| CLEANGOLD 1989525 · TMA1120793 · design | CLEAN MINING LTD | 14 Jewellery37 Construction40 Treatment+1 | Registered | 2022 |
| CYLANCE 1758154 · TMA957656 · design | Cylance Inc. | 9 Electronics42 Science | Registered | 2016 |
| COLUNEX 1679049 · TMA997324 | Owner not shown | 10 Medical20 Furniture24 Textiles | Registered | 2018 |
| CYLANCE 1601126 · TMA919113 | Cylance Inc. | 9 Electronics42 Science | Registered | 2015 |
| COLONEXT 1591400 · TMA892641 | Ambry Genetics Corporation, a Delaware corporation | 1 Chemicals5 Pharmaceuticals35 Advertising+2 | Registered | 2014 |
| CLINGO 1460474 · TMA836359 | CLINGO.COM LLC | 9 Electronics28 Toys | Registered | 2012 |
| CHILANGO 1436181 · TMA789286 | MUCHO MAS LIMITED | 41 Education43 Restaurants | Registered | 2011 |
| COLNAGO 1371516 · TMA812994 · design | an individual | 12 Vehicles25 Clothing | Registered | 2011 |
| COLNAGO 1371510 · TMA812993 | an individual | 12 Vehicles25 Clothing | Registered | 2011 |
| "CLANG" 0993163 · NFLD3163 | CLANG LIMITED | 7 Machines11 Lighting | Registered | 1948 |
| COLNAGO 0870693 · TMA518995 · design | an individual | 9 Electronics12 Vehicles25 Clothing | Registered | 1999 |
| CELANEX 0354495 · TMA190101 | CELANESE INTERNATIONAL CORPORATION (A DELAWARE CORPORATION) | 1 Chemicals16 Paper17 Rubber+1 | Registered | 1973 |
| CELANESE 0109415 · TMDA31144 | CELANESE CANADA INC. | 1 Chemicals2 Paints3 Cosmetics+23 | Registered | 1922 |
| COLNAGO 2283652 · design | an individual | 14 Jewellery | Pending | 2023 |
| CLEANGEN 2070278 | RIC Electronics Ltd. | 9 Electronics40 Treatment | Pending | 2020 |
| COOLANGATTA 1952215 · TMA1107856 | Central Graphics and Container Group Ltd. | 19 Building20 Furniture35 Advertising | Registered | 2021 |
| COLLINGWOOD 1813299 · TMA1103675 | Sazerac Brands, LLC. | 33 Wine | Registered | 2021 |
| CLAYMAKER 2262002 · TMA1281338 | CLAYNOSAURZ INC. | 28 Toys | Registered | 2025 |
| CLAYMAKER 2262000 · TMA1281337 | CLAYNOSAURZ INC. | 9 Electronics35 Advertising41 Education+1 | Registered | 2025 |
| coolmax 2260153 · TMA1277969 | Owner not shown | 34 Tobacco | Registered | 2024 |
| CLENSTELFIO 2249095 · TMA1261944 | Owner not shown | 5 Pharmaceuticals | Registered | 2024 |
| CALONOX 2237128 · TMA1251608 | Owner not listed | 9 Electronics | Registered | 2024 |
| CLAYNOSAURZ 2234825 · TMA1256734 | CLAYNOSAURZ INC. | 9 Electronics21 Housewares25 Clothing+4 | Registered | 2024 |
| CLINCHER 2225755 · TMA1251233 | NORD GEAR LIMITED/ENGRENAGES NORD LIMITEE | 7 Machines | Registered | 2024 |
| CLEANGUARD 2224923 · TMA1250151 | The Procter & Gamble Company | 5 Pharmaceuticals | Registered | 2024 |