| subincho | Sofia |
| Summer Cart | Sofia |
| Superhosting.bg | Sofia |
| Support OOED | Sofia |
| SurroundBG | |
| Suzara Design Studio | Sofia |
| Sveon България | Sofia |
| Svetlin Nakov | Sofia |
| Swipe.bg | Sofia |
| Synergyc | Sofia |
| Sysco Set Electronics Ltd | Sofia |
| Systech Ltd | Sofia |
| Take.bg | Sofia |
| Tangra Technology Group Ltd | Sofia |
| TBI Info | Sofia |
| TBS Ltd | Sofia |
| Team Schedule | |
| Team VISION Bulgaria | Sofia |
| Tech Talks | Sofia |
| Tech4Kids | Sofia |
| TechNews.bg | Sofia |
| Technical University of Gabrovo | Gabrovo |
| Technofy Ltd | Sofia |
| TechnoLogica | |
| Technology 4 Business | Sofia |
| Technology School Electronic Systems | Sofia |
| TechnoMarket | Sofia |
| Technopolis | Sofia |
| Technopro | Sofia |
| TechPods | |
| TechWork | Sofia |
| Telecom Service Bulgaria | Sofia |
| Telecoms | Sofia |
| Telelink | |
| Telelink Bulgaria EAD | Sofia |
| Telelink Business Services | Sofia |
| Telenor | Sofia |
| Telerik | Sofia |
| Telerik Academy | |
| Telnet.bg | Sofia |
| Tendrik | Plovdiv |
| TETRACOM Interactive Solutions Ltd | Sofia |
| The B Team | |
| The Business Institute | |
| The Mags | Sofia |
| The Recursive | Sofia |
| The Sour Studio | |
| ThinkWeb | Sofia |
| Tickey | Sofia |
| Tiger Technology | Sofia |