| 2004 | LOS CONCE |
| 2004 | LOWE ARGENTINA |
| 2004 | MACH ELECTRONICS |
| 2004 | MACROSA DEL PLATA SA |
| 2004 | MAGY COLOR |
| 2004 | MAKIRTHAL |
| 2004 | MALL SUDAMERICANA S.A. |
| 2004 | MANN+HUMMEL ARGENTINA SA |
| 2004 | MANPOWER |
| 2004 | MAPFRE ARGENTINA |
| 2004 | Marby S.A. |
| 2004 | MARSANS INTERNACIONAL ARGENTINA S.A. |
| 2004 | MARTINEZ |
| 2004 | MARVAL OFARRELL & MAIRAL |
| 2004 | MASS LIFE |
| 2004 | MC CENTER TUCUMAN SRL |
| 2004 | MCI |
| 2004 | MECANICA MOVIL |
| 2004 | MECBER |
| 2004 | MECCO |
| 2004 | MEGATRANS SA |
| 2004 | MERCADO ABIERTO ELECTRONICO |
| 2004 | MERCADO DE LINIERS - OFICINA SAENZ VALIENTE BULLRI |
| 2004 | MERCADO DE VALORES |
| 2004 | MERCEDES BENZ ARGENTINA S.A. |
| 2004 | MERCK S.A. |
| 2004 | MERCOMAR S.A. |
| 2004 | MERITO SA |
| 2004 | META 4 AUTRAL |
| 2004 | METROGAS |