| ONEPATH 1677257 · TMA904613 | SHIRE HUMAN GENETIC THERAPIES, INC. a Delaware corporation | 9 Electronics35 Advertising36 Finance+1 | Registered | 2015 |
| OnPitch 2309065 | OnPitch Holdings Inc. | 9 Electronics35 Advertising38 Telecommunications+2 | Pending | 2024 |
| ONPATTRO 1852712 · TMA1026358 · design | Alnylam Pharmaceuticals, Inc. | 5 Pharmaceuticals | Registered | 2019 |
| ONPATTRO 1793703 · TMA1025568 | Alnylam Pharmaceuticals, Inc. | 5 Pharmaceuticals | Registered | 2019 |
| OWNPETS 2051525 · TMA1203744 | Mambate US Inc. | 18 Leather | Registered | 2023 |
| ONFYDAZ 2238712 · TMA1240510 | Owner not listed | 5 Pharmaceuticals | Registered | 2024 |
| OMVED 2149607 · TMA1243871 · design | J. E. Hammer & Söhne Group GmbH | 3 Cosmetics | Registered | 2024 |
| ONEFIT 2098859 · TMA1189450 | an individual | 25 Clothing | Registered | 2023 |
| OMNIVITE 2088049 · TMA1168847 | 12693577 Canada Inc. | 5 Pharmaceuticals | Registered | 2023 |
| ONBODY 2083233 · TMA1284177 | Coherus Biosciences, Inc. | 10 Medical | Registered | 2025 |
| Omabeta 2076406 · TMA1155412 | SHENZHEN CHUJIN NETWORK TECHNOLOGY CO.LTD | 21 Housewares | Registered | 2022 |
| ONEFIT 2072550 · TMA1185973 | Blanchard Vision Corp. | 9 Electronics | Registered | 2023 |
| ONEBTTL 1 2066650 · TMA1162375 · design | BESTORE TECHNOLOGY LIMITED | 21 Housewares | Registered | 2023 |
| One2Feed 2050807 · TMA1273786 | Owner not shown | 7 Machines9 Electronics | Registered | 2024 |
| ONEVIT 1983751 · TMA1128255 | CANADIAN NEUTRICEUTICAL HEALTH INC. | 5 Pharmaceuticals | Registered | 2022 |
| ONEBOT 1903830 · TMA1076399 · design | DIT Technology co.,ltd | 9 Electronics | Registered | 2020 |
| OMNIVAD 1903510 · TMA1114319 | an individual | 1 Chemicals | Registered | 2021 |
| ONEBOT 1892970 · TMA1032780 · design | Beijing AIQI Technology Co. LTD. | 28 Toys | Registered | 2019 |
| ONEBOT 1865629 · TMA1024122 · design | Beijing AIQI Technology Co. LTD. | 28 Toys | Registered | 2019 |
| ONEFEED 1857085 · TMA1059809 | Koch Agronomic Services, LLC | 1 Chemicals | Registered | 2019 |
| OmniPad 1836800 · TMA1094461 | an individual | 9 Electronics28 Toys | Registered | 2021 |
| ONVATION 1836167 · TMA1072739 · design | Kimberly-Clark Worldwide, Inc. | 3 Cosmetics9 Electronics16 Paper+2 | Registered | 2020 |
| OMNIVITA 1800820 · TMA1007375 | OmniVita Custom Wealth Management Inc. | 35 Advertising36 Finance41 Education+1 | Registered | 2018 |
| OMNIPOD 1793186 · TMA1053329 · design | Insulet Corporation | 10 Medical | Registered | 2019 |
| ONVATION 1719255 · TMA1049609 | Kimberly-Clark Worldwide, Inc. | 9 Electronics | Registered | 2019 |