| START Summit | |
| StartAngels Network | |
| Startfeld | St. Gallen |
| Startive Ventures | Zurich |
| Startup Accelerator | Zurich |
| Startup Balkans | |
| Startup Bites | |
| Startup Board Academy | |
| Startup Campus | |
| Startup Days | |
| Startup INVEST | |
| Startup Nights | |
| Startup Weekend Switzerland | |
| Startup Zentrum Zürich GmbH | |
| Startup.ch | St. Gallen |
| StartupBlink | Zurich |
| Startups.ch | |
| startupticker.ch | |
| Startwerk.ch | |
| Startzentrum | |
| Station | |
| Statoo Consulting | Bern |
| Staub Consulting | Bern |
| Stellar Datenrettung | Zurich |
| Stiftung für technologische Innovation STI | |
| Stiftung Futur | |
| Stimit AG | |
| STMicroelectronics | Geneva |
| Stonestep S.A. | |
| STOXX Ltd | |
| Stragen Pharma S.A. | |
| Strategyzer AG | Zurich |
| StrathWeb | Zurich |
| Stratpharma AG | |
| Streamline AG | Bern |
| Streamr | |
| Stromal Therapeutics AG | |
| strongSec | Zurich |
| Stryber AG | |
| STS Software GmbH | |
| Studerus AG | Zurich |
| Studio Hoppe GmbH | Thurgau |
| Studio Informatica S.A. | Basel-Landschaft |
| StudioAlpha Capital | |
| Studying in Switzerland | |
| SUA Telenet GmbH | Schaffhausen |
| Substring GmbH | Bern |
| Subwave.com | Basel-Stadt |
| Suisseo | Vaud |
| SUN Bioscience | |