| ODISI 2359483 | Altyx Surgical, Inc. | 10 Medical41 Education | Pending | 2024 |
| OTIS 1811667 · TMA1017718 · design | Otis Products, Inc. dba Otis Technology, Inc. | 1 Chemicals4 Oils8 Hand+4 | Registered | 2019 |
| ODS 1646277 · TMA951696 | an individual | 3 Cosmetics | Registered | 2016 |
| OTIS 1630126 · TMA939071 | TForce Holdings Inc. | 35 Advertising | Registered | 2016 |
| ODES 1571206 · TMA846929 | 1211311 Alberta Ltd. | 1 Chemicals4 Oils6 Metal+8 | Registered | 2013 |
| OTIS 1184152 · TMA670295 | Aspire Bakeries LLC | 30 Coffee | Registered | 2006 |
| OTIS 0991691 · NFLD1691 · design | OTIS ELEVATOR COMPANY | 7 Machines9 Electronics16 Paper+1 | Registered | 1929 |
| OTIS 0991379 · NFLD1379 | OTIS ELEVATOR COMPANY | 7 Machines9 Electronics13 Firearms+2 | Registered | 1926 |
| OTIS 0573185 · TMA345741 | OTIS ELEVATOR COMPANY (A NEW JERSEY CORPORATION) | 37 Construction | Registered | 1988 |
| OTIS 0230156 · TMA108234 | Halliburton Energy Services, Inc. (a Delaware Corporation) | 1 Chemicals2 Paints3 Cosmetics+5 | Registered | 1957 |
| OTIS 0230155 · TMA108233 · design | Halliburton Energy Services, Inc. (a Delaware Corporation) | 1 Chemicals2 Paints3 Cosmetics+5 | Registered | 1957 |
| OTIS 0159840 · TMDA56612 · design | OTIS ELEVATOR COMPANY (A NEW JERSEY CORPORATION) | 3 Cosmetics7 Machines9 Electronics+1 | Registered | 1933 |
| OTIS 0159839 · TMDA57039 | OTIS ELEVATOR COMPANY (A NEW JERSEY CORPORATION) | 3 Cosmetics7 Machines9 Electronics+1 | Registered | 1933 |
| ODAS 2256329 | ARA Robotique Inc. | 41 Education42 Science | Pending | 2023 |
| OYedis 2148261 · TMA1205183 | Dongguan Yichen Electronics Co. Ltd | 11 Lighting | Registered | 2023 |
| ODISSI 2295801 · design | Owner not listed | 18 Leather25 Clothing | Pending | 2023 |
| ODIGO 2168359 · TMA1284350 · design | ODIGO | 9 Electronics38 Telecommunications42 Science | Registered | 2025 |
| ODASS 1881613 · TMA1069095 · design | 9374-7806 Québec inc. | 11 Lighting20 Furniture | Registered | 2020 |
| ODIGO 1852308 · TMA1117651 | ODIGO | 9 Electronics38 Telecommunications42 Science | Registered | 2022 |
| OATIS 1821971 · TMA1019197 | an individual | 29 Meat30 Coffee | Registered | 2019 |
| OTISS 1573169 · TMA857730 | TRANSOFT SOLUTIONS INC. | 39 Transport42 Science | Registered | 2013 |
| ODASI 1567286 · TMA869297 | 7752105 CANADA INC. | 14 Jewellery18 Leather25 Clothing+1 | Registered | 2014 |
| ODESK 1549644 · TMA866252 | Upwork Global Inc. | 9 Electronics35 Advertising41 Education | Registered | 2013 |
| ODESI 1439540 · TMA799918 | Ontario Council of University Libraries (OCUL) an affiliate of the Council of Ontario Universities (COU) | 16 Paper42 Science | Registered | 2011 |
| OETZI 2226399 · TMA1252601 · design | BEIJING JIURICHENG TECHNOLOGY AND TRADE CO. LTD. | 25 Clothing | Registered | 2024 |