| M |
| Name | Number of records |
| MBC America | 3066 |
| M.E. Sharpe, Inc. | 2081 |
| MGM Global Holdings, Inc. | 464 |
| MGM Television | 143 |
| MGM Television Entertainment, Inc. | 850 |
| MGM/UA, Inc. | 781 |
| MGM/UA Television Productions, Inc. | 260 |
| MGM Worldwide Television Productions, Inc. | 253 |
| M.M. Cole Publishing Company | 172 |
| MMO Music Group, Inc. | 1048 |
| MPL Communications, Inc. | 373 |
| MRG Entertainment, Inc. | 369 |
| MRM-Marathon | 260 |
| MTE, Inc. | 344 |
| MTM Enterprises | 332 |
| MTM Enterprises, Inc. | 1696 |
| MTM Music Group. Lawyer's Daughter Music | 278 |
| MTS International, Inc. | 635 |
| MTV Networks | 301 |
| M. Witmark & Sons. | 702 |
| Mycenae Music | 264 |
| MyNetworkTV, Inc. | 612 |
| Mystique Films, Inc. | 203 |
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