| COOLOGIN 2240421 · TMA1261502 · design | Shenzhen vsann Technology Co. Ltd | 6 Metal8 Hand | Registered | 2024 |
| Cellgin 1643919 · TMA943536 | an individual | 5 Pharmaceuticals | Registered | 2016 |
| COLSON 1151287 · TMA609069 | Colson Caster, LLC | 6 Metal20 Furniture | Registered | 2004 |
| COLSON 0569035 · TMA338513 · design | Owner not shown | 6 Metal | Registered | 1988 |
| CALGON 0341804 · TMA183043 | CALGON LLC | 3 Cosmetics5 Pharmaceuticals | Registered | 1972 |
| CALGON 0162962 · UCA1708 | CALGON LLC | 1 Chemicals | Registered | 1933 |
| COLHYGEN 1864652 · TMA1064695 | an individual | 5 Pharmaceuticals | Registered | 2019 |
| COLLGENE 2269266 · design | Owner not listed | 3 Cosmetics5 Pharmaceuticals35 Advertising | Pending | 2023 |
| Coolzon 2110286 · TMA1179251 | Shenzhen Kuyu Development Company Limited | 24 Textiles | Registered | 2023 |
| CELGENE 2012677 · TMA1114146 | Celgene Corporation | 1 Chemicals5 Pharmaceuticals9 Electronics+2 | Registered | 2021 |
| COLISUN 1980002 · TMA1124249 · design | Colisun (shenzhen) Technology Co. Ltd. | 21 Housewares | Registered | 2022 |
| CLOSKIN 1843265 · TMA1020994 · design | KUNSHAN TENGFEI UNDERWEAR TECHNOLOGY CO. LTD. | 24 Textiles25 Clothing35 Advertising | Registered | 2019 |
| Cologne 1510154 · TMA810408 | Unison Hardware, Inc. | 6 Metal20 Furniture35 Advertising | Registered | 2011 |
| CELGENE 1113182 · TMA630781 | Celgene Corporation, a Delaware corporation | 5 Pharmaceuticals40 Treatment42 Science | Registered | 2005 |
| COLLUSION 1893526 · TMA1114432 | EIGHT PAW PROJECTS LIMITED | 3 Cosmetics9 Electronics14 Jewellery+5 | Registered | 2021 |
| COLLISION 1799268 · TMA1051894 | Unilever Canada Inc. | 3 Cosmetics | Registered | 2019 |
| COOLISION 1504288 · TMA862838 · design | Owner not shown | 29 Meat30 Coffee | Registered | 2013 |
| COLLAGENC 1493579 · TMA813126 | Skinergistics Clinical Skin Solutions Inc. | 3 Cosmetics | Registered | 2011 |
| COALISION 1152857 · TMA606522 | Lolë Brands Canada ULC | 9 Electronics18 Leather25 Clothing+4 | Registered | 2004 |
| COLLEGIUM 0588651 · TMA385819 | an individual | 9 Electronics16 Paper | Registered | 1991 |
| COLLISION 2271957 | Owner not listed | 41 Education | Pending | 2023 |
| COLLISION 2076677 · design | Manders Terrace Ltd | 35 Advertising41 Education | Pending | 2021 |
| CLOAKINE 2223262 · TMA1244491 | REGENERON PHARMACEUTICALS, INC. | 42 Science | Registered | 2024 |
| CLIGANIC 2189489 · TMA1261263 | A to Z Beauty, LLC | 3 Cosmetics5 Pharmaceuticals | Registered | 2024 |
| CLIGANIC 2188317 · TMA1261258 | A to Z Beauty, LLC | 3 Cosmetics8 Hand | Registered | 2024 |