Bedrift C - Røyken
- Cacea AS
- Carho AS
- Cenian AS
- Cm Entreprenør AS
- Christian Schibsted
- Ccleaf Ali
- Campus Marine AS
- Ci Coaching AS
- Cbek Holding AS
- Calor Consult AS
- Callejas Enterprise
- Cb Bygg AS
- Cbtools.no AS
- Carlén Holding AS
- Classic Pizza AS
- Care for You DA
- Chamajo Norge Lien
- Cloud Nine Norway AS
- Cultural Delights Ungdomsbedrift
- Cnc Operatøren Håvar Skille
- Ceu Lian Sang Thangeng
- Custom Vinyl Arve Løken
- Cary Røyken - Smarter car care