| 2019 | Orien S.A. |
| 2019 | ORLOSH - ORL MEDIC S.A. |
| 2019 | ORLY SACIF |
| 2019 | Oscar Barbieri S.A. |
| 2019 | OSETYA - OBRA SOCIAL DE EMPLEADOS TEXTILES Y AFINES |
| 2019 | OSFE - OBRA SOCIAL FERROVIARIA |
| 2019 | OSIAD SALUD |
| 2019 | Osmotica Pharmaceutical |
| 2019 | OSPACA |
| 2019 | OSPIM - OBRA SOCIAL DEL PERSONAL DE LA INDUSTRIA MOLINERA |
| 2019 | OSPRERA |
| 2019 | OSTEL - OBRA SOCIAL DEL PERSONAL TELEFONICO |
| 2019 | OTTOBOCK ARGENTINA S.A. |
| 2019 | OUTSOURCE SRL |
| 2019 | OXY NET S.A. |
| 2019 | PAGINA 12 |
| 2019 | PAGO FACIL |
| 2019 | PALLARO HNOS. S.A. |
| 2019 | PAMATEX |
| 2019 | PAMI |
| 2019 | PAMI - ARCHIVOS |
| 2019 | PAMI - CENTRO DE COMPUTOS |
| 2019 | PAMI - FARMALINK |
| 2019 | PAMI - FLORENCIO VARELA |
| 2019 | PAMI - ITUZAINGO |
| 2019 | PAMI - MERLO AGENCIA 29 |
| 2019 | PAMI - RECURSOS FISICOS |
| 2019 | PAMI - SUIPACHA |
| 2019 | PAMI 3 |
| 2019 | PAMI 8 |