| Sofmap Co., Ltd | Tokyo |
| Soft and Logic Co., Ltd | Hyogo |
| Soft Gear Co., Ltd | Tokyo |
| Soft Kaihatsu Corporation | Tokyo |
| Soft Planet Co., Ltd | Fukuoka |
| Soft Vision | Tokyo |
| Softas Co., Ltd | Tokyo |
| SoftBank Corporation | |
| SoftBank Group | Tokyo |
| SoftBank Robotics Group Corporation | Tokyo |
| SoftBank Technology Corporation | Tokyo |
| Softbeat Co., Ltd | Hokkaido |
| SOFTBRAIN Co., Ltd | Tokyo |
| SoftCube Co., Ltd | Osaka |
| Softech Co., Ltd | Tokyo |
| Softfront Holdings | Tokyo |
| SOFTGIKEN Co., Ltd | Tokyo |
| Softipa Co., Ltd | Tokyo |
| Softnet Co., Ltd | Tokyo |
| Softom Co., Ltd | Tokyo |
| Softplex Co., Ltd | Tokyo |
| SoftRoid Co., Ltd | Tokyo |
| Software Control Corporation | Tokyo |
| Software Information Center | Tokyo |
| Software Information Co., Ltd | Tokyo |
| Software Research Associates, Inc. | Tokyo |
| Software Service Corporation | Tokyo |
| Software Technology Corporation | Tokyo |
| Softwing Co., Ltd | Chiba |
| Sofu System Co., Ltd | Niigata |
| Sojo University | |
| Soka University | |
| Solar Partners Co., Ltd | Tokyo |
| Solasia Pharma K.K. | |
| Solize Co., Ltd | Tokyo |
| SolNac Corporation | Osaka |
| Solton Co., Ltd | Kanagawa |
| SolutionPlus Co., Ltd | Tokyo |
| Sompo Systems, Inc. | |
| Sonicjam, Inc. | |
| Sonicwave Co., Ltd | Tokyo |
| Sonix Co., Ltd | Tokyo |
| Sonora Women's University | |
| Sonotrigger Co., Ltd | Tokyo |
| Sony Computer Science Laboratories, Inc. | |
| Sony Corporation | Tokyo |
| Sony Digital Network Applications, Inc. | Tokyo |
| Sony Financial Group, Inc. | |
| Sony Global Solutions Co., Ltd | Tokyo |
| Sony Interactive Entertainment | Tokyo |