| COTCO 1007039 · TMA551905 · design | CreeLED, Inc. | 11 Lighting | Registered | 2001 |
| Cotech 2165068 · TMA1188897 | 9091-4532 Québec inc. | 7 Machines | Registered | 2023 |
| CODDOCK 1973590 · TMA1242138 | Aqua Star (USA), Corp. | 29 Meat | Registered | 2024 |
| CITCO 1740918 · TMA1089111 | THE CITCO GROUP LIMITED | 9 Electronics35 Advertising36 Finance+2 | Registered | 2020 |
| COTECH 1737297 · TMA973392 · design | 9091-4532 Québec inc. | 6 Metal7 Machines12 Vehicles+1 | Registered | 2017 |
| CATECO 1667305 · TMA903532 | CATECO INC. | 21 Housewares | Registered | 2015 |
| CITÉCO 1642513 · TMA984279 · design | Owner not shown | 35 Advertising36 Finance41 Education | Registered | 2017 |
| CITECO 1629072 · TMA984280 | Owner not shown | 35 Advertising41 Education | Registered | 2017 |
| CETCO 1448990 · TMA816046 | AMCOL International Corporation (Delaware corporation) | 1 Chemicals11 Lighting17 Rubber+5 | Registered | 2012 |
| CATCO 1073097 · TMA566087 | AirTek, LLC | 12 Vehicles | Registered | 2002 |
| CETCO 0806215 · TMA509841 | AMCOL INTERNATIONAL CORPORATION | 1 Chemicals5 Pharmaceuticals11 Lighting+3 | Registered | 1999 |
| CITCO 0718095 · TMA428250 · design | THE CITCO GROUP LIMITED | 36 Finance45 Legal | Registered | 1994 |
| CITCO 0667509 · TMA403855 | THE CITCO GROUP LIMITED | 35 Advertising36 Finance | Registered | 1992 |
| CUTCO 0212238 · UCA40388 | CUTCO CORPORATION (A DELAWARE CORPORATION) | 8 Hand16 Paper21 Housewares | Registered | 1951 |
| COATS 2266767 · TMA1270300 | Waldencast UK Limited | 3 Cosmetics | Registered | 2024 |
| CGGOODS 2252257 · TMA1271398 | Suzhou Qianjiayi Trading Co.Ltd. | 26 Sewing | Registered | 2024 |
| CTK 2243802 · TMA1261833 | CTK SYS Inc. | 9 Electronics37 Construction42 Science+1 | Registered | 2024 |
| Cadex 2240499 · TMA1267068 | Cadex Fasteners Ltd. | 7 Machines8 Hand | Registered | 2024 |
| COTES 2231098 · TMA1253028 · design | Owner not shown | 11 Lighting40 Treatment | Registered | 2024 |
| Cotes 2231097 · TMA1253027 | Owner not shown | 11 Lighting40 Treatment | Registered | 2024 |
| CDXX 2184763 · TMA1259490 | an individual | 3 Cosmetics10 Medical16 Paper+7 | Registered | 2024 |
| CYTAC 2163928 · TMA1259388 · design | Cytac Technology Limited | 9 Electronics13 Firearms | Registered | 2024 |
| cottzy 2161651 · TMA1220511 | an individual | 25 Clothing | Registered | 2024 |
| CHUDDYS 2155318 · TMA1207718 | an individual | 30 Coffee | Registered | 2023 |
| Coitak 2153197 · TMA1237033 | Shenzhen Yixin Economic and Trade Co. Ltd. | 24 Textiles | Registered | 2024 |