| Mobius-Datalex AE | Attica |
| MP & Associates | Attica |
| Msystems | |
| Multi Travel | Attica |
| MultiHosting | Attica |
| Multisoft | Attica |
| Mundo GR | Attica |
| MUSE Robotics, Inc. | Attica |
| mybusiness360 | Central Macedonia |
| Nadenco | |
| Naftilos Technology Stores | Attica |
| Naftilosweb | Attica |
| Natech Financial Software | Attica |
| National Bank of Greece | Attica |
| National Center for Scientific Research "Demokritos" | Attica |
| National Centre for Scientific Research "Demokritos" - Institute of Informatics and Telecommunications | Attica |
| National Kapodistrian University of Athens | |
| National Technical University of Athens - Department of Mathematics | Attica |
| National Technical University of Athens - School of Electrical and Computer Engineering | Attica |
| NeatCSS | Attica |
| Nelios | Attica |
| Net Media | Attica |
| Net One | Attica |
| Net Root | |
| Net360 | Attica |
| Netculture | Attica |
| NetDesigns.gr | Attica |
| NetPixel | Attica |
| Netscope S.A. | Attica |
| Netstudio | Attica |
| Netwar | Attica |
| netWire | Attica |
| Netwise | |
| Neunen IKE | Central Macedonia |
| Neurosoft S.A. | Attica |
| New Media | Attica |
| Newsphone | |
| Newtech | Attica |
| Next | Attica |
| Nitro Web Development | Central Macedonia |
| Noemax Technologies Ltd | Attica |
| Noetik | Attica |
| Nomitech | Attica |
| Nova | |
| NTRATECH Ltd | |
| Nummuspay | Attica |
| Odyssey Venture Partners | Attica |
| OK!Thess | |
| OKTO | |
| Olympia Electronics | Attica |