| CLOUDSTACK 1555486 · TMA942169 | The Apache Software Foundation (a Delaware corporation) | 9 Electronics42 Science | Registered | 2016 |
| CLOUDSPHERE 2353191 | CLOUDSPHERE BIOTECHNOLOGY CORPORATION | 5 Pharmaceuticals | Pending | 2024 |
| CLOUDSCAPE 2240171 · TMA1257003 | Amazon Technologies, Inc. | 42 Science | Registered | 2024 |
| Cloudystar 2140702 · TMA1200291 | an individual | 11 Lighting | Registered | 2023 |
| CLOUDSLANG 1739070 · TMA967777 | EntIT Software LLC | 9 Electronics | Registered | 2017 |
| CLOUDSPEED 1715374 · TMA952965 | SanDisk LLC | 42 Science | Registered | 2016 |
| CLOUDSPEED 1715373 · TMA952966 | SanDisk LLC | 9 Electronics35 Advertising37 Construction+1 | Registered | 2016 |
| CLOUDSPRAY 1688757 · TMA978680 | BitSpray Holding Corporation | 42 Science | Registered | 2017 |
| CLOUDHAWK 1673401 · TMA960119 | DBJay Ltd. | 9 Electronics35 Advertising42 Science | Registered | 2017 |
| CLOUDSPEED 1665021 · TMA963841 · design | SanDisk LLC | 9 Electronics | Registered | 2017 |
| CLOUDSTOR 1571989 · TMA856654 · design | BUFFALO INC. | 9 Electronics | Registered | 2013 |
| Cloudspike 2312827 | On Clouds GmbH | 25 Clothing | Pending | 2023 |
| CloudStage 2277127 | GPU Audio Inc. | 42 Science | Pending | 2023 |
| CLOUDSTRATA 2237993 | Washgesh Holdings Inc. | 42 Science | Pending | 2023 |
| CLOUDSTEPPERS 1835005 · TMA1046500 | C. & J. CLARK INTERNATIONAL LIMITED | 25 Clothing | Registered | 2019 |
| CLOUDSOFT 2259722 · TMA1277935 | Kimberly-Clark Worldwide, Inc. | 5 Pharmaceuticals | Registered | 2024 |
| Coldstar 2199766 · TMA1237612 | Xiamen Xinjiefeng Trading Co., Ltd. | 25 Clothing | Registered | 2024 |
| Cloudeasy 2188015 · TMA1272599 | On Clouds GmbH | 25 Clothing28 Toys42 Science | Registered | 2024 |
| CLOUDSHELL 2136404 · TMA1213150 | TENTREE INTERNATIONAL INC. | 25 Clothing | Registered | 2023 |
| CLOUDSMITH 2106884 · TMA1224277 | Cloudsmith Ltd | 42 Science | Registered | 2024 |
| Cloudcraft 2055150 · TMA1129345 | Cloudcraft Inc | 42 Science | Registered | 2022 |
| CloudGram 2023897 · TMA1188087 | CloudGram Corporation | 9 Electronics35 Advertising38 Telecommunications+3 | Registered | 2023 |
| CLOUDSCENE 2017244 · TMA1210423 | Cloudscene (Services) Pty Limited | 35 Advertising38 Telecommunications42 Science | Registered | 2023 |
| CloudScent 1996210 · TMA1125078 | Vivid Theory Ltd. | 3 Cosmetics11 Lighting | Registered | 2022 |
| CloudShow 1886329 · TMA1067250 | Binary Fortress Software Ltd. | 42 Science | Registered | 2019 |