| Rajarata University of Sri Lanka | |
| RCS2 Technologies | Western Province |
| Real Work From Anywhere | |
| Ribelz | |
| RoodWave | |
| Rootcode Labs | Western Province |
| Royal Institute of Colombo | |
| Ruban KT | |
| S D Softweb Solutions (Pvt) Ltd | Western Province |
| Sabaragamuwa University of Sri Lanka | |
| Saberion Pvt Ltd | Western Province |
| Saegis Campus | |
| Samsul (Pvt) Ltd | |
| Science Land Corporation (Pvt) Ltd | Western Province |
| SEO Sri Lanka (Pvt) Ltd | |
| Sha Web Design | |
| Sha Web Design | |
| ShoutOUT | Western Province |
| SIBA Campus | |
| Singer Finance (Lanka) plc | Western Province |
| SL BPO | Western Province |
| SLT Digital Services (Pvt) Ltd | Western Province |
| SLTC Research University | |
| Smart E Marketing | |
| Smashy Design (Pvt) Ltd | Western Province |
| Softcodeit Solutions (Pvt) Ltd | Western Province |
| Softlog Solutions | |
| SoftLogic Holdings Ltd | Western Province |
| South Asian Institute of Technology and Medicine | |
| South Eastern University of Sri Lanka | |
| Sri Lanka Association for Software Services Companies | Western Province |
| Sri Lanka Export Development Board | |
| Sri Lanka Institute of Advanced Technological Education | |
| Sri Lanka Institute of Development Administration | |
| Sri Lanka Institute of Information Technology | Western Province |
| Sri Lanka Institute of Nanotechnology (Pvt) Ltd | Western Province |
| Sri Lanka Online | Western Province |
| Sri Lanka Telecom | Western Province |
| STEMUp Educational Foundation | Western Province |
| Suge Global | Western Province |
| Sumathi Global Consolidated (Pvt) Ltd | Western Province |
| Superwebglow | Western Province |
| SupremeSAT | |
| SupremeSAT (Pvt) Ltd | Western Province |
| Synotec Holdings (Pvt) Ltd | |
| SyntelligenceIT | |
| Sysco LABS | Western Province |
| Tally Solutions | Western Province |
| Tassei Tech Solution (Pvt) Ltd | |
| Tech One Global | Western Province |