| USED-PC | Tokyo |
| Userside | Shizuoka |
| Ushio Co., Ltd | Tokyo |
| Ushio Opto Semiconductors, Inc. | Kyoto |
| Ustron Corporation | Tokyo |
| UTEC Co., Ltd | Tokyo |
| UTokyo Innovation Platform Co., Ltd | |
| Utsunomiya Juniorcollage | |
| Utsunomiya Kyowa University | |
| UXLINK | |
| Uyemura Co., Ltd | Tokyo |
| Uyo Gakuen College | |
| Uysunomiya University | |
| V-Technology Co., Ltd | Kanagawa |
| VA Linux Systems Japan | Tokyo |
| VAAK | Tokyo |
| Valtec Co., Ltd | Tokyo |
| Value Domain | Osaka |
| Value Software Corporation | Tokyo |
| ValueCommerce Co., Ltd | Tokyo |
| VanBee Co., Ltd | Tokyo |
| Vasara Co., Ltd | Tokyo |
| VCN Group Co., Ltd | Tokyo |
| Vector, Inc. | Tokyo |
| Venture Café Tokyo | Tokyo |
| Venture Labo Co., Ltd | Tokyo |
| Venture Net Co., Ltd | Tokyo |
| VeriTrans, Inc. | Tokyo |
| Vertex Systems, Inc. | Tokyo |
| Vine Linux | Tokyo |
| Virtual Cast, Inc. | |
| VirtualCast Co., Ltd | Tokyo |
| VirtualTech Japan Co., Ltd | Tokyo |
| Virtusize | Tokyo |
| VisaQ, Inc. | |
| Visio.jp | Tokyo |
| Vision Co., Ltd | Tokyo |
| Vision Incubate | |
| Visional | Tokyo |
| VISITS Technologies, Inc. | Tokyo |
| Visualiz, Inc. | |
| VIXIA, Inc. | Osaka |
| Vook | Tokyo |
| VPLUS Co., Ltd | Osaka |
| VXI Japan Corporation | Tokyo |
| W, Inc. | |
| W, Inc. | |
| W-Vase Corporation | Tokyo |
| Wacom | Saitama |
| Wado Co., Ltd | Tokyo |