| ONSHORE 1790356 · TMA1034917 | HUTCHINSON SA | 7 Machines | Registered | 2019 |
| ONCOR 1928801 · TMA1113844 | ONCOR TREE LIMITED | 26 Sewing28 Toys | Registered | 2021 |
| ONCOR 0455136 · TMA253514 | KIKUCHI COLOR & CHEMICALS CORPORATION | 2 Paints | Registered | 1980 |
| ONESCORE 1772553 · TMA1057056 | Global Wireless Solutions, Inc. | 9 Electronics16 Paper35 Advertising+1 | Registered | 2019 |
| ONESORT 1744693 · TMA970751 | DMT Solutions Global Corporation, a Delaware corporation | 9 Electronics | Registered | 2017 |
| OMNISCORE 0806762 · TMA514550 | Genworth Mortgage Holdings, LLC | 36 Finance | Registered | 1999 |
| OMNISHORE 2263982 | an individual | 7 Machines | Pending | 2023 |
| onsoyours 2130271 | Guangzhou Maidong International Trade Co. Ltd. | 20 Furniture28 Toys | Pending | 2021 |
| 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 |
| OMNICURVE 2017225 · TMA1151457 | STRYKER CORPORATION | 10 Medical | Registered | 2022 |
| ONEZERO 2000790 · TMA1103365 | A Medium Corporation | 41 Education | Registered | 2021 |
| OMEGARX 1968860 · TMA1250400 | Sears IP LLC | 5 Pharmaceuticals | Registered | 2024 |
| OMICRON 1967194 · TMA1098716 | OMICRON electronics GmbH, a legal entity | 9 Electronics16 Paper42 Science | Registered | 2021 |
| OMNIGRIP 1954633 · TMA1221785 | Prym Consumer USA Inc. | 9 Electronics | Registered | 2024 |