| TCS Holdingss Co., Ltd | Tokyo |
| TD Synnex Co., Ltd | Tokyo |
| TDC Soft, Inc. | Tokyo |
| TDK Corporation | Tokyo |
| TDK-Lambda Corporation | Tokyo |
| TEAC Corporation | Tokyo |
| teamS | Tokyo |
| TEAMZ, Inc. | |
| Tech Bureau Corporation | Osaka |
| Tech Fun Corporation | Tokyo |
| Techable | Tokyo |
| TechAcademy | Tokyo |
| Techbeans Co., Ltd | Tokyo |
| TechFirm, Inc. | Tokyo |
| Techfund Co., Ltd | Tokyo |
| TechMatrix Corporation | Tokyo |
| Technical Soft, Inc. | Tokyo |
| Technical Software Co., Ltd | Tokyo |
| Techno Co., Ltd | |
| Techno Core Co., Ltd | Tokyo |
| Techno Corporation Co., Ltd | Kumamoto |
| Techno Dynamics, Inc. | |
| Techno Horizon Co., Ltd | |
| Techno, Inc. | |
| Techno-Creative Co., Ltd | Kumamoto |
| TechnoBox Ltd | Tokyo |
| Technocrats Japan Co., Ltd | Tokyo |
| TechnoCreation Co., Ltd | Tokyo |
| Technol Seven Co., Ltd | Tokyo |
| Technolab Co., Ltd | Osaka |
| Technology International (Japan) Ltd | Kanagawa |
| Technology Seed Incubation Co., Ltd | Kyoto |
| Technonet Co., Ltd | Tokyo |
| TechnoPro Co., Ltd | Tokyo |
| TechnoScope Co., Ltd | |
| Technovell Co., Ltd | Tokyo |
| Technoware Think Co., Ltd | Tokyo |
| Techouse Co., Ltd | Tokyo |
| Techsor Co., Ltd | Tokyo |
| Techspire Co., Ltd | Tokyo |
| TECHSPO Tokyo | |
| Techtom Co., Ltd | Tokyo |
| Techtone | Tokyo |
| Techtouch Co., Ltd | Tokyo |
| TechVan Co., Ltd | Tokyo |
| Tecmo Koei Holdings Co., Ltd | Kanagawa |
| Teijin Pharma Ltd | |
| Teikoku Seiyaku Co., Ltd | Kagawa |
| Teikoku Tsushin Kogyo Co., Ltd | Kanagawa |
| Teikyo Heisei University | |