| ONEBUN 1396325 · TMA748684 | Ozery's Pita Break Inc. | 30 Coffee | Registered | 2009 |
| OMNIBOND 2202894 · TMA1238908 | Omnibond Systems, LLC | 42 Science | Registered | 2024 |
| ONEPOINT 1644251 · TMA929231 | Owner not shown | 9 Electronics35 Advertising36 Finance+3 | Registered | 2016 |
| ONEPOINT. 2189835 · design | ONEPOINT | 9 Electronics35 Advertising36 Finance+5 | Pending | 2022 |
| Onefonno 2062720 | ONEFONNO LTD. | 9 Electronics20 Furniture21 Housewares+1 | Pending | 2020 |
| onebenefit 2239242 · TMA1261446 | The Leslie Group Limited | 36 Finance | Registered | 2024 |
| OmniPHONE 1484300 · TMA817437 | an individual | 9 Electronics35 Advertising | Registered | 2012 |
| ONFENDRUS 2231015 · TMA1247228 | GLAXO GROUP LIMITED | 5 Pharmaceuticals | Registered | 2024 |
| ONVIAN 2227183 · TMA1251420 | Shenzhen Onvian Technology Co .,Ltd | 9 Electronics | Registered | 2024 |
| ONEFINITY 2154807 · TMA1218282 · design | Yiwu City Jidian Network Technology Co. Ltd. | 14 Jewellery | Registered | 2024 |
| ONPOINT 2127840 · TMA1189805 | Simon Miller Sales Company | 16 Paper | Registered | 2023 |
| Ownfun 2108994 · TMA1191848 | an individual | 9 Electronics | Registered | 2023 |
| OMNIPOINT 2105309 · TMA1201336 | Pixelle Specialty Solutions LLC | 16 Paper | Registered | 2023 |
| OnPaint 2100769 · TMA1179105 | Owner not shown | 37 Construction | Registered | 2023 |
| OMBYNCA 2072061 · TMA1280346 | ELI LILLY AND COMPANY | 5 Pharmaceuticals | Registered | 2025 |
| OMVYENCE 2019190 · TMA1157084 | Owner not shown | 5 Pharmaceuticals | Registered | 2022 |
| ONPOINT 2016351 · TMA1166427 | OnPoint Technologies, LLC | 42 Science | Registered | 2023 |
| ONPOINTE 1910348 · TMA1092262 · design | an individual | 10 Medical | Registered | 2021 |
| OnPoint 1729544 · TMA961850 | Aviso Financial Inc./Financière Aviso inc. | 36 Finance | Registered | 2017 |
| ONPIN 1575566 · TMA849286 · design | Hong Bing Pneumatic Industry Co. Ltd. | 7 Machines | Registered | 2013 |
| Onefinestay 1524991 · TMA863512 | Lifealike Limited | 35 Advertising38 Telecommunications43 Restaurants | Registered | 2013 |
| ONYPEN 1504324 · TMA817342 | ARALEZ PHARMACEUTICALS CANADA INC. | 5 Pharmaceuticals | Registered | 2012 |
| OMNIBEAM 1502066 · TMA860505 | II-VI Delaware Inc. | 7 Machines | Registered | 2013 |
| ONPOINT 1461510 · TMA799871 | OnPoint Digital, Inc. | 9 Electronics42 Science | Registered | 2011 |
| ONPIN 1399778 · TMA743239 · design | Hong Bing Pneumatic Industry Co. Ltd. | 7 Machines | Registered | 2009 |