| AMG Solution Co., Ltd | Tokyo |
| AMIC Co., Ltd | Nara |
| Amptalk Co., Ltd | Tokyo |
| Amufi, Inc. | |
| ANA Digital Gate Co., Ltd | Tokyo |
| Anaheim Technology | Tokyo |
| AnalogTech K.K. | |
| Andor Co., Ltd | Tokyo |
| ANDPAD | |
| Andpad Co., Ltd | Miyagi |
| Angel Bridge Co., Ltd | Tokyo |
| Anges Co., Ltd | Osaka |
| ANK Company Co., Ltd | Tokyo |
| Annie Co., Ltd | Tokyo |
| Annis Corporation | Tokyo |
| ANOBAKA Co., Ltd | Tokyo |
| Anokaba Human Capital | Tokyo |
| Another Lane Co., Ltd | Tokyo |
| ANRI | Tokyo |
| Anritsu | Kanagawa |
| Antaa Co., Ltd | Tokyo |
| Antenna Giken Co., Ltd | Saitama |
| Antenna House, Inc. | Tokyo |
| Antenna Technology, Inc. | Saitama |
| Anywire Corporation | |
| Anzai Medical Co., Ltd | Tokyo |
| Aoi Electronics Co., Ltd | Kagawa |
| Aomori Akenohoshi Junior College | |
| Aomori Chuo Gakuin University | |
| Aomori Public University | |
| Aomori University | |
| Aomori University of Health and Welfare | |
| Aoyama Gakuin University | |
| Aoyama Special Steel Co., Ltd | |
| Aoyama Startup Acceleration Center | Tokyo |
| Aplix Corporation | Tokyo |
| Apollo Information System Co., Ltd | Miyagi |
| Apollocreate Co., Ltd | Tokyo |
| AppBank | Tokyo |
| Appco Group Japan Co., Ltd | Tokyo |
| Appdate Co., Ltd | Tokyo |
| Appex Corporation | Tokyo |
| Apple Doctor Co., Ltd | Nagasaki |
| Apple Ginza | Tokyo |
| Apple Japan | Tokyo |
| Apple Nagoya Sakae | Aichi |
| Apple Shibuya | Tokyo |
| Apple Shinsaibashi | Osaka |
| Appleple, Inc. | Aichi |
| Appli System | Hokkaido |