| OKLA 2251459 · TMA1270123 · design | Owner not listed | 12 Vehicles | Registered | 2024 |
| Ozuly 2243083 · TMA1263027 | Owner not listed | 9 Electronics | Registered | 2024 |
| OCULO 2238849 · TMA1254222 | Effcon Laboratories, Inc. | 5 Pharmaceuticals | Registered | 2024 |
| OUGELEE 2233505 · TMA1255273 | an individual | 11 Lighting | Registered | 2024 |
| Ousaliyea 2204044 · TMA1240037 | Guangzhou Ouyes Trading Co., Ltd. | 16 Paper | Registered | 2024 |
| OGLO 2194646 · TMA1235154 | 2301114 Alberta Ltd. | 9 Electronics11 Lighting | Registered | 2024 |
| Ousaliyea 2177203 · TMA1230147 | Guangzhou Ouyesi Trading Co. Ltd. | 9 Electronics | Registered | 2024 |
| OUXUL 2172578 · TMA1223136 | an individual | 9 Electronics | Registered | 2024 |
| OGL 2165861 · TMA1213390 · design | Guangzhou Dongchen Zhizao Supply Chain Co. LTD. | 25 Clothing | Registered | 2023 |
| Osailou 2147503 · TMA1204120 | Shenzhen Yunlaijun Technology Co. , Ltd. | 25 Clothing | Registered | 2023 |
| ouxile 2142174 · TMA1200357 | Hangzhou Chucheng Electronic Commerce Co. Ltd. | 25 Clothing | Registered | 2023 |
| OKOLO 2091041 · TMA1149375 | an individual | 43 Restaurants | Registered | 2022 |
| OAKLEY 2087045 · TMA1259214 | OAKLEY, INC. | 9 Electronics10 Medical | Registered | 2024 |
| OSCAL 2075366 · TMA1162551 · design | Shenzhen DOKE Electronic Co. Ltd. | 9 Electronics | Registered | 2023 |
| OCUELE 2072397 · TMA1184818 | A Healthy Path Pty, Ltd | 9 Electronics | Registered | 2023 |
| oxiuly 2055212 · TMA1169730 | Dong guan shi hai zhi xin dian zi shang wu co.,ltd | 25 Clothing | Registered | 2023 |
| Oaklu 2051085 · TMA1151805 | an individual | 37 Construction | Registered | 2022 |
| OXWELL 2049718 · TMA1166745 | Oxwell Group Inc. | 5 Pharmaceuticals | Registered | 2023 |
| OXILIA 2047094 · TMA1283895 · design | OXILIA INC. | 35 Advertising | Registered | 2025 |
| OCCULA 2041263 · TMA1204692 | Seeing Machines Limited | 9 Electronics42 Science | Registered | 2023 |
| OKLOE 1977385 · TMA1106517 | GLAXO GROUP LIMITED | 5 Pharmaceuticals | Registered | 2021 |
| OOKLA 1941927 · TMA1137989 | Ookla, LLC | 9 Electronics38 Telecommunications42 Science | Registered | 2022 |
| Ougual 1889699 · TMA1110117 | Shenzhen Aigua Technology Co.,Ltd | 3 Cosmetics19 Building20 Furniture | Registered | 2021 |
| OSCELLA 1878742 · TMA1064796 | Synthetic Genomics, Inc. | 9 Electronics42 Science | Registered | 2019 |
| OQL 1864732 · TMA1068895 | an individual | 7 Machines9 Electronics12 Vehicles | Registered | 2020 |