| th data GmbH | Berlin |
| TH Electronic GmbH | Thuringia |
| TH Köln | North Rhine-Westphalia |
| th-net | |
| Thamm IT GmbH | Lower Saxony |
| ThatsMobile GmbH | |
| THAVIS GmbH & Co. KG | North Rhine-Westphalia |
| Thax Software GmbH | Berlin |
| Thaysen Telecom GmbH & Co. KG | Schleswig-Holstein |
| THBI.de | Bavaria |
| The Beast GmbH | |
| The Climate Choice UG (haftungsbeschränkt) | |
| The Cloud Networks Germany GmbH | Bavaria |
| The Document Foundation | Hesse |
| The Exploration Company | |
| The Game of Robot | Baden-Württemberg |
| the IT company GmbH | North Rhine-Westphalia |
| The Jodel Venture GmbH | |
| The Land of Fey GmbH | |
| The Marketing Company GmbH & Co. KG | Hesse |
| The Media Company e.K. | Bavaria |
| The Mobility House GmbH | |
| The Project Group Informationstechnologie GmbH | Bavaria |
| The Reach Group GmbH | Berlin |
| The Stepstone Group GmbH | |
| The Virtual Solution GmbH | Bavaria |
| The-Software-Experts | Bavaria |
| TheBlue.ai GmbH | |
| THEED Technology GmbH | |
| Theis Consult GmbH | North Rhine-Westphalia |
| THEO | |
| Theobald Software GmbH | Baden-Württemberg |
| Thera Bytes GmbH | |
| TheraBionic GmbH | |
| TheraBionic GmbH | |
| TheraGenesis GmbH | |
| Therawis Pharma GmbH | |
| Thermondo GmbH | |
| Thermosome GmbH | |
| Thermosphr | |
| Theseus Digital | Hamburg |
| Thesycon | Thuringia |
| Theum AG | Baden-Württemberg |
| theurer.com GmbH | Baden-Württemberg |
| Thielbeer – Agentur für Werbung & Marketing | North Rhine-Westphalia |
| Thielenhaus & Partner Agentur für Marketing GmbH | North Rhine-Westphalia |
| Thieme Compliance GmbH | Bavaria |
| Thierhoff Consulting | |
| Thiesen Hardware- und Software-Design GmbH | Hesse |
| thinformatics AG | |