| AR |
| Name | Number of records |
| Arbitron, Inc. | 2537 |
| Archie Comic Publications, Inc. | 983 |
| Arc Music Corporation | 461 |
| Arc Music Corporation. | 358 |
| Ariel Books | 231 |
| Ariose Music | 711 |
| Arisav Music | 127 |
| Arista Music, Inc. | 452 |
| Arista Records, Inc. | 1078 |
| Arista Records, LLC | 531 |
| Arizona. Board of Regents | 1066 |
| Arrangers' Publishing Company, Inc. | 126 |
| Art Appraisers of America, Ltd. | 364 |
| Artbeats Software, Inc. | 446 |
| Artech House, Inc. | 973 |
| Artheme Fayard Librairie | 969 |
| Arthur Company & Associates | 250 |
| Artisan Home Entertainment, Inc. | 419 |
| Artisan Pictures, Inc. | 800 |
| Art Masters Studios, Inc. | 566 |
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