| Traxpay GmbH | |
| Treamid Therapeutics GmbH | |
| TreasureHunter | |
| Treasury Intelligence Solutions GmbH | |
| TreasuryView | |
| Tredict | |
| tredition GmbH | |
| Treepoint AG | Hesse |
| Treesoft GmbH & Co. KG | North Rhine-Westphalia |
| Treitz Weyer Braun Garth Prinz GbR | Berlin |
| Tremonia Mobility GmbH | |
| Trend Point Marketing GmbH | |
| Trendomedia GmbH | |
| Trendware Service e.K. | |
| trenta [3] media design | Lower Saxony |
| Trenz Electronic GmbH | North Rhine-Westphalia |
| Trenzyme GmbH | |
| Tresor Software GmbH | North Rhine-Westphalia |
| Triangle Holding UG | Hesse |
| Tribus IT GmbH & Co. KG | North Rhine-Westphalia |
| TRiCares GmbH | |
| TriCAT GmbH | |
| Tricept Informationssyteme AG | North Rhine-Westphalia |
| TriDiCam GmbH | |
| TriDiS Multimedia GmbH | North Rhine-Westphalia |
| Triemax Software | Saarland |
| Triestram und Partner AG | North Rhine-Westphalia |
| TRIGA Consulting GmbH & Co. KG | |
| TRIGA-S GmbH | |
| Trigis Vermessung & Geoinformatik GmbH | Thuringia |
| TRIGON Business Intelligence GmbH & Co. KG | North Rhine-Westphalia |
| Trigon Elektronik GmbH | Hesse |
| Trilobit GmbH | Baden-Württemberg |
| Trimaco Software GmbH | Baden-Württemberg |
| Trimask Design | Baden-Württemberg |
| Trimeta software GmbH | Baden-Württemberg |
| TRIMT GmbH | |
| TrioBitInformationssysteme GmbH | North Rhine-Westphalia |
| trion digital GmbH | Bavaria |
| TRION Research GmbH | |
| Trioptics GmbH | Schleswig-Holstein |
| Triple A Consulting GmbH & Co. KG | Hesse |
| triple-i new media system design GmbH | Hesse |
| TripleCheck | Hesse |
| TripleCheck GmbH | |
| Triplesense Reply GmbH | |
| Tripodo GmbH | |
| Trips GmbH | North Rhine-Westphalia |
| Tripuls Media Innovations GmbH | North Rhine-Westphalia |
| TriRhena Consulting e.V. | |