| TomCoat Oy | South Ostrobothnia |
| Tomorrow Explored | Uusimaa |
| Top Data Science | |
| Tosibox | |
| Total IT Global Finland Oy | |
| Toughbyte Ltd | |
| Traficom | |
| Tramigo Ltd | Uusimaa |
| Transplan Oy | |
| Treamer | |
| Treon Oy | |
| Trex | Pirkanmaa |
| Tribered Oy | Uusimaa |
| Trineco Oy | South Karelia |
| Trineria | |
| Triosoft Oy | Pirkanmaa |
| Triumf Health | |
| Tulos Helsinki Oy | |
| 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 |
| TWICE Commerce | |
| Twinverse | |
| Two Men and a Dog Oy | |
| Työterveyslaitos | |
| Työviesti | |
| TypingMaster | Uusimaa |
| UKK-instituutti | |
| Ultimira Media Network | Uusimaa |
| Ultrahack Hackaton | Uusimaa |
| Unicom Consulting Oy | |
| Unicorn.Codes | Uusimaa |
| UNIKIE | |
| Uniogen Oy | |
| Union Development | |
| University of Helsinki | Uusimaa |
| University of Helsinki - Department of Computer Science | Uusimaa |
| University of Oulu - Mathematical Sciences | North Ostrobothnia |
| University of the Arctic | Lapland |
| Unstoppable Finance GmbH | |
| UpCloud Ltd | |
| Usetrace | Uusimaa |
| Utopia Analytics | Uusimaa |
| Vaadin | Southwest Finland |