| NFEA | 4623 | Kristiansand |
| Nippon Gases Norge AS | 0915 | Oslo |
| Noble Installation AS | 1894 | RAKKESTAD |
| Norclean AS | 6419 | MOLDE |
| Nord Gear Norge AS | 5105 | Eidsvåg i Åsane |
| Nord-Lock AS | 3510 | Hønefoss |
| Nordiske Fagmedier AS | 0412 | Oslo |
| Nordiske Innholdsmarkedsføring | 9220 | Aalborg Ø |
| norelem AB | 193 91 | Sigtuna |
| Norse Cutting | 4050 | Sola |
| Norsecraft Tec AS | 1339 | Vøyenenga |
| Norsk Overflate Teknikk AS | 4365 | NÆRBØ |
| Norsk Stål AS | 1378 | Nesbru |
| Norsk Stålforbund | 0179 | Oslo |
| Norske Backer AS | 2212 | Kongsvinger |
| Not Industrimaling AS | 4365 | NÆRBØ |
| Not Overflatebehandling AS | 4344 | Bryne |
| Not Prosess AS | 4340 | BRYNE |
| NOT Pulverlakk AS | 4323 | SANDNES |
| Not Varmforzinking AS | 4365 | NÆRBØ |
| NTT AS | 3830 | ULEFOSS |
| Nøsted & As avd. Kragerø | 3766 | SANNIDAL |