| Delta-Fly Pharma, Inc. | |
| Deltec Co., Ltd | Osaka |
| Dely Co., Ltd | Tokyo |
| Den-en Chofu University | |
| DeNA Co., Ltd | Tokyo |
| Denkosha Co., Ltd | Tokyo |
| Densan Co., Ltd | Tokyo |
| Densan Co., Ltd | |
| Densan System Co., Ltd | Tokyo |
| Dentsu Soken, Inc. | Tokyo |
| Dentsu Ventures | |
| Design Creationm, Inc. | Osaka |
| Design Homepage, Inc. | Tokyo |
| Design Improvement Co., Ltd | Fukui |
| Designium, Inc. | |
| Dessart Co., Ltd | Tokyo |
| Device Lab Co., Ltd | Ibaraki |
| Devo Co., Ltd | Hokkaido |
| DG Daiwa Ventures, Inc. | |
| DG Incubation Co., Ltd | Tokyo |
| DG Ventures, Inc. | |
| Dhowa Technos Co., Ltd | |
| Dialonet Co., Ltd | Tokyo |
| Diamond Antenna Corporation | Tokyo |
| DIC Co., Ltd | Tokyo |
| Diggle | |
| Digilink Co., Ltd | Tokyo |
| Digireha, Inc. | |
| Digital Arts, Inc. | Tokyo |
| Digital Attendant Co., Ltd | Tokyo |
| Digital Bank, Inc. | Tokyo |
| Digital Communications Co., Ltd | Tokyo |
| Digital Cruise Co., Ltd | Tokyo |
| Digital Data Solution Co., Ltd | Tokyo |
| Digital Garage, Inc. | Tokyo |
| Digital Hearts Co., Ltd | |
| Digital Hollywood Co., Ltd | |
| Digital Humans Co., Ltd | Hyogo |
| Digital Identity Co., Ltd | Tokyo |
| Digital Infinity | Tokyo |
| Digital Knowledge Co., Ltd | Tokyo |
| Digital Platformer Corporation | Tokyo |
| Digital Signal Technology, Inc. | Tokyo |
| Digital Sphere Co., Ltd | Tokyo |
| Digital Technologies Corporation | Hokkaido |
| Digital Wallet Corporation | Tokyo |
| Digital-Effect Network Co., Ltd | Tokyo |
| Digitalbank Co., Ltd | Tokyo |
| DigitalBlast Co., Ltd | Tokyo |
| DigitalCube Co., Ltd | Hyogo |