| CONDOCHECK 1296189 · TMA716153 · design | Condominium Support Services Inc. | 36 Finance | Registered | 2008 |
| CONDECO 1808376 · TMA1039142 | CONDECO GROUP LIMITED | 9 Electronics16 Paper41 Education+2 | Registered | 2019 |
| CONDUCRETE 0877266 · TMA514346 · design | SHORE ACRES ENTERPRISES INC. | 1 Chemicals9 Electronics42 Science | Registered | 1999 |
| CONDUCRETE 2036954 | SHORE ACRES ENTERPRISES INC. | 1 Chemicals37 Construction42 Science | Pending | 2020 |
| CONTEC 1948626 · TMA1148335 · design | CONTEC MEDICAL SYSTEMS CO. LTD. | 10 Medical | Registered | 2022 |
| CONTECH 1806549 · TMA1012240 | an individual | 37 Construction | Registered | 2019 |
| CONDUCT 1806515 · TMA1027394 · design | Giant Manufacturing Co. Ltd. | 12 Vehicles | Registered | 2019 |
| CONDICO 1774231 · TMA964764 | an individual | 35 Advertising45 Legal | Registered | 2017 |
| COINDESK 1673991 · TMA970787 | COINDESK, INC. | 35 Advertising36 Finance41 Education | Registered | 2017 |
| CONTACK 1628926 · TMA908471 | GESTION IMMOBILIÈRE GT INC. | 19 Building | Registered | 2015 |
| CONDICI 1620145 · TMA931950 · design | Condici Limited | 25 Clothing | Registered | 2016 |
| CONTEC 1366039 · TMA745544 | NUTRIEN (CANADA) HOLDINGS ULC | 1 Chemicals | Registered | 2009 |
| CONTEC 1343357 · TMA747099 | NRW Anlagentechnik GmbH | 7 Machines11 Lighting | Registered | 2009 |
| CONTEC 0772189 · TMA456842 · design | CONTEC CO. LTD. | 5 Pharmaceuticals9 Electronics | Registered | 1996 |
| CANDOCK 0750259 · TMA443085 | CANDOCK INC. | 6 Metal19 Building | Registered | 1995 |
| CENDEC 0743871 · TMA463356 | Cendec Systems Inc. | 9 Electronics | Registered | 1996 |
| CONDUCTEX 0395823 · TMA224853 | BIRLA CARBON U.S.A. INC. | 1 Chemicals | Registered | 1977 |
| CIMETECH 2256049 · TMA1237812 | Groupe Gestion Onsteel Inc. | 37 Construction42 Science | Registered | 2024 |
| CONTACKGLUE 2224764 · TMA1250115 · design | HIGH PERFORMANCE MANUFACTURING, LLC. | 1 Chemicals | Registered | 2024 |
| CONTIGO 2223537 · TMA1256475 | The Coleman Company, Inc. | 21 Housewares | Registered | 2024 |
| CEMOTOCN 2214353 · TMA1244390 | CEMOTO LTD | 12 Vehicles | Registered | 2024 |
| CONTESSA 2189867 · TMA1233644 | THOR TECH, INC. | 12 Vehicles | Registered | 2024 |
| CanaTech 2185774 · TMA1231507 | GTA Sign Depot Inc | 7 Machines | Registered | 2024 |
| CentiSpace 2176227 · TMA1280662 | Beijing Future Navigation Technology Co. Ltd. | 39 Transport | Registered | 2025 |
| CANDEX 2158182 · TMA1193954 | Dexx Technologies, Inc. | 42 Science | Registered | 2023 |