| Mach-Tech A/S | 8600 | Silkeborg |
| Madera aps | 7361 | Ejstrupholm |
| Manomatic A/S | 8800 | Viborg |
| Mariendal | 9000 | Aalborg |
| Marktlink Mergers & Acquisitions ApS | 2900 | Hellerup |
| Masentia A/S | 5250 | Odense SV |
| Maskinfabrikken Automa ApS | 2500 | Valby |
| Maskinfabrikken Esko A/S | 9530 | Støvring |
| Maskinfabrikken Silkeborg Spåntagning A/S | 8600 | Silkeborg |
| Maskinsikkerhed ApS | 3500 | Værløse |
| Masterroll A/S | 8362 | Hørning |
| Masytec A/S | 2605 | Brøndby |
| Mawi Stål og Rustfri ApS | 8340 | Malling |
| Max Fodgaard A/S | 2650 | Hvidovre |
| Mc Uldall Maskinfabrik ApS | 8660 | Skanderborg |
| Mega-Therm ApS | 4683 | Rønnede |
| Megatrade | 2650 | Hvidovre |
| Mekanic A/S | 9690 | Fjerritslev |
| Mekoprint A/S | 9530 | Støvring |
| Mekoprint Seritronic A/S | 9530 | Støvring |
| Meldgaard Electric A/S | 8700 | Horsens |
| Melsen Tech A/S | 9200 | Aalborg SV |
| MENY Kaffe | 9400 | Nørresundby |
| Mespo ApS | 4180 | Sorø |
| Metacoat A/S | 3230 | Græsted |
| Metal Work Danmark A/S | 2670 | Greve |
| Metalcolour A/S | 4800 | Nykøbing F |
| METALMASKINER A/S | 8700 | Horsens |
| Metalservice Nordic A/S | 8700 | Horsens |
| Michael Lundbech A/S | 4100 | Ringsted |
| Micro Technic A-S | 5560 | Aarup |
| Microsolutions A/S | 8700 | Horsens |
| Microturn A/S | 3050 | Humlebæk |
| Midtjydsk Fornikling og Forchromning A/S | 7400 | Herning |
| Midtjydsk Kran & Elektro a/s | 7400 | Herning |
| Midtsjællands Maskinværksted | 4420 | Regstrup |
| Migatronic A/S | 9690 | Fjerritslev |
| Migatronic Automation A/S | 9440 | Aabybro |
| MIKA Tool | 8930 | Randers NØ |
| Mikkelsen Electronics A/S | 3520 | Farum |
| MillPart A/S | 6900 | Skjern |
| Mink-Bürsten ApS | 5492 | Vissenbjerg |
| Mirit Glas A/S | 2730 | Herlev |
| Mitsubishi Forklift Trucks - Logisnext Denmark A/S | 2670 | Greve |
| ML Industries A/S | 9881 | Bindslev |
| MODU Valves A/S | 7100 | Vejle |
| Moldow A/S | 6670 | Holsted |
| Mouritsen A/S | 7100 | Vejle |
| MTO electric a/s | 7100 | Vejle |
| MTS Randers A/S | 8940 | Randers SV |
| Multicut A/S | 7480 | Vildbjerg |
| Munk Technologies | 5560 | Aarup |
| Munters A/S | 3520 | Farum |
| Murrelektronik ApS | 9000 | Aalborg |
| Møllers Værktøjsfremstilling | 7700 | Thisted |