| OHTSU 0698458 · TMA415219 | Sumitomo Rubber Industries, Ltd. | 12 Vehicles | Registered | 1993 |
| OTSO 2221581 · TMA1239045 | OTSO CYCLES, LLC | 12 Vehicles | Registered | 2024 |
| OTS 1807908 · TMA1045598 | '47 Brand, LLC, a Delaware limited liability company | 25 Clothing | Registered | 2019 |
| OTS 0848853 · TMA499893 · design | OCEAN TRANSPORTATION SERVICES FREIGHT FORWARDING INC. | 39 Transport | Registered | 1998 |
| OTS 0848847 · TMA499898 | OCEAN TRANSPORTATION SERVICES FREIGHT FORWARDING INC. | 39 Transport | Registered | 1998 |
| OTTUS 2038299 · TMA1141330 | LVGLOMARK Corp. | 18 Leather21 Housewares25 Clothing+1 | Registered | 2022 |
| OTISS 1573169 · TMA857730 | TRANSOFT SOLUTIONS INC. | 39 Transport42 Science | Registered | 2013 |
| OTAZU 1162384 · TMA656702 | an individual | 14 Jewellery16 Paper18 Leather+1 | Registered | 2006 |
| OETZI 2226399 · TMA1252601 · design | BEIJING JIURICHENG TECHNOLOGY AND TRADE CO. LTD. | 25 Clothing | Registered | 2024 |
| Outus 2226069 · TMA1251285 | SHENZHEN JUANJING NETWORK TECHNOLOGY CO., LTD. | 16 Paper | Registered | 2024 |
| Oddekey 2217670 · TMA1245520 | an individual | 21 Housewares | Registered | 2024 |
| OUTASK 2203845 · TMA1239969 · design | Shenzhen Habitat Technology Co., Ltd. | 11 Lighting | Registered | 2024 |
| Odokee 2177243 · TMA1227243 | Shenzhen Yixunjie Electronic Commerce Co. Ltd. | 14 Jewellery | Registered | 2024 |
| ODIGO 2168359 · TMA1284350 · design | ODIGO | 9 Electronics38 Telecommunications42 Science | Registered | 2025 |
| OYedis 2148261 · TMA1205183 | Dongguan Yichen Electronics Co. Ltd | 11 Lighting | Registered | 2023 |
| Ottoza 2144451 · TMA1201677 | an individual | 8 Hand13 Firearms | Registered | 2023 |
| OHDOKI 2135543 · TMA1236968 · design | an individual | 9 Electronics10 Medical | Registered | 2024 |
| OTUHSI 2129061 · TMA1192044 | an individual | 25 Clothing | Registered | 2023 |
| OTAK 2107332 · TMA1181719 | an individual | 3 Cosmetics | Registered | 2023 |
| OODAAQ 2094741 · TMA1162662 · design | an individual | 33 Wine | Registered | 2023 |
| ODYSSEY 2036351 · TMA1132852 | Orbis Corporation | 20 Furniture | Registered | 2022 |
| OTECKA 2027641 · TMA1147810 | Tecka International Inc. | 25 Clothing28 Toys35 Advertising | Registered | 2022 |
| OTACI 2005382 · TMA1137327 · design | an individual | 3 Cosmetics | Registered | 2022 |
| ODACC 1980827 · TMA1273449 · design | ADR Chambers Adjudication Inc. | 41 Education45 Legal | Registered | 2024 |
| Odoga 1949475 · TMA1122007 | an individual | 11 Lighting | Registered | 2022 |