| DC Digitalis | Bratislava |
| DCG | Bratislava |
| DealUnity, s.r.o. | |
| Decent SC, s.r.o. | Košice |
| Deep, s.r.o. | |
| dEgart | Trnava |
| Delete, s.r.o. | |
| Delphi SK, s.r.o. | Prešov |
| DeMoTech, s.r.o. | Žilina |
| Detect, s.r.o. | Bratislava |
| DIGI Slovakia | |
| DigiSys Web Services, s.r.o. | Nitra |
| Digital Measure | Košice |
| Digital Solutions, s.r.o. | |
| Digital Systems | |
| Digitale, s.r.o. | |
| DigitalPress | |
| Digitel.sk | |
| Digmia, s.r.o. | Bratislava |
| Dimension 17 | Bratislava |
| Direct Marketing, a.s. | |
| DISKUS, s.r.o. | Trenčín |
| Dispolab, Žilina, s.r.o. | |
| Disweb.sk | Bratislava |
| Ditel, s.r.o. | Žilina |
| DNA ERA, s.r.o. | |
| dob.sk | Bratislava |
| Dominanz, s.r.o. | Bratislava |
| Dopravoprojekt, a.s. | |
| DSi DATA, s.r.o. | Žilina |
| DUMA, s.r.o. | Bratislava |
| Duomedia | Bratislava |
| Dynatech, s.r.o. | Bratislava |
| E-GO, s.r.o. | Trnava |
| e-Sense Slovakia, s.r.o. | |
| E-zone Technologies, s.r.o. | Košice |
| eCall Slovakia, s.r.o. | Bratislava |
| ECOCAPSULE | |
| Edas, s.r.o. | |
| eDoma | |
| EEA | Bratislava |
| EFN plus, s.r.o. | Žilina |
| Ekovital, s.r.o. | |
| Ekusoft.sk, s.r.o. | Trenčín |
| ELBIA, s.r.o. | Banská Bystrica |
| Electronik Servis, spol. s r.o. | Bratislava |
| ELET, s.r.o. | Bratislava |
| Elfa, s.r.o. | Košice |
| Elis, s.r.o. | |
| Elite Solutions | Bratislava |