| Thraexsoftware.com | Uusimaa |
| TicBits Ltd | |
| Ticker Software | Uusimaa |
| Tieteomyrsky Oy | Kymenlaakso |
| TietoEVERY | Uusimaa |
| Tietokeskus | Southwest Finland |
| Tietokonekauppa.fi | Southwest Finland |
| Tietotekniikan ja Elektroniikan Seura | Uusimaa |
| TILT Biotherapeutics Oy | |
| Timegate | |
| Timehouse Oy | Uusimaa |
| TinyApp | |
| TIVIA ry | Uusimaa |
| TJ-Design Avoin Yhtiö | Tavastia Proper |
| TNNET Oy | |
| Tofuture Oy | Uusimaa |
| TomCoat Oy | South Ostrobothnia |
| Tomorrow Explored | Uusimaa |
| Top Data Science | |
| Tosibox | |
| Total IT Global Finland Oy | |
| Toughbyte Ltd | |
| Traficom | |
| Tramigo Ltd | Uusimaa |
| Transplan Oy | |
| Treon Oy | |
| Trex | Pirkanmaa |
| Tribered | Uusimaa |
| Trineco Oy | South Karelia |
| Triosoft Oy | Pirkanmaa |
| Triumf Health | |
| Tuned Rocks | |
| Turku Bioscience | |
| Turku Business Region | Southwest Finland |
| Turku Centre for Computer Science | Southwest Finland |
| Turku Unix Users Group | Southwest Finland |
| Turun ammattikorkeakoulu | Southwest Finland |
| Turun yliopisto | Southwest Finland |
| Turun yliopisto - Teknillinen tiedekunta | Southwest Finland |
| Tuxera, Inc. | Uusimaa |
| Two Men and a Dog Oy | |
| Työviesti | |
| TypingMaster | Uusimaa |
| Ultimira Media Network | Uusimaa |
| Ultrahack Hackaton | Uusimaa |
| Unicorn.Codes | Uusimaa |
| Uniogen Oy | |
| University of Helsinki | Uusimaa |
| University of Helsinki - Department of Computer Science | |
| University of Helsinki - Deppartment of Computer Science | Uusimaa |