| Aithe Nutrigene Co., Ltd | Seoul |
| AIZEN | Seoul |
| AJ Networks Corporation | Seoul |
| Ajou University | Gyeonggi |
| Aju IB Investment Co., Ltd | Seoul |
| Aju Pharm Co., Ltd | Seoul |
| Algory Technology | Seoul |
| All-Teaching | Seoul |
| Alpinion Medical Systems Co., Ltd | Seoul |
| Altaplex Co., Ltd | Seoul |
| Alteogen, Inc. | Daejeon |
| Alticast Corporation | Seoul |
| Altoran Ventures | Seoul |
| American Chamber of Commerce in Korea | |
| Anam Electronics Co., Ltd | Seoul |
| ANP Corporation | Seoul |
| AnyCert | Seoul |
| AP Systems | Gyeonggi |
| Appia Engineering Co., Ltd | South Gyeongsang |
| Aprogen | |
| AptaBio | Gyeonggi |
| Aptamer Sciences, Inc. | |
| ARBORMED Co., Ltd | |
| ArchiLine Group Systems, Inc. | Seoul |
| AriBio | Gyeonggi |
| Arion Technology | Seoul |
| AroIntech Co., Ltd | Seoul |
| Asadal.com | Seoul |
| Ascendo Ventures | Seoul |
| Ascensive Assets | Seoul |
| ASE Korea, Inc. | Seoul |
| Asia LIFE University | |
| Asia-Pacific Satellite Communications Council | Gyeonggi |
| Asiance | Seoul |
| AsiaTechDaily | Seoul |
| Asnet Co., Ltd | Seoul |
| Aston Sci., Inc. | Seoul |
| ATIK Co., Ltd | Gyeonggi |
| Atinum Investment Co., Ltd | Seoul |
| Aton, Inc. | |
| Auros Technology, Inc. | Gyeonggi |
| Autobase, Inc. | Gyeonggi |
| Autocrypt Co., Ltd | Seoul |
| Autodesk Korea | Seoul |
| Autopus | Seoul |
| AutoSet Developer Group | Seoul |
| Autotac Bio, Inc. | Seoul |
| AVANsoft Co., Ltd | Seoul |
| AVEapp, Inc. | |
| Avelos Therapeutics, Inc. | Seoul |