| Startpack | Moscow |
| StartTrack | Moscow |
| Startup Magic | Moscow |
| Startup Network | Moscow |
| Startup Tour | Moscow |
| Startup Village | Moscow |
| Startup Village | |
| Statanly Technologies | |
| Steadyhost | Moscow |
| Stimulsoft | Smolensk |
| Stoik Software | Moscow |
| StormWall.pro | |
| Storytelling Software | Rostov |
| StudyApp | |
| StudyApps | |
| Sunmedia studio | Krasnodar |
| Sunrav Software | Moscow |
| Surprise Me | |
| SV-Soft | Moscow |
| SvyazKomplekt | Moscow |
| SWS | Voronezh |
| SWTecNN, LLC | |
| Synergy Innovations | Moscow |
| Sysinfo Lab | Tambov |
| SYSsoft | Moscow |
| Systech | Kaliningrad |
| Systemz | |
| Syzran-Soft | Moscow |
| T&D Systems, Inc. | Pskov |
| T8 Company | |
| Taiga System | |
| Tavrical National University - Faculty of Mathematics | Crimea |
| TealTech Capital | Moscow |
| Teamcoding | |
| TeamLead Conf | |
| Teamo.ru | |
| TechAudit LLC | |
| Techforward | |
| Technopark Strogino | Moscow |
| TECHNORED | |
| Tecnoplys | Tatarstan |
| Tele2 Россия | |
| Telecom Business Service | Moscow |
| Telecomax Ltd | Moscow |
| TemplateBest | Moscow |
| Tesla LLC | Ulyanovsk |
| Texcis Trade | Moscow |
| TextAppliance | |
| The Mop | Yaroslavl |
| Tigersoft | Moscow |