| Telono S.A. | Geneva |
| Teltronic AG | Solothurn |
| Temenos Headquarters S.A. | Geneva |
| ten23 health AG | |
| Tenity Group AG | |
| Tenthpin Management Consultants AG | |
| TeQatlas GmbH | |
| Terapet S.A. | |
| Terminal42 GmbH | Bern |
| Terra Quantum AG | |
| Terralayr | |
| Teseq AG | Basel-Landschaft |
| TestingTime AG | |
| Tesweb S.A. | Neuchâtel |
| Tetrasoft GmbH | Aargau |
| Teylor AG | |
| TGIM | |
| THE Port Association | Geneva |
| The Swiss Digital AG | |
| The Toolpark Corporation AG | Zurich |
| TheNet-Internet Services AG | Bern |
| THEOS | |
| Threatray AG | |
| Threema | |
| thuinformatik GmbH | Zurich |
| Thurgauer Kantonalbank | |
| ti&m AG | |
| Ticos Engineering AG | Zurich |
| TieTalent S.A. | |
| Tillotts Pharma AG | |
| Tinamu Labs AG | |
| Tindeco Financial Services AG | |
| Tinext | Ticino |
| Tioms GmbH | Bern |
| TNC Consulting AG | Zurich |
| tnt-graphics AG | Zurich |
| Tocco AG | Zurich |
| TOFWERK AG | |
| Token Flow Insights S.A. | |
| Token2 S.a.r.l. | |
| Tolremo Therapeutics AG | |
| Tomahawk.VC | |
| Tomas Houska | Thurgau |
| Top-Domains | Valais |
| Top-Host.ch | Thurgau |
| Topadur Pharma AG | |
| Topal Solutions AG | Zurich |
| topCare Management AG | Zurich |
| Topomat Technologies S.A. | Vaud |
| Topsoft | Lucerne |