| COMBOCARE 1650840 · TMA903689 | Roscoe Medical, Inc. | 10 Medical | Registered | 2015 |
| COMPUCAGE 0881526 · TMA547662 | Compucage International Inc. | 9 Electronics20 Furniture | Registered | 2001 |
| CompCote 1266989 · TMA729202 | Compcote International Inc. | 40 Treatment | Registered | 2008 |
| COMPCORP 0700031 · TMA412664 | Canadian Life and Health Insurance Compensation Corporation Sociéte Canadienne D'indemnisation Pour Les Assurances De Personnes | 36 Finance | Registered | 1993 |
| CAMPUSCARE 1210032 · TMA633104 | Campus Management Corp, a legal entity | 42 Science | Registered | 2005 |
| CAMPUSCARE 1182568 · TMA659128 | CANAM INSURANCE SERVICES (2018) LIMITED | 36 Finance | Registered | 2006 |
| COMPUSCALE 0452747 · TMA251049 | Siemens Milltronics Process Instruments Inc. | 7 Machines9 Electronics | Registered | 1980 |
| CONFYCARE 1824117 · TMA1000059 · design | HUANGSHAN JINFU MEDICAL EQUIPMENT CO. LTD | 10 Medical | Registered | 2018 |
| CONVOCARE 1810062 · TMA1054898 | CONVOTHERM Elektrogeräte GmbH | 1 Chemicals3 Cosmetics | Registered | 2019 |
| COMPOSURE 1439841 · TMA778135 | an individual | 10 Medical | Registered | 2010 |
| COMPUSAFE 0820166 · TMA514766 | Brink's Network, Incorporated (a Delaware Corporation) | 36 Finance38 Telecommunications | Registered | 1999 |
| COMPUSAFE 0801137 · TMA514768 | Brink's Network, Incorporated (a Delaware Corporation) | 6 Metal | Registered | 1999 |
| CONVACARE 0728164 · TMA458265 | ConvaTec Inc. | 3 Cosmetics | Registered | 1996 |
| COMBOCORE 2344758 | Owner not listed | 42 Science | Pending | 2024 |
| COMPOSURE 2282551 | FoodScience, LLC | 5 Pharmaceuticals | Pending | 2023 |
| ComboCard 0907635 | HER MAJESTY THE QUEEN IN RIGHT OF ONTARIO AS REPRESENTED BY THE MINISTRY OF TRANSPORTATION | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 1995 |
| COMPOSECURE 1990732 · TMA1100416 | an individual | 9 Electronics16 Paper40 Treatment+1 | Registered | 2021 |
| COMPOSICORE 1362564 · TMA833419 | Barrette Outdoor Living, Inc | 19 Building | Registered | 2012 |
| COMPACTPREP 1280762 · TMA717179 | QIAGEN GMBH | 1 Chemicals5 Pharmaceuticals9 Electronics | Registered | 2008 |
| COMPUCENTRE 0448959 · TMA249950 | SYSTÈMES TMN INC. | 7 Machines8 Hand9 Electronics+10 | Registered | 1980 |
| COMPASS 2156252 · TMA1207802 | Stoneage, Inc. | 7 Machines | Registered | 2023 |
| COMPAC 2046827 · TMA1188130 · design | Owner not shown | 7 Machines | Registered | 2023 |
| COMPASS 2046684 · TMA1141373 · design | American Society for Testing and Materials | 41 Education42 Science | Registered | 2022 |
| COMPASS 1900867 · TMA1112795 · design | Boehringer Ingelheim Vetmedica GmbH | 9 Electronics35 Advertising44 Medical | Registered | 2021 |
| COMPASS 1860706 · TMA1081397 · design | The Procter & Gamble Company | 41 Education | Registered | 2020 |