Who writes ocean marine in California
Ranked by direct premium written in 2025 from the California Department of Insurance market share report (every company, not a top-N list).
75 companies wrote ocean marine in California in 2025, $506.4M in direct premium. National Union Fire Insurance Company of Pittsburgh, Pennsylvania led with 14.4%; the top five hold 42%.
By Sam Alishahi, independent insurance broker · All lines in California
The companies
| # | Company | NAIC | Home state | Status here | Premium | Share |
|---|---|---|---|---|---|---|
| 1 | National Union Fire Insurance Company of Pittsburgh, Pennsylvania | 19445 | PA | Admitted (licensed) | $72.9M | 14.39% |
| 2 | STARR INDEMNITY \u0026 LIABILITY COMPANY | 38318 | TX | Admitted (licensed) | $43.5M | 8.60% |
| 3 | Navigators Insurance Company | 42307 | NY | Admitted (licensed) | $39.8M | 7.86% |
| 4 | Travelers Property Casualty Company of America | 25674 | CT | Admitted (licensed) | $31.4M | 6.20% |
| 5 | Zurich American Insurance Company | 16535 | NY | Admitted (licensed) | $22.9M | 4.53% |
| 6 | American Bankers Insurance Company of Florida | 10111 | FL | Admitted (licensed) | $22.7M | 4.49% |
| 7 | Continental Insurance Company, (The) | 35289 | PA | Admitted (licensed) | $19.4M | 3.83% |
| 8 | Atlantic Specialty Insurance Company | 27154 | NY | Admitted (licensed) | $18.0M | 3.56% |
| 9 | Great American Insurance Company | 16691 | OH | Admitted (licensed) | $17.4M | 3.43% |
| 10 | Tokio Marine America Insurance Company | 10945 | NY | Admitted (licensed) | $16.4M | 3.23% |
| 11 | Markel American Insurance Company | 28932 | VA | Admitted (licensed) | $14.6M | 2.88% |
| 12 | Ace American Insurance Company | 22667 | PA | Admitted (licensed) | $14.4M | 2.83% |
| 13 | Liberty Mutual Insurance Company | 23043 | MA | Admitted (licensed) | $9.8M | 1.94% |
| 14 | AIG Property Casualty Company | 19402 | IL | Admitted (licensed) | $9.4M | 1.86% |
| 15 | Standard Fire Insurance Company (The) | 19070 | CT | Admitted (licensed) | $8.5M | 1.68% |
| 16 | Ascot Insurance Company | 23752 | CO | Admitted (licensed) | $8.5M | 1.67% |
| 17 | AGCS Marine Insurance Company | 22837 | IL | Admitted (licensed) | $8.4M | 1.67% |
| 18 | Endurance Risk Solutions Assurance Company | 43630 | DE | Admitted (licensed) | $7.6M | 1.50% |
| 19 | Beazley Insurance Company, Inc. | 37540 | CT | Admitted (licensed) | $7.5M | 1.48% |
| 20 | Hanover Insurance Company (The) | 22292 | NH | Admitted (licensed) | $6.9M | 1.36% |
| 21 | National Casualty Company | 11991 | OH | Admitted (licensed) | $6.4M | 1.26% |
| 22 | AXIS Insurance Company | 37273 | IL | Admitted (licensed) | $5.8M | 1.15% |
| 23 | XL Specialty Insurance Company | 37885 | DE | Admitted (licensed) | $5.7M | 1.12% |
| 24 | Mitsui Sumitomo Insurance USA Inc. | 22551 | NY | Admitted (licensed) | $5.2M | 1.02% |
| 25 | QBE Insurance (Europe) Limited | 39217 | PA | Admitted (licensed) | $5.1M | 1.01% |
| 26 | Stratford Insurance Company | 40436 | NH | Admitted (licensed) | $5.0M | 0.99% |
| 27 | Foremost Insurance Company Grand Rapids, Michigan | 11185 | MI | Admitted (licensed) | $5.0M | 0.98% |
| 28 | RLI Insurance Company | 13056 | IL | Admitted (licensed) | $4.8M | 0.94% |
| 29 | SAMSUNG FIRE \u0026 MARINE INSURANCE CO., LTD. (U.S. BRANCH) | 38300 | NY | Admitted (licensed) | $4.6M | 0.91% |
| 30 | Swiss Re Corporate Solutions America Insurance Corporation | 29874 | MO | Admitted (licensed) | $4.3M | 0.86% |
| 31 | Accelerant National Insurance Company | 10220 | AR | Admitted (licensed) | $4.3M | 0.84% |
| 32 | HDI Global Insurance Company | 41343 | IL | Admitted (licensed) | $4.0M | 0.79% |
| 33 | New York Marine and General Insurance Company | 16608 | NY | Admitted (licensed) | $3.9M | 0.77% |
| 34 | StarStone National Insurance Company | 25496 | DE | Admitted (licensed) | $3.5M | 0.69% |
| 35 | Federal Insurance Company | 20281 | IN | Admitted (licensed) | $3.2M | 0.64% |
| 36 | StarNet Insurance Company | 40045 | IA | Admitted (licensed) | $3.1M | 0.61% |
| 37 | Imperium Insurance Company | 35408 | TX | Admitted (licensed) | $2.7M | 0.52% |
| 38 | HYUNDAI MARINE \u0026 FIRE INSURANCE CO., LTD. (U.S. BRANCH) | 10048 | CA | Admitted (licensed) | $2.6M | 0.52% |
| 39 | Mitsui Sumitomo Insurance Company of America | 20362 | NY | Admitted (licensed) | $2.6M | 0.51% |
| 40 | U.S. Specialty Insurance Company | 29599 | TX | Admitted (licensed) | $2.4M | 0.48% |
| 41 | Aspen American Insurance Company | 43460 | TX | Admitted (licensed) | $2.4M | 0.48% |
| 42 | Atain Insurance Company | 29033 | TX | Admitted (licensed) | $2.1M | 0.41% |
| 43 | State National Insurance Company, Inc. | 12831 | TX | Admitted (licensed) | $2.0M | 0.40% |
| 44 | Sutton National Insurance Company | 25798 | OK | Admitted (licensed) | $1.9M | 0.38% |
| 45 | UNITED FIRE \u0026 CASUALTY COMPANY | 13021 | IA | Admitted (licensed) | $1.8M | 0.36% |
| 46 | Argonaut Insurance Company | 19801 | NE | Admitted (licensed) | $1.8M | 0.36% |
| 47 | Indemnity Insurance Company of North America | 43575 | PA | Admitted (licensed) | $1.7M | 0.33% |
| 48 | Affiliated F M Insurance Company | 10014 | RI | Admitted (licensed) | $1.4M | 0.27% |
| 49 | Berkshire Hathaway Specialty Insurance Company | 22276 | NE | Admitted (licensed) | $1.2M | 0.24% |
| 50 | American Modern Property and Casualty Insurance Company | 42722 | OH | Admitted (licensed) | $1.1M | 0.22% |
| 51 | Point Specialty Insurance Company | 25747 | WI | Admitted (licensed) | $826,277 | 0.16% |
| 52 | National Specialty Insurance Company | 22608 | TX | Admitted (licensed) | $683,285 | 0.13% |
| 53 | Red Shield Insurance Company | 41580 | WA | Admitted (licensed) | $636,322 | 0.13% |
| 54 | Accredited Surety and Casualty Company, Inc. | 26379 | FL | Admitted (licensed) | $579,026 | 0.11% |
| 55 | Allied World Assurance Company (U.S.), Inc. | 19489 | DE | Admitted (licensed) | $425,233 | 0.08% |
| 56 | Privilege Underwriters Reciprocal Exchange, PURE Risk Mgt, Atty-in-Fact | 12873 | FL | Admitted (licensed) | $326,078 | 0.06% |
| 57 | New Hampshire Insurance Company | 23841 | IL | Admitted (licensed) | $283,637 | 0.06% |
| 58 | Insurance Company of North America | 22713 | PA | Admitted (licensed) | $263,295 | 0.05% |
| 59 | Markel Insurance Company | 38970 | IL | Admitted (licensed) | $218,073 | 0.04% |
| 60 | United Services Automobile Association, USAA Reciprocal, Attorney-in-fact | 25941 | TX | Admitted (licensed) | $152,827 | 0.03% |
| 61 | Amica Mutual Insurance Company, The | 19976 | RI | Admitted (licensed) | $121,088 | 0.02% |
| 62 | USAA Casualty Insurance Company | 25968 | TX | Admitted (licensed) | $113,314 | 0.02% |
| 63 | Pinnacle National Insurance Company | 21296 | TX | Admitted (licensed) | $58,034 | 0.01% |
| 64 | Liberty Mutual Fire Insurance Company | 23035 | WI | Admitted (licensed) | $57,964 | 0.01% |
| 65 | Hudson Insurance Company | 25054 | DE | Admitted (licensed) | $35,898 | 0.01% |
| 66 | Continental Casualty Company | 20443 | IL | Admitted (licensed) | $33,400 | 0.01% |
| 67 | GEICO Marine Insurance Company | 37923 | NE | Admitted (licensed) | $15,849 | 0.00% |
| 68 | Chubb Indemnity Insurance Company | 12777 | NY | Admitted (licensed) | $9,202 | 0.00% |
| 69 | Star Insurance Company | 18023 | MI | Admitted (licensed) | $2,780 | 0.00% |
| 70 | Alaska National Insurance Company | 38733 | AK | Admitted (licensed) | $1,810 | 0.00% |
| 71 | Westchester Fire Insurance Company | 10030 | PA | Admitted (licensed) | $1,629 | 0.00% |
| 72 | Chubb National Insurance Company | 10052 | IN | Admitted (licensed) | $1,343 | 0.00% |
| 73 | Pacific Employers Insurance Company | 22748 | PA | Admitted (licensed) | $824 | 0.00% |
| 74 | American Alternative Insurance Corporation | 19720 | DE | Admitted (licensed) | $531 | 0.00% |
| 75 | Vigilant Insurance Company | 20397 | NY | Admitted (licensed) | $13 | 0.00% |
Method and source
Source: the California Department of Insurance company list, read 2026-10-17 and the surplus lines list. California's company search lists every company on file (all lines, including some no longer active); P&C status comes from the merge. "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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