Firma C - Rykkinn
- Cassaforte AS
- Chica
- Ceths AS
- Contextual
- Chronovisor AS
- Caschedenier AS
- Chargerly AS
- Coachinvest AS
- Compositae AS
- Csg AS
- Cafe Espresso
- Cosa Nostra AS
- Cn Transport AS
- Chrono Capital AS
- Consulting Djønne
- Clone Force AS
- Christoffersen Trampolinemontering
- Chintz Vibeke Samkopf
- Car Protect.no AS
- C. E. Jahr
- Clas Ohlson Rykkinn
- Cp Nordic.no AS
- Cd Christian Dahl
- Consus Rune Solstad
- Christine Wille Jordheim
- Conrad Olsen Data-Service
- Cordero Service Gladys Gruz
- Consultant Bemanningsbyrå og Rekruttering AS
- Coor Service Management AS Avd Ops Rykkinn
- Cab Norge Kåre Helge Tornes
- Coor Cleaning Catering And Property Avd Renhold Ops Rykkin