| ONECARE 1350004 · TMA787513 | Bradshaw Canada Holdings, Inc. | 3 Cosmetics20 Furniture21 Housewares+1 | Registered | 2011 |
| ONECARE 2348969 | Owner not listed | 42 Science | Pending | 2024 |
| Onecare 2329041 | Owner not listed | 42 Science | Pending | 2024 |
| ONESOURCE 1909962 · TMA1114734 | PerkinElmer U.S. LLC | 35 Advertising37 Construction41 Education+2 | Registered | 2021 |
| ONESCORE 1772553 · TMA1057056 | Global Wireless Solutions, Inc. | 9 Electronics16 Paper35 Advertising+1 | Registered | 2019 |
| OnCare 1692328 · TMA1041545 | Voith Patent GmbH | 9 Electronics35 Advertising37 Construction+2 | Registered | 2019 |
| ONESOURCE 1663074 · TMA944059 | OneSource Facility Services, Inc. | 35 Advertising37 Construction40 Treatment+2 | Registered | 2016 |
| ONESOURCE 1365431 · TMA780655 | Federal-Mogul LLC | 7 Machines12 Vehicles | Registered | 2010 |
| ONESOURCE 0856253 · TMA544560 | IVP, LLC | 5 Pharmaceuticals | Registered | 2001 |
| ONECARD 2347756 · design | Athbhreith Pty Ltd | 9 Electronics35 Advertising41 Education+1 | Pending | 2024 |
| ONECARD 2130513 | O'Neil Digital Solutions, LLC (a California limited liability company) | 42 Science | Pending | 2021 |
| ONECARD 2130512 · design | O'Neil Digital Solutions, LLC (a California limited liability company) | 42 Science | Pending | 2021 |
| Onecarworld 2358193 | Owner not listed | 12 Vehicles | Pending | 2024 |
| ONASAR 2175795 · TMA1226251 | Shenzhen Yibo Electronic Commerce Co. Ltd. | 27 Carpets | Registered | 2024 |
| OMNICORE 2164076 · TMA1197174 | IW Apparel, LLC | 9 Electronics | Registered | 2023 |
| ONCUR 2103275 · TMA1211836 · design | Shanghai Qiran Biological Technology Co. Ltd. | 3 Cosmetics | Registered | 2023 |
| onegrus 2101695 · TMA1175818 | Shenzhen Tomtoc technology Co. Ltd. | 9 Electronics18 Leather20 Furniture | Registered | 2023 |
| ONESEARCH 2099904 · TMA1154377 · design | Yahoo Inc. | 42 Science | Registered | 2022 |
| OMNISHARE 2081245 · TMA1150612 | Market Track, LLC | 9 Electronics35 Advertising42 Science | Registered | 2022 |
| OMOSHIROI 2077332 · TMA1178877 | TRIAD Inc. | 16 Paper | Registered | 2023 |
| ONCXERNA 2069939 · TMA1210542 · design | OncXerna Therapeutics, Inc. | 1 Chemicals5 Pharmaceuticals42 Science | Registered | 2023 |
| ONCXERNA 2063453 · TMA1209408 | OncXerna Therapeutics, Inc. | 1 Chemicals5 Pharmaceuticals42 Science | Registered | 2023 |
| OmiCure 2042617 · TMA1156217 | OMICURE | 9 Electronics35 Advertising38 Telecommunications+3 | Registered | 2022 |
| ONAZRY 2035293 · TMA1141288 | Onazry LLC | 35 Advertising | Registered | 2022 |
| ONCRUZO 2019683 · TMA1115076 | Celgene Corporation | 5 Pharmaceuticals | Registered | 2021 |