| Navn | Postnummer | By |
|---|---|---|
| Carl J Nielsen A/S | 8930 | Randers NØ |
| Carlo Gavazzi Handel A/S | 8370 | Hadsten |
| Carsten Holm A/S | 5750 | Ringe |
| Cleansafe A/S | 5260 | Odense S |
| Columbus A/S | 2750 | Ballerup |
| Combitherm A/S | 8653 | Them |
| ComSystem A/S | 3490 | Kvistgård |
| Condair A/S | 8680 | Ry |
| Contika ApS | 8382 | Hinnerup |
| Copenhagen Pump | 2650 | Hvidovre |