- CSL Immobilien AG
- CSL Vifor
- CSP AG
- CSS Versicherung
- CTA AG
- CTC
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- CTC AG
- CTC Clinical Trial Consulting
- CTC Resourcing
- CTC Resourcing Solutions
- CTC Resourcing solutions
- CTC Resourcing Soutions
- CTS - Congrès, Tourisme et Sport SA
- Cucaracha
- Cuénod & Payot Chablais SA
- Cuénod Payot Chablais SA Entreprise de travaux publics et bâtiments
- Cuisines Riviera
- Culligan Switzerland SA
- Cultibio sàrl
- Cultural Care Au Pair
- Culture Valais Kultur Wallis
- cura mentis gmbh
- Curaden AG
- CURAdomizil AG, Ihre Spitex in der Nordwestschweiz
- curafutura - Die innovativen Krankenversicherer
- Curavero Michèle Friedli
- Curea Elektro AG
- Curtis Instruments AG
- Curtiss Wright Antriebstechnik GmbH
- Custodigit AG
- Customize AG
- Cut + Color
- CUTISS AG
- CV-POP SA
- CVO-Europe SA
- CVSTOS The Time Keeper SA
- CW Elektro Windmeier GmbH
- CWA Constructions SA/Corp.
- CWS-boco Suisse SA
- CXB Partner
- Cybelec SA
- Cybersystems GmbH
- Cybertron Tech GmbH
- cynkra
- CyOne Security AG
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