9 | Endurance American Insurance Company | 10641 | DE | Admitted (licensed) | $8.3M | 3.50% |
| 10 | Great American Insurance Company | 16691 | OH | Admitted (licensed) | $6.0M | 2.51% |
| 11 | StarStone National Insurance Company | 25496 | DE | Admitted (licensed) | $4.8M | 2.04% |
| 12 | Liberty Mutual Insurance Company | 23043 | MA | Admitted (licensed) | $4.7M | 1.98% |
| 13 | Continental Insurance Company, (The) | 35289 | PA | Admitted (licensed) | $4.3M | 1.80% |
| 14 | Ace American Insurance Company | 22667 | PA | Admitted (licensed) | $4.2M | 1.77% |
| 15 | Standard Fire Insurance Company (The) | 19070 | CT | Admitted (licensed) | $4.0M | 1.67% |
| 16 | Ascot Insurance Company | 23752 | CO | Admitted (licensed) | $3.8M | 1.61% |
| 17 | Hanover Insurance Company (The) | 22292 | NH | Admitted (licensed) | $3.7M | 1.57% |
| 18 | Stratford Insurance Company | 40436 | NH | Admitted (licensed) | $3.6M | 1.51% |
| 19 | AIG Property Casualty Company | 19402 | IL | Admitted (licensed) | $3.5M | 1.48% |
| 20 | Red Shield Insurance Company | 41580 | WA | Admitted (licensed) | $3.1M | 1.30% |
| 21 | Aspen American Insurance Company | 43460 | TX | Admitted (licensed) | $2.5M | 1.07% |
| 22 | Beazley Insurance Company, Inc. | 37540 | CT | Admitted (licensed) | $2.5M | 1.06% |
| 23 | Foremost Insurance Company Grand Rapids, Michigan | 11185 | MI | Admitted (licensed) | $2.4M | 1.02% |
| 24 | AXIS Insurance Company | 37273 | IL | Admitted (licensed) | $2.3M | 0.98% |
| 25 | Swiss Re Corporate Solutions America Insurance Corporation | 29874 | MO | Admitted (licensed) | $1.9M | 0.81% |
| 26 | XL Specialty Insurance Company | 37885 | DE | Admitted (licensed) | $1.9M | 0.79% |
| 27 | New York Marine and General Insurance Company | 16608 | NY | Admitted (licensed) | $1.8M | 0.74% |
| 28 | StarNet Insurance Company | 40045 | IA | Admitted (licensed) | $1.6M | 0.68% |
| 29 | U.S. Specialty Insurance Company | 29599 | TX | Admitted (licensed) | $1.6M | 0.67% |
| 30 | National Casualty Company | 11991 | OH | Admitted (licensed) | $1.2M | 0.53% |
| 31 | Mitsui Sumitomo Insurance USA Inc. | 22551 | NY | Admitted (licensed) | $1.1M | 0.46% |
| 32 | Accelerant National Insurance Company | 10220 | AR | Admitted (licensed) | $1.0M | 0.43% |
| 33 | Argonaut Insurance Company | 19801 | NE | Admitted (licensed) | $989,000 | 0.42% |
| 34 | Sutton National Insurance Company | 25798 | OK | Admitted (licensed) | $971,000 | 0.41% |
| 35 | Indemnity Insurance Company of North America | 43575 | PA | Admitted (licensed) | $913,000 | 0.38% |
| 36 | RLI Insurance Company | 13056 | IL | Admitted (licensed) | $818,000 | 0.34% |
| 37 | SAMSUNG FIRE \u0026 MARINE INSURANCE CO., LTD. (U.S. BRANCH) | 38300 | NY | Admitted (licensed) | $752,000 | 0.32% |
| 38 | Travelers Home and Marine Insurance Company (The) | 27998 | CT | Admitted (licensed) | $661,000 | 0.28% |
| 39 | AGCS Marine Insurance Company | 22837 | IL | Admitted (licensed) | $589,000 | 0.25% |
| 40 | GEICO Marine Insurance Company | 37923 | NE | Admitted (licensed) | $12,000 | 0.01% |
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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