| OsteoStrong 1746417 · TMA1022892 | True Wellness, Inc. | 41 Education44 Medical | Registered | 2019 |
| OihcDosff 2250734 · TMA1276080 | Shenzhen Color Bag E-Commerce Co. Ltd | 11 Lighting | Registered | 2024 |
| OQTIQ 2249305 · TMA1268656 | Owner not listed | 9 Electronics | Registered | 2024 |
| OsteoSync 2213391 · TMA1232935 | SMED-TA/TD, LLC | 10 Medical | Registered | 2024 |
| OXDOG 2183696 · TMA1254921 | an individual | 28 Toys | Registered | 2024 |
| OctsumYing 2175194 · TMA1226166 | Guangzhou Yingbohe Trading Co. Ltd. | 21 Housewares | Registered | 2024 |
| Octocurl 2132424 · TMA1194343 | an individual | 26 Sewing | Registered | 2023 |
| OSTEOCONNECT 2113416 · TMA1208435 | Smith & Nephew, Inc. | 10 Medical | Registered | 2023 |
| Okydoky 2106201 · TMA1176625 | Zhenhui Technology (Shenzhen) Co. Ltd. | 27 Carpets | Registered | 2023 |
| OCTOGOLD 2072249 · TMA1282229 | DURADRIVE SYSTEMS INTERNATIONAL INC. | 1 Chemicals6 Metal | Registered | 2025 |
| OctaCoil 2068831 · TMA1280252 | SE Therapies Ltd. | 10 Medical | Registered | 2025 |
| OCTAS 2054480 · TMA1244891 · design | Bright International Group Holdings Ltd. | 11 Lighting35 Advertising | Registered | 2024 |
| OSTACO 2040903 · TMA1282033 | Owner not shown | 6 Metal19 Building37 Construction+2 | Registered | 2025 |
| OXDIGI 2034462 · TMA1138662 · design | Shanghai FeiTuYou Technology Co. Ltd | 9 Electronics | Registered | 2022 |
| OCTAGON 2030316 · TMA1165356 | Interprovincial Cooperative Limited | 5 Pharmaceuticals | Registered | 2023 |
| OCTECH 2021405 · TMA1263793 | Shenzhen Able Electronics Co. Ltd | 21 Housewares35 Advertising | Registered | 2024 |
| OYSTEC 2000665 · TMA1160924 | Oystec GmbH & Co. KG | 9 Electronics35 Advertising36 Finance+2 | Registered | 2023 |
| Ostazt 1989828 · TMA1130357 | Shenzhen Yinuo Technology Co. Ltd. | 9 Electronics | Registered | 2022 |
| OXDOG 1989555 · TMA1111333 | an individual | 9 Electronics25 Clothing28 Toys | Registered | 2021 |
| OZTEK 1986397 · TMA1126946 | an individual | 1 Chemicals9 Electronics | Registered | 2022 |
| Ostazt 1984213 · TMA1130281 | Shenzhen Yinuo Technology Co. Ltd. | 20 Furniture | Registered | 2022 |
| Ostazt 1984211 · TMA1130280 | Shenzhen Yinuo Technology Co. Ltd. | 6 Metal | Registered | 2022 |
| OKEYDOKEY 1929639 · TMA1123708 | Okeydokey LLC | 43 Restaurants | Registered | 2022 |
| OCTIQ 1928581 · TMA1109763 | Innovus Pharmaceuticals, Inc. | 3 Cosmetics5 Pharmaceuticals | Registered | 2021 |
| OKADOGAN 1834714 · TMA1078095 | OKADOGAN BOARD AND GROOM INC. | 3 Cosmetics5 Pharmaceuticals8 Hand+9 | Registered | 2020 |