| Oinsi 2256199 · TMA1276183 | an individual | 14 Jewellery | Registered | 2024 |
| ONSIA 1884808 · TMA1070231 | Dedicated Sound and Audio Inc. | 9 Electronics16 Paper | Registered | 2020 |
| OMSI 2057614 · TMA1144830 · design | an individual | 7 Machines9 Electronics12 Vehicles | Registered | 2022 |
| ONS 1938253 · TMA1203391 | SPECTRUM HEALTH CARE LP, a legal entity | 35 Advertising37 Construction39 Transport+4 | Registered | 2023 |
| ONSO 2294406 | Owner not listed | 1 Chemicals5 Pharmaceuticals9 Electronics+1 | Pending | 2023 |
| ONESIE 2186469 · TMA1223854 | Owner not shown | 12 Vehicles | Registered | 2024 |
| ONCAI 2157827 · TMA1218367 · design | Shenzhen Yichen Shidai Trading Co. Ltd. | 25 Clothing | Registered | 2024 |
| ONNIX 2082709 · TMA1181541 · design | Shenzhen Freemax Tech Co.LTD. | 34 Tobacco | Registered | 2023 |
| ONZIE 1874088 · TMA1102346 | Onzie, Inc. (A corporation of California) | 25 Clothing27 Carpets28 Toys+1 | Registered | 2021 |
| OneIQ 1955901 | Lanamark Inc. | 9 Electronics | Pending | 2019 |
| OMNISCI 2042307 | OmniSci, Inc. | 9 Electronics42 Science | Pending | 2020 |
| ONEEKK 2266021 · TMA1285027 | Shenzhen Benbenxiang Electronic Commerce Co. Ltd. | 21 Housewares | Registered | 2025 |
| OHMNIS 2260541 · TMA1281121 · design | Ohmnis Inc. Joseph Kasumba, Blavasky Kasumba | 35 Advertising42 Science | Registered | 2025 |
| OMG 2257529 · TMA1267506 · design | OMG OASIS MEDITERRANEAN GRILL LTD. | 35 Advertising43 Restaurants | Registered | 2024 |
| ONEYUS 2233734 · TMA1256667 · design | Shenzhen Aoyin Lighting Co. Ltd | 20 Furniture | Registered | 2024 |
| OMEGA 2230572 · TMA1245662 · design | an individual | 9 Electronics | Registered | 2024 |
| OMNIAGEO 2215933 · TMA1202041 | OMNIAGEO Inc. | 42 Science | Registered | 2023 |
| ONYX 2191511 · TMA1233841 | Owner not shown | 35 Advertising44 Medical | Registered | 2024 |
| OMOJI 2186481 · TMA1284476 · design | GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP. LTD. | 9 Electronics | Registered | 2025 |
| OWIMX 2169070 · TMA1219920 | Shenzhen Yehong Electronic Commerce Co. Ltd. | 21 Housewares | Registered | 2024 |
| OMEGA 2151334 · TMA1186790 | Europart Supply LLC | 12 Vehicles | Registered | 2023 |
| OMEGA 2137078 · TMA1198009 · design | NATION DIVINE | 25 Clothing | Registered | 2023 |
| OIMG 2119769 · TMA1184220 | Fujian Miling Technology Co. Ltd. | 25 Clothing | Registered | 2023 |
| Ownwis 2115531 · TMA1193574 | an individual | 25 Clothing | Registered | 2023 |
| ONUS 2114825 · TMA1225879 · design | Zhongshan Shengtai Metal Goods Co. Ltd. | 6 Metal | Registered | 2024 |