| EUDomains.sk | Bratislava |
| Euro Media Košice, s.r.o. | |
| EuroNET Slovakia, s.r.o. | Trenčín |
| Európsky inštitút ďalšieho vzdelávania | |
| EuroReklama.sk | Bratislava |
| EuroServer.sk | Banská Bystrica |
| Evelon, s.r.o. | Bratislava |
| Evolit Slovakia, s.r.o. | |
| Evona | |
| exe.sk | Bratislava |
| Exel, s.r.o. | Banská Bystrica |
| EXO hosting | Prešov |
| Exo Technologies, spol. s r.o. | Bratislava |
| EXOT, s.r.o. | Bratislava |
| FatChilli.com | Bratislava |
| Fevra, spol. s r.o. | |
| FileJet | |
| Filip M & W, spol. s r.o. | Bratislava |
| Finby | |
| Fine, s.r.o. | Žilina |
| FinGO.sk | |
| FLEX-IS, spol. s r.o. | Bratislava |
| Flowy | |
| Focus-computer, spol. s .r.o. | |
| Foliovision, s.r.o. | Bratislava |
| Fond inovácií a technológií, a.s. | |
| Fonet, spol. s r.o. | Trenčín |
| Foresta Sk, a.s. | |
| Forma, s.r.o. | |
| Forsam, spol. s r.o. | |
| FortKnox Personal Firewall | Trenčín |
| Forvio, s.r.o. | |
| Foundation, s.r.o. | Bratislava |
| FPT Slovakia | |
| FreeNETsk, s.r.o. | |
| Freeserver | Bratislava |
| Freevision | |
| Frio Media, s.r.o. | Trenčín |
| Fuergy | |
| Fumbi Network j. s. a. | |
| FutureNow, s.r.o. | |
| Futurista Projects | |
| Futurum, s.r.o. | |
| G-comp, s.r.o. | Košice |
| G4 Investments | |
| GA Drilling, a.s. | |
| GALTON Brands | |
| Game Platforma, s.r.o. | |
| GAMO, a.s. | Banská Bystrica |
| Garwan k.s. | |