| COMPATILUS 1906989 · TMA1120521 | AIRNOV, INC. | 37 Construction40 Treatment42 Science | Registered | 2022 |
| COMPETITION 1403301 · TMA757179 | an individual | 31 Fresh | Registered | 2010 |
| COMPETITION 0469684 · TMA285505 | an individual | 9 Electronics | Registered | 1983 |
| COMPETITION 0390648 · TMA216197 | FGL Sports Ltd. | 25 Clothing | Registered | 1976 |
| COMPUTERWORLD 1576615 · TMA851315 | INTERNATIONAL DATA GROUP, INC. | 42 Science | Registered | 2013 |
| COMPETIVISION 0879871 · TMA518029 | Bollé Brands Inc. | 9 Electronics | Registered | 1999 |
| COMPUTERWORLD 0424946 · TMA235747 | INTERNATIONAL DATA GROUP, INC. (ALSO TRADING AS INTERNATIONAL DATA GROUP AND AS IDG), A MASSACHUSETTS CORPORATION | 16 Paper | Registered | 1979 |
| COMPUTERWORLD 2155126 | INTERNATIONAL DATA GROUP, INC. | 35 Advertising38 Telecommunications42 Science | Pending | 2021 |
| canupdog 2342487 · TMA1285099 | Shenzhen Honghelong Trading Co. Ltd. | 9 Electronics | Registered | 2025 |
| compuda 2260731 · TMA1279509 | Guangzhou Bafubali Import and Export Trade Co. Ltd. | 18 Leather | Registered | 2024 |
| CHAINPATROL 2249312 · TMA1268660 | Owner not listed | 9 Electronics42 Science | Registered | 2024 |
| Cinpode 2227040 · TMA1252624 | Shenzhen Hongming Innovation Co. Ltd. | 18 Leather | Registered | 2024 |
| CANFITCAN 2217310 · TMA1246689 | Guangdong Xizhongxi Technology Co.,Ltd. | 9 Electronics12 Vehicles | Registered | 2024 |
| CONFETTI 2183279 · TMA1207954 | Crayola Properties, Inc. | 16 Paper | Registered | 2023 |
| COMFYTEMP 2156455 · TMA1214419 · design | Shenzhen Yicai Network Technology Co. Ltd | 11 Lighting | Registered | 2023 |
| CAMPETELLA 2136874 · TMA1205086 · design | CAMPETELLA ROBOTIC CENTER S.R.L. | 7 Machines | Registered | 2023 |
| CYMBIOTIKA 2136814 · TMA1236975 | Cymbiotika, LLC | 5 Pharmaceuticals | Registered | 2024 |
| ConFitDance 2100530 · TMA1173815 | an individual | 41 Education | Registered | 2023 |
| CONFIDIAN 2090830 · TMA1191596 | Roche Diabetes Care GmbH | 9 Electronics10 Medical42 Science | Registered | 2023 |
| Camptrace 2074459 · TMA1161456 | Nanjing Yanjiayu Trading Co. Ltd. | 25 Clothing | Registered | 2023 |
| CONFIDENT? 2051995 · TMA1215896 | CONFIDENT GAMES Limited | 9 Electronics28 Toys41 Education | Registered | 2023 |
| CMFT 2049217 · TMA1166731 · design | an individual | 16 Paper25 Clothing | Registered | 2023 |
| Canvita 2046368 · TMA1215882 | Canvita Canada ltd | 5 Pharmaceuticals | Registered | 2023 |
| CO2NFIDENCE 2025491 · TMA1115467 | CalPortland Company | 19 Building40 Treatment42 Science | Registered | 2021 |
| COMBAT 2022829 · TMA1134909 | LIG GmbH | 7 Machines | Registered | 2022 |