| ONECLICK 1827013 · TMA1037708 | Oneclick License, LLC | 9 Electronics12 Vehicles14 Jewellery+3 | Registered | 2019 |
| ONECLICK 1822304 · TMA1037755 | Oneclick License, LLC | 37 Construction42 Science | Registered | 2019 |
| ONECLICK 2130514 · design | O'Neil Digital Solutions, LLC (a California limited liability company) | 42 Science | Pending | 2021 |
| ONECLICK 2130507 | O'Neil Digital Solutions, LLC (a California limited liability company) | 42 Science | Pending | 2021 |
| OMNICLICK 1774842 · TMA1051591 | an individual | 5 Pharmaceuticals9 Electronics10 Medical | Registered | 2019 |
| OneClass 1636264 · TMA886076 | Notesolution Inc. | 9 Electronics | Registered | 2014 |
| ONECLEAN 1360203 · TMA748193 | Owner not shown | 3 Cosmetics | Registered | 2009 |
| ONCOLINK 1292243 · TMA688903 | THE TRUSTEES OF THE UNIVERSITY OF PENNSYLVANIA | 16 Paper41 Education44 Medical | Registered | 2007 |
| ONECLOUD 2298228 | an individual | 9 Electronics | Pending | 2023 |
| OneCloud 2272235 | an individual | 38 Telecommunications | Pending | 2023 |
| OmniGLYZOR 2229893 · TMA1245649 | an individual | 1 Chemicals5 Pharmaceuticals | Registered | 2024 |
| ONIGAL 2131264 · TMA1193766 · design | Shenzhen Zhongxin Jiahe Electronic Technology Development Co.Ltd | 9 Electronics35 Advertising | Registered | 2023 |
| OnceWill 2110551 · TMA1182777 | OnceWill LLC | 14 Jewellery | Registered | 2023 |
| Onglory 2099357 · TMA1175790 | an individual | 11 Lighting | Registered | 2023 |
| oneisall 2080027 · TMA1165923 | Shenzhen Shouzheng Chuqi Electronic Commerce Co. Ltd. | 8 Hand | Registered | 2023 |
| ONECLICKUPSELL 2059123 · TMA1131243 | Zipify, LLC | 42 Science | Registered | 2022 |
| Omegle 2045513 · TMA1124496 | OMEGLE.COM LLC | 38 Telecommunications | Registered | 2022 |
| OMEGALIF 1980790 · TMA1245957 | Spinal Elements, Inc. | 10 Medical | Registered | 2024 |
| ONESEAL 1947503 · TMA1206844 | an individual | 6 Metal | Registered | 2023 |
| ONEGOLD 1916991 · TMA1093816 | ONEGOLD Inc. | 36 Finance | Registered | 2021 |
| ONECELL 1899601 · TMA1103704 | CommScope Technologies LLC | 9 Electronics | Registered | 2021 |
| ONECAL 1892035 · TMA1098593 | Fluke Corporation | 9 Electronics42 Science | Registered | 2021 |
| ONESOLUTION 1880594 · TMA1078238 | Owner not shown | 44 Medical | Registered | 2020 |
| ONKALO 1872570 · TMA1087150 | an individual | 6 Metal7 Machines9 Electronics+7 | Registered | 2020 |
| ONESEAL 1865711 · TMA1090391 | Tremco CPG Inc. | 2 Paints | Registered | 2020 |