| Citerus | Stockholm |
| City Cloud | Blekinge |
| Cixit AB | Västmanland |
| Claims Carbon Institute AB | |
| Clavister | Västernorrland |
| Clean Motion | |
| Cleura AB | |
| Clever AB | |
| Clevexel Pharma AB | |
| Cliento | Stockholm |
| ClimateView AB | |
| Cling Systems AB | |
| Clipsource | |
| Cloover Sustainability AB | |
| Cloover Sustainability AB | |
| Cloud Capital | |
| Cloud Connection | |
| Cloud Enablers | |
| Cloud Nine | |
| CloudBackend AB | |
| CloudConnected Sweden AB | Stockholm |
| CloudMe AB | Östergötland |
| Cloudmore | Stockholm |
| Cloudmore AB | |
| Cloudwiser AB | |
| ClowID | |
| Clusterland Sweden | |
| CNet Svenska AB | Stockholm |
| Co-X | |
| Co.Society | |
| Coachendo | |
| Coala Life | |
| Code Club AB | Östergötland |
| Codeball | |
| CodeEasy | |
| Codemill | |
| Codepeak AB | |
| Codepole | |
| CodeScene | |
| Coegin Pharma AB | |
| Cognibotics AB | |
| Colearn AB | |
| Colive | |
| Colix | |
| Collactivate AB | |
| Collegial AB | |
| Color Monkey | |
| Coloreel | |
| Colzyx AB | |
| Combify AB | |