| Thing Technologies GmbH | |
| thingk.systems UG (haftungsbeschränkt) | |
| Think Different GmbH | Berlin |
| think-cell Software GmbH | Berlin |
| Think.iT | |
| THINK5 GmbH | North Rhine-Westphalia |
| Thinkbox Berlin GmbH | |
| Thinking Objects GmbH | Baden-Württemberg |
| Thinkport GmbH | Hesse |
| Thinkprint GmbH | |
| Thinkprogressive | |
| Thinkproject Holding GmbH | Bavaria |
| Thinksurance GmbH | |
| Thinktecture AG | Baden-Württemberg |
| ThinPrint GmbH | Berlin |
| THIS IS! Digital Media Group GmbH | Lower Saxony |
| Thiscode e.K. | North Rhine-Westphalia |
| Thomas & Gilles GmbH | North Rhine-Westphalia |
| Thomas Böhme EDV | Baden-Württemberg |
| Thomas Frütel | North Rhine-Westphalia |
| Thomas Hippchen GmbH | Saarland |
| Thomas Oltzen | North Rhine-Westphalia |
| Thomas Pelletier Web- und Printdesign | Saarland |
| Thomas Schoessow | Rhineland-Palatinate |
| Thomas Schütt | Hamburg |
| Thomas schwobe softwareentwicklung | Thuringia |
| Thomas Wollner | Hesse |
| Thomas-Krenn.AG | Bavaria |
| THOMSEN Elektronik GmbH | Hesse |
| THORANET Unternehmensberatung für Netzwerk- und Systemmanagement GmbH | Hesse |
| Thorsis Technologies GmbH | Saxony-Anhalt |
| Thorsten Ebert IT Beratung GmbH | |
| Thorsten Ochs Softwareentwicklung | Baden-Württemberg |
| Thorsten Rinne | Bavaria |
| Thorsten Turck | Lower Saxony |
| THOST Projektmanagement GmbH | |
| Thought of You GmbH | |
| Thoxan GmbH | North Rhine-Westphalia |
| ThreeB IT | |
| Threedy GmbH | |
| THS-Software GmbH | Baden-Württemberg |
| Thüringer Linux User Group | Thuringia |
| Thyssenkrupp Aerospace Germany GmbH | |
| Thyssenkrupp AG | |
| thyssenkrupp Materials DataflowWorks GmbH | |
| tiakis Biotech AG | |
| TIASmedia | Saxony |
| TIB Molbiol Syntheselabor GmbH | |
| Tiba Managementberatung GmbH | |
| ticket i/O GmbH | |