| Centre de Perfectionnement Interprofessionnel | Fribourg |
| Centre Européen de Calcul Atomique et Moléculaire | |
| Centre ospitalier Universitaire Vaudois | Vaud |
| Centre Suisse d’Electronique et de Microtechnique S.A. | |
| Centris AG | Solothurn |
| Centro Swizzero di Calcolo Scientifico | |
| Centrue AG | |
| Cerbios-Pharma S.A. | |
| CeRFI S.A. | Geneva |
| CERN | Geneva |
| CERN - Information Technology Department | Geneva |
| Cerrion AG | |
| Certifaction AG | |
| Certus Molecular Diagnostics AG | |
| CFI S.A. | Neuchâtel |
| CFS Engineering S.A. | |
| CG24 Group AG | |
| CH Open | Bern |
| Chain4Travel AG | |
| ChainSecurity | |
| CHANGINS | |
| Chemspeed | |
| Cheye Visuelle Kommunikation | Grisons |
| China Europe International Business School, CEIBS Switzerland AG | |
| Chipmind AG | |
| Chiral Nano AG | |
| chm-studio | Zurich |
| Chorus One | |
| Chrisign GmbH | Thurgau |
| Cicor Management AG | St. Gallen |
| Cilag AG | |
| CIS Pharma AG | |
| Cisel | Fribourg |
| Citizen Space Zurich | |
| Citrin Informatik GmbH | Zurich |
| Citycable | Vaud |
| ClassOwl | |
| Cleanmail AG | Vaud |
| Cleanmedia Mercurio | Bern |
| Clear Design Experts | |
| ClearSpace | Vaud |
| Clemap AG | |
| Clément Business Services | Vaud |
| Clientis AG | |
| Climeworks | |
| Cloudrexx | Bern |
| cloudscale.ch Ltd | Zurich |
| CloudSigma | |
| CloudSigma Holding AG | Zurich |
| CLST | |