| CloudTalk | |
| CMD, s.r.o. | Bratislava |
| ColosseoEAS, a.s. | |
| Comcas, s.r.o. | Prešov |
| Comenius University - Department of Applied Mathematics and Statistics | Bratislava |
| ComErgon, s.r.o. | Bratislava |
| Comixu, spol. s r.o. | Nitra |
| Commercium, spol. s.r.o. | |
| Commodity, s.r.o. | |
| CompAct spol. s.r.o. | |
| CompTel.sk | Trnava |
| Computer ABC, s.r.o. | Nitra |
| Computer Club | Nitra |
| Conelec, s.r.o. | |
| Connect Coworking | |
| Consilium Consulting, s.r.o. | |
| ConsultOne, s.r.o. | Bratislava |
| ControlSystem, s.r.o. | |
| CoverPage | |
| CPD Systems Slovakia, s.r.o. | |
| CPP trade, a.s. | |
| CQ servic e, spol. s r.o. | |
| CRAP, s.r.o. | Bratislava |
| CREA.TIFF studio | Trnava |
| CREATE SK, s.r.o. | Žilina |
| Creative Sites | Bratislava |
| Creative Studio, s.r.o. | |
| Crowdberry | |
| Crystal Consulting, s.r.o. | |
| Crystal Group, s.r.o. | Trenčín |
| ČSOB | |
| Cubetech, s.r.o. | |
| Čulen a Partner, s.r.o. | |
| 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 |