| ONELOCAL 2333008 | an individual | 35 Advertising42 Science | Pending | 2024 |
| ONELIGHT 1972506 · TMA1141763 | Masterhouse Consulting Inc. | 9 Electronics25 Clothing41 Education+2 | Registered | 2022 |
| 1 ONELOCAL 2264414 · design | an individual | 9 Electronics35 Advertising38 Telecommunications+5 | Pending | 2023 |
| ONELOOK 1320051 · TMA748899 · design | THE BANK OF NOVA SCOTIA | 36 Finance | Registered | 2009 |
| OneLook 1318249 · TMA750869 | THE BANK OF NOVA SCOTIA | 36 Finance | Registered | 2009 |
| ONELAKE 2264333 | Owner not listed | 9 Electronics42 Science | Pending | 2023 |
| ONELUXE 2152371 · design | Realty One Group International, LLC | 35 Advertising36 Finance | Pending | 2021 |
| ONLYKXY 2256388 · TMA1276219 | Dongguan Kexuying Electronic Commerce Co. Ltd. | 16 Paper | Registered | 2024 |
| Omlyclo 2188198 · TMA1282712 | CELLTRION, INC. | 5 Pharmaceuticals | Registered | 2025 |
| ONLYGUIDES 2164048 · TMA1198137 | Outplayed, Inc. | 9 Electronics41 Education | Registered | 2023 |
| ONLAKE 2161286 · TMA1211162 | Shenzhen iTime Ecommerce Co.Ltd. | 10 Medical11 Lighting14 Jewellery | Registered | 2023 |
| OMELIAJAE 2159157 · TMA1211034 | an individual | 35 Advertising | Registered | 2023 |
| Onlycosy 2099356 · TMA1175789 | an individual | 11 Lighting | Registered | 2023 |
| ONLYEST 2090384 · TMA1172393 | NINGBO YINZHOU ONLYEST COMMODITY CO.LTD | 21 Housewares | Registered | 2023 |
| OMNILEAK 2039183 · TMA1276973 | Valbatech Inc. | 9 Electronics35 Advertising38 Telecommunications+1 | Registered | 2024 |
| OMLIAGO 1947048 · TMA1070149 | an individual | 5 Pharmaceuticals | Registered | 2020 |
| OWNLOCAL 1914170 · TMA1108876 | Ownlocal Inc. | 35 Advertising | Registered | 2021 |
| ONYLUX 1900895 · TMA1096491 | neubourg invest GmbH & Co. KG | 3 Cosmetics5 Pharmaceuticals10 Medical | Registered | 2021 |
| ONLOCATION 1854988 · TMA1059293 | Constellation Homebuilder Systems Corp. | 42 Science | Registered | 2019 |
| OMEALS 1831057 · TMA1020897 | ALTERNATIVE INNOVATIONS LLC | 29 Meat30 Coffee | Registered | 2019 |
| OMALASS 1741803 · TMA964047 | Westway Feed Products LLC, a Delaware limited liability company | 31 Fresh | Registered | 2017 |
| ONILIKAN 1595393 · TMA911618 | CANNATUTLAN SUCRET SA DE CV | 29 Meat30 Coffee33 Wine | Registered | 2015 |
| OmniLocation 1514141 · TMA946652 | Computer Sciences Corporation a Nevada Corporation | 9 Electronics42 Science | Registered | 2016 |
| ONLYGREEN 1381088 · TMA744084 | 2137390 Ontario Inc. | 3 Cosmetics5 Pharmaceuticals25 Clothing | Registered | 2009 |
| OMNILUX 0771336 · TMA457962 · design | OMNILUX COMMUNICATIONS INC. | 9 Electronics16 Paper35 Advertising+1 | Registered | 1996 |