| LNI GmbH | Bavaria |
| LobbySpace GmbH | |
| LOBO Electronic GmbH | Baden-Württemberg |
| Lobstersoft | Hesse |
| Locafox GmbH | Berlin |
| local101 | |
| Localyze | |
| LocaNet GmbH | Hesse |
| Locatech IT Solutions GmbH | North Rhine-Westphalia |
| Loch Leiterplatten GmbH | Berlin |
| Lochmann Apps | |
| Locoia GmbH | |
| LODATA Micro Computer GmbH | |
| Lodgit Hotelsoftware GmbH | Saxony |
| Loeser IT GmbH | |
| Loetronic | North Rhine-Westphalia |
| Logata Digital Solutions GmbH | North Rhine-Westphalia |
| LogiBall GmbH | North Rhine-Westphalia |
| Logic Instrument | Hesse |
| Logic Joe GmbH | |
| Logic Way GmbH | North Rhine-Westphalia |
| Logical Line GmbH | Lower Saxony |
| Logicline GmbH | Baden-Württemberg |
| Logics Software GmbH | Bavaria |
| Logics Systems GmbH | Bavaria |
| LOGIC_NET Gesellschaft für Computerschulungen GmbH | |
| LogiDataTech Electronic GmbH | Baden-Württemberg |
| LogiM GmbH | Berlin |
| Login & Solutions AG | Bavaria |
| LOGIN SystemHaus GmbH | Hesse |
| LogiPlus Consulting GmbH | Rhineland-Palatinate |
| LOGISO Logistik-Systeme GmbH | North Rhine-Westphalia |
| LogiSoft GmbH & Co. KG | Hesse |
| Logistica OS GmbH | |
| Logistik Konzepte Software GmbH | Bavaria |
| Logiware GmbH | Lower Saxony |
| Logiway GmbH | Berlin |
| LOGO Datensysteme GmbH | Bremen |
| Logocom International AG | Rhineland-Palatinate |
| Logotel IT-Systeme | Bavaria |
| Logtek GmbH | Bavaria |
| LohnDialog Abrechnungs GmbH | Berlin |
| Lohnexperte AG | Saxony-Anhalt |
| LOHRFINK Software Engineering GmbH & Co. KG | Baden-Württemberg |
| Lohse - IT & Media Consulting | |
| LOK | North Rhine-Westphalia |
| Look Werbeagentur GmbH | Lower Saxony |
| Loopline Systems GmbH | |
| Loovent UG (haftungsbeschränkt) | Hamburg |
| Lorch Webdesign | |