| OLEX 1628939 · TMA905736 · design | FINCHLEY RESEARCH & DEVELOPMENT INC. | 5 Pharmaceuticals | Registered | 2015 |
| OLEX 1628938 · TMA902230 · design | FINCHLEY RESEARCH & DEVELOPMENT INC. | 5 Pharmaceuticals | Registered | 2015 |
| OLEX 1579728 · TMA902231 | FINCHLEY RESEARCH & DEVELOPMENT INC. | 5 Pharmaceuticals | Registered | 2015 |
| OLEX 0489851 · TMA278580 | TForce Holdings Inc. | 39 Transport | Registered | 1983 |
| OLEX 0348850 · TMA195457 | UOP LLC (A DELAWARE CORPORATION) | 42 Science | Registered | 1973 |
| OliX 2170167 · TMA1262724 | OliX Pharmaceuticals, Inc. | 5 Pharmaceuticals42 Science | Registered | 2024 |
| OILAX 1963288 · TMA1137947 · design | Shenzhen Hengruisi Industrial Co., Ltd. | 10 Medical34 Tobacco | Registered | 2022 |
| OILES 1721054 · TMA957644 · design | Oiles Corporation | 6 Metal7 Machines9 Electronics+4 | Registered | 2016 |
| OILES 1721051 · TMA957531 · design | Oiles Corporation | 6 Metal7 Machines9 Electronics+4 | Registered | 2016 |
| OLEXA 1619051 · TMA904434 | Owner not shown | 1 Chemicals | Registered | 2015 |
| OILES 1412211 · TMA765177 | Oiles Corporation | 6 Metal7 Machines8 Hand+2 | Registered | 2010 |
| OLUX 1219397 · TMA651140 | Mayne Pharma, LLC | 5 Pharmaceuticals | Registered | 2005 |
| OLUX 2267772 · design | an individual | 17 Rubber22 Ropes31 Fresh+1 | Pending | 2023 |
| OWALGO 2249311 · TMA1268659 | Owner not listed | 20 Furniture | Registered | 2024 |
| Oillase 2212809 · TMA1243168 | Fuzhou feibao electronic commerce co., LTD | 3 Cosmetics | Registered | 2024 |
| OLEICO 2199898 · TMA1241248 | Owner not shown | 29 Meat | Registered | 2024 |
| Oligei 2177206 · TMA1252315 | an individual | 16 Paper | Registered | 2024 |
| OYLZG 2119575 · TMA1186398 · design | Shenzhen Yilianzhonggou Trading Co. Ltd. | 12 Vehicles28 Toys | Registered | 2023 |
| ouluoqi 2079802 · TMA1240873 | an individual | 9 Electronics | Registered | 2024 |
| OULUCCI 1990052 · TMA1128920 | Shenzhen Ouluoqi Technology Co. Ltd. | 9 Electronics | Registered | 2022 |
| OWLEEZ 1926216 · TMA1125238 | Spin Master Ltd. | 28 Toys | Registered | 2022 |
| OLIQ 1918275 · TMA1109065 | MIGROS-GENOSSENSCHAFTS-BUND | 5 Pharmaceuticals | Registered | 2021 |
| OLEIS 1899154 · TMA1085740 | Owner not shown | 11 Lighting | Registered | 2020 |
| OLC 1705602 · TMA950069 | Calgon Carbon Corporation, a Delaware corporation | 1 Chemicals | Registered | 2016 |
| OLOGY 1685225 · TMA955344 | WALGREEN CO. | 3 Cosmetics5 Pharmaceuticals11 Lighting+2 | Registered | 2016 |