| 2pi IT Solutions GmbH | |
| 2PLUSagentur GmbH | |
| 2raumwelten | Berlin |
| 2Sync GmbH | |
| 2T Design | North Rhine-Westphalia |
| 2team new media GmbH | Bavaria |
| 2txt GmbH | |
| 2W-Design Internetagentur | North Rhine-Westphalia |
| 2wcom Systems GmbH | |
| 2Werken Werbeagentur | North Rhine-Westphalia |
| 2zero GmbH | |
| 3-iQ Werbeagentur | North Rhine-Westphalia |
| 300Microns GmbH | |
| 32nd Floor GmbH | |
| 34u GmbH | Saxony |
| 35up GmbH | |
| 360 Consulting GmbH | |
| 360 Treasury Systems AG | |
| 360games.de | Bavaria |
| 360X AG | |
| 372dpi | Hamburg |
| 3B Pharmaceuticals GmbH | |
| 3D Interaction Technologies GmbH | |
| 3D RealityMaps GmbH | Bavaria |
| 3D Spark GmbH | |
| 3D-IO Games & Video Production GmbH | Hesse |
| 3D-Micromac AG | |
| 3Dconnexion GmbH | Bavaria |
| 3DFascination | |
| 3dgamestudio | Hesse |
| 3DOne Software Vertriebs GmbH | Bavaria |
| 3Dreams Medienagentur Augustin Huber GbR | Bavaria |
| 3DT UG (haftungsbeschränkt) | Berlin |
| 3dTrust | |
| 3E Datentechnik GmbH | Baden-Württemberg |
| 3e Solutions GmbH | |
| 3haende | Berlin |
| 3icad Software Solutions UG hb | |
| 3IVIS GmbH | |
| 3KV GmbH | Bavaria |
| 3pc GmbH | Berlin |
| 3Points Software GmbH | Bavaria |
| 3Q GmbH | |
| 3S GmbH | North Rhine-Westphalia |
| 3T Software Labs Ltd | |
| 3Task – Frank Stemmler | Rhineland-Palatinate |
| 3U HOLDING AG | Hesse |
| 3wfuture.de | |
| 3xEN | Bavaria |
| 3YOURMIND GmbH | |