| AFO Co., Ltd | Tokyo |
| Agencysoft Co., Ltd | Tokyo |
| Agile Media Network Co., Ltd | Tokyo |
| Agility Co., Ltd | Tokyo |
| AGMS Corporation | Tokyo |
| Agood Co., Ltd | Shizuoka |
| Agora-Soft Co., Ltd | Tokyo |
| Agrist Co., Ltd | Miyazaki |
| AGS Corporation | Saitama |
| AgVenture Lab | |
| AH-Software | Tokyo |
| Ahead Biocomputing Co., Ltd | Kanagawa |
| AI Cube, Inc. | |
| AI Inside Co., Ltd | Tokyo |
| AI Medical Service Co., Ltd | Tokyo |
| Ai Robotics Co., Ltd | Tokyo |
| AI Samurai, Inc. | |
| ai-Link | Tokyo |
| Aichi Bunkyo University | |
| Aichi Bunkyo Women's College | |
| Aichi Center for Industry and Science Technology | |
| Aichi Gakuin University | |
| Aichi Gakusen University / College | |
| Aichi Institute of Technology | Tokyo |
| Aichi Konan Gakuen | |
| Aichi Medical University | |
| Aichi Mizuho University | |
| Aichi Prefectural University | |
| Aichi Prefectural University - School of Information Science and Technology | |
| Aichi Sangyo University | |
| Aichi Science & Technology Foundation | |
| Aichi Shukutoku University | |
| Aichi Toho University | |
| Aichi University | |
| Aichi University of Education | |
| Aichi University of Technology | |
| Aichi University of the Arts | |
| Aida Engineering Ltd | |
| Aii Electronic Co., Ltd | Nagano |
| Aikis | Tokyo |
| Aikoku Gakuen Junior College | |
| Aikoku Gakuen University | |
| Aile Ltd | |
| Aim at Entertainment, Inc. | Tokyo |
| AIM internet-service Co., Ltd | Tokyo |
| Aimsnet, Inc. | Tokyo |
| Aino University | |
| Aiphone Co., Ltd | Aichi |
| aiQ Corp. Ltd | Tokyo |
| Air Internet Service Co., Ltd | Tokyo |