| NIC Argentina | Buenos Aires |
| Nicso Recuperacion de datos | Buenos Aires |
| Niger Computacion | Buenos Aires |
| Nilus | |
| NIRASYS Design | Buenos Aires |
| NiuX | Buenos Aires |
| Nixe | Buenos Aires |
| Nixel | Buenos Aires |
| Nizzmo | Buenos Aires |
| Nombre Propio | Buenos Aires |
| Nook | Buenos Aires |
| Notion2Sheets | Buenos Aires |
| Novedades | Buenos Aires |
| Novit Software | |
| Nuclemed S.A. | Buenos Aires |
| Núcleo IT | Buenos Aires |
| Numetron | Buenos Aires |
| Nuthost | Buenos Aires |
| NXTP | Buenos Aires |
| Obelisk S.R.L. | Buenos Aires |
| OCS Software | Buenos Aires |
| Odiseo | Buenos Aires |
| Odontsis | Córdoba |
| Oestesi | Buenos Aires |
| Oh!Studio | Buenos Aires |
| Olimpíada Matemática Argentina | Buenos Aires |
| Olimpica | Buenos Aires |
| Omicrom System | Buenos Aires |
| Omnisciens | Buenos Aires |
| Onmarc | |
| Open Solutions | Buenos Aires |
| Opengeeks Solutions | Buenos Aires |
| Openix Soft Consulting | |
| OpenPass | |
| Optima Ingeniera S.A. | Buenos Aires |
| Orbith | |
| Organización y Gestión | Buenos Aires |
| Organización y Sistemas | Buenos Aires |
| Osmosis | Buenos Aires |
| Overall | Buenos Aires |
| Overprint | Buenos Aires |
| P3Design | Buenos Aires |
| PACK agencia | |
| Page Personnel | Buenos Aires |
| pageIMPACT | Buenos Aires |
| Paginar | Buenos Aires |
| Paginas Vendodoras | Buenos Aires |
| Paisanos | |
| Palermo Valley | Buenos Aires |
| Panasonic Service Oficial | Buenos Aires |