| Sir Parashurambhau College | |
| Sir Sayyed College, Aurangabad | Maharashtra |
| Sir Syed College | |
| Sir Vithaldas Thackersey College of Home Science | |
| Sir. C. R. Reddy College of Engineering | |
| SIRI IT Solutions Pvt Ltd | |
| Siri Websolutions | |
| Siricom Technology | Karnataka |
| Sirifort Institute of Management Studies | |
| Sirius Info Services Pvt Ltd | Telangana |
| Sirma India | Karnataka |
| SIRO Clinpharm | |
| SISGAIN | |
| Sisoft Technologies | Uttar Pradesh |
| Sister Nibedita Government General Degree College for Girls | |
| Sister Nivedita University | West Bengal |
| Sitarambhai Naranji Patel Institute of Technology & Research Centre, Umrakh | |
| Site Invention | |
| SiteGalore | Tamil Nadu |
| SiteGuide | |
| SiteTech Solutions | |
| SITH | |
| Siti Networks Ltd | Uttar Pradesh |
| SITS SolutionS | |
| SITYOG Institute of Technology | |
| SivaCerulean Technologies | |
| Sivanath Sastri College | West Bengal |
| Sivi AI | Karnataka |
| SIVRA | |
| SIWS College | |
| Six Sigma | Tamil Nadu |
| SIXSOFTMEDIA | Uttar Pradesh |
| Sixth Sense Ventures | |
| SixthBlock Software Solutions Pvt Ltd | Telangana |
| Sixthsense Technologies Pvt Ltd | |
| Sixty One Steps Advertising Pvt Ltd | |
| Sixwebsoft Technology Pvt Ltd | |
| Siya Infotech Solutions Pvt Ltd | Gujarat |
| Siyana Info Solutions | |
| Sizcom Digital | |
| SJ Solutions & Infotech | |
| Sjain Ventures | |
| SJB Institute of Technology | |
| SJC Institute of Technology | |
| SK Internet Technologies Pvt Ltd | Delhi |
| SK Media Works | |
| SK Web World | |
| SKANDA IT Consulting Pvt Ltd | Tamil Nadu |
| Skanda Life Sciences | Karnataka |
| SKC Infotech | |