| outpram 2156851 · TMA1231191 | Guangzhou Runing Technology Co. LTD | 9 Electronics | Registered | 2024 |
| OUTFRONT 1983336 · TMA1134690 | Barrique Wine Imports Ltd. | 33 Wine | Registered | 2022 |
| OTTOFRAN 1926608 · TMA1113497 · design | Groupe MMO Inc./MMo Group Inc. | 35 Advertising37 Construction | Registered | 2021 |
| OTTOFRAN 1831422 · TMA1005514 | Groupe MMO Inc./MMo Group Inc. | 35 Advertising37 Construction | Registered | 2018 |
| OTIPRIO 1740757 · TMA1031742 | ALK-Abelló, Inc. | 5 Pharmaceuticals44 Medical | Registered | 2019 |
| OUTBRAIN 1689803 · TMA951426 · design | Outbrain, Inc. | 9 Electronics35 Advertising | Registered | 2016 |
| OUT2PROTECT 1674383 · TMA919208 · design | OUT2PROTECT INC. | 9 Electronics14 Jewellery16 Paper+5 | Registered | 2015 |
| ODAPRA 1594901 · TMA881237 | Celgene Corporation | 5 Pharmaceuticals | Registered | 2014 |
| OTBORNY 1528125 · TMA830004 | YEREVAN BRANDY COMPANY, CJSC | 33 Wine | Registered | 2012 |
| OUTBRAIN 1528118 · TMA883849 | Outbrain, Inc. | 9 Electronics35 Advertising41 Education | Registered | 2014 |
| OTOPORE 1360065 · TMA745518 | Stryker European Operations Limited | 5 Pharmaceuticals | Registered | 2009 |
| OUTBREAK 1308889 · TMA746962 | Markel Corporation | 36 Finance | Registered | 2009 |
| OUTBURST 0848821 · TMA502251 | an individual | 9 Electronics12 Vehicles28 Toys | Registered | 1998 |
| OUTBURST 2340242 | The Upper Deck Company | 9 Electronics16 Paper | Pending | 2024 |
| OHTUVAYRE 2336427 · design | Verona Pharma PLC | 5 Pharmaceuticals42 Science44 Medical | Pending | 2024 |
| OUTPRIZE 2334005 | Jiangmen Wanzhu Hardware Products Co. Ltd | 12 Vehicles20 Furniture | Pending | 2024 |
| OUTPRO 2309270 · design | Guangzhou Dehengqinxin Industrial Operation Management Co. Ltd. | 18 Leather25 Clothing | Pending | 2023 |
| OUTFORCE 2308353 · design | Canadian Technology Properties Ltd. | 35 Advertising42 Science | Pending | 2024 |
| OUTFORCE 2308352 | Canadian Technology Properties Ltd. | 35 Advertising42 Science | Pending | 2024 |
| OTVReliant 2302315 | Owner not listed | 6 Metal7 Machines9 Electronics+5 | Pending | 2023 |
| OUTFREE 2275687 · design | Zhejiang Jiaxing Jesun Digital Technology Co. Ltd | 7 Machines9 Electronics18 Leather+2 | Pending | 2023 |
| OutPro 2194641 | OUT-PRO DISTRIBUTOR INC. | 7 Machines11 Lighting12 Vehicles+1 | Pending | 2022 |
| OUTBREAKER 2031694 | 2071939 Alberta Ltd. | 1 Chemicals9 Electronics10 Medical+6 | Pending | 2020 |