| ICAT Norden | 7120 | Vejle Øst |
| IFM Electronic A/S | 2605 | Brøndby |
| IHFood A/S | 2200 | København N |
| Induflex A/S | 9530 | Støvring |
| influx a/s | 5492 | Vissenbjerg |
| Ingemann Maskinfabrik A/S | 4000 | Roskilde |
| IngenCO2.dk | 8000 | Århus N |
| Ingerslev Maskinfabrik A/S | 8361 | Hasselager |
| Ingvald Christensen A/S Maskinfabrik | 5260 | Odense S |
| INOX Stål Handelsselskab A/S | 8680 | Ry |
| Intec A/S / Weimar Nicolaisen A/S | 6000 | Kolding |
| Interroll Nordic A/S | 2650 | Hvidovre |
| Intertek Dic A/S | 6000 | Kolding |
| IPW Systems A/S | 6000 | Kolding |
| ISS Facility Service A/S | 2860 | Søborg |
| Iwaki Nordic A/S | 3400 | Hillerød |
| integra2r ApS | 8310 | Tranbjerg J |