| K |
| Name | Number of records |
| Kaeden Corporation | 176 |
| Kalmbach Publishing Company | 766 |
| Kamakazi Music Corporation | 100 |
| Kamico Instructional Media, Inc. | 395 |
| Kapagama, SA | 155 |
| Kaplan, Inc. | 391 |
| Katja Motion Picture Corporation. | 912 |
| Kear Music | 139 |
| Kendall/Hunt Publishing Company | 7948 |
| Kendall/Hunt Publishing Company. | 6988 |
| Kendor Music, Inc. | 134 |
| Kenneth Copeland Ministries | 263 |
| Kenneth Copeland Publications | 162 |
| Kenneth Hagin Ministries, Inc. | 595 |
| Kensington Publishing Corporation | 212 |
| Kent State University Press | 517 |
| Key Curriculum Press | 171 |
| Kharatroy Music | 190 |
| Kidsbooks, Inc. | 198 |
| Killer Tracks | 350 |
| Kimbo Educational | 161 |
| Kim Williams Music | 122 |
| Kinetic Diamond Music, Inc. | 223 |
| King Biscuit Records, LLC | 984 |
| King Coal Music, Inc. | 227 |
| King Features Entertainment, Inc. | 345 |
| King Features Syndicate, Inc. | 1155 |
| Kings Road Entertainment, Inc. | 466 |
| Kiss | 223 |
| Kjos Music Press | 194 |
| Kluwer Academic Publishers | 2976 |
| Knowles Publishing, Inc. | 405 |
| Koch International Classics | 295 |
| KOCH International Classics | 244 |
| Kodansha, Ltd. | 197 |
| Kohaw Music, Inc. | 282 |
| Koppelman-Bandier Music Corporation | 385 |
| Korean Television Enterprises, Ltd. | 4817 |
| Korn | 102 |
| KPM Music Library | 304 |
| Krames Communications | 1291 |
| Krause Publications | 963 |
| KRS-One | 149 |
| Kubaney Publishing Corporation | 724 |
| Kushner Locke Company | 157 |
| Kushner-Locke Company | 667 |
| Kybama Music, Inc. | 461 |
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