| Chaos Software EOOD | |
| Chargecloud GmbH | |
| ChargeX GmbH | |
| Charging Interface Initiative (CharIN) e. V. | |
| Charité - Universitätsmedizin Berlin | Berlin |
| Charles GmbH | |
| Charly Education | |
| ChartMogul GmbH & Co. KG | |
| Chatbot Summit | |
| ChatPDF GmbH | |
| Chatsystem24.de | Schleswig-Holstein |
| CHC IT-Solutions | SOLVA | Hesse |
| CHD Electronics GmbH | Schleswig-Holstein |
| CHECK24 Ventures GmbH | |
| CHECK5 | Baden-Württemberg |
| Checkdomain GmbH | |
| Checkmk | Bavaria |
| Checkwise App | |
| chem IT Services GbR | Bavaria |
| ChemCon GmbH | |
| Chemisch-pharmazeutisches Labor, Rolf Sachse GmbH | |
| Chemovator GmbH | |
| Cherry Ventures | Berlin |
| Cherry Ventures Management GmbH | |
| Ches IT Service GmbH | Hesse |
| Chiemgau Control UG | |
| Chilinet Solutions GmbH | |
| Chimera Biotec GmbH | |
| CHIP Xonio Online GmbH | Bavaria |
| CHIP-FLIP | Bavaria |
| Chipcon Systems GmbH | Bavaria |
| Chirai GbR | Bavaria |
| Chives | Hesse |
| CHM.Digital GmbH | |
| Choco Communications GmbH | |
| Chris Heilmann | Berlin |
| Christa Siebes und Lorenz Hölscher Software-Service GbR | North Rhine-Westphalia |
| Christian Adolphy Consulting | Hesse |
| Christian Beier | Brandenburg |
| Christian Borchardt Informatik | North Rhine-Westphalia |
| Christian Ehrhart | North Rhine-Westphalia |
| Christian Jäger Webdesign | Baden-Württemberg |
| Christian Koenen GmbH | |
| Christian Schmidt - Computerservice | Rhineland-Palatinate |
| Christian Schmitz Software GmbH | Rhineland-Palatinate |
| Christian-Albrechts-Universität zu Kiel | Schleswig-Holstein |
| Christian-Albrechts-Universität zu Kiel - Institut für Informatik | Schleswig-Holstein |
| Christian-Albrechts-Universität zu Kiel - Mathematisches Seminar | Schleswig-Holstein |
| Christian-Albrechts-University of Kiel - Information and Coding Theory Lab | Schleswig-Holstein |
| Christliche Internet Dienst GmbH | Berlin |