| Manomatic A/S | 8800 | Viborg |
| Marktlink Mergers & Acquisitions ApS | 2900 | Hellerup |
| Maskinsikkerhed ApS | 3500 | Værløse |
| Masytec A/S | 2605 | Brøndby |
| Matilda FoodTech Danmark | 2300 | København S |
| Mc Uldall Maskinfabrik ApS | 8660 | Skanderborg |
| MENY Kaffe | 9400 | Nørresundby |
| Mespo ApS | 4180 | Sorø |
| Mettler-Toledo A/S | 2600 | Glostrup |
| Microsolutions A/S | 8700 | Horsens |
| Midtjydsk Kran & Elektro a/s | 7400 | Herning |
| Midtjysk Rustfri ApS | 8620 | Kjellerup |
| Mikkelsen Electronics A/S | 3520 | Farum |
| Mink-Bürsten ApS | 5492 | Vissenbjerg |
| Mirit Glas A/S | 2730 | Herlev |
| MOCON Europe A/S (Dansensor) | 4100 | Ringsted |
| MODU Valves A/S | 7100 | Vejle |
| mt spray a/s | 2730 | Herlev |
| Multi Køl & Energi A/S | 8220 | Brabrand |
| Multi-Services ApS | 7000 | Fredericia |
| Multivac A/S | 7100 | Vejle |
| Munters A/S | 3520 | Farum |
| Murrelektronik ApS | 9000 | Aalborg |