Bedrift C - Grålum
- Colligo AS
- Chrisko AS
- Capitech AS
- Clausen Jorunn
- Chen Pongsri
- Che Holding AS
- Check Accounting AS
- C&D Holding AS
- Cramo AS (Grålum)
- Center Revisjon AS
- Carbon Centric AS
- Crayon AS Avd. Grålum
- Center-Revisjon Holding AS
- Clever Leather Ungdomsbedrift
- Cgi Norge AS Avd Sarpsborg
- Cornelia Strand Kristiansen
- Carrier Refrigeration Norway AS Avd. Sarpsborg
- Canon Business Center Østfold AS
- Colligo Drift & Utvikling AS
- Caverion Norge AS Avd. Østfold syd (Sarpsborg)