| COASTLINE 1885002 · TMA1078545 | CPG International LLC | 19 Building | Registered | 2020 |
| COASTLINE 0872615 · TMA545763 | KWV Intellectual Properties (Pty) Limited | 33 Wine | Registered | 2001 |
| CASTLITE 1627457 · TMA938060 | Conair LLC | 21 Housewares | Registered | 2016 |
| CASTLITE 1276643 · TMA720200 | CONSOLIDATED METCO, INC. | 12 Vehicles | Registered | 2008 |
| CASTLON 2295674 | Discovery Purchaser Corporation | 5 Pharmaceuticals | Pending | 2023 |
| COASTALOCK 2113289 · TMA1220372 | ECONCRETE TECH LTD | 19 Building | Registered | 2024 |
| COSTALUNGA 2058366 · TMA1170916 | an individual | 33 Wine | Registered | 2023 |
| CASTELLINI 0702605 · TMA427464 | an individual | 10 Medical | Registered | 1994 |
| CASTALUNA 1809529 · TMA1057511 | LA REDOUTE ( Société par Actions Simplifiée) | 25 Clothing | Registered | 2019 |
| CASTLIGHT 1747514 · TMA1046049 | Grouper Casting, LLC | 40 Treatment42 Science | Registered | 2019 |
| COCKTAILING 1749953 · TMA1057459 | Unilever Global IP Limited | 41 Education44 Medical | Registered | 2019 |
| CASTLEMAINE 0855634 · TMA503438 | WWRD IRELAND IPCO LLC | 21 Housewares | Registered | 1998 |
| CASTLE 2240162 · TMA1257000 · design | Castle Equipment Company, LLC | 12 Vehicles | Registered | 2024 |
| CASTLE 2240161 · TMA1256999 | Castle Equipment Company, LLC | 12 Vehicles | Registered | 2024 |
| CASTLE 2017468 · TMA1157878 · design | Castle Glassworks Inc. | 25 Clothing26 Sewing34 Tobacco+1 | Registered | 2022 |
| CASTLE 1908734 · TMA1208015 · design | Crossroads Christian Communication Inc | 38 Telecommunications | Registered | 2023 |
| CASTLE 1908733 · TMA1208014 | Crossroads Christian Communication Inc | 38 Telecommunications | Registered | 2023 |
| CASTLE 1903154 · TMA1078557 · design | Minhas Sask Ventures Inc | 33 Wine | Registered | 2020 |
| CASTLELAKE 1884124 · TMA1094015 · design | an individual | 36 Finance | Registered | 2021 |
| CASTLELAKE 1884116 · TMA1094014 | an individual | 36 Finance | Registered | 2021 |
| CASTIEL 1864067 · TMA1025430 | ST. REGIS, INC. | 11 Lighting14 Jewellery16 Paper | Registered | 2019 |
| CISTELAIER 1811950 · TMA1082759 · design | Owner not shown | 9 Electronics35 Advertising | Registered | 2020 |
| CASTLEMAIN 1587412 · TMA857832 | The Castlemain Group Inc. | 35 Advertising36 Finance42 Science+1 | Registered | 2013 |
| CASTLE 1476868 · TMA807843 | THE SECRETAN CENTER INC. a legal entity | 9 Electronics16 Paper35 Advertising+3 | Registered | 2011 |
| COSTHELPER 1450003 · TMA825139 | Costhelper, Inc. | 35 Advertising38 Telecommunications | Registered | 2012 |