| 2020 | ONCO LIFE SRL |
| 2020 | ONG. CORAZON CARMESI |
| 2020 | OPEN GROUP |
| 2020 | OPTO VISION S.A. |
| 2020 | ORAZUL ENERGY |
| 2020 | ORBIS MERTIG SAIC |
| 2020 | ORGANIZACION TECHINT S.A DIVISION TELECOMUNICACIONES (TESUR) |
| 2020 | Orien S.A. |
| 2020 | ORIGENES |
| 2020 | Oscar Barbieri S.A. |
| 2020 | OSCAR BRUNO ADMINISTRACION DE CONSORCIOS |
| 2020 | OSDOP - OBRA SOCIAL DE DOCENTES PARTICULARES |
| 2020 | Osmotica Pharmaceutical |
| 2020 | OSOETSYLRA |
| 2020 | OSPACA |
| 2020 | OSPRERA |
| 2020 | Otis Argentina S.A. |
| 2020 | OTTOBOCK ARGENTINA S.A. |
| 2020 | OUTSOURCE SRL |
| 2020 | OXY NET S.A. |
| 2020 | PAGINA 12 |
| 2020 | PAGO FACIL |
| 2020 | PALLARO HNOS. S.A. |
| 2020 | PAMATEX |
| 2020 | PAMI |
| 2020 | PAMI - ARCHIVOS |
| 2020 | PAMI - CENTRO DE COMPUTOS |
| 2020 | PAMI - FARMALINK |
| 2020 | PAMI - ITUZAINGO |
| 2020 | PAMI - RECURSOS FISICOS |