| MARKEL INSURANCE COMPANY | — | F10450310 | 2005-01-01 | Active | GLEN ALLEN |
| MARKEL INTERNATIONAL INSURANCE COMPANY LIMITED | — | F10419513 | 2005-01-01 | Active | DEERFIELD |
| MARLIGEN BIOSCIENCES, INC | — | F06928568 | 2002-07-29 | Suspended | IJAMSVILLE |
| MARQUETTE NATIONAL LIFE INSURANCE COMPANY | — | F10467058 | 2005-01-01 | Active | LAKE MARY |
| MASSACHUSETTS BAY INSURANCE COMPANY | — | F10491603 | 2005-01-01 | Active | BEDFORD |
| MATTHEWS SUBDIVISION WATER COMPANY, INC | — | D00653220 | 1965-05-25 | Suspended | LA PLATA |
| MAXUM INDEMNITY COMPANY | — | F10466886 | 2005-01-01 | Active | DULUTH |
| MAYFLOWER INSURANCE COMPANY, LTD., THE | — | F10450336 | 2005-01-01 | Dissolved | CHICAGO |
| MAYFLOWER NATIONAL LIFE INSURANCE COMPANY | — | F10467082 | 2005-01-01 | Active | NEW ORLEANS |
| MB CONSTRUCTION AND MAINTENANCE GROUP, INC | — | D12017950 | 2007-07-11 | Dissolved | |
| MBIA INSURANCE CORPORATION | — | F10450369 | 2005-01-01 | Active | AMONK |
| MCMANAMEY & MCMANAMEY INC | — | F10475895 | 2005-01-01 | Active | RESTON |
| MEDCO CONTAINMENT LIFE INSURANCE COMPANY | — | F10467108 | 2005-01-01 | Active | MONTVALE |
| MEDICAL LIABILITY MUTUAL INSURANCE COMPANY | — | F10450377 | 2005-01-01 | Active | LATHAM |
| MEDICAL LIFE INSURANCE COMPANY | — | F10467132 | 2005-01-01 | Active | CLEVELAND |
| MEDICAL PROTECTIVE COMPANY | — | F10450385 | 2005-01-01 | Active | FORT WAYNE |
| MEDICO LIFE INSURANCE COMPANY | — | F10467140 | 2005-01-01 | Active | OMAHA |
| MEDMARC CASUALTY INSURANCE COMPANY | — | F10450401 | 2005-01-01 | Active | CHANTILLY |
| MEDMARC MUTUAL INSURANCE COMPANY | — | F10419547 | 2005-01-01 | Active | CHANTILLY |
| MEGA LIFE AND HEALTH INSURANCE COMPANY | — | F10467249 | 2005-01-01 | Active | NORTH RICHLAND HILLS |
| MEMBERS HEALTH INSURANCE COMPANY | — | F10481372 | 2005-01-01 | Active | LANSING |
| MEMBERS LIFE INSURANCE COMPANY | — | F10467256 | 2005-01-01 | Active | MADISON |
| MERASTAR INSURANCE COMPANY | — | F10451169 | 2005-01-01 | Active | CHATTANOOGA |
| MERCHANTS BONDING COMPANY(MUTUAL | — | F10451193 | 2005-01-01 | Active | DES MOINES |
| MERIDIAN CITIZENS MUTUAL INSURANCE COMPANY | — | F10451201 | 2005-01-01 | Active | INDIANAPOLIS |
| MERIDIAN SECURITY INSURANCE COMPANY | — | F10451227 | 2005-01-01 | Active | INDIANAPOLIS |
| METLIFE INVESTORS INSURANCE COMPANY | — | F10467280 | 2005-01-01 | Suspended | IRVINE |
| MGA INSURANCE COMPANY | — | F10451540 | 2005-01-01 | Active | FORT WORTH |
| MGIC ASSURANCE CORPORATION | — | F10451557 | 2005-01-01 | Active | MILWAUKEE |
| MGIC CREDIT ASSURANCE CORPORATION | — | F10451581 | 2005-01-01 | Active | MILWAUKEE |
| MGIC INDEMNITY CORPORATION | — | F10451599 | 2005-01-01 | Active | MILWAUKEE |
| MGIC MORTGAGE REINSURANCE CORPORATION | — | F10451623 | 2005-01-01 | Active | MILWAUKEE |
| MGIC REINSURANCE CORPORATION | — | F10451250 | 2005-01-01 | Active | MILWAUKEE |
| MGIC RESIDENTIAL REINSURANCE CORPORATION | — | F10452571 | 2005-01-01 | Active | MILWAUKEE |
| MIC GENERAL INSURANCE CORPORATION | — | F10452589 | 2005-01-01 | Active | SOUTHFIELD |
| MIC PROPERTY AND CASUALTY INSURANCE CORPORATION | — | F10452597 | 2005-01-01 | Active | SOUTHFIELD |
| MID-AMERICA INSURANCE COMPANY | — | F10419562 | 2005-01-01 | Active | HARLEYSVILLE |
| MID-CENTURY INSURANCE COMPANY | — | F10452605 | 2005-01-01 | Active | GRAND RAPIDS |
| MID-CONTINENT INSURANCE COMPANY | — | F10438018 | 2005-01-01 | Active | SOMERSET |
| MID-SOUTH INSURANCE COMPANY | — | F10467348 | 2005-01-01 | Active | RICHMOND |
| MID-WEST NATIONAL LIFE INSURANCE COMPANY OF TENNESSEE | — | F10467405 | 2005-01-01 | Active | North Richland HIlls |
| MIDAMERICA LIFE INSURANCE COMPANY | — | F10467330 | 2005-01-01 | Active | OMAHA |
| MIDDLESEX INSURANCE COMPANY | — | F10438026 | 2005-01-01 | Active | STEVENS POINT |
| MIDWEST EMPLOYERS CASUALTY COMPANY | — | F10438083 | 2005-01-01 | Active | MARYLAND HEIGHTS |
| MIIX INSURANCE COMPANY | — | F10438133 | 2005-01-01 | Active | LAWRENCEVILLE |
| MILBANK INSURANCE COMPANY | — | F10438141 | 2005-01-01 | Active | MILBANK |
| MILLERS CAPITAL INSURANCE COMPANY | — | F10438174 | 2005-01-01 | Active | HARRISBURG |
| MILWAUKEE INSURANCE COMPANY | — | F10419596 | 2005-01-01 | Active | BROOKFIELD |
| MINNESOTA LAWYERS MUTUAL INSURANCE COMPANY | — | F10438844 | 2005-01-01 | Active | MINNEAPOLIS |
| MISSION LIFE INSURANCE COMPANY OF AMERICA | — | F10467413 | 2005-01-01 | Active | ARMONK |