| OTL 1520635 · TMA869783 | GOUVERNEUR INC. | 35 Advertising36 Finance37 Construction+4 | Registered | 2014 |
| ODEL 1295345 · TMA757030 · design | Odel PLC | 25 Clothing | Registered | 2010 |
| OTELO 0791515 · TMA511513 | o.tel.o communications GmbH & Co. | 9 Electronics35 Advertising37 Construction+1 | Registered | 1999 |
| OTTELLA 1862625 · TMA1022365 · design | Owner not shown | 33 Wine | Registered | 2019 |
| OATWELL 1637494 · TMA1041504 | Givaudan SA | 5 Pharmaceuticals29 Meat30 Coffee+1 | Registered | 2019 |
| ODWALLA 2197711 · TMA1242580 | Full Sail IP Brandco 1, LLC | 5 Pharmaceuticals29 Meat30 Coffee+2 | Registered | 2024 |
| OATLY 2166969 · TMA1232332 | an individual | 9 Electronics29 Meat31 Fresh+2 | Registered | 2024 |
| Outill 2121413 · TMA1198792 | Foshan Ailuoke Furniture Co. Ltd. | 28 Toys | Registered | 2023 |
| OTTLO 2091851 · TMA1171337 | FANDEMIQ INC. | 35 Advertising | Registered | 2023 |
| ODELE 2042962 · TMA1123197 | ODELE, LLC | 3 Cosmetics | Registered | 2022 |
| ODELO 2018320 · TMA1138507 · design | odelo GmbH | 11 Lighting12 Vehicles42 Science | Registered | 2022 |
| ODLA 2003288 · TMA1147645 · design | an individual | 9 Electronics15 Musical28 Toys | Registered | 2022 |
| OTHELLO 1979815 · TMA1133791 · design | Maitland-Othello GmbH | 7 Machines11 Lighting21 Housewares | Registered | 2022 |
| OUTLAW 1969034 · TMA1255696 | S.F. MARKETING INC. | 9 Electronics15 Musical | Registered | 2024 |
| OATLY 1849382 · TMA1179771 | an individual | 5 Pharmaceuticals9 Electronics14 Jewellery+11 | Registered | 2023 |
| OATLY 1820937 · TMA1030544 | an individual | 29 Meat30 Coffee32 Beer | Registered | 2019 |
| Othello 1797819 · TMA1024883 | Kabushiki Kaisha MegaHouse (MegaHouse Corporation) | 9 Electronics38 Telecommunications41 Education | Registered | 2019 |
| OTELIA 1782425 · TMA978384 · design | an individual | 5 Pharmaceuticals29 Meat30 Coffee+2 | Registered | 2017 |
| OUTLAW 1781652 · TMA1059696 | THOR TECH, INC. | 12 Vehicles | Registered | 2019 |
| Outlaw 1679478 · TMA910754 | S.F. MARKETING INC. | 15 Musical | Registered | 2015 |
| OUTLAW 1669070 · TMA978169 | B&M Racing & Performance Products Inc. | 7 Machines | Registered | 2017 |
| Otelia 1622255 · TMA932095 | an individual | 5 Pharmaceuticals29 Meat30 Coffee+2 | Registered | 2016 |
| OUTLAW 1575497 · TMA888454 | Dutch Blacksmith Shop Ltd. | 7 Machines | Registered | 2014 |
| OUTLAW 1496880 · TMA860194 | Sunbeam Products, Inc. | 8 Hand | Registered | 2013 |
| ODILLE 1458526 · TMA790999 | Urban Outfitters Wholesale, Inc. | 25 Clothing | Registered | 2011 |