| Dectel International GmbH | Baden-Württemberg |
| DeDeNet GmbH | |
| Deep Content GbR | |
| Deep Digital | |
| Deep Electronics GmbH | |
| Deep Neuron Lab GmbH | |
| Deep Safety GmbH | |
| Deep Tech Momentum | |
| DEEP.KBB GmbH | |
| deepc | |
| DeepDrive GmbH | |
| Deepinvent Software GmbH | North Rhine-Westphalia |
| DeepL | |
| Deeploi GmbH | |
| DeepScenario GmbH | |
| Deepset GmbH | |
| DeepSkill GmbH | |
| DeepSpin | |
| Deevio GmbH | |
| Defacto Software GmbH | Bavaria |
| Degetel GmbH | Hesse |
| Degussa Bank AG | Hesse |
| Dehner Elektronik GmbH | Hesse |
| Deichnetz | |
| Deim Electronic Production e.K. | Bavaria |
| Deininger Elektronik GmbH & Co. KG | Baden-Württemberg |
| deinmaster digitale delusionen | Berlin |
| Deinprovider.de | Rhineland-Palatinate |
| Deinzer + Weyland GmbH | |
| Deister Electronic GmbH | Lower Saxony |
| Deitron | Baden-Württemberg |
| DekaBank | Hesse |
| Dekom AG | Hamburg |
| Dekra Digital GmbH | Baden-Württemberg |
| Delco Datentechnik GmbH | North Rhine-Westphalia |
| Delfi Systems GmbH | Baden-Württemberg |
| Delgado Software & Web-Service | Hesse |
| Delicious Data GmbH | |
| Delivery Hero Ventures | |
| delling.net Gesellschaft für innovative Softwareentwicklung mbH | Saarland |
| Delodi UG (haftungsbeschränkt) | |
| DELPHI InformationsMusterManagement GmbH | Brandenburg |
| Delphin Technology AG | North Rhine-Westphalia |
| Delphin Web | Hesse |
| DELTA Computer Products GmbH | Hamburg |
| Delta Engine GmbH | |
| DELTA proveris AG | Saxony |
| Delta Software Technology GmbH | North Rhine-Westphalia |
| Deltastone GmbH | Rhineland-Palatinate |
| DELTEC Automotive GmbH & Co. KG | Bavaria |