| Dipl.-Ing. (FH) Alfred Ruhfaß | Rhineland-Palatinate |
| Dipl.-Ing. (FH) Knut Nickol | Hesse |
| Dipl.-Ing. Bernd Hagebusch VDE, LiTG, LTGR | North Rhine-Westphalia |
| Dipl.-Ing. Jan Freitag Elektronik und Systeme | Hesse |
| Dipl.-Ing. Roy Zarffs IT- Beratung & Dienstleistungen (ZIT) | Hesse |
| Dipl.-Ing. W. Krieger GmbH & Co. KG | Baden-Württemberg |
| Dipl.-Math. Stefan Lesny Software-Entwicklung | Bavaria |
| Dipl.Phys. Peer Stritzinger GmbH | Bavaria |
| Diplom-Ingenieur (FH) Helmut Müller Hard- und Softwaresysteme | Hesse |
| DIPLOMA Hochschule | |
| Diprint GmbH | Rhineland-Palatinate |
| Direct Line Marketing und Kommunikation GmbH | Hamburg |
| Diringer Jakubowski & Co. GmbH | Hamburg |
| Dirk Czech Datasoft | Lower Saxony |
| Dirk Hagedorn | North Rhine-Westphalia |
| Dirk Karsten | Hamburg |
| Dirk Utke | North Rhine-Westphalia |
| DISCHER Automatisierungstechnik GmbH | North Rhine-Westphalia |
| Disco Pharmaceuticals GmbH | |
| Discovergy GmbH | |
| Disegno Werbeagentur GmbH | |
| Display Devices Elektronik AG | Bavaria |
| Display Solution GmbH | Bavaria |
| Disrupt Space UG (haftungsbeschränkt) | Berlin |
| DISS-CO | |
| Distology Ltd | |
| Distribusion Technologies | |
| District Coworking | |
| Distronik GmbH | Bavaria |
| Disy Informationssysteme GmbH | Baden-Württemberg |
| DiTEC Dr. Siegfried Kahlich & Dierk Langer GmbH | Baden-Württemberg |
| ditho internet & media | |
| Ditpro GmbH & Co. KG | Saxony |
| Ditscheri Design & Development | Schleswig-Holstein |
| Dittmann-Digital GmbH | |
| Dittrich & Partner Consulting GmbH | North Rhine-Westphalia |
| DIU MarTech Solutions GmbH | |
| diva-e Digital Value Excellence GmbH | |
| DIVA-Systems | Bremen |
| Dive Solutions GmbH | |
| Divizend GmbH | |
| DK GbR | Lower Saxony |
| DK One Tech | Berlin |
| dkd Internet Service GmbH | Hesse |
| DKN. GmbH & Co. KG | North Rhine-Westphalia |
| DL-Technik GmbH | |
| DLD Diagnostika GmbH | |
| Dlubal Software GmbH | Baden-Württemberg |
| DM Solutions e.K. | Hesse |
| DMC Direct-Marketing-Consulting GmbH | |