| Stream Startup Festival | Pirkanmaa |
| StyleDoubler | |
| Sunit Oy | Kainuu |
| Suomen Digimarkkinointi Oy | |
| Suomen Pankki | |
| Suomi.fi | |
| Super Eclectic Ay | Uusimaa |
| Supercell Oy | |
| Supercell Oy | |
| Superhero Capital | |
| Supermetrics | |
| Superplus Games Ltd | |
| SurgeryVision | |
| Surgify Medical Oy | |
| SurviveJS | |
| Swappie | |
| Swarmia | |
| Swedbank Finland | Uusimaa |
| Sympa Oy | Uusimaa |
| Syncron Tech Oy | |
| Synergi Solutions Oy | |
| SYNLAB Suomi | |
| SYRINX Bioanalytics Oy | |
| Systam Ltd | |
| Systam Oy | |
| Taiqa Digital Oy | Uusimaa |
| Taitonetti Oy | |
| Taival Advisory Oy | |
| Talenom | |
| Taloset Oy | |
| Tampereen ammattikorkeakoulu | Pirkanmaa |
| Tampereen yliopisto | Pirkanmaa |
| Tascomm Engineering Oy | Uusimaa |
| Technopolis Holding plc | |
| Tecnotree Corporation | Uusimaa |
| Tekla Solutions Corporation | Uusimaa |
| Teknoventure Oy | North Ostrobothnia |
| Teleste Corporation | Southwest Finland |
| Telia Inmics-Nebula | Uusimaa |
| Tenboron Ltd | |
| Teraloop Oy | |
| Teraset Finland Oy | Uusimaa |
| Terkko Health Hub | |
| Tesi (Suomen Teollisuussijoitus Oy) | |
| Tespack | |
| Tesseract Group Oy | |
| Testwell Oy | Pirkanmaa |
| The Qt Company | Uusimaa |
| Theatre.js Oy | |
| Themo | |