| CMO Consulting S.à.r.l. | Vaud |
| cnlab AG | St. Gallen |
| Cobra Software AG | Basel-Landschaft |
| CodX Software AG | Zurich |
| Cofex AG | Zurich |
| Cogestra-Laser S.A. | Geneva |
| Cogniweb S.A. | Valais |
| Collabree Ltd | |
| Collateral Good | |
| collectID AG | |
| Colyns Web Solutions | Bern |
| com2b.ch GmbH | Zurich |
| Comatic AG | Lucerne |
| ComatReleco Ltd | Bern |
| Combioxin S.A. | |
| ComBridge AG | St. Gallen |
| Comcepta AG | Basel-Stadt |
| Comerge AG | |
| Comfone AG | Bern |
| Comgate Solutions AG | Bern |
| Comlabs Informatik GmbH | Basel-Landschaft |
| compart Engineering AG | Bern |
| Compass IT AG | Basel-Stadt |
| comperio.ch AG | Bern |
| Comphya S.A. | |
| Compnet | Zurich |
| Compona AG | Zurich |
| Composable Foundation | |
| CompPair | |
| CompPair Technologies Ltd | |
| Compremium AG | |
| Compu-Trade GmbH | Bern |
| Computer Controls AG | Zurich |
| Computer Rock | |
| Computer Software und Netzwerke AG | Basel-Stadt |
| Computer-Point | Zurich |
| Computerfuchs AG | Bern |
| Computerline GmbH | Lucerne |
| Computerworld.ch | Zurich |
| Comrec GmbH | Bern |
| Comsolit AG | Thurgau |
| Comsolutions Kommunikations - Lösungen GmbH | Schwyz |
| Comvation AG | Bern |
| Comworld GmbH | Schwyz |
| Concept Mag S.à.r.l. | Valais |
| Concepto | Vaud |
| Concetweb | Fribourg |
| Concordium | |
| Confecta AG | Thurgau |
| Confédération suisse - Département fédéral de l'environnement, des transports, de l'énergie et de la communication | |