| COOLNET 0780280 · TMA462682 | CANADIAN CONSTRUCTION ASSOCIATION | 38 Telecommunications42 Science | Registered | 1996 |
| COLMET 1930420 · TMA1122752 | Collier Metal Specialties, Ltd. | 6 Metal16 Paper21 Housewares | Registered | 2022 |
| CELNAT 1064214 · TMA586840 · design | an individual | 3 Cosmetics29 Meat30 Coffee | Registered | 2003 |
| CALIENT 1076965 · TMA638039 | CALIENT NETWORKS, INC. a legal entity | 9 Electronics16 Paper | Registered | 2005 |
| CALUMET 0990424 · NFLD424 | WESTMINSTER TOBACCO CO. LIMITED | 34 Tobacco | Registered | 1912 |
| CLEANDELL 2259107 · TMA1281076 · design | Anhui Clean Dell Smart Home Co. Ltd. | 6 Metal11 Lighting | Registered | 2025 |
| Clientime 2250587 · TMA1268850 | an individual | 35 Advertising42 Science | Registered | 2024 |
| Calendria 2240691 · TMA1260073 | CALENDRIA INC | 41 Education | Registered | 2024 |
| CLEANTECH 2218497 · TMA1238967 | Monahan Products LLC | 12 Vehicles | Registered | 2024 |
| CALANTHE 2200012 · TMA1182083 | MASCO CANADA LIMITED | 11 Lighting | Registered | 2023 |
| CalMyotis 2197157 · TMA1237349 | Shenzhen Chuangying Technology Trading Co. Ltd. | 20 Furniture | Registered | 2024 |
| CLIMATELINE 2196480 · TMA1282767 | CLIMATE COATING LIMITED | 19 Building | Registered | 2025 |
| COLONNADE 2181779 · TMA1178041 | MARK ANTHONY GROUP INC. | 33 Wine | Registered | 2023 |
| CLIMATE8 2172016 · TMA1221590 | Climate 8 Holdings Ltd. | 36 Finance42 Science44 Medical | Registered | 2024 |
| CLIMATE 8 2172004 · TMA1221588 | Climate 8 Holdings Ltd. | 36 Finance42 Science44 Medical | Registered | 2024 |
| Celluniti 2162337 · TMA1261129 | an individual | 40 Treatment42 Science45 Legal | Registered | 2024 |
| CLIMATEPROTECT 2159969 · TMA1241091 · design | General Logistics SystemsGermany GmbH & Co. OHG | 39 Transport | Registered | 2024 |
| CLIMATEOS 2150902 · TMA1259329 | an individual | 42 Science | Registered | 2024 |
| COOLMATIC 2148420 · TMA1217270 | Ciele Athletics Inc. | 25 Clothing | Registered | 2024 |
| CleanTrace 2147108 · TMA1262648 | 13104133 Canada Ltd. | 2 Paints6 Metal9 Electronics+3 | Registered | 2024 |
| CellIntense 2143326 · TMA1231094 | LIDL STIFTUNG & CO. KG | 3 Cosmetics5 Pharmaceuticals | Registered | 2024 |
| CALENDLY 2132309 · TMA1175210 · design | Calendly, LLC | 9 Electronics42 Science | Registered | 2023 |
| CLIMATELINEAIR 2131186 · TMA1214171 | RESMED PTY LTD | 10 Medical | Registered | 2023 |
| COOLMATE 2117311 · TMA1195553 | IGLOO PRODUCTS CORP. | 21 Housewares | Registered | 2023 |
| CLIMATTE 2108949 · TMA1261013 | Aritzia LP | 24 Textiles25 Clothing | Registered | 2024 |