| Koun.gr | Attica |
| Kryptium | |
| KS-Net.gr | Attica |
| Lab3Web | |
| Lambda Automata | |
| Lambda.gr | Attica |
| LaptopService.gr | Attica |
| Lavipharm | Attica |
| Lavisoft SM S.A. | |
| Lemco Electronics | Attica |
| Libre Space Foundation | |
| Liknosoftware | Attica |
| Lime Creative | Attica |
| Lime Technology | |
| Linux Greece | Attica |
| Linx - Internet Solutions & Services | Attica |
| Little Monster | Central Macedonia |
| Localscope | |
| Locosms | Attica |
| LogicWave | |
| Lucky Host | Central Macedonia |
| M-Data | Attica |
| M-STAT S.A. | |
| Madiacube | Attica |
| Mageguide | |
| Magiq Doorz | Attica |
| Mailbox.gr | Attica |
| Makis.TV | Attica |
| Manbiz | Attica |
| Map4U Ltd | |
| Marathon Venture Capital | |
| Marinet | |
| Markware Studios | Attica |
| Master Advertising | |
| MatelCom | Attica |
| MBS College of Crete | |
| MCOM Media Communications S.A. | Attica |
| Mediapath | Attica |
| MediPass | |
| MediSign | Attica |
| Mediterranean College | |
| MedNet Greece S.A. | |
| Melon Web | Attica |
| Metavallon | |
| Metro Audio Systems | Attica |
| Mevart Creative Design | |
| MG Manager | Attica |
| MGCode | |
| Micro's Leader S.A. | Attica |
| Microsoft Hellas | Attica |