| Synthesis AG | Zurich |
| SysCo Systèmes de Communication S.A. | Neuchâtel |
| SyselCloud | Vaud |
| SYSTEL Solutions GmbH | Bern |
| System-Clinch Aadorf GmbH | Zurich |
| System-Clinch Internet Services GmbH | Zurich |
| Systemworx GmbH | Bern |
| T3 Pharmaceuticals AG | |
| Tajloro GmbH | Glarus |
| Talenthouse AG | |
| Talentory AG | |
| Tangarena Engineering AG | Lucerne |
| Tangem AG | |
| TargImmune Therapeutics AG | |
| Tariff Eye | Vaud |
| TAS S.p.A. | Ticino |
| Taskbase AG | |
| Taurus S.A. | |
| TBM Automation AG | St. Gallen |
| TCC Telecom-Center AG | Aargau |
| TcNet GmbH | Bern |
| TE Connectivity | |
| Teambox AG | Zurich |
| Tecadvice | Vaud |
| Tecan Trading AG | |
| Tech Data (Schweiz) GmbH | Zug |
| Tech4eva | |
| TECH5 | Geneva |
| TecHelP IT Services | Geneva |
| Technis S.A. | |
| Technis S.A. | |
| Technologies Improving the World | |
| Technology Staffing Group S.A. | Geneva |
| Technopark | Zurich |
| Technowave Informatique | Jura |
| Techwan | Vaud |
| Tecnet mediadesign | Bern |
| Tecuro Holding AG | |
| TecWare GmbH | Lucerne |
| Tegonal GmbH | Bern |
| TEKO Schweizerische Fachschule AG | |
| Telabo AG | Zug |
| Telcom Cablenet AG | Lucerne |
| Telefon- und Büroservice Catherine Schmid | Zurich |
| Teleport Media | |
| Télésonique S.A. | Zurich |
| Teletrend AG | Zug |
| Teletronik AG | Zug |
| Television Aegeri AG | Zug |
| Tellco Banque S.A. | |