| Tireal Company | Moscow |
| TKB Investment Partners, LLC | |
| TN Communications | Moscow |
| Tolko-Soft | Moscow |
| Tomsk State University of Architecture and Building | Tomsk |
| Tomsk State University of Control Systems and Radioelectronics | Tomsk |
| TopMission.ru | |
| Topvisor Co., Ltd | Saint Petersburg |
| Touch Instinct | Saint Petersburg |
| ToWave.ru | |
| Tproger | |
| TrackStudio | Smolensk |
| Trade Telecom | Moscow |
| Traffic Reg Software | Moscow |
| Transitnet | Moscow |
| Travel.ru | |
| Treolan | |
| Trial Electronics | Moscow |
| TRINET.Group | |
| Trinity Corporate Projects | Moscow |
| Trionix | Astrakhan |
| Trsoft | Moscow |
| true.code | Irkutsk |
| ttgLabs | |
| Tuning-soft | Moscow |
| TUT.su | Moscow |
| Tutasoft | Moscow |
| TutorOnline | |
| TWIN | |
| Two Pilots | Moscow |
| Tydex | Saint Petersburg |
| UBIC Datahub | |
| UbiqMobile | Saint Petersburg |
| Ubirator | |
| uCalc | |
| UCOZ | Moscow |
| UIDesign Group | Moscow |
| Ujin | |
| Umbrella IT | Moscow |
| Undef | Tatarstan |
| UNIM | |
| Unionsoft Plus LLC | Novosibirsk |
| UniSender | |
| Unisound | |
| Unitile | |
| Unitsolutions | |
| Universal Math Solver | Saint Petersburg |
| Universe Ventures | Moscow |
| University of Artifial Intelligence | |
| Uniweb | Moscow |