| Mentor IT | Region of Southern Denmark |
| Mercantec | |
| MergeIT | |
| Merkur Andelskasse | |
| Merlinia A/S | Capital Region of Denmark |
| Mermaid Consulting ApS | North Jutland Region |
| MethylDetect ApS | |
| Michael Rurup Andersen | Capital Region of Denmark |
| Micro-Sys ApS | |
| Micropartner A/S | |
| MicroShade A/S | |
| Microsoft Denmark | Capital Region of Denmark |
| Microsys | Central Denmark Region |
| MicroTech Software A/S | |
| Middelfart Sparekasse | |
| Mifon | Central Denmark Region |
| Miinto Group | Capital Region of Denmark |
| Milcom | Capital Region of Denmark |
| Milestone Systems A/S | |
| Miljø- og Ligestillingsministeriet | |
| Minerva Group A/S | Central Denmark Region |
| MinervaX ApS | |
| Mingler | Capital Region of Denmark |
| MipSalus ApS | |
| Mjolner informatics | |
| MM Vision | Region Zealand |
| MM-Graphics | Region Zealand |
| Mobil.nu | Capital Region of Denmark |
| Mobile Industrial Robots ApS | Region of Southern Denmark |
| MobilePay | |
| MobilePeople | |
| Mobilsiden.dk | Capital Region of Denmark |
| Mobitech Telecom | Capital Region of Denmark |
| MOCH A/S | Capital Region of Denmark |
| MochaSoft | |
| MochaSoft ApS | North Jutland Region |
| Modbus Tools | Central Denmark Region |
| Modified Solutions ApS | Central Denmark Region |
| Modify.dk | Region Zealand |
| modl.ai | |
| Molecular Quantum Solutions ApS | |
| MOLSLINJEN A/S | |
| momondo.pro | Capital Region of Denmark |
| MonkDigital | |
| Monopulse | |
| Monsenso A/S | |
| Monta | Capital Region of Denmark |
| Monta ApS | |
| MonTa Biosciences ApS | |
| Montes A/S | North Jutland Region |