| Sogang University - Department of Mathematics | Seoul |
| SolGent Co., Ltd | Daejeon |
| SolGent Co., Ltd | |
| Solusseum, Inc. | Seoul |
| Songho University | |
| Songuhyun Investments | Seoul |
| Songwon University | |
| Sonnet.ai | Daegu |
| Sookmyung Women's University | Seoul |
| Soon Chun Hyang University | South Chungcheong |
| Soongsil University | |
| Soonhan Co., Ltd | Gyeonggi |
| Soosung Defense Industries Ltd | North Gyeongsang |
| Sopoong Ventures Corporation | Gangwon |
| Soteria, Inc. | Seoul |
| Sovargen Co., Ltd | |
| Spacewalk | Seoul |
| SPARK Biopharma, Inc. | |
| SparkLabs | Seoul |
| Spatial Data Services | Seoul |
| Spendit Co., Ltd | Seoul |
| Spiceware Co., Ltd | Seoul |
| Spire Technology, Inc. | Seoul |
| SPM Co., Ltd | |
| SpringCamp | Seoul |
| SSenStone, Inc. | Seoul |
| ST Pharm | |
| ST Unitas | |
| Stamper Co., Ltd | Seoul |
| Standigm, Inc. | Seoul |
| Startlink | Seoul |
| Startup Alliance | Seoul |
| Startup Radar | Seoul |
| Startup Research | |
| Stealth Solution Co., Ltd | Seoul |
| Stem Cell Treatment & Research Institute | Seoul |
| STG Ventures | Seoul |
| STgen Bio Co., Ltd | Incheon |
| Stonebridge Holdings, Inc. | |
| Stonebridge Ventures | Seoul |
| Streami | Seoul |
| Studio Mate Co., Ltd | Seoul |
| Sudo International University | |
| Sugentech, Inc. | |
| Sun Moon University | |
| SunBio | Gyeonggi |
| Sunbo Angel Partners | Busan |
| Suncheon Jeil College | |
| Sunchon National University | |
| Sung Woon University | |