| Infitiny | Attica |
| Info Quest Technologies SA | |
| Infocus | Attica |
| Infolex S.A. | Attica |
| Informal Advertising Ltd | |
| Information Systems Impact | Attica |
| InfoSoft net | Central Greece |
| InnovAthens | |
| Innovative Technologies Centre S.A. | |
| Innovis S.A. | |
| Insoft.gr | Attica |
| Institute of Accelerating Systems and Applications | |
| Intale | |
| Integrated Information Systems | Attica |
| IntelSoft | Attica |
| Interactive Pixels | Attica |
| Interconnect | Attica |
| Interga | Attica |
| Internet at Major | Attica |
| Intersmart | |
| Interworks Single Member S.A. | |
| INTRACOM Defense Electronics | Attica |
| Intracom Holdings S.A. | Attica |
| Intracom Telecom | Attica |
| Intros | Attica |
| Iopen | Thessaly |
| IP.gr | Attica |
| iPhoneRepair.org | Attica |
| IpHost | Attica |
| iQbility | Attica |
| iRepair | Attica |
| iSmart | Attica |
| Isotopon | Attica |
| Isotopon.gr | Attica |
| iSquare | Attica |
| ISTODATA Digital Agency | Attica |
| Istopolis | Attica |
| iSystem | Attica |
| IT Security Pro | |
| Iteam S.A. | Attica |
| ITEL | Attica |
| ITS Services | |
| iWorx | Attica |
| Javaspecialists.eu | Crete |
| JMC AE | Central Greece |
| JoomlaWorks Ltd | Attica |
| JWS | Attica |
| K&G Digital Service | Attica |
| Kaktosweb | Attica |
| Kisware Computer | Attica |