| Topomat Technologies S.A. | Vaud |
| Topsoft | Lucerne |
| TopWeb | |
| Toran Proxy | |
| Torqur AG | |
| Toshiba Tec Switzerland AG | Zurich |
| Totemo AG | Zurich |
| Toucan Protocol | |
| Touchless Biometric Systems AG | Zurich |
| Tradeplus24 AG | |
| Trading-Tools.com | |
| TRAMsoft GmbH | Zurich |
| Translation-X | |
| Transmission Solutions GmbH | Zurich |
| Transparens AG | Zurich |
| Transpo Data AG | Solothurn |
| Transtec Computer AG | Zurich |
| trash.net | Zurich |
| TRB Chemedica International S.A. | |
| TREA Ventures GmbH | |
| TreaTech | |
| TrekkSoft | |
| Trenderia GmbH | Bern |
| Trendhosting | Bern |
| trendpoint GmbH | Zug |
| Tresorit AG | Zurich |
| Trident Software S.à.r.l. | |
| TRIENERGY Schweiz AG | Basel-Landschaft |
| Trigonella GmbH | Basel-Stadt |
| Trina Bioreactives AG | |
| Tritec AG | Bern |
| Truesoft AG | Zug |
| Trustless.ai | |
| Tucom Computer | Bern |
| Tugboat | |
| Tune Insight S.A. | |
| TVW AG | Basel-Landschaft |
| Twincore | |
| TwingTec AG | Zurich |
| Twint AG | |
| Tydac AG | Bern |
| Typewise | |
| Typo3 | Zug |
| TYPO3FORUM | Zurich |
| Typos Type & Image Design | Zurich |
| Übermorgen Ventures AG | |
| Ubique Innovation AG | Zurich |
| UBit Schweiz AG | Zurich |
| UBS | |
| Ugomo AG | Bern |