| COLOMEAL 2171667 · TMA1206603 | CRITERIO | 5 Pharmaceuticals | Registered | 2023 |
| COLUMELA 1034750 · TMA554737 | an individual | 29 Meat | Registered | 2001 |
| COOLMOULD 1834743 · TMA1010242 | an individual | 6 Metal | Registered | 2018 |
| CLANLANDS 2267099 · TMA1111315 | Great Glen Company, LLC | 41 Education | Registered | 2021 |
| CLEANMILL 2247508 · TMA1263276 | Owner not listed | 9 Electronics | Registered | 2024 |
| CHJGLNL 2201133 · TMA1238646 · design | Shenzhen Nuoan Technology Co., Ltd. | 18 Leather | Registered | 2024 |
| COLLANOL 2133759 · TMA1226873 · design | VITASLIM INNOVE Ltd | 5 Pharmaceuticals | Registered | 2024 |
| CALMOLINE 2133632 · TMA1266771 | an individual | 3 Cosmetics5 Pharmaceuticals | Registered | 2024 |
| CLAMLOCK 2129104 · TMA1190949 | Clam Corporation | 19 Building28 Toys | Registered | 2023 |
| CLEANLI 2065994 · TMA1280208 | BUSCH SYSTEMS INTERNATIONAL INC. | 6 Metal20 Furniture | Registered | 2025 |
| CLANLANDS 2036192 · TMA1112099 | Great Glen Company, LLC | 16 Paper | Registered | 2021 |
| CLEANLEAF 2017259 · TMA1129894 · design | Owner not shown | 31 Fresh | Registered | 2022 |
| CALIMALA 1886872 · TMA1080304 | an individual | 3 Cosmetics | Registered | 2020 |
| CELANYL 1854049 · TMA1101298 | CELANESE INTERNATIONAL CORPORATION | 1 Chemicals17 Rubber | Registered | 2021 |
| COLUMNLIFT 1817417 · TMA1010450 | Maxon Industries, Inc. dba Maxon Lift Corp. | 7 Machines12 Vehicles | Registered | 2018 |
| COLLONIL 1815683 · TMA1064618 | Salzenbrodt GmbH & Co. KG, a legal entity | 1 Chemicals3 Cosmetics4 Oils+4 | Registered | 2019 |
| CLYNOL 1794502 · TMA1041153 | Henkel AG & Co. KGaA | 3 Cosmetics | Registered | 2019 |
| COLINEAL 1538111 · TMA884618 · design | Colineal Corporation Cia. Ltda. | 20 Furniture35 Advertising | Registered | 2014 |
| COLONYLINK 1528593 · TMA865288 | GrainFox Corp. | 35 Advertising | Registered | 2013 |
| CLIMALOFT 1458188 · TMA803490 | SI-Products, LLC | 24 Textiles | Registered | 2011 |
| CLINILOG 1403379 · TMA758608 | Owner not shown | 16 Paper | Registered | 2010 |
| CLEANWELL 1378893 · TMA869120 | CleanWell, LLC | 3 Cosmetics5 Pharmaceuticals21 Housewares | Registered | 2014 |
| CULINOLOGY 1323221 · TMA735667 | Research Chefs Association | 35 Advertising41 Education43 Restaurants+1 | Registered | 2009 |
| CLINOLEIC 1275764 · TMA680374 | BAXTER INTERNATIONAL INC. | 5 Pharmaceuticals | Registered | 2007 |
| CLEANWELL 1192106 · TMA675218 | Owner not shown | 2 Paints4 Oils6 Metal+3 | Registered | 2006 |