Directory · Companies M · Updated 2026-10-18
Insurance companies starting with M
Property and casualty insurers whose names start with M, with NAIC numbers, home state, how many states list each as admitted or as a surplus lines insurer, and the lines it is licensed for. Filter by line, type or state.
237 companies: 226 admitted somewhere, 33 eligible for surplus lines somewhere. Click a company for its state-by-state page.
By Sam Alishahi, independent insurance broker · A to Z
Companies M
The list
| Company | NAIC | Home state | Admitted in | Surplus lines in | Lines |
|---|---|---|---|---|---|
| Mada Insurance Exchange | — | MN | 1 | 0 | — |
| Madison Mutual Insurance Company | 14443 | IL | 3 | 0 | Personal auto, Commercial package (BOP, CMP), Farm and crop +3 more |
| Madison Mutual Insurance Company | 30449 | New York | 1 | 0 | — |
| MAG Mutual Insurance Company | 42617 | GA | 33 | 0 | Personal auto, Commercial package (BOP, CMP), Crime (burglary and theft) +8 more |
| Maidstone Insurance Company | 34460 | NY | 8 | 0 | Personal auto, General liability, Commercial property (fire and allied lines) +1 more |
| Main Street America Assurance Company | 29939 | FL | 12 | 0 | Personal auto, Commercial auto, Commercial package (BOP, CMP) +11 more |
| Main Street America Protection Insurance Company | 13026 | FL | 13 | 0 | Personal auto, Commercial package (BOP, CMP), Earthquake +9 more |
| Main Street Mutual Insurance Inc | 13864 | MO | 1 | 0 | — |
| Maine Employers' Mutual Insurance Company | 11149 | ME | 18 | 0 | General liability, Workers' compensation |
| Mainsail Insurance Company | 17203 | TX | 22 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +16 more |
| Mamic Mutual Insurance Company | 13891 | MO | 1 | 0 | — |
| Mangrove Property Insurance Company | 17735 | FL | 1 | 0 | Homeowners, Inland marine, General liability +1 more |
| Manufacturers Alliance Insurance Company | 36897 | PA | 33 | 0 | Personal auto, Equipment breakdown, Commercial auto +10 more |
| Mapfre Espana, Compania de Seguros y | — | — | 0 | 1 | — |
| Mapfre Espana, Compania De Seguros Y Reaseguros | — | — | 0 | 1 | — |
| Mapfre Espana, Compania de Seguros y Reaseguros, S.A. | — | SP | 1 | 7 | — |
| Mapfre España, Compañia de Seguros y Reaseguros, S.A. | — | — | 0 | 2 | — |
| MAPFRE Global Risks, Comp Internacional | — | SP | 0 | 1 | — |
| MAPFRE Insurance Company | 23876 | NJ | 24 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +11 more |
| MAPFRE Insurance Company of Florida | 34932 | FL | 1 | 0 | Aircraft and aviation, Personal auto, Commercial auto +7 more |
| Mapfre Mexico, S.A. | — | — | 1 | 0 | Personal auto, General liability |
| Maple Valley Mutual Insurance Company | 31780 | WI | 1 | 0 | Commercial package (BOP, CMP), Farm and crop, Homeowners +2 more |
| Marbleshore Specialty Insurance Company | 13551 | DE | 5 | 21 | Personal auto, Commercial auto, General liability +1 more |
| Marine Insurance Company Limited (The) | AA1121276 | UK | 2 | 17 | — |
| Markel American Insurance Company | 28932 | VA | 35 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +17 more |
| Markel Bermuda Limited - RJ-3190829 | — | NY | 1 | 0 | — |
| Markel Global Reinsurance Company | 10829 | DE | 27 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +14 more |
| Markel Insurance Company | 38970 | IL | 35 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +15 more |
| Markel Insurance S.E. | — | GE | 0 | 7 | — |
| Markel International IC Ltd. | — | UK | 0 | 1 | — |
| Markel International Insurance Company Limited | 10744 | UK | 7 | 12 | — |
| Markel International Insurance Company Limited | AA1121425 | — | 0 | 1 | — |
| Martinsburg Mutual Insurance Company | 13892 | MO | 1 | 0 | — |
| Maryland Automobile Insurance Fund (MAIF) | 34800 | MD | 1 | 0 | — |
| Maryland Casualty Company | 19356 | MD | 2 | 0 | — |
| Massachusetts Bay Insurance Company | 22306 | NH | 35 | 0 | Personal auto, Equipment breakdown, Commercial auto +14 more |
| Massachusetts Employers Insurance Company | 12886 | MA | 1 | 0 | Workers' compensation |
| Maxum Casualty Insurance Company | 10784 | CT | 32 | 0 | Personal auto, Fidelity bonds, Inland marine +5 more |
| Maxum Indemnity Company | 26743 | CT | 4 | 23 | Commercial package (BOP, CMP), Earthquake, Inland marine +2 more |
| Maya Assurance Company | 36030 | New York | 1 | 0 | — |
| MBIA Insurance Corporation | 12041 | NY | 31 | 0 | Fidelity bonds, Financial guaranty, General liability +2 more |
| Mca Insurance Company | 23639 | OK | 1 | 0 | — |
| MCIC Vermont, Inc. (A Risk Retention Group) | 10697 | VT | 1 | 0 | — |
| Mclean Mchenry Mutual Ins Co | — | ND | 1 | 0 | — |
| McMillan-Warner Mutual Insurance Company | 11036 | WI | 1 | 0 | Personal auto, Commercial package (BOP, CMP), Farm and crop +2 more |
| MD Advantage Insurance Company of New Jersey | 11498 | NJ | 1 | 1 | — |
| MDOW Insurance Company | 12810 | TX | 2 | 0 | Personal auto, Farm and crop, Homeowners +2 more |
| Med Mal Risk Retention Group, Inc. | 14446 | TN | 1 | 0 | — |
| Medical Alliance Ins Co | 11861 | IL | 1 | 0 | General liability, Medical malpractice, Professional liability (E&O) |
| Medical Health Insuring Corporation of Ohio | 95828 | OH | 2 | 0 | General liability, Workers' compensation |
| Medical Insurance Exchange Of California | 32433 | CA | 6 | 0 | General liability, Medical malpractice, Workers' compensation |
| Medical Liab Alliance | 10686 | MO | 2 | 0 | General liability, Medical malpractice, Professional liability (E&O) |
| Medical Mutual Insurance Company of Maine | 36277 | ME | 1 | 0 | — |
| Medical Mutual Insurance Company of North Carolina | 32522 | NC | 25 | 0 | Personal auto, General liability, Medical malpractice +2 more |
| Medical Mutual Liability Insurance Society of Maryland | 32328 | MD | 1 | 0 | — |
| Medical Mutual of Ohio | 29076 | OH | 4 | 0 | — |
| Medical Professional Mutual Insurance Company | 10206 | MA | 2 | 0 | Fidelity bonds, Surety bonds |
| Medical Protective Company (The) | 11843 | IN | 35 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +14 more |
| Medical Security Insurance Company | 33090 | NC | 6 | 20 | General liability, Medical malpractice, Professional liability (E&O) |
| Medicus Insurance Company | 12754 | TX | 23 | 0 | Personal auto, Crime (burglary and theft), Glass +6 more |
| Medmarc Casualty Insurance Company | 22241 | VT | 35 | 0 | Personal auto, Commercial auto, Commercial package (BOP, CMP) +10 more |
| MedPro RRG Risk Retention Group | 13589 | DC | 6 | 0 | General liability, Medical malpractice, Professional liability (E&O) |
| Meemic Insurance Company | 16101 | MI | 6 | 0 | Personal auto, Homeowners, General liability +2 more |
| MEM Mutual Insurance Company | 10191 | MO | 7 | 0 | Workers' compensation |
| MEM Preserve Insurance Company | 17719 | MO | 3 | 0 | — |
| MEM Protect Insurance Company | 17569 | MO | 4 | 0 | Workers' compensation |
| MEM Secure Insurance Company | 17568 | MO | 4 | 0 | Workers' compensation |
| MEM Shield Insurance Company | 17570 | MO | 4 | 0 | Workers' compensation |
| Members Mutual Insurance Association | 15387 | IA | 1 | 0 | — |
| MemberSelect Insurance Company | 21229 | MI | 10 | 0 | Personal auto, Homeowners, Inland marine +3 more |
| MEMIC Casualty Company | 14164 | NH | 25 | 0 | General liability, Workers' compensation |
| MEMIC Indemnity Company | 11030 | NH | 33 | 0 | General liability, Workers' compensation |
| Mendakota Casualty Company | 42862 | IL | 5 | 0 | Personal auto, General liability |
| Mendakota Insurance Company | 22454 | TN | 12 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +12 more |
| Mendota Insurance Company | 33650 | TN | 26 | 0 | Personal auto, Equipment breakdown, Crime (burglary and theft) +6 more |
| Mennonite Mutual Insurance Company | 17299 | OH | 1 | 0 | — |
| Mental Health Risk Retention Group, Inc. | 44237 | VT | 7 | 0 | General liability |
| Merastar Insurance Company | 31968 | IL | 31 | 0 | Personal auto, Commercial auto, Commercial package (BOP, CMP) +10 more |
| Merced County Mutual Fire Insurance Company | 15768 | CA | 1 | 0 | — |
| Mercer Insurance Company | 14478 | PA | 6 | 20 | Commercial package (BOP, CMP), Inland marine, General liability +1 more |
| Mercer Insurance Company of New Jersey, Inc. | 43540 | New Jersey | 2 | 0 | — |
| Merchants Bonding Company (Mutual) | 14494 | IA | 35 | 0 | Personal auto, Crime (burglary and theft), Fidelity bonds +4 more |
| Merchants Mutual Insurance Company | 23329 | NY | 7 | 0 | Personal auto, Fidelity bonds, General liability +2 more |
| Merchants National Bonding, Inc. | 11595 | IA | 35 | 0 | Personal auto, Crime (burglary and theft), Fidelity bonds +3 more |
| Merchants National Insurance Company | 12775 | NH | 4 | 18 | General liability |
| Merchants Preferred Insurance Company | 12901 | NY | 7 | 0 | Personal auto, Fidelity bonds, General liability +2 more |
| Mercury Casualty Company | 11908 | CA | 6 | 0 | Personal auto, Commercial auto, Commercial package (BOP, CMP) +3 more |
| Mercury County Mutual Insurance Company | 29394 | TX | 1 | 0 | Personal auto, Commercial auto, Crime (burglary and theft) +4 more |
| Mercury Indemnity Company of America | 11201 | FL | 2 | 0 | Personal auto, Commercial auto, Homeowners +1 more |
| Mercury Indemnity Company of Georgia | 10015 | GA | 1 | 0 | General liability, Commercial property (fire and allied lines), Surety bonds +1 more |
| Mercury Insurance Company | 27553 | CA | 1 | 0 | Personal auto |
| Mercury Insurance Company of Georgia | 34410 | GA | 1 | 0 | General liability, Commercial property (fire and allied lines), Surety bonds +1 more |
| Mercury Insurance Company of Illinois | 34444 | IL | 2 | 0 | Personal auto, Commercial auto, Homeowners +1 more |
| Mercury Insurance Company of Texas | 25470 | TX | 1 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +11 more |
| Meredith Insurance Company | 10381 | New York | 1 | 0 | — |
| Meridian Security Insurance Company | 23353 | IN | 28 | 0 | Personal auto, Equipment breakdown, Crime (burglary and theft) +10 more |
| Merrimack Insurance Company | 19798 | MA | 7 | 0 | Commercial package (BOP, CMP), Fidelity bonds, Homeowners +5 more |
| Mesa Underwriters Specialty Insurance Company | 36838 | NJ | 4 | 23 | Personal auto, Equipment breakdown, Commercial auto +4 more |
| Metromile Insurance Company | 16187 | NY | 32 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +11 more |
| Metropolitan General Insurance Company | 39950 | RI | 35 | 0 | Personal auto, Farm and crop, Homeowners +6 more |
| MFS Mutual Insurance Company | 27014 | IA | 1 | 0 | — |
| MGA Insurance Company, Inc. | 40150 | TX | 22 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +12 more |
| MGIC Assurance Corporation | 22594 | WI | 28 | 0 | Credit, Fidelity bonds, General liability +2 more |
| MGIC Credit Assurance Corporation | 10682 | WI | 13 | 0 | Mortgage guaranty |
| MGIC Indemnity Corporation | 18740 | WI | 29 | 0 | General liability, Mortgage guaranty, Workers' compensation |
| MGIC Indemnity Corporation | 12149 | NY | 3 | 0 | — |
| MGT Specialty Insurance Company | 17666 | AZ | 4 | 16 | Commercial package (BOP, CMP), General liability |
| Mha Insurance Company | 33111 | — | 1 | 0 | — |
| Miami Mutual Insurance Company | 16764 | OH | 4 | 0 | — |
| MIC General Insurance Corporation | 38660 | IL | 32 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +18 more |
| MIC Property and Casualty Insurance Corporation | 38601 | MI | 35 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +17 more |
| MICA Risk Retention Group Inc. | 15527 | DC | 5 | 0 | — |
| Michigan Millers Mutual Insurance Company | 14508 | MI | 17 | 0 | Commercial package (BOP, CMP), Fidelity bonds, General liability +4 more |
| Michigan Professional Insurance Exchange | 31429 | MI | 1 | 0 | — |
| MICO Insurance Company | 40932 | OH | 7 | 0 | Personal auto, Earthquake, Flood +4 more |
| Mid-American Fire and Casualty Company | 23507 | NH | 4 | 0 | — |
| Mid-Century Insurance Company | 21687 | CA | 34 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +15 more |
| Mid-Century Insurance Company of Texas | 28673 | TX | 2 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +13 more |
| Mid-Continent Assurance Company | 15380 | OH | 17 | 0 | Personal auto, Equipment breakdown, Commercial auto +10 more |
| Mid-Continent Casualty Company | 23418 | OH | 33 | 0 | Personal auto, Equipment breakdown, Commercial auto +12 more |
| Mid-Continent Excess and Surplus Insurance Company | 13794 | OH | 4 | 18 | General liability |
| Mid-Continent Excess and Surplus Lines Insurance Company | — | DE | 0 | 1 | — |
| Mid-Hudson Co-Operative Insurance Company | 35866 | NY | 2 | 0 | — |
| Middle States Insurance Company, Inc. | 31810 | OK | 2 | 0 | Personal auto, General liability, Commercial property (fire and allied lines) |
| Middlesex Insurance Company | 23434 | WI | 35 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +15 more |
| Midland Insurance Company | 23493 | NY | 1 | 0 | — |
| Midrox Insurance Company | 26835 | New York | 1 | 0 | — |
| MidSouth Insurance Company | 12839 | TN | 11 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +11 more |
| Midstate Mutual Insurance Company | 26818 | New York | 1 | 0 | — |
| MidStates ReInsurance Corporation | 20451 | IL | 11 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +11 more |
| Midvale Indemnity Company | 27138 | WI | 35 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +14 more |
| Midwest Employers Casualty Company | 23612 | IA | 35 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +16 more |
| Midwest Family Advantage Insurance Company | 16262 | IA | 16 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +9 more |
| Midwest Family Mutual Insurance Company | 23574 | IA | 20 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +14 more |
| Midwest Insurance Company | 10895 | IL | 14 | 0 | General liability, Workers' compensation |
| MIDWEST INSURANCE GROUP, INC., a RISK RETENTION GROUP | 11999 | VT | 9 | 0 | General liability, Medical malpractice, Professional liability (E&O) |
| Midwest Preferred Mutual Insurance Company | 13895 | MO | 1 | 0 | — |
| Midwest Public Risk of Missouri | 15240 | MO | 1 | 0 | — |
| Midwestern Equity Title Insurance Company | 10282 | IN | 1 | 0 | — |
| Midwestern Indemnity Company (The) | 23515 | OH | 16 | 0 | Personal auto, Commercial auto, Commercial package (BOP, CMP) +4 more |
| MIEC Mutual Risk Retention Group | 17794 | DC | 3 | 0 | — |
| Milbank Insurance Company | 41653 | IA | 15 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +12 more |
| Milbank Insurance Company | — | IA | 3 | 0 | — |
| Milford Casualty Insurance Company | 26662 | DE | 35 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +13 more |
| Millers Capital Insurance Company | 14575 | PA | 6 | 0 | Commercial package (BOP, CMP), General liability |
| Millers Classified Ins Co | 40185 | — | 1 | 0 | — |
| Millers Classified Insurance Company | — | IL | 1 | 0 | — |
| Millers First Insurance Company | 14583 | IL | 4 | 0 | Personal auto, Equipment breakdown, Crime (burglary and theft) +7 more |
| Millville Insurance Company of New York | 10811 | New York | 1 | 0 | — |
| Milwaukee Insurance Company | 14591 | — | 1 | 0 | — |
| Minnesota Lawyers Mutual Insurance Company | 42234 | MN | 31 | 0 | Personal auto, General liability, Ocean marine +3 more |
| Mississippi Farm Bureau Casualty Insurance Company | 27669 | MS | 2 | 1 | Personal auto, Equipment breakdown, Farm and crop +5 more |
| Missouri Alliance Mutual Insurance Company | 13906 | MO | 1 | 0 | — |
| Missouri Automobile Insurance Plan | 16931 | MO | 1 | 0 | — |
| Missouri Doctors Mutual Insurance Company | 11964 | MO | 1 | 0 | Medical malpractice |
| Missouri Educators Unified Health Plan Inc | 15242 | MO | 1 | 0 | — |
| Missouri Farm & Home Mutual Insurance Company | 13843 | MO | 1 | 0 | — |
| Missouri Heritage Mutual Insurance Company | 13896 | MO | 1 | 0 | — |
| Missouri Hometown Mutual Insurance Company | 13852 | MO | 1 | 0 | — |
| Missouri Hospital Plan | 27642 | MO | 1 | 0 | General liability, Medical malpractice |
| Missouri Housing Authorities Property and Casualty Inc | 32140 | MO | 1 | 0 | — |
| Missouri Intergovernmental Risk Management Association | 15243 | MO | 1 | 0 | — |
| Missouri Medical Malpractice Joint Underwriting Association | 15246 | MO | 1 | 0 | — |
| Missouri Professionals Mutual-Physicians Professional Indemnity Association | 11582 | MO | 1 | 0 | — |
| Missouri Property and Casualty Insurance Guaranty Association | 15247 | MO | 1 | 0 | — |
| Missouri Property Insurance Placement Facility | 15248 | MO | 1 | 0 | — |
| Missouri United School Insurance Council | 15250 | MO | 1 | 0 | — |
| Missouri Valley Mut Ins Co | 27766 | SD | 1 | 0 | Personal auto, Farm and crop, Homeowners +2 more |
| Mitsui Sumitomo IC (Europe) Ltd | — | UK | 0 | 1 | — |
| Mitsui Sumitomo Insurance Company (Europe) Limited | AA1121410 | UK | 1 | 14 | — |
| Mitsui Sumitomo Insurance Company of America | 20362 | NY | 35 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +18 more |
| Mitsui Sumitomo Insurance USA Inc. | 22551 | NY | 35 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +17 more |
| MLM Risk Retention Group, Inc. | 16026 | DC | 4 | 0 | General liability |
| MLMIC Insurance Company | 34231 | NY | 6 | 0 | — |
| MMG Insurance Company | 15997 | ME | 1 | 0 | Personal auto, General liability |
| MMIC Insurance Inc. | — | MN | 2 | 0 | — |
| MMIC Insurance, Inc. | 16942 | MN | 17 | 0 | General liability, Medical malpractice, Professional liability (E&O) +1 more |
| MMIC Risk Retention Group, Inc. | 14062 | DC | 7 | 0 | General liability, Medical malpractice, Professional liability (E&O) |
| Mobilitas General Insurance Company | 10675 | AZ | 30 | 0 | Personal auto, Commercial auto, Inland marine +4 more |
| Mobilitas Insurance Company | 16392 | AZ | 5 | 18 | Personal auto, Commercial auto, General liability +1 more |
| Mobilitas Insurance Company of Arizona | 16599 | AZ | 0 | 1 | — |
| Modern Service Insurance Company | 23655 | MN | 2 | 0 | — |
| Momentum Risk Retention Group Inc | 16626 | SC | 2 | 0 | Personal auto, General liability, Umbrella and excess |
| Monarch National Insurance Company | 15715 | FL | 1 | 0 | Homeowners, Commercial property (fire and allied lines) |
| Monona County Mutual Insurance Association | 15422 | IA | 1 | 0 | — |
| Monroe County Farmers Mutual Insurance Company | 13899 | MO | 1 | 0 | — |
| Monroe County Mutual Fire Insurance Company | 15976 | TN | 1 | 0 | — |
| Monroe Guaranty Insurance Company | 32506 | IN | 23 | 0 | Personal auto, Equipment breakdown, Commercial auto +12 more |
| Monterey Insurance Company | 23540 | CA | 4 | 0 | Equipment breakdown, Commercial auto, Commercial package (BOP, CMP) +8 more |
| Montgomery Mutual Insurance Company | 14613 | MA | 8 | 0 | Personal auto, Commercial auto, Commercial package (BOP, CMP) +9 more |
| Montpelier Reinsurance Limited | 13921 | NY | 1 | 2 | — |
| Mortgage Guaranty Insurance Corporation | 29858 | WI | 29 | 0 | Credit, General liability, Mortgage guaranty +1 more |
| Mortgage Guaranty Insurance Corporation | — | WI | 2 | 0 | — |
| Motor Club Insurance Company | 12487 | RI | 5 | 0 | Personal auto, Fidelity bonds, General liability +1 more |
| Motor Transport Mutual Risk Retention Group, Inc. | 16700 | AL | 8 | 0 | Personal auto, Commercial auto, Inland marine +2 more |
| Motorists Commercial Mutual Insurance Company | 13331 | OH | 29 | 0 | Personal auto, Equipment breakdown, Commercial auto +12 more |
| Motorists Mutual Insurance Company | 14621 | OH | 18 | 0 | Personal auto, Equipment breakdown, Commercial auto +10 more |
| Motors Insurance Corporation | 22012 | MI | 35 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +14 more |
| Mound Prairie Mutual Insurance Company | — | MN | 1 | 0 | — |
| Mount Carmel Mutual Insurance Association | 15424 | IA | 1 | 0 | — |
| Mount Vernon Specialty Ins . Co. | — | — | 0 | 1 | — |
| Mount Vernon Specialty Insurance Company | 14420 | NE | 8 | 19 | Crime (burglary and theft), Inland marine, General liability +1 more |
| Mountain Lake RRG Inc | 13812 | VT | 4 | 0 | — |
| Mountain Laurel Assurance Company | 44180 | OH | 3 | 0 | Personal auto, Farm and crop, Homeowners +2 more |
| Mountain Laurel Risk Retention Group, Inc. | 11547 | VT | 3 | 0 | — |
| Mountain States Automotive Assurance Risk Retention Group, Inc. | 17579 | FL | 1 | 0 | General liability |
| Mountain States Indemnity Company | 10177 | NM | 7 | 0 | Personal auto, Equipment breakdown, Commercial auto +10 more |
| Mountain Valley Indemnity Company | 10205 | NY | 9 | 0 | Personal auto, Equipment breakdown, Crime (burglary and theft) +9 more |
| Mountain West Farm Bureau Mutual Insurance | 29440 | WY | 1 | 0 | — |
| MountainPoint Insurance Company | 42242 | AZ | 7 | 0 | Personal auto, Equipment breakdown, Crime (burglary and theft) +8 more |
| Mower County Farmers Mutual Insurance Company | — | MN | 1 | 0 | — |
| MS Amlin AG | — | CO | 3 | 0 | — |
| MS Amlin AG - RJ-1460019 | — | CO | 1 | 0 | — |
| MS Transverse Insurance Company | 21075 | TX | 33 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +16 more |
| MS Transverse Specialty Insurance Company | 41807 | TX | 5 | 21 | Aircraft and aviation, Personal auto, Equipment breakdown +19 more |
| MSA Insurance Company | 11066 | SC | 2 | 12 | — |
| MSIG Specialty Insurance America, Inc. | 17864 | DE | 3 | 13 | — |
| MSIG Specialty Insurance USA Inc. | 34886 | NY | 7 | 20 | Personal auto, Commercial auto, Commercial package (BOP, CMP) +6 more |
| Mt. Hawley Insurance Company | 37974 | IL | 4 | 23 | Equipment breakdown, Commercial auto, Commercial package (BOP, CMP) +8 more |
| Mt. Morris Mutual Insurance Company | 10831 | WI | 1 | 0 | Personal auto, Commercial auto, Commercial package (BOP, CMP) +4 more |
| MTAW Insurance Company | 16498 | DE | 21 | 0 | Fidelity bonds, Surety bonds |
| Muenster Farm Mutual Fire Insurance Association, Inc. | — | TX | 1 | 0 | Crime (burglary and theft), Commercial property (fire and allied lines) |
| Munich Re - RJ-1340165 | — | GA | 1 | 0 | — |
| Munich Reinsurance America, Inc. | 10227 | DE | 32 | 0 | Aircraft and aviation, Personal auto, Equipment breakdown +17 more |
| Municipal and Infrastructure Assurance Corporation | 13559 | NY | 3 | 0 | — |
| Municipal Mutual Insurance Company | 10002 | CA | 1 | 0 | — |
| Municipal Mutual Insurance Company of West Virginia | 14656 | WV | 1 | 0 | — |
| Municipal Property Insurance Company | 15779 | WI | 1 | 0 | Personal auto, Commercial auto, Commercial property (fire and allied lines) |
| Mutual Benefit Insurance Company | 14664 | PA | 3 | 0 | — |
| Mutual Insurance Company Of Arizona | 32832 | AZ | 5 | 0 | General liability, Medical malpractice, Professional liability (E&O) |
| Mutual Mennonite Union Aid of Georgia | 05495 | — | 1 | 0 | Farm and crop, Commercial property (fire and allied lines) |
| Mutual of Enumclaw Insurance Company | 14761 | OR | 6 | 0 | Personal auto, Equipment breakdown, Commercial auto +11 more |
| Mutual of Wausau Insurance Corporation | 11617 | WI | 1 | 0 | Commercial package (BOP, CMP), Farm and crop, Homeowners +2 more |
| Mutual Savings Fire Insurance Company | 31178 | AL | 1 | 0 | Ocean marine, Commercial property (fire and allied lines) |
| MutualAid eXchange | 11878 | KS | 6 | 0 | General liability, Ocean marine, Commercial property (fire and allied lines) +1 more |
| The Members Ins Co | 12617 | NC | 1 | 0 | Personal auto, Earthquake, Flood +3 more |
| The Mutual Risk Retention Group, Inc. | 26257 | HI | 9 | 0 | General liability, Medical malpractice, Professional liability (E&O) |
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