| COGLEKA 2066927 · TMA1133435 | Eisai R&D Management Co. Ltd. | 5 Pharmaceuticals | Registered | 2022 |
| COSLYS 1829969 · TMA1097667 · design | Owner not shown | 3 Cosmetics | Registered | 2021 |
| COSLYS 1678094 · TMA945216 · design | an individual | 3 Cosmetics5 Pharmaceuticals | Registered | 2016 |
| CUSALES 1242774 · TMA718619 | Canadian Credit Union Association Cooperative | 35 Advertising | Registered | 2008 |
| CEGELEC 0644916 · TMA394111 | an individual | 9 Electronics35 Advertising37 Construction+1 | Registered | 1992 |
| CEGELEC 0278301 · TMA148183 | Owner not shown | 6 Metal7 Machines8 Hand+4 | Registered | 1966 |
| COSLUS 2370582 | Owner not listed | 8 Hand10 Medical21 Housewares | Pending | 2024 |
| COSLUS 2320130 · design | Lancdon Jeshua Inc | 8 Hand10 Medical21 Housewares | Pending | 2024 |
| COUGHGELS 1247365 · TMA707770 | PF Consumer Healthcare Canada ULC | 5 Pharmaceuticals | Registered | 2008 |
| cycleacc 2263090 · TMA1283211 | Geek Union Ee-commerce Co. LTD | 28 Toys | Registered | 2025 |
| COCOLOCO 2236783 · TMA1253098 · design | an individual | 4 Oils34 Tobacco | Registered | 2024 |
| CYCLUS 2217118 · TMA1231797 · design | Cyclus Steam & Power, LLC | 40 Treatment | Registered | 2024 |
| CYCLUS 2211220 · TMA1231736 | Cyclus Steam & Power, LLC | 40 Treatment | Registered | 2024 |
| CIGLIKES 2206759 · TMA1241447 · design | HUIZHOU HAPPY VAPING TECHNOLOGY LIMITED | 34 Tobacco | Registered | 2024 |
| CYCLISTS 2093913 · TMA1207204 · design | YE CHOU INDUSTRY CO. LTD. | 8 Hand | Registered | 2023 |
| COOKIELICIOUS 2084911 · TMA1182643 | D SPOT Franchising Inc. | 30 Coffee43 Restaurants | Registered | 2023 |
| Cocoalicious 2070419 · TMA1159326 | an individual | 29 Meat30 Coffee | Registered | 2023 |
| cyclace 2069033 · TMA1158313 | Yongkang Qiaofei Trading Co. Ltd. | 28 Toys | Registered | 2022 |
| CYCLESYNC 2056009 · TMA1196396 | an individual | 3 Cosmetics | Registered | 2023 |
| CYCLESMART 2022567 · TMA1158029 | Jamieson Laboratories Ltd. | 5 Pharmaceuticals | Registered | 2022 |
| CYCLIC 1991971 · TMA1101238 | Waters Technologies Corporation | 9 Electronics | Registered | 2021 |
| CHOICEOLOGY 1898726 · TMA1093084 | CHARLES SCHWAB & CO. INC. | 9 Electronics41 Education | Registered | 2021 |
| CYCOLOGY 1882251 · TMA1070671 · design | Cycology Holdings Pty Limited | 25 Clothing | Registered | 2020 |
| CYCOLOGY 1882250 · TMA1070667 | Cycology Holdings Pty Limited | 25 Clothing | Registered | 2020 |
| CHOCOHOLIC 1878507 · TMA1078108 | Noxell Corporation | 3 Cosmetics | Registered | 2020 |