| SupraSoft | Bucharest |
| Supravirtual S.R.L. | |
| Supreme Digital Ninja | |
| Surfsite | |
| SVT Electronics | |
| SweetLime | |
| Swiss Solutions | |
| Symphopay | Bucharest |
| SyncRO Soft S.R.L. | Dolj |
| SyncSys | |
| Synotech Global Services | Bucharest |
| Sypher Solutions | Bucharest |
| Syscom Digital | |
| System Plus S.R.L. | Bucharest |
| Table Electronice | |
| TAGonSoft S.R.L. | |
| Tailent | |
| TARA Interactive | |
| Tarem Software | Bucharest |
| Target Web | Alba |
| Tawro Technology S.R.L. | |
| TBNR Accelerator | Iași |
| Team Extension S.R.L. | |
| TeamArt | |
| Teamnet Development S.R.L. | |
| Teamshare | Bucharest |
| Teba Computers Systems S.R.L. | Bucharest |
| TEC | |
| Tech Breeze | |
| Tech Squad | |
| Tech Ventures Consulting S.R.L. | |
| Techangels | |
| Techcelerator | |
| Technets Enterprises | |
| Techno Volt S.R.L. | |
| TechStar | |
| Techsylvania | Cluj |
| TechTalent | |
| Teen Telecom | Bucharest |
| Telecom Academy | |
| Telekom Romania Mobile | Bucharest |
| TeleportHQ | |
| Teletrans S.A. | Bucharest |
| Tema Energy | Bucharest |
| Temasoft | |
| Tera Software & Consulting | |
| TGS Software | |
| The Big Byte S.R.L. | |
| The Q Agency S.A. | |
| The Q Sector | Dâmbovița |