| M-Comp A/S | 8700 | Horsens |
| Manicus Teknik ApS | 4690 | Haslev |
| Maskinfabrikken Automa ApS | 2500 | Valby |
| Max Fodgaard A/S | 2650 | Hvidovre |
| MCH Messecenter Herning A/S | 7400 | Herning |
| MEC A/S | 2750 | Ballerup |
| Mekoprint A/S | 9530 | Støvring |
| Melsen Tech A/S | 9200 | Aalborg SV |
| Metafix A/S | 9560 | Hadsund |
| Metric Industrial A/S | 2765 | Smørum |
| Michael Lundbech A/S | 4100 | Ringsted |
| Micro Technic A-S | 5560 | Aarup |
| Microsolutions A/S | 8700 | Horsens |
| Microturn ApS | 3050 | Humlebæk |
| Mikkelsen Electronics A/S | 3520 | Farum |
| Mim-Plast ApS | 9500 | Hobro |
| Mink-Bürsten ApS | 5492 | Vissenbjerg |
| Mirit Glas A/S | 2730 | Herlev |
| Mobilhouse A/S | 7000 | Fredericia |
| Motron A/S | 8240 | Risskov |
| MTO electric a/s | 7100 | Vejle |
| Murrelektronik ApS | 9000 | Aalborg |
| Møn Print A/S | 4780 | Stege |