| 2zero GmbH | |
| 3-iQ Werbeagentur | North Rhine-Westphalia |
| 32nd Floor GmbH | |
| 34u GmbH | Saxony |
| 360 Treasury Systems AG | |
| 360games.de | Bavaria |
| 360X AG | |
| 372dpi | Hamburg |
| 3B Pharmaceuticals 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) | |
| 3dTrust | |
| 3E Datentechnik GmbH | Baden-Württemberg |
| 3e Solutions GmbH | |
| 3haende | Berlin |
| 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 |
| 3U Telecom GmbH | |
| 3xEN | Bavaria |
| 3YOURMIND GmbH | |
| 4.screen GmbH | |
| 42 GmbH | Lower Saxony |
| 42DBS GmbH | |
| 42DIGITAL GmbH | Bremen |
| 42robots.com | Bavaria |
| 44u Marketing oHG | Lower Saxony |
| 4D Electronic GmbH | Bavaria |
| 4D Solution | |
| 4ds Consulting | |
| 4fb | North Rhine-Westphalia |
| 4freelance | Bavaria |
| 4freelance Recruitment AG | |
| 4G Systems GmbH & Co. KG | Hamburg |
| 4its GmbH | Hamburg |
| 4SC AG | |