| Snappify | |
| SobIT GmbH | |
| Social Entrepreneurship Network Austria | |
| SocialWorkHUB | |
| Software Competence Center Hagenberg GmbH | |
| Software Daten Service GmbH | Vienna |
| Software Development Lohninger | Lower Austria |
| Software Pointers | Lower Austria |
| Software Quality Experts GmbH | |
| Software-Management GmbH | Upper Austria |
| Softwarehaus Kerth | Vienna |
| Softwarepark Hagenberg | Upper Austria |
| SoftwareQHQ GmbH | |
| SOFTwerk Professional Automation GmbH | Upper Austria |
| Solgate GmbH | |
| Solution IT Service & Handel e.U. | Vienna |
| Solvistas GmbH | Upper Austria |
| Soma Reality GmbH | |
| Sonible GmbH | |
| sourceheads Information Technology GmbH | |
| Space Generation Advisory Council | Vienna |
| Space Individuals | |
| Space.TimeTag KG | |
| space24 Websolutions | Lower Austria |
| Spacelend | |
| SparxSystems Software GmbH | Vienna |
| Specialis IT GmbH | Styria |
| Speech Code Produktsicherheits GmbH | Vienna |
| Speedinvest | Vienna |
| Speedinvest Heroes Consulting GmbH | |
| Speedinvest Pirates GmbH | |
| SplashDev e.U. | |
| Splitbee | |
| SPP digital GmbH | |
| SPP Handelsges.m.b.H. | Vienna |
| Sprecher Automation GmbH | |
| SPS Industrie-Elektrik GmbH | Upper Austria |
| SPS Technik GmbH | Lower Austria |
| Spusu Austria | |
| Spydeception | Vienna |
| Stacked Marketer | |
| Startup Live | Vienna |
| Startup Playground | |
| Startup.Tirol | Tyrol |
| startup300 | |
| StartUs | Vienna |
| StartUs Insights | Vienna |
| StartUs Magazine | Vienna |
| Staymate OG | |
| Steinbauer IT GmbH | Styria |