| 2013 | OMAR Y MILTON RODRIGUEZ S.A. |
| 2013 | OMEGA TOUR |
| 2013 | OMILL |
| 2013 | OMINT |
| 2013 | OMNI SALUD |
| 2013 | OPEN GROUP |
| 2013 | OPEN RADIO |
| 2013 | OPESA |
| 2013 | OPESSA ACA ONCE |
| 2013 | OPS S.A.C.I. |
| 2013 | OPSM |
| 2013 | OPTICA NUEVA VISION - ROSARIO |
| 2013 | OPTO VISION S.A. |
| 2013 | ORACLE ARG. S.A. |
| 2013 | ORAZUL ENERGY |
| 2013 | ORBIS MERTIG SAIC |
| 2013 | ORGANIC LATIN AMERICA S.A. |
| 2013 | Organización Del Bachillerato Internacional |
| 2013 | ORGANIZACION MARQUEZ |
| 2013 | ORGANIZACION PALERMO |
| 2013 | ORGANIZACION PRYSMA SH |
| 2013 | ORGANIZACION TECHINT |
| 2013 | ORIENTAL FARMACEUTICA ICISA |
| 2013 | ORIENTAR CON SENTIDO S.R.L. |
| 2013 | ORIGENES |
| 2013 | ORNA |
| 2013 | OSDE - BINARIA SEGUROS |
| 2013 | OSDEPYM |
| 2013 | OSEIV |
| 2013 | OSPEDYC - UTEDYC |