| MEGWARE Computer GmbH | Saxony |
| MEHRKANAL GmbH | North Rhine-Westphalia |
| Meilhaus Electronic GmbH | Bavaria |
| Mein-Office Webdesign | Hesse |
| Meinberg Funkuhren GmbH & Co. KG | Lower Saxony |
| MEINBERG RADIO CLOCKS GmbH & Co. KG | Lower Saxony |
| meinbüro | |
| MeinTrendyHandy GmbH | |
| Meissner Consulting GmbH | Bavaria |
| meissner.IT GmbH | North Rhine-Westphalia |
| MeisterLabs Software GmbH | |
| Meisterwek App GmbH | |
| Melatronik GmbH | Bavaria |
| melon|media UG (haftungsbeschränkt) | Hamburg |
| Melos GmbH | Bavaria |
| Melos Software Entwicklung + EDV-Systeme GmbH | Baden-Württemberg |
| MeMail AG | |
| Memorysolution GmbH | |
| Memotech GmbH | North Rhine-Westphalia |
| Memphis Electronic AG | Hesse |
| Men at Work GmbH | Baden-Württemberg |
| Menlo Systems GmbH | Bavaria |
| Mensch und Maschine | Bavaria |
| Mentessa GmbH | |
| Mentronic | Berlin |
| Mephisto-PC GmbH | Hesse |
| Mera-soft gmbh | Baden-Württemberg |
| Merabit Meßinger & Rantzuch GbR | Saxony |
| Merantix AG | Berlin |
| Merantix Capital | |
| Merantix Momentum GmbH | |
| Mercanis | |
| Mercator | Hamburg |
| Mercedes-Benz AG | |
| Mercedes-Benz Consulting GmbH | |
| Merces GmbH | Saxony |
| Mercoline GmbH | Berlin |
| Merconics GmbH & Co. KG | |
| Mercury.ai GmbH | |
| MERIDIAN Softwaresysteme für Medien GmbH | |
| Merkl IT GmbH | |
| merkle.eu Webservice | Baden-Württemberg |
| Merlin GmbH | North Rhine-Westphalia |
| MerLion Pharmaceuticals GmbH | |
| Merlitron Engineering | Berlin |
| Mersys Campus | |
| Mervisoft GmbH | Hesse |
| Merz Akademie gemeinnützige GmbH | |
| Merz Therapeutics GmbH | |
| MES Electronic Connect GmbH & Co. KG | Baden-Württemberg |