| Transloadit-II GmbH | |
| Translumina GmbH | |
| Transporeon GmbH | |
| Transporter Lab GmbH | |
| TransWare AG | Rhineland-Palatinate |
| TrashMail.com | Baden-Württemberg |
| Travian Games GmbH | Bavaria |
| Travis CI | |
| Travis CI GmbH | Berlin |
| Traxpay GmbH | |
| Treamid Therapeutics GmbH | |
| TreasureHunter | |
| Treasury Intelligence Solutions GmbH | Baden-Württemberg |
| Treasury Intelligence Solutions GmbH | |
| TreasuryView | |
| Tredict | |
| tredition GmbH | North Rhine-Westphalia |
| tredition GmbH | |
| Treepoint AG | Hesse |
| Treesoft GmbH & Co. KG | North Rhine-Westphalia |
| Treitz Weyer Braun Garth Prinz GbR | Berlin |
| 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 |
| TriCAT GmbH | |
| Tricept Informationssyteme AG | North Rhine-Westphalia |
| Trickle | |
| TriDiCam GmbH | |
| TriDiS Multimedia GmbH | North Rhine-Westphalia |
| Triemax Software | Saarland |
| Triestram und Partner AG | North Rhine-Westphalia |
| TRIGA Consulting GmbH & Co. KG | |
| 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 |
| TrioBitInformationssysteme GmbH | North Rhine-Westphalia |
| trion digital GmbH | Bavaria |
| TRION Research GmbH | |
| Trioptics GmbH | Schleswig-Holstein |
| Triple A Consulting GmbH & Co. KG | Hesse |