| Enterprise Greece | |
| Enwrite | |
| Epilogi.net | West Greece |
| Epinoisis Software | Attica |
| Eproductions | Attica |
| Epsilon Group | Attica |
| Epsilon Net S.A. | |
| Ergon Iris | Attica |
| ES Systems | Attica |
| eTelestia | Central Macedonia |
| Euditi | |
| Eunet.gr | Attica |
| Euroconsultants S.A. | Attica |
| EuroDry Ltd | |
| Euromach S.A. | |
| European Association for Theoretical Computer Science | West Greece |
| European Dynamics | Attica |
| European Union Agency for Network and Information Security | Attica |
| Euroseas Ltd | |
| Eurotel Hospitality A.E. | |
| EVRESIS A.E. | Attica |
| Eworx S.A. | Attica |
| Ex Machina | |
| Exentric | Attica |
| EXIS | |
| Exist | Attica |
| Exodus S.A. | Attica |
| EXPO Power Systems S.A. | |
| Extra Security | Attica |
| Eyelead Software | Attica |
| EyeWide Digital Marketing | Crete |
| Fast Hosting | Attica |
| FCNet Web Solutions | Attica |
| Feron Technologies P.C. | Attica |
| Firewall.cx | Central Macedonia |
| Fixit | |
| Flexfin Ltd | |
| Flip | Attica |
| Flowcreations | |
| Foodtech | |
| Forestview | Attica |
| Forth Institute of Computer Science | Crete |
| Fortune Technologies S.A. | Attica |
| Forward e-business Ltd | Attica |
| Found.ation | |
| Foundation for Research and Technology - Hellas | |
| Foundation for Research and Technology - Hellas - Institute of Applied and Computational Mathematics | Crete |
| FrankMayer.net | Attica |
| Freelancing | Attica |
| Freeset | Attica |