Firma C - Oppsal
- Constravia AS
- Cleanit AS
- Canoon
- Compelling AS
- Canoon
- Chrisbi AS
- Contenti AS
- Codling
- Charity Ochiriozo
- Constravia Invest AS
- Creative Destruction AS
- Cecilie Rubach
- Collettmüller Invest AS
- Cartigny Holding AS
- Camilla Krogstie
- Celmer Pol
- Christoffer Landstad
- Camilla Bjørnsen
- Cembo Production DA
- Charlotte Fladvad
- Coach Hammerstad
- Cnh Holding AS
- Click Lab Beslic
- Contentas T. Aasen
- Cinemattis Mattis Koppang
- Coop Prix Oppsalstubben
- Cathrine Birgitte Skar
- Cardio Kickboxing Wick
- Coop Prix Østmarkveien
- Camilla Brinchmann Musikk
- Calins Hageservice og Renhold
- Cristian Ruiz Studio-R
- Citizen Aspire for Sdgs
- Citizen Aspire for Sdgs
- Consult.Imers Ola Imerslund
- Coaching med Kathrine Nilsen
- Carvalho de Jesus Comes Byggservice
- Cardio Kickboxing & Camp Kalori AS
- Cooper Consulting Norway & East Africa
- Creationoslo AS - Eventyrlig Teater på Uvanlige Steder
- Custom Tattoo By Tony Jan Tony Nilsson