| Bytebrand Outsourcing AG | |
| ByteCode | Vaud |
| Bytelink AG | Zug |
| Bytewise GmbH | |
| C-CIT Sensors AG | |
| C-Motion Consulting AG | Zug |
| Cab Services AG | Basel-Stadt |
| Cadifra | Aargau |
| Cadschool | Geneva |
| Cadtec Switzerland GmbH | Zurich |
| Calerga S.à.r.l. | Vaud |
| Calitime | Lucerne |
| Calypso Biotech S.A. | |
| CAMI S.A. | Neuchâtel |
| Camptocamp S.A. | Vaud |
| Canastra AG | Aargau |
| Candi Solar AG | |
| Canoo | Basel-Stadt |
| CanVirex AG | |
| Caplena AG | |
| Carbogen Amcis Innovations AG | |
| Cardano Foundation | |
| Carlo Gavazzi Holding AG | Zug |
| Carrier Call GmbH | Aargau |
| Carvolution AG | |
| Casasoft.ch | Thurgau |
| CashSentinel S.A. | |
| Cashtronics | Geneva |
| Casper Labs | |
| Cat Consulting | Neuchâtel |
| Causal S.à.r.l. | Fribourg |
| CBS GmbH | Aargau |
| CDQ AG | |
| CDR-Life | |
| CELLEC Biotek AG | |
| Cellestia Biotech AG | |
| Cellis AG | |
| Celonic AG | |
| Celsi AG | Zurich |
| Centi Ltd | |
| Centinated GmbH | Bern |
| Centralschweizerische Kraftwerke AG | Lucerne |
| Centre de Perfectionnement Interprofessionnel | Fribourg |
| Centre ospitalier Universitaire Vaudois | Vaud |
| Centris AG | Solothurn |
| Centro Swizzero di Calcolo Scientifico | |
| Cerbios-Pharma S.A. | |
| CeRFI S.A. | Geneva |
| CERN | Geneva |
| CERN - Information Technology Department | Geneva |