| Name | Region |
|---|---|
| Corbina Telecom | Kiev |
| CORE Team | |
| Cosmos Studio | |
| Cowokring 365 | |
| COwork direct | |
| Coworking Club | |
| Coworking Zone | |
| CP-Lab.com | Kiev |
| CrazySoft | Kiev |
| Creastate | Kharkiv |
| Createx Studio | |
| Creative Quarter | |
| Creative States | |
| Crisp Studio | Kiev |
| Crumina | |
| Crunch.is | Lviv |
| Cryeye | |
| CS Ltd | |
| CTLine | Kiev |
| Cultum | |
| Culver Aviation | |
| Cupertino | Kiev |
| Custom4Web | |
| Cutting-edge Games Conference | Kiev |
| CYA-ST Software | Chernivtsi |
| Cyber School | |
| Cyber Unit Technologies | |
| CyberBionic Systematics | Kiev |
| CyberGrow | |
| Cyborgs.pro | |
| D2 | Kiev |
| d2n8 | Kiev |
| DA-14 | Kharkiv |
| Da.net Systems | Kiev |
| DadcomGames | |
| DAN IT Education | |
| Danialart Studio | |
| Dark Hosting | Dnipropetrovsk |
| DarkWood | Kiev |
| Data Science UA | |
| DataForest | Kiev |
| DataForSEO | |
| Dataisland | |
| Dataline LLC | Kiev |
| DataMix | Kiev |
| DataRoot Labs, Inc. | |
| Datawiz, Inc. | |
| DataX Ltd | Zaporizhzhia |
| DCitic | Kiev |
| Dcoast Studio |