| MPC-Software GmbH | North Rhine-Westphalia |
| mpression Media | Stephan Tunn e.K. | North Rhine-Westphalia |
| MPS Public Solutions GmbH | Rhineland-Palatinate |
| MPSI Technologies GmbH | |
| MPstudios Steffen Männle & Martin Poschenrieder GbR | Baden-Württemberg |
| mpunkt GmbH | |
| MR Automation GmbH | Bavaria |
| MR Elektronik GmbH & Co. KG | Hesse |
| MrFischer Web-Development | |
| MRH applications GmbH | |
| MRZ Service GmbH & Co. KG | North Rhine-Westphalia |
| MS Computer GmbH | Baden-Württemberg |
| MS Elektronik GmbH | Bavaria |
| ms microtech Gesellschaft für Informationsverarbeitung und technischen Service mbH | |
| MS POS GmbH | Baden-Württemberg |
| MS SPACELAB Accelerator | |
| MS-Schramberg GmbH & Co. KG | |
| MS-Software GmbH | North Rhine-Westphalia |
| MSB Medical School Berlin GmbH | |
| MSC Computer Vertriebs-Gesellschaft mbH | North Rhine-Westphalia |
| MSC Mobile GmbH | Bavaria |
| MSC Technologies GmbH | Baden-Württemberg |
| mscom IT-Systems GmbH | Hamburg |
| MSE Camsoft GmbH | Baden-Württemberg |
| MSE Middleware Software Engineering GmbH | Schleswig-Holstein |
| MSG Lithoglas GmbH | |
| msg technologies GmbH | Bavaria |
| MSH AND MORE Werbeagentur GmbH | |
| MSI Software GmbH | Hesse |
| MSI Solutions GmbH | Bavaria |
| MSM.digital | |
| mso digital GmbH & Co. KG | |
| MSP Kopiersysteme GmbH | Thuringia |
| MSP Medien Systempartner GmbH & Co. KG | |
| msu solutions GmbH | |
| msuBerlin GmbH | Berlin |
| MSW GmbH & Co. KG | |
| MSW Innovative Software GmbH | Baden-Württemberg |
| MT Aerospace AG | |
| MTI Teleport München GmbH | |
| MTUG Munich TYPO3 Usergroup | Bavaria |
| muc IT systems | |
| much. GmbH | |
| MüCom Systeme GmbH | Thuringia |
| Muehr.Net | Bavaria |
| mufin GmbH | Berlin |
| Mukocell GmbH | |
| Mula GmbH | |
| Müller IT | Baden-Württemberg |
| MÜLLER UND STEIN software | Baden-Württemberg |