| 100 &100 Venture Capital | Seoul |
| 123Promotion | Seoul |
| 1st Biotherapeutics, Inc. | Gyeonggi |
| 21 Century Co., Ltd | Gyeonggi |
| 2Digit Co., Ltd | Gyeonggi |
| 360 Hexa World | |
| 3billion, Inc. | |
| 3i, Inc. | Seoul |
| 3S Korea Co., Ltd | Seoul |
| 3SOFTPLUS | Seoul |
| 42dot | Seoul |
| 42Maru, Inc. | Seoul |
| 49week Studio | Seoul |
| 4:33 Creative Lab | Seoul |
| 4CSoft | Seoul |
| 500 Startups Korea | Seoul |
| 8Byte Co., Ltd | Seoul |
| A.I. Soft Co., Ltd | Seoul |
| A1 PROs Co., Ltd | Gyeonggi |
| AbClon Co., Ltd | Seoul |
| Abco Electronics Co., Ltd | Gyeonggi |
| ABION BIO | Seoul |
| ABL Bio | Gyeonggi |
| Ableinfo | Seoul |
| Acorn Publishing Co., Ltd | Seoul |
| Acoulab Co., Ltd | Gyeonggi |
| ActaSoft Co., Ltd | Seoul |
| ActionPower Corporation | Seoul |
| Adenasoft | |
| Adiscope | Gyeonggi |
| Admotech, Inc. | Daejeon |
| ADOP | Seoul |
| Advanced & Applied Technologies Co., Ltd | Gyeonggi |
| Advanced Semiconductor Business, Inc. | Daejeon |
| Advanced Technology Co., Ltd | Incheon |
| AETS Co., Ltd | Gyeonggi |
| Agricultural Cooperative University | |
| AhnLab, Inc. | Gyeonggi |
| Ahope | Seoul |
| Ahram Biosystems, Inc. | Seoul |
| Ahranta, Inc. | Seoul |
| Aicel Technologies, Inc. | Seoul |
| Aidin Robotics | Gyeonggi |
| AIDOT | Seoul |
| AIM Systems Co., Ltd | Gyeonggi |
| AIMED | Seoul |
| AirCUVE, Inc. | Seoul |
| AirenSoft Co., Ltd | Seoul |
| AirPoint | Daejeon |
| AIRS Medical, Inc. | Seoul |