| Coderesearch GmbH & Co. KG | Thuringia |
| Codesco IT Consulting GmbH | Schleswig-Holstein |
| CodeSnap | |
| Codestep GmbH | |
| codestryke GmbH | |
| CodeSubmit | |
| Codewerk GmbH | |
| CodeWrights | |
| CODE_N | Baden-Württemberg |
| Codia Software GmbH | Lower Saxony |
| Codicon GmbH | Thuringia |
| CODIe Software Products e.K. | Brandenburg |
| Codingpeople GmbH | Baden-Württemberg |
| Codio Impact GmbH | |
| Coeno Consult GmbH & Co. KG | Hesse |
| Cofenster GmbH | |
| Coffee GmbH | Hesse |
| Coftech GmbH | North Rhine-Westphalia |
| Cogito Gesellschaft für Informations- und Lernsysteme mbH | Rhineland-Palatinate |
| COGITO Retail GmbH & Co. KG | Rhineland-Palatinate |
| Cogneus Design | Hesse |
| Cognigy | |
| Cognitec Systems GmbH | Saxony |
| Cohrs+Partner Automatisierungs GmbH | Lower Saxony |
| COI Consulting für Office und Information Management GmbH | Bavaria |
| Coin Com IT & TK - Systemtechnik Junge | Baden-Württemberg |
| Coin Consulting GmbH | |
| Coin.ink | |
| Coindex GmbH | |
| CoinTracking | |
| cojama Infosystems GmbH | Hesse |
| Cokuna Communication | Saxony |
| ColdFire Games | |
| Colenet GmbH | |
| Collax GmbH | Bavaria |
| collectAI GmbH | |
| Collmex GmbH | Saarland |
| Collogia AG | North Rhine-Westphalia |
| Cologne Chip AG | North Rhine-Westphalia |
| Cologne Game Lab | North Rhine-Westphalia |
| Cologne Hosting | |
| Cologne Intelligence | |
| Cologne Startup Ecosystem | North Rhine-Westphalia |
| Cologne.io | North Rhine-Westphalia |
| CologneInvest GmbH | North Rhine-Westphalia |
| Columbus Holding AG | Baden-Württemberg |
| Columbus Interactive GmbH | Baden-Württemberg |
| Columbus Leasing GmbH | Baden-Württemberg |
| ColVisTec AG | |
| COM CAD Burghardt GmbH | Bavaria |