Who writes ocean marine in Illinois
Ranked by direct premium written in 2025 from the Illinois market share report (every company, not a top-N list).
93 companies wrote ocean marine in Illinois in 2025, $204.3M in direct premium. National Union Fire Insurance Company of Pittsburgh, Pennsylvania led with 43.9%; the top five hold 62%. 127 companies are licensed for the line.
By Sam Alishahi, independent insurance broker · All lines in Illinois
The companies
| # | Company | NAIC | Home state | Status here | Premium | Share |
|---|---|---|---|---|---|---|
| 1 | National Union Fire Insurance Company of Pittsburgh, Pennsylvania | 19445 | PA | Admitted (licensed) | $89.8M | 43.93% |
| 2 | STARR INDEMNITY \u0026 LIABILITY COMPANY | 38318 | TX | Admitted (licensed) | $12.7M | 6.20% |
| 3 | AGCS Marine Insurance Company | 22837 | IL | Admitted (licensed) | $8.3M | 4.07% |
| 4 | Travelers Property Casualty Company of America | 25674 | CT | Admitted (licensed) | $7.7M | 3.77% |
| 5 | New York Marine and General Insurance Company | 16608 | NY | Admitted (licensed) | $7.7M | 3.76% |
| 6 | Continental Insurance Company, (The) | 35289 | PA | Admitted (licensed) | $6.9M | 3.39% |
| 7 | HDI Global Insurance Company | 41343 | IL | Admitted (licensed) | $6.8M | 3.35% |
| 8 | Navigators Insurance Company | 42307 | NY | Admitted (licensed) | $6.4M | 3.15% |
| 9 | XL Specialty Insurance Company | 37885 | DE | Admitted (licensed) | $4.1M | 2.00% |
| 10 | Zurich American Insurance Company | 16535 | NY | Admitted (licensed) | $3.8M | 1.85% |
| 11 | Ascot Insurance Company | 23752 | CO | Admitted (licensed) | $3.8M | 1.85% |
| 12 | Great American Insurance Company | 16691 | OH | Admitted (licensed) | $3.7M | 1.82% |
| 13 | Endurance American Insurance Company | 10641 | DE | Admitted (licensed) | $3.3M | 1.61% |
| 14 | Ace American Insurance Company | 22667 | PA | Admitted (licensed) | $2.6M | 1.27% |
| 15 | Atlantic Specialty Insurance Company | 27154 | NY | Admitted (licensed) | $2.4M | 1.18% |
| 16 | AXIS Insurance Company | 37273 | IL | Admitted (licensed) | $2.2M | 1.09% |
| 17 | Tokio Marine America Insurance Company | 10945 | NY | Admitted (licensed) | $2.2M | 1.06% |
| 18 | Mitsui Sumitomo Insurance Company of America | 20362 | NY | Admitted (licensed) | $1.8M | 0.88% |
| 19 | Hanover Insurance Company (The) | 22292 | NH | Admitted (licensed) | $1.8M | 0.86% |
| 20 | RLI Insurance Company | 13056 | IL | Admitted (licensed) | $1.7M | 0.83% |
| 21 | Granada Indemnity Company | 38148 | NY | Admitted (licensed) | $1.4M | 0.70% |
| 22 | U.S. Specialty Insurance Company | 29599 | TX | Admitted (licensed) | $1.4M | 0.68% |
| 23 | |Houston Casualty Company | 42374 | TX | Admitted (licensed) | $1.3M | 0.66% |
| 24 | Liberty Mutual Insurance Company | 23043 | MA | Admitted (licensed) | $1.3M | 0.66% |
| 25 | SAMSUNG FIRE \u0026 MARINE INSURANCE CO., LTD. (U.S. BRANCH) | 38300 | NY | Admitted (licensed) | $1.3M | 0.65% |
| 26 | Beazley Insurance Company, Inc. | 37540 | CT | Admitted (licensed) | $1.2M | 0.60% |
| 27 | Imperium Insurance Company | 35408 | TX | Admitted (licensed) | $1.2M | 0.59% |
| 28 | Markel American Insurance Company | 28932 | VA | Admitted (licensed) | $1.1M | 0.54% |
| 29 | National Casualty Company | 11991 | OH | Admitted (licensed) | $1.1M | 0.52% |
| 30 | Affiliated F M Insurance Company | 10014 | RI | Admitted (licensed) | $1.0M | 0.51% |
| 31 | Foremost Insurance Company Grand Rapids, Michigan | 11185 | MI | Admitted (licensed) | $1.0M | 0.49% |
| 32 | Federal Insurance Company | 20281 | IN | Admitted (licensed) | $840,547 | 0.41% |
| 33 | Berkshire Hathaway Specialty Insurance Company | 22276 | NE | Admitted (licensed) | $828,519 | 0.41% |
| 34 | Indemnity Insurance Company of North America | 43575 | PA | Admitted (licensed) | $820,913 | 0.40% |
| 35 | QBE Insurance (Europe) Limited | 39217 | PA | Admitted (licensed) | $761,236 | 0.37% |
| 36 | StarNet Insurance Company | 40045 | IA | Admitted (licensed) | $733,391 | 0.36% |
| 37 | |Texas Insurance Company | 16543 | TX | Admitted (licensed) | $715,436 | 0.35% |
| 38 | AIG Property Casualty Company | 19402 | IL | Admitted (licensed) | $670,415 | 0.33% |
| 39 | Privilege Underwriters Reciprocal Exchange, PURE Risk Mgt, Atty-in-Fact | 12873 | FL | Admitted (licensed) | $655,202 | 0.32% |
| 40 | State National Insurance Company, Inc. | 12831 | TX | Admitted (licensed) | $626,617 | 0.31% |
| 41 | Mitsui Sumitomo Insurance USA Inc. | 22551 | NY | Admitted (licensed) | $572,814 | 0.28% |
| 42 | Travelers Home and Marine Insurance Company (The) | 27998 | CT | Admitted (licensed) | $390,061 | 0.19% |
| 43 | Stratford Insurance Company | 40436 | NH | Admitted (licensed) | $364,216 | 0.18% |
| 44 | Standard Fire Insurance Company (The) | 19070 | CT | Admitted (licensed) | $314,748 | 0.15% |
| 45 | Swiss Re Corporate Solutions America Insurance Corporation | 29874 | MO | Admitted (licensed) | $251,692 | 0.12% |
| 46 | Accelerant National Insurance Company | 10220 | AR | Admitted (licensed) | $248,293 | 0.12% |
| 47 | StarStone National Insurance Company | 25496 | DE | Admitted (licensed) | $239,692 | 0.12% |
| 48 | Point Excess and Surplus Insurance Company | 17445 | WI | Admitted (licensed) | $215,124 | 0.11% |
| 49 | Accredited Specialty Insurance Company (C) | 16835 | AZ | Admitted (licensed) | $188,843 | 0.09% |
| 50 | |Hadron Specialty Insurance Company | 17534 | AR | Admitted (licensed) | $157,939 | 0.08% |
| 51 | Accelerant Specialty Insurance Company | 16890 | AR | Admitted (licensed) | $155,219 | 0.08% |
| 52 | Aspen American Insurance Company | 43460 | TX | Admitted (licensed) | $136,238 | 0.07% |
| 53 | Palomar Excess and Surplus Insurance Company | 16754 | AZ | Admitted (licensed) | $115,232 | 0.06% |
| 54 | Spinnaker Specialty Insurance Company | 17045 | TX | Admitted (licensed) | $113,733 | 0.06% |
| 55 | Markel Insurance Company | 38970 | IL | Admitted (licensed) | $113,001 | 0.06% |
| 56 | Argonaut Insurance Company | 19801 | NE | Admitted (licensed) | $108,142 | 0.05% |
| 57 | StarStone Specialty Insurance Company | 44776 | DE | Admitted (licensed) | $83,500 | 0.04% |
| 58 | Atain Insurance Company | 29033 | TX | Admitted (licensed) | $83,242 | 0.04% |
| 59 | Evanston Insurance Company | 35378 | IL | Admitted (licensed) | $64,008 | 0.03% |
| 60 | Point Specialty Insurance Company | 25747 | WI | Admitted (licensed) | $57,953 | 0.03% |
| 61 | UNITED FIRE \u0026 CASUALTY COMPANY | 13021 | IA | Admitted (licensed) | $52,747 | 0.03% |
| 62 | Accredited Surety and Casualty Company, Inc. | 26379 | FL | Admitted (licensed) | $50,912 | 0.02% |
| 63 | Century Surety Company | 36951 | OH | Admitted (licensed) | $42,967 | 0.02% |
| 64 | Sutton National Insurance Company | 25798 | OK | Admitted (licensed) | $40,683 | 0.02% |
| 65 | Kinsale Insurance Company | 38920 | AR | Admitted (licensed) | $39,673 | 0.02% |
| 66 | New Hampshire Insurance Company | 23841 | IL | Admitted (licensed) | $39,371 | 0.02% |
| 67 | OBI National Insurance Company | 14190 | PA | Admitted (licensed) | $35,306 | 0.02% |
| 68 | Hudson Insurance Company | 25054 | DE | Admitted (licensed) | $29,987 | 0.01% |
| 69 | TravCo Insurance Company | 28188 | CT | Admitted (licensed) | $28,496 | 0.01% |
| 70 | Insurance Company of North America | 22713 | PA | Admitted (licensed) | $25,783 | 0.01% |
| 71 | Riverport Insurance Company | 36684 | IA | Admitted (licensed) | $24,025 | 0.01% |
| 72 | Gotham Insurance Company | 25569 | NY | Admitted (licensed) | $23,795 | 0.01% |
| 73 | Liberty Mutual Fire Insurance Company | 23035 | WI | Admitted (licensed) | $23,276 | 0.01% |
| 74 | Amica Mutual Insurance Company, The | 19976 | RI | Admitted (licensed) | $23,232 | 0.01% |
| 75 | United Services Automobile Association, USAA Reciprocal, Attorney-in-fact | 25941 | TX | Admitted (licensed) | $22,341 | 0.01% |
| 76 | National Specialty Insurance Company | 22608 | TX | Admitted (licensed) | $20,663 | 0.01% |
| 77 | American Alternative Insurance Corporation | 19720 | DE | Admitted (licensed) | $19,335 | 0.01% |
| 78 | Travelers Indemnity Company of America (The) | 25666 | CT | Admitted (licensed) | $11,485 | 0.01% |
| 79 | Vigilant Insurance Company | 20397 | NY | Admitted (licensed) | $10,940 | 0.01% |
| 80 | Atain Specialty Insurance Company | 17159 | MI | Admitted (licensed) | $10,622 | 0.01% |
| 81 | Chubb Indemnity Insurance Company | 12777 | NY | Admitted (licensed) | $8,806 | 0.00% |
| 82 | Pinnacle National Insurance Company | 21296 | TX | Admitted (licensed) | $7,681 | 0.00% |
| 83 | USAA Casualty Insurance Company | 25968 | TX | Admitted (licensed) | $6,861 | 0.00% |
| 84 | Great American Fidelity Insurance Company | 41858 | OH | Admitted (licensed) | $5,000 | 0.00% |
| 85 | Atlantic Casualty Insurance Company | 42846 | NC | Admitted (licensed) | $4,850 | 0.00% |
| 86 | Berkley Assurance Company | 32603 | DE | Admitted (licensed) | $3,083 | 0.00% |
| 87 | Automobile Insurance Company of Hartford, Connecticut (The) | 19062 | CT | Admitted (licensed) | $1,166 | 0.00% |
| 88 | GEICO Marine Insurance Company | 37923 | NE | Admitted (licensed) | $1,140 | 0.00% |
| 89 | Garrison Property and Casualty Insurance Company | 21253 | TX | Admitted (licensed) | $286 | 0.00% |
| 90 | Travelers Property Casualty Insurance Company | 36161 | CT | Admitted (licensed) | $250 | 0.00% |
| 91 | Mt. Hawley Insurance Company | 37974 | IL | Admitted (licensed) | $248 | 0.00% |
| 92 | Chubb National Insurance Company | 10052 | IN | Admitted (licensed) | $232 | 0.00% |
| 93 | Travelers Commercial Insurance Company | 36137 | CT | Admitted (licensed) | $100 | 0.00% |
Method and source
Source: the Illinois insurance regulator company list, read 2026-10-18. IDOI 2025 Market Share Report: Property and Casualty (published March 2026, 2025 annual-statement data). Lists every company with Illinois business written on the P&C statement: licensed companies, surplus lines insurers and risk retention groups together, with no status/type flag, so type is '' for all rows and the list is NOT a certificate-of-authority roster (a licensed company with zero IL premium and zero losses is omitted; non-admitted writers are included). 'lines' = P&C statement lines of business the company reported IL premium or losses under (48 of 54 lines have entries), a proxy for lines of authority. No 'since' date in the source. No Illinois surplus lines eligibility list exists (IL has no white list). 26 companies had a name or domicile cell missing in at least one PDF row; filled from the same NAIC code's other rows. "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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