Who writes ocean marine in South Dakota
Ranked by direct premium written in 2025 from the South Dakota market share report (every company, not a top-N list).
35 companies wrote ocean marine in South Dakota in 2025, $2.5M in direct premium. National Union Fire Insurance Company of Pittsburgh, Pennsylvania led with 22.9%; the top five hold 69%.
By Sam Alishahi, independent insurance broker · All lines in South Dakota
The companies
| # | Company | NAIC | Home state | Status here | Premium | Share |
|---|---|---|---|---|---|---|
| 1 | National Union Fire Insurance Company of Pittsburgh, Pennsylvania | 19445 | PA | Admitted (licensed) | $561,589 | 22.87% |
| 2 | Foremost Insurance Company Grand Rapids, Michigan | 11185 | MI | Admitted (licensed) | $359,642 | 14.65% |
| 3 | Great American Insurance Company | 16691 | OH | Admitted (licensed) | $317,720 | 12.94% |
| 4 | HDI Global Insurance Company | 41343 | IL | Admitted (licensed) | $259,132 | 10.55% |
| 5 | National Casualty Company | 11991 | OH | Admitted (licensed) | $189,230 | 7.71% |
| 6 | Markel American Insurance Company | 28932 | VA | Admitted (licensed) | $99,129 | 4.04% |
| 7 | Navigators Insurance Company | 42307 | NY | Admitted (licensed) | $97,058 | 3.95% |
| 8 | Continental Insurance Company, (The) | 35289 | PA | Admitted (licensed) | $76,098 | 3.10% |
| 9 | Mitsui Sumitomo Insurance USA Inc. | 22551 | NY | Admitted (licensed) | $74,329 | 3.03% |
| 10 | Ascot Insurance Company | 23752 | CO | Admitted (licensed) | $58,800 | 2.39% |
| 11 | Travelers Property Casualty Company of America | 25674 | CT | Admitted (licensed) | $55,909 | 2.28% |
| 12 | Accelerant National Insurance Company | 10220 | AR | Admitted (licensed) | $44,735 | 1.82% |
| 13 | AIG Property Casualty Company | 19402 | IL | Admitted (licensed) | $35,174 | 1.43% |
| 14 | StarNet Insurance Company | 40045 | IA | Admitted (licensed) | $32,750 | 1.33% |
| 15 | New York Marine and General Insurance Company | 16608 | NY | Admitted (licensed) | $29,587 | 1.20% |
| 16 | Travelers Property Casualty Insurance Company | 36161 | CT | Admitted (licensed) | $28,705 | 1.17% |
| 17 | StarStone National Insurance Company | 25496 | DE | Admitted (licensed) | $18,881 | 0.77% |
| 18 | AXIS Insurance Company | 37273 | IL | Admitted (licensed) | $17,659 | 0.72% |
| 19 | Federal Insurance Company | 20281 | IN | Admitted (licensed) | $16,834 | 0.69% |
| 20 | Privilege Underwriters Reciprocal Exchange, PURE Risk Mgt, Atty-in-Fact | 12873 | FL | Admitted (licensed) | $14,754 | 0.60% |
| 21 | Ace American Insurance Company | 22667 | PA | Admitted (licensed) | $13,890 | 0.57% |
| 22 | AGCS Marine Insurance Company | 22837 | IL | Admitted (licensed) | $13,298 | 0.54% |
| 23 | Indemnity Insurance Company of North America | 43575 | PA | Admitted (licensed) | $10,250 | 0.42% |
| 24 | RLI Insurance Company | 13056 | IL | Admitted (licensed) | $8,179 | 0.33% |
| 25 | Hanover Insurance Company (The) | 22292 | NH | Admitted (licensed) | $5,700 | 0.23% |
| 26 | Atlantic Specialty Insurance Company | 27154 | NY | Admitted (licensed) | $4,445 | 0.18% |
| 27 | United Services Automobile Association, USAA Reciprocal, Attorney-in-fact | 25941 | TX | Admitted (licensed) | $2,840 | 0.12% |
| 28 | Standard Fire Insurance Company (The) | 19070 | CT | Admitted (licensed) | $2,784 | 0.11% |
| 29 | Swiss Re Corporate Solutions America Insurance Corporation | 29874 | MO | Admitted (licensed) | $2,738 | 0.11% |
| 30 | USAA Casualty Insurance Company | 25968 | TX | Admitted (licensed) | $995 | 0.04% |
| 31 | Amica Mutual Insurance Company, The | 19976 | RI | Admitted (licensed) | $888 | 0.04% |
| 32 | OBI National Insurance Company | 14190 | PA | Admitted (licensed) | $686 | 0.03% |
| 33 | Ace Fire Underwriters Insurance Company | 20702 | PA | Admitted (licensed) | $581 | 0.02% |
| 34 | Automobile Insurance Company of Hartford, Connecticut (The) | 19062 | CT | Admitted (licensed) | $338 | 0.01% |
| 35 | Chubb Indemnity Insurance Company | 12777 | NY | Admitted (licensed) | $296 | 0.01% |
Method and source
Source: the South Dakota insurance regulator company list, read 2026-10-18. SD publishes no licensing roster. This is the SD Division of Insurance market share report set for 2025 (NAIC i-site, CodeList Basis: Licensed): every licensed company that reported SD direct premium on its 2025 annual statement, so licensed companies with no SD premium are absent. type = statement type of the total report(s) the company appears in (Property & Casualty / Life / Health / Title; Life covers both the Life & Annuity and the Life A&H totals). lines = SD per-line reports in which the company wrote direct premium > 0, named as the report headers name them (P&C lines plus the A&H lines filed on P&C/Life statements). Farm mutuals sheet (no NAIC codes) and the 'all statement types' aggregates skipped. No surplus lines eligibility list is published by SD (surplus lines filings go through the SLIP+ clearinghouse). 1 company(ies) found only in a per-line report, not in any total, left out: 38920 Kinsale Ins Co (Aircraft - All Perils). "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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