| MabTics | |
| Mae Company | Seoul |
| Magna Investment | Seoul |
| Magnachip | North Chungcheong |
| Magnex Co., Ltd | North Chungcheong |
| MakinaRocks, Inc. | Seoul |
| Mango Cloud | Busan |
| Marine Electronics | Busan |
| Mark & Company | |
| Mars Auto | Seoul |
| Masan University | |
| Masangsoft, Inc. | Busan |
| Mashup Ventures | |
| Master Co., Ltd | Seoul |
| Mathflat | |
| Mathpresso | Seoul |
| Maum.ai, Inc. | |
| MAVEN Cloud Service Co., Ltd | Seoul |
| MAXST Co., Ltd | Seoul |
| MDimune, Inc. | Seoul |
| MeasureCommerce, Inc. | |
| Measurenix Co., Ltd | |
| Medi Plus Solution Co., Ltd | Seoul |
| MEDI&GENE | |
| Medical Research Information Center | |
| Medicisoft Corporation | Seoul |
| MediMabBio | |
| Medinno Pharmaceutical Technology | |
| MedInTech Co., Ltd | Seoul |
| MEDIPOST Co., Ltd | Gyeonggi |
| MedPacto, Inc. | Seoul |
| Megazone Cloud Corporation | Seoul |
| Melcon Co., Ltd | Gyeonggi |
| MEPSGEN Co., Ltd | |
| MetaCamp, Inc. | Gyeonggi |
| Metanet | Seoul |
| MetiMedi Pharmaceuticals | |
| Metis Co., Ltd | South Chungcheong |
| Mgame Corporation | Seoul |
| MI Tech Co., Ltd | Gyeonggi |
| MicrobiotiX | |
| MicroDigital | |
| Microsoft Korea | Seoul |
| MIDAS Information Technology Co., Ltd | Seoul |
| Mind AI | Seoul |
| Mindlogic, Inc. | |
| Ministry of Science and ICT | Sejong |
| Minitab | Seoul |
| Mint Venture Partners | |
| Mirae Corporation | South Chungcheong |