
Who writes ocean marine in Colorado
From the Colorado company list; alphabetical, since Colorado doesn't publish every company's premium by line.
86 insurers are licensed for ocean marine in Colorado on the regulator's list. American International Group wrote the most in 2025 (16.6% of the state's premium).
By Sam Alishahi, independent insurance broker · All lines in Colorado
The companies
| Company | NAIC | Home state | Status here | Lines |
|---|---|---|---|---|
| Accelerant National Insurance Company | 10220 | AR | Admitted (licensed) | Aircraft and aviation, Personal auto, Equipment breakdown +10 more |
| Accredited Surety and Casualty Company, Inc. | 26379 | FL | Admitted (licensed) | Personal auto, Equipment breakdown, Commercial auto +7 more |
| Ace American Insurance Company | 22667 | PA | Admitted (licensed) | Aircraft and aviation, Personal auto, Equipment breakdown +15 more |
| Ace Fire Underwriters Insurance Company | 20702 | PA | Admitted (licensed) | Personal auto, Equipment breakdown, Commercial auto +7 more |
| Ace Property and Casualty Insurance Company | 20699 | PA | Admitted (licensed) | Aircraft and aviation, Personal auto, Equipment breakdown +11 more |
| Affiliated F M Insurance Company | 10014 | RI | Admitted (licensed) | Equipment breakdown, Earthquake, Homeowners +4 more |
| AGCS Marine Insurance Company | 22837 | IL | Admitted (licensed) | Commercial package (BOP, CMP), Inland marine, General liability +1 more |
| AIG Property Casualty Company | 19402 | IL | Admitted (licensed) | Personal auto, Commercial auto, Earthquake +7 more |
| Alaska National Insurance Company | 38733 | AK | Admitted (licensed) | Personal auto, Equipment breakdown, Commercial auto +7 more |
| American Alternative Insurance Corporation | 19720 | DE | Admitted (licensed) | Aircraft and aviation, Personal auto, Commercial auto +12 more |
| American Reliable Insurance Company | 19615 | AZ | Admitted (licensed) | Personal auto, Commercial auto, Commercial package (BOP, CMP) +5 more |
| Amica Mutual Insurance Company, The | 19976 | RI | Admitted (licensed) | Personal auto, Earthquake, Homeowners +4 more |
| Argonaut Insurance Company | 19801 | NE | Admitted (licensed) | Personal auto, Commercial auto, Commercial package (BOP, CMP) +8 more |
| Ascot Insurance Company | 23752 | CO | Admitted (licensed) | Personal auto, Commercial auto, Commercial package (BOP, CMP) +6 more |
| Aspen American Insurance Company | 43460 | TX | Admitted (licensed) | Equipment breakdown, Commercial package (BOP, CMP), Earthquake +9 more |
| Atain Insurance Company | 29033 | TX | Admitted (licensed) | Ocean marine |
| Atlantic Specialty Insurance Company | 27154 | NY | Admitted (licensed) | Personal auto, Equipment breakdown, Commercial auto +13 more |
| Automobile Insurance Company of Hartford, Connecticut (The) | 19062 | CT | Admitted (licensed) | Commercial package (BOP, CMP), Crime (burglary and theft), Earthquake +6 more |
| AXIS Insurance Company | 37273 | IL | Admitted (licensed) | Personal auto, Equipment breakdown, Commercial auto +9 more |
| Beazley Insurance Company, Inc. | 37540 | CT | Admitted (licensed) | Fidelity bonds, Inland marine, General liability +3 more |
| Berkshire Hathaway Specialty Insurance Company | 22276 | NE | Admitted (licensed) | Personal auto, Equipment breakdown, Commercial auto +11 more |
| Chubb Indemnity Insurance Company | 12777 | NY | Admitted (licensed) | Equipment breakdown, Commercial package (BOP, CMP), Crime (burglary and theft) +5 more |
| Chubb National Insurance Company | 10052 | IN | Admitted (licensed) | Aircraft and aviation, Personal auto, Equipment breakdown +10 more |
| Coliseum Reinsurance Company | 36552 | DE | Admitted (licensed) | Aircraft and aviation, Personal auto, General liability +1 more |
| Continental Casualty Company | 20443 | IL | Admitted (licensed) | Personal auto, Equipment breakdown, Commercial auto +14 more |
| Continental Insurance Company, (The) | 35289 | PA | Admitted (licensed) | Personal auto, Equipment breakdown, Commercial auto +12 more |
| Endurance American Insurance Company | 10641 | DE | Admitted (licensed) | Aircraft and aviation, Equipment breakdown, Commercial package (BOP, CMP) +6 more |
| Everest National Insurance Company | 10120 | DE | Admitted (licensed) | Personal auto, Commercial auto, Commercial package (BOP, CMP) +9 more |
| Federal Insurance Company | 20281 | IN | Admitted (licensed) | Aircraft and aviation, Personal auto, Equipment breakdown +14 more |
| Fireman's Fund Insurance Company | 21873 | IL | Admitted (licensed) | Aircraft and aviation, Personal auto, Equipment breakdown +13 more |
| Foremost Insurance Company Grand Rapids, Michigan | 11185 | MI | Admitted (licensed) | Personal auto, Commercial package (BOP, CMP), Fidelity bonds +7 more |
| Garrison Property and Casualty Insurance Company | 21253 | TX | Admitted (licensed) | Personal auto, Commercial package (BOP, CMP), Earthquake +5 more |
| GEICO Marine Insurance Company | 37923 | NE | Admitted (licensed) | Personal auto, Commercial auto, Inland marine +2 more |
| Great American Insurance Company | 16691 | OH | Admitted (licensed) | Aircraft and aviation, Personal auto, Equipment breakdown +14 more |
| Hanover Insurance Company (The) | 22292 | NH | Admitted (licensed) | Personal auto, Equipment breakdown, Commercial auto +11 more |
| Harco National Insurance Company | 26433 | IL | Admitted (licensed) | Aircraft and aviation, Personal auto, Commercial auto +6 more |
| HDI Global Insurance Company | 41343 | IL | Admitted (licensed) | Personal auto, Equipment breakdown, Commercial auto +6 more |
| Hudson Insurance Company | 25054 | DE | Admitted (licensed) | Personal auto, Equipment breakdown, Commercial auto +10 more |
| Imperium Insurance Company | 35408 | TX | Admitted (licensed) | Aircraft and aviation, Personal auto, Commercial auto +7 more |
| Indemnity Insurance Company of North America | 43575 | PA | Admitted (licensed) | Aircraft and aviation, Personal auto, Equipment breakdown +10 more |
| Insurance Company of North America | 22713 | PA | Admitted (licensed) | Aircraft and aviation, Personal auto, Commercial auto +5 more |
| Liberty Mutual Fire Insurance Company | 23035 | WI | Admitted (licensed) | Personal auto, Equipment breakdown, Commercial auto +11 more |
| Liberty Mutual Insurance Company | 23043 | MA | Admitted (licensed) | Personal auto, Commercial auto, Commercial package (BOP, CMP) +12 more |
| Markel American Insurance Company | 28932 | VA | Admitted (licensed) | Personal auto, Equipment breakdown, Commercial auto +8 more |
| Markel Insurance Company | 38970 | IL | Admitted (licensed) | Personal auto, Commercial auto, Commercial package (BOP, CMP) +11 more |
| Mitsui Sumitomo Insurance Company of America | 20362 | NY | Admitted (licensed) | Aircraft and aviation, Personal auto, Equipment breakdown +8 more |
| Mitsui Sumitomo Insurance USA Inc. | 22551 | NY | Admitted (licensed) | Aircraft and aviation, Personal auto, Commercial auto +6 more |
| National Casualty Company | 11991 | OH | Admitted (licensed) | Personal auto, Equipment breakdown, Commercial auto +13 more |
| NATIONAL LIABILITY \u0026 FIRE INSURANCE COMPANY | 20052 | CT | Admitted (licensed) | Aircraft and aviation, Personal auto, Commercial auto +5 more |
| National Specialty Insurance Company | 22608 | TX | Admitted (licensed) | Personal auto, Commercial auto, Commercial package (BOP, CMP) +5 more |
| National Union Fire Insurance Company of Pittsburgh, Pennsylvania | 19445 | PA | Admitted (licensed) | Aircraft and aviation, Personal auto, Equipment breakdown +16 more |
| Navigators Insurance Company | 42307 | NY | Admitted (licensed) | Personal auto, Commercial auto, Commercial package (BOP, CMP) +5 more |
| New Hampshire Insurance Company | 23841 | IL | Admitted (licensed) | Aircraft and aviation, Personal auto, Equipment breakdown +10 more |
| New York Marine and General Insurance Company | 16608 | NY | Admitted (licensed) | Aircraft and aviation, Personal auto, Equipment breakdown +10 more |
| Pinnacle National Insurance Company | 21296 | TX | Admitted (licensed) | Commercial package (BOP, CMP), Inland marine, General liability +1 more |
| Point Specialty Insurance Company | 25747 | WI | Admitted (licensed) | Inland marine, Ocean marine |
| Privilege Underwriters Reciprocal Exchange, PURE Risk Mgt, Atty-in-Fact | 12873 | FL | Admitted (licensed) | Personal auto, Flood, Homeowners +3 more |
| QBE Insurance (Europe) Limited | 39217 | PA | Admitted (licensed) | Aircraft and aviation, Personal auto, Equipment breakdown +18 more |
| RLI Insurance Company | 13056 | IL | Admitted (licensed) | Personal auto, Commercial auto, Commercial package (BOP, CMP) +7 more |
| SAMSUNG FIRE \u0026 MARINE INSURANCE CO., LTD. (U.S. BRANCH) | 38300 | NY | Admitted (licensed) | General liability, Ocean marine, Workers' compensation |
| St. Paul Fire and Marine Insurance Company | 24767 | CT | Admitted (licensed) | Aircraft and aviation, Personal auto, Commercial auto +12 more |
| Standard Fire Insurance Company (The) | 19070 | CT | Admitted (licensed) | Personal auto, Commercial auto, Commercial package (BOP, CMP) +10 more |
| Star Insurance Company | 18023 | MI | Admitted (licensed) | Aircraft and aviation, Personal auto, Commercial auto +7 more |
| StarNet Insurance Company | 40045 | IA | Admitted (licensed) | Personal auto, Equipment breakdown, Commercial auto +11 more |
| STARR INDEMNITY \u0026 LIABILITY COMPANY | 38318 | TX | Admitted (licensed) | Aircraft and aviation, Personal auto, Commercial auto +9 more |
| StarStone National Insurance Company | 25496 | DE | Admitted (licensed) | Aircraft and aviation, Personal auto, Commercial auto +6 more |
| State National Insurance Company, Inc. | 12831 | TX | Admitted (licensed) | Aircraft and aviation, Personal auto, Commercial auto +12 more |
| Stratford Insurance Company | 40436 | NH | Admitted (licensed) | Farm and crop, General liability, Ocean marine |
| Sutton National Insurance Company | 25798 | OK | Admitted (licensed) | Homeowners, Ocean marine |
| Swiss Re Corporate Solutions America Insurance Corporation | 29874 | MO | Admitted (licensed) | Personal auto, Equipment breakdown, Commercial auto +9 more |
| Tokio Marine America Insurance Company | 10945 | NY | Admitted (licensed) | Aircraft and aviation, Personal auto, Equipment breakdown +7 more |
| TravCo Insurance Company | 28188 | CT | Admitted (licensed) | Inland marine, Ocean marine |
| Travelers Home and Marine Insurance Company (The) | 27998 | CT | Admitted (licensed) | Personal auto, Earthquake, Homeowners +3 more |
| Travelers Indemnity Company of America (The) | 25666 | CT | Admitted (licensed) | Personal auto, Equipment breakdown, Commercial auto +11 more |
| Travelers Personal Insurance Company | 38130 | CT | Admitted (licensed) | Earthquake, Homeowners, Inland marine +2 more |
| Travelers Property Casualty Company of America | 25674 | CT | Admitted (licensed) | Aircraft and aviation, Personal auto, Equipment breakdown +13 more |
| U.S. Specialty Insurance Company | 29599 | TX | Admitted (licensed) | Aircraft and aviation, Personal auto, Equipment breakdown +9 more |
| UNITED FIRE \u0026 CASUALTY COMPANY | 13021 | IA | Admitted (licensed) | Personal auto, Equipment breakdown, Commercial auto +11 more |
| United Services Automobile Association, USAA Reciprocal, Attorney-in-fact | 25941 | TX | Admitted (licensed) | Personal auto, Earthquake, Homeowners +4 more |
| United States Fidelity and Guaranty Company | 25887 | CT | Admitted (licensed) | Aircraft and aviation, Personal auto, Commercial auto +8 more |
| United States Fire Insurance Company | 21113 | DE | Admitted (licensed) | Personal auto, Commercial auto, Commercial package (BOP, CMP) +10 more |
| USAA Casualty Insurance Company | 25968 | TX | Admitted (licensed) | Personal auto, Earthquake, Homeowners +4 more |
| Vigilant Insurance Company | 20397 | NY | Admitted (licensed) | Personal auto, Equipment breakdown, Commercial auto +11 more |
| Westport Insurance Corporation | 39845 | MO | Admitted (licensed) | Personal auto, Equipment breakdown, Commercial auto +8 more |
| XL Specialty Insurance Company | 37885 | DE | Admitted (licensed) | Aircraft and aviation, Personal auto, Equipment breakdown +12 more |
| Zurich American Insurance Company | 16535 | NY | Admitted (licensed) | Personal auto, Equipment breakdown, Commercial auto +14 more |
Method and source
Source: the Colorado insurance regulator company list, read 2026-10-18 and the surplus lines list. ADMITTED = Colorado 2025 Insurance Industry Statistical Report (CY2024 data), sheet 'NAIC Companies' (every NAIC-coded company filing with the CO Division of Insurance, 1839 companies) joined to 'NAIC Companies Data' (type) and the 63 line-of-business sheets (lines written in CO + Lic flag). Lic flag per line sheet, consistent per company across sheets (0 conflicts): Y = licensed/admitted, S = surplus lines, N = not licensed, N/A = not applicable. Cross-check: 125/127 Lic=S companies are on the DOI eligible-nonadmitted PDF and 0 Lic=Y companies are. 'admitted' holds Lic=Y (1169) plus 281 companies that file with the CO DOI but wrote no CO premium in CY2024 (no Lic flag; lic='') and are not on the surplus PDF. 'not_admitted' (extra key, 456 rows, same row shape) holds Lic=S/N/N/A companies and no-premium companies that are on the surplus PDF. Row extras: lic (flag as given), group (NAIC group number stripped from the name). 'type' as given: Company Filing Statement Type / Business Type / Business Sub Type Statement Type: P = Property L = Life X = Health Business Type: F = Fraternal G = Other L = Life P = Property R = Risk T = Title X = Health Business Sub Type: HI = Hospital,Medical,Dental or Indemnity HM = Health Maintainance Org LH = Limited Health Service Org N = None PD = Prepaid Dental. Life/health/title companies are included (filter on type: first letter P = property/casualty statement, L = life, X = health; 'P/R/N' = risk retention group, 'T/T/N' = title). 'lines' = CO line-of-business sheets the company reported premium on in CY2024 (not lines of authority; a licensed company with no CO premium has lines=[]). 'since' is not in the source (left ''). Names are NAIC-style abbreviations. 74 companies appear in line sheets but not in the master list (mostly N/N/A). SURPLUS_LINES = DOI 'Colorado Eligible Nonadmitted Insurers Writing Surplus Lines' PDF, effective July 1, 2026, updated 9/16/26; 261 rows (227 NAIC-coded + 34 alien with AA- codes; naic='' and aa_code set for aliens). Colorado has no stamping office. PDF has no domicile column: domicile filled from the statistical report master list where the NAIC code matches (213 of 227). eligible = list effective date, not the insurer's first-eligible date. Prior-year reports: https://doi.colorado.gov/colorado-insurance-industry-statistical-report. "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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