| cycleacc 2263090 · TMA1283211 | Geek Union Ee-commerce Co. LTD | 28 Toys | Registered | 2025 |
| CYCLEZONE 1680687 · TMA986571 | URBAN SYSTEMS LTD. | 9 Electronics16 Paper35 Advertising+1 | Registered | 2017 |
| CYCLESURE 1000488 · TMA556102 | ASP Global Manufacturing GmbH | 1 Chemicals5 Pharmaceuticals9 Electronics | Registered | 2002 |
| CycleStim 2317787 | TERRALOG TECHNOLOGIES INC. | 37 Construction42 Science | Pending | 2024 |
| CYCLESMART 2022567 · TMA1158029 | Jamieson Laboratories Ltd. | 5 Pharmaceuticals | Registered | 2022 |
| CYCLECHECK 1782736 · TMA1005188 | GTA Guns and Gear Auctions Inc. | 42 Science | Registered | 2018 |
| CYCLESMART 1456214 · TMA791169 | URBAN SYSTEMS LTD. | 9 Electronics16 Paper35 Advertising+1 | Registered | 2011 |
| CYCLUS 2217118 · TMA1231797 · design | Cyclus Steam & Power, LLC | 40 Treatment | Registered | 2024 |
| CYCLUS 2211220 · TMA1231736 | Cyclus Steam & Power, LLC | 40 Treatment | Registered | 2024 |
| CYCLISTS 2093913 · TMA1207204 · design | YE CHOU INDUSTRY CO. LTD. | 8 Hand | Registered | 2023 |
| CYCLIC 1991971 · TMA1101238 | Waters Technologies Corporation | 9 Electronics | Registered | 2021 |
| CYCLAS 1765766 · TMA1005486 | YOUR SANCTUARY Co. Ltd. | 18 Leather25 Clothing | Registered | 2018 |
| CYCLEGRIP 1527159 · TMA896511 | ENNIS-FLINT, INC. | 2 Paints | Registered | 2015 |
| CYCLOSET 1474257 · TMA887361 | VeroScience LLC | 5 Pharmaceuticals | Registered | 2014 |
| CYCLOGEN 0441220 · TMA243490 | TRICOR REFINING, LLC (a California Limited Liability Company) | 1 Chemicals | Registered | 1980 |
| CYCLOGYL 0222598 · UCA48445 | Alcon Inc. | 5 Pharmaceuticals | Registered | 1953 |
| Cyclus 2338920 | Sartorius Lab Instruments GmbH & Co. KG | 1 Chemicals5 Pharmaceuticals | Pending | 2024 |
| CYCLECANADA 1033695 · TMA570280 | Cycle Canada, The Veloforce Corporation | 16 Paper25 Clothing39 Transport+1 | Registered | 2002 |
| CYCLESHIELD 2128917 | CORNELLCOOKSON, LLC | 2 Paints | Pending | 2021 |
| COCOLOCO 2236783 · TMA1253098 · design | an individual | 4 Oils34 Tobacco | Registered | 2024 |
| CIGLIKES 2206759 · TMA1241447 · design | HUIZHOU HAPPY VAPING TECHNOLOGY LIMITED | 34 Tobacco | Registered | 2024 |
| COOKIELICIOUS 2084911 · TMA1182643 | D SPOT Franchising Inc. | 30 Coffee43 Restaurants | Registered | 2023 |
| Cocoalicious 2070419 · TMA1159326 | an individual | 29 Meat30 Coffee | Registered | 2023 |
| cyclace 2069033 · TMA1158313 | Yongkang Qiaofei Trading Co. Ltd. | 28 Toys | Registered | 2022 |
| COGLEKA 2066927 · TMA1133435 | Eisai R&D Management Co. Ltd. | 5 Pharmaceuticals | Registered | 2022 |