| Trierra Soft | Plovdiv |
| Trixir | Sofia |
| TTEC Bulgaria | Sofia |
| Tumba Solutions | Sofia |
| TVM Engineering Services Ltd | |
| Tweerous OOD | Sofia |
| Ubitrack | Sofia |
| UltraNet | Sofia |
| UltraPlay | Sofia |
| UltraServer | Plovdiv |
| UMD-Studio | Plovdiv |
| Umni Ltd | Sofia |
| Unacs | Sofia |
| Underline | Varna |
| Unicom Services Ltd | Sofia |
| Unicoms | Varna |
| Unicontsoft | Sofia |
| Unisis Ltd | Sofia |
| Unisoftware | Sofia |
| United Partners | Sofia |
| University of Economics - Varna | Varna |
| University of Food Technologies in Plovdiv | Plovdiv |
| University of Library Studies and Information Technologies | Sofia |
| University of National and World Economy | Sofia |
| University of Sofia "St. Kliment Ohridski" - Faculty of Mathematics and Informatics | Sofia |
| University of Sofia - Department of Information Technologies | Sofia |
| University of Telecommunications and Posts | Sofia |
| University of Veliko Tarnovo | Veliko Tarnovo |
| UnrealSoft Ltd | Sofia |
| Upnetix | Sofia |
| UXP | Sofia |
| Valbo Net | Sofia |
| Valentin Petroff | Sofia |
| Vali Computers | Sofia |
| VanboDevelops | |
| Vario | Sofia |
| Varna University of Management | Varna |
| Varna Web | Varna |
| Varna Webdesign | Varna |
| VarnaLab | Varna |
| Varnasoft Ltd | Varna |
| Vedesoft EOOD | Sofia |
| Viblast Ltd | Sofia |
| ViewPoint | Sofia |
| Vintech Ltd | Varna |
| Vipe Studio | Sofia |
| Virtualna Zona | |
| Viscomp | Sofia |
| Visteo Electronics Bulgaria | Sofia |
| Vitosha Venture Partners Ltd | Sofia |