| Ouka 2039302 · TMA1141354 | Zhejiang Subrtex Technology Co. Ltd | 20 Furniture24 Textiles | Registered | 2022 |
| OKAYA 1470122 · TMA796693 · design | Okaya Electric Industries Co. Ltd. | 9 Electronics | Registered | 2011 |
| OKIYA 1435569 · TMA768174 · design | S.D. Variations inc. | 3 Cosmetics10 Medical35 Advertising | Registered | 2010 |
| OKAYA 1366576 · TMA775325 · design | Okaya Electric Industries Co. Ltd. | 9 Electronics11 Lighting | Registered | 2010 |
| Oaksea 2194438 · TMA1235104 | Shenzhen Feituo Tianxia Trading Co. Ltd. | 21 Housewares | Registered | 2024 |
| ÖZKA 2185716 · TMA1231496 · design | Owner not shown | 12 Vehicles | Registered | 2024 |
| OSEEA 2160354 · TMA1218491 | Allergan Sales, LLC | 5 Pharmaceuticals | Registered | 2024 |
| OKKEAI 2132661 · TMA1194829 | Ankang Haohan Trading Co. Ltd. | 16 Paper | Registered | 2023 |
| OSKA 2118303 · TMA1217071 | Oska, Inc. | 10 Medical | Registered | 2024 |
| Ohkaye 2101859 · TMA1195417 | Ohkaye Ltd. | 14 Jewellery25 Clothing | Registered | 2023 |
| OAKKY 2033122 · TMA1161122 · design | PUTIAN YAJIU TRADING CO. LTD. | 14 Jewellery | Registered | 2023 |
| Ozey 2022126 · TMA1132291 | an individual | 41 Education | Registered | 2022 |
| OIKIA 1990621 · TMA1126972 | an individual | 29 Meat30 Coffee35 Advertising | Registered | 2022 |
| OOKEOO 1951852 · TMA1224735 · design | OOKEOO INC | 34 Tobacco | Registered | 2024 |
| OSEA 1921695 · TMA1109904 | an individual | 3 Cosmetics | Registered | 2021 |
| OKYO 1910137 · TMA1110915 | OKYO Pharma Corporation | 5 Pharmaceuticals42 Science | Registered | 2021 |
| OZAYA 1873228 · TMA1047397 | an individual | 14 Jewellery18 Leather25 Clothing+1 | Registered | 2019 |
| OAKE 1872757 · TMA1152539 | Macy's Merchandising Group, Inc. | 20 Furniture24 Textiles | Registered | 2022 |
| OSKA 1841403 · TMA1072940 | Oska Care Limited | 10 Medical24 Textiles | Registered | 2020 |
| OCEA 1825862 · TMA1001888 · design | SHIMANO INC. | 28 Toys | Registered | 2018 |
| OKE 1815926 · TMA1163861 | OKE Group GmbH | 6 Metal9 Electronics10 Medical+10 | Registered | 2023 |
| OKA 1724712 · TMA1044885 · design | an individual | 8 Hand9 Electronics11 Lighting+5 | Registered | 2019 |
| oXya 1648162 · TMA950189 | Oxya - Société par Actions Simplifiée | 9 Electronics35 Advertising42 Science | Registered | 2016 |
| OKA 1585502 · TMA981329 | OKA Direct Limited | 2 Paints4 Oils6 Metal+19 | Registered | 2017 |
| OUIJA 1510479 · TMA862927 | HASBRO, INC. | 28 Toys | Registered | 2013 |