| MO |
| Name | Number of records |
| Mobb Deep | 130 |
| Modern Curriculum Press | 244 |
| Modern Language Association of America | 566 |
| Modern Poetry Association. | 270 |
| Momentum Music, Ltd. | 806 |
| Monarchy Enterprises, BV | 612 |
| Monarchy Enterprises, SARL | 672 |
| Montrose Productions, Inc. | 2964 |
| Moo Chewns | 96 |
| Moody Bible Institute, Chicago | 335 |
| Moody Bible Institute of Chicago | 1007 |
| Moo Maison | 108 |
| Morganactive Songs, Inc. | 191 |
| Morgan Creek Productions, Inc. | 948 |
| Morgan Guaranty Trust Company of New York | 425 |
| Morning Star Music Publishers | 352 |
| Morning Sun Books, Inc. | 280 |
| Morton Jonap, Ltd. | 148 |
| Mosaic Music Publishing, LLC | 888 |
| Mosby, Inc. | 1481 |
| Mosby-Year Book, Inc. | 3167 |
| Motown Record Company, L.P. | 853 |
| Motown Record Company, LP | 311 |
| Motown Record Corporation | 635 |
| Motown Songs | 143 |
| Mountain Apple Company | 643 |
| Movietonews, Inc. | 814 |
| Mozart | 142 |
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