| ▲Nombre▼⊗ | ▲País▼≋ | ▲Provincia▼ | ▲#▽ |
|---|---|---|---|
| Mercury Record | EE.UU. | Chicago | 1 |
| Materia Oscura | España | Madrid | 1 |
| Mary Gnaedinger (The Frank A. Munsey Company) | EE.UU. | Brooklyn, New York City | 1 |
| Markosia | Gran Bretaña | Londres | 1 |
| Maqui Edicions | España | Gerona | 1 |
| La Magnífica | España | Madrid | 1 |