| MEGAMASTER 1978778 · TMA1283715 | MEGA GROUP HOLDINGS (PTY) LIMITED | 8 Hand9 Electronics11 Lighting+1 | Registered | 2025 |
| MUGMASTER 0780510 · TMA484341 | STAHLS' INC. | 7 Machines | Registered | 1997 |
| MIGMASTER 0710170 · TMA432249 | THE ESAB GROUP, INC. | 7 Machines | Registered | 1994 |
| MIXMASTER 0157806 · TMDA55042 | Sunbeam Products, Inc. | 7 Machines | Registered | 1932 |
| MCMASTER 0923814 · design | MCMASTER UNIVERSITY | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 2016 |
| MAZEMASTER 0911573 | TORONTO CATHOLIC DISTRICT SCHOOL BOARD | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 2000 |
| MAZEMASTER 0908036 | METROPOLITAN SEPARATE SCHOOL BOARD | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 1997 |
| MCMASTER 0903831 | MCMASTER UNIVERSITY | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 1989 |
| MOCCAMASTER 2103338 · TMA1180482 | an individual | 11 Lighting | Registered | 2023 |
| MASKMAKER 2066782 · TMA1134183 | an individual | 9 Electronics41 Education | Registered | 2022 |
| MESSENGER 1290936 · TMA719604 | Liaison Software Corporation | 9 Electronics | Registered | 2008 |
| MESSENGER 1271123 · TMA732893 | Computerized Security Systems, Inc. a Michigan corporation | 9 Electronics | Registered | 2009 |
| MESSENGER 0890034 · TMA543219 | Plant Health Care, Inc. | 1 Chemicals5 Pharmaceuticals | Registered | 2001 |
| Missionstar 2081371 · TMA1168536 | RWD International Inc. | 9 Electronics | Registered | 2023 |
| MAGNECTION 2261920 · TMA1281323 | LF, LLC | 11 Lighting | Registered | 2025 |
| MAXENIKIT 2261918 · TMA1281321 | Jinhua Tengyi Trading Co. Ltd. | 8 Hand | Registered | 2025 |
| Mesinsefra 2254146 · TMA1273073 | an individual | 25 Clothing | Registered | 2024 |
| MSINGI 2253768 · TMA1272954 | an individual | 41 Education | Registered | 2024 |
| MAXIMISE 2250722 · TMA1268864 · design | Owner not listed | 9 Electronics16 Paper35 Advertising+1 | Registered | 2024 |
| MISSMOSA 2250542 · TMA1270010 | Owner not listed | 33 Wine | Registered | 2024 |
| mSYNC 2235144 · TMA1259729 | ModernaTX, Inc. | 5 Pharmaceuticals | Registered | 2024 |
| MAGMAG 2227364 · TMA1252658 · design | Waydhanar Co.Ltd. | 29 Meat | Registered | 2024 |
| MZOIMZO 2212437 · TMA1253753 | Dongguan Weixin Technology Co. Ltd. | 20 Furniture | Registered | 2024 |
| MOKENS 2211999 · TMA1252413 | an individual | 25 Clothing | Registered | 2024 |
| MACHINIST 2210131 · TMA1241745 · design | an individual | 8 Hand | Registered | 2024 |