| Navn | Postnummer | By |
|---|---|---|
| Marine Power ApS | 4873 | Væggerløse |
| Marineshaft A/S | 9850 | Hirtshals |
| Marpro ApS | 3000 | Helsingør |
| Marstal Navigationsskole | 5960 | Marstal |
| MARTEC | 9900 | Frederikshavn |
| Martec Skagen | 9990 | Skagen |
| Masytec A/S | 2605 | Brøndby |
| ME Production A/S | 9900 | Frederikshavn |
| Megatrade | 2650 | Hvidovre |
| MENY Kaffe | 9400 | Nørresundby |
| Mirit Glas A/S | 2730 | Herlev |
| MODU Valves A/S | 7100 | Vejle |
| MOL Chemical Tankers Europe A/S | 2900 | Hellerup |