| ODES 1571206 · TMA846929 | 1211311 Alberta Ltd. | 1 Chemicals4 Oils6 Metal+8 | Registered | 2013 |
| ODIS 1356539 · TMA715566 | an individual | 20 Furniture | Registered | 2008 |
| ODAS 2256329 | ARA Robotique Inc. | 41 Education42 Science | Pending | 2023 |
| OTS 1807908 · TMA1045598 | '47 Brand, LLC, a Delaware limited liability company | 25 Clothing | Registered | 2019 |
| ODC 1802759 · TMA990500 · design | ODC INTERNATIONAL (HONG KONG) COMPANY LIMITED | 3 Cosmetics5 Pharmaceuticals21 Housewares | Registered | 2018 |
| ODJ 1705357 · TMA972494 | RBC Ministries Corporation | 9 Electronics16 Paper35 Advertising+3 | Registered | 2017 |
| ODX 1627079 · TMA932060 | OD EXCELLENCE, LLC, a legal entity | 35 Advertising | Registered | 2016 |
| ODC 1607782 · TMA868593 · design | ODC Alliance Inc. | 37 Construction42 Science | Registered | 2014 |
| ODC 1347554 · TMA715590 | Owner not shown | 9 Electronics | Registered | 2008 |
| OTS 0848853 · TMA499893 · design | OCEAN TRANSPORTATION SERVICES FREIGHT FORWARDING INC. | 39 Transport | Registered | 1998 |
| OTS 0848847 · TMA499898 | OCEAN TRANSPORTATION SERVICES FREIGHT FORWARDING INC. | 39 Transport | Registered | 1998 |
| ODQ 0381474 · TMA215986 · design | Owner not shown | 35 Advertising41 Education44 Medical | Registered | 1976 |
| ODK 2332936 | Hangzhou Aodikai Smart Home Co. Ltd. | 20 Furniture | Pending | 2024 |
| ODX 2106005 | 11924958 CANADA INC. | 11 Lighting12 Vehicles35 Advertising | Pending | 2021 |
| ODX 1967134 | Linear Financial Technologies LLC | 9 Electronics35 Advertising36 Finance+1 | Pending | 2019 |
| ODASS 1881613 · TMA1069095 · design | 9374-7806 Québec inc. | 11 Lighting20 Furniture | Registered | 2020 |
| 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 |
| ODISI 2359483 | Altyx Surgical, Inc. | 10 Medical41 Education | Pending | 2024 |
| OETZI 2226399 · TMA1252601 · design | BEIJING JIURICHENG TECHNOLOGY AND TRADE CO. LTD. | 25 Clothing | Registered | 2024 |
| Outus 2226069 · TMA1251285 | SHENZHEN JUANJING NETWORK TECHNOLOGY CO., LTD. | 16 Paper | Registered | 2024 |
| OTSO 2221581 · TMA1239045 | OTSO CYCLES, LLC | 12 Vehicles | Registered | 2024 |
| Oddekey 2217670 · TMA1245520 | an individual | 21 Housewares | Registered | 2024 |
| OUTASK 2203845 · TMA1239969 · design | Shenzhen Habitat Technology Co., Ltd. | 11 Lighting | Registered | 2024 |