| Name | Region |
|---|---|
| SelMatic Ltd | |
| Sensika Technologies Ltd | |
| Seo Bulgaria | Sofia |
| SEO Консулт | Sofia |
| SEO оптимизация от инж | Sofia |
| SEO-BG | Sofia |
| SEO.domains | |
| SEOMarketing.BG | Sofia |
| SEOMAX | Plovdiv |
| SeoWebDesign | Plovdiv |
| Serpact | |
| Service Centrix Ltd | |
| Serviz.BG | Sofia |
| SessionStack | Sofia |
| SetCom.bg | Sofia |
| Sevtware | |
| Shelly | |
| Shevitza | Sofia |
| Shkolo.bg | Sofia |
| Shtrak | Varna |
| Sibel | Sofia |
| SilvaeTechnologies | Ruse |
| Silverline Capital | |
| Simplifix | |
| Simvoly Applications Ltd | Sofia |
| Sinetbg | Sofia |
| Sirius Software | |
| Sirma | Sofia |
| Sirma Solutions | Sofia |
| SIS Group | Sofia |
| SiS Ltd | Sofia |
| SIS Tedchnology | Sofia |
| SiteGround Hosting Ltd | Sofia |
| SkillAbility Soft Ltd | |
| Skillo Ltd | |
| SkyCode Ltd | Sofia |
| Slavov Design Studio | Stara Zagora |
| Slavov Studio | |
| Smarch | |
| Smart Bytes Software | |
| Smart Century Technologies Ltd | Stara Zagora |
| Smart Farm Robotix Ltd | |
| Smart Media | Sofia |
| Smart Online | Sofia |
| Smart React Chart | Sofia |
| Smartcom Bulgaria AD | Sofia |
| SmartIT | Sofia |
| Smartmoney | Sofia |
| SMS.bg | Sofia |
| SNET IT Services, LLC |