| Swiss Solutions | |
| Symphopay | Bucharest |
| SyncRO Soft S.R.L. | Dolj |
| Synotech Global Services | Bucharest |
| Sypher Solutions | Bucharest |
| System Plus S.R.L. | Bucharest |
| Table Electronice | |
| TAGonSoft S.R.L. | |
| Tailent | |
| Tarem Software | Bucharest |
| Target Web | Alba |
| TBNR Accelerator | Iași |
| Teamnet Development S.R.L. | |
| Teamshare | Bucharest |
| Teba Computers Systems S.R.L. | Bucharest |
| Tech Ventures Consulting S.R.L. | |
| Techangels | |
| Techcelerator | |
| Techno Volt S.R.L. | |
| TechStar | |
| Techsylvania | Cluj |
| TechVentures Bank | |
| Teen Telecom | Bucharest |
| Telecom Academy | |
| Telekom Romania Mobile | Bucharest |
| Telekom Romania Mobile | |
| TeleportHQ | |
| Teletrans S.A. | Bucharest |
| Tema Energy | Bucharest |
| Temasoft | |
| Tera Software & Consulting | |
| TGS Software | |
| The Q Agency S.A. | |
| The Q Agency S.A. | |
| The Q Sector | Dâmbovița |
| Thecon | |
| Themeisle | |
| Themesberg | |
| Thinkdigital | Bucharest |
| ThinkOut | Iași |
| Thor Panel | Bucharest |
| Threeangle Software Solutions S.R.L. | |
| Tiberiu Popoviciu Institute of Numerical Analysis, Romanian Academy | |
| Timișoara Startups | Timiș |
| TNT Computers S.R.L. | |
| Today's Search Engine Marketing | Bucharest |
| Toko | Bucharest |
| Top Edge Engineering | Dolj |
| TopTech | Hunedoara |
| Toptech Projects S.R.L. | |