| CulturePulse | |
| DASE | |
| DasingPC.sk | Žilina |
| DASTIN, s.r.o. | Košice |
| Data on Steroids, s.r.o. | |
| Data Security Consulting, s.r.o. | |
| Datacorp, s.r.o. | Bratislava |
| Dataflowkit | |
| Datagen.sk | Nitra |
| Datalan | Bratislava |
| Datamark | Bratislava |
| DATAREC | Bratislava |
| Datasun, s.r.o. | Nitra |
| Dataware, s.r.o. | Bratislava |
| DATex LC, s.r.o. | Banská Bystrica |
| DB Biotech, a.s. | |
| DBConvert | Bratislava |
| 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 |
| DeMi Studio, s.r.o. | |
| DeMoTech, s.r.o. | Žilina |
| Detect, s.r.o. | Bratislava |
| DIGI Slovakia | |
| DigiSys Web Services, s.r.o. | Nitra |
| Digital Measure | Košice |
| Digital Solutions Studio, s.r.o. | |
| Digital Solutions, s.r.o. | |
| Digital Systems | |
| Digitale, s.r.o. | |
| DigitalPress | Bratislava |
| 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 |