| OETIO 1553581 · TMA877845 · design | OETIO | 16 Paper41 Education | Registered | 2014 |
| OETIO 1553098 · TMA877843 · design | OETIO | 16 Paper41 Education | Registered | 2014 |
| Oduio 2187071 · TMA1223206 | Shenzhen Xingaichen Trading CO. LTD. | 9 Electronics14 Jewellery28 Toys | Registered | 2024 |
| OUTDO 2152766 · TMA1188831 · design | XIAMEN MEGA KINGDOM TECHNOLOGY CO. LTD. | 9 Electronics | Registered | 2023 |
| OTTO 2041077 · TMA1142839 · design | Owner not shown | 8 Hand | Registered | 2022 |
| OTTO 1915264 · TMA1094996 | Fastenhaus Limited | 5 Pharmaceuticals9 Electronics11 Lighting+7 | Registered | 2021 |
| OTTO 1903080 · TMA1083703 · design | Otto International, Inc. a legal entity | 18 Leather25 Clothing | Registered | 2020 |
| OTTO 1893325 · TMA1077910 | Otto International, Inc. a legal entity | 18 Leather25 Clothing | Registered | 2020 |
| OTTO 1835669 · TMA1011576 · design | Persen Technologies Inc. | 9 Electronics38 Telecommunications39 Transport+1 | Registered | 2018 |
| OTTO 1785320 · TMA1055778 | an individual | 6 Metal20 Furniture21 Housewares | Registered | 2019 |
| OTTO 1779783 · TMA1055784 · design | an individual | 6 Metal20 Furniture | Registered | 2019 |
| OTTO 1746576 · TMA987861 | CLEARPATH ROBOTICS, INC. | 7 Machines35 Advertising42 Science | Registered | 2018 |
| OTI 1708125 · TMA986911 · design | Mitsubishi Chemical Corporation | 28 Toys | Registered | 2017 |
| OUTDO 1439817 · TMA778409 · design | XIAMEN MEGA KINGDOM TECHNOLOGY CO. LTD. | 9 Electronics21 Housewares | Registered | 2010 |
| ODDIO 1386506 · TMA774446 | an individual | 33 Wine | Registered | 2010 |
| OTTO 1270777 · TMA700579 · design | Otto International, Inc. | 25 Clothing | Registered | 2007 |
| OTTO 1269324 · TMA677201 · design | Persen Technologies Inc. | 9 Electronics | Registered | 2006 |
| OTI 1179754 · TMA624297 | ORGANIZATION THOUGHTWARE INTERNATIONAL INC. | 16 Paper35 Advertising41 Education | Registered | 2004 |
| OHTO 0619005 · TMA386295 · design | Ohto Kabushiki Kaisha (also trading as Ohto Co. Ltd.) | 16 Paper | Registered | 1991 |
| OTO 2348068 | Otonomos LLC | 35 Advertising36 Finance42 Science+1 | Pending | 2024 |
| OITTY 2332688 · design | Jiaxing Shangyuncai Digital Technology Co. Ltd | 24 Textiles25 Clothing | Pending | 2024 |
| OTTÓ 2324871 | FUTUREVERSE CORPORATION LIMITED | 9 Electronics35 Advertising36 Finance+2 | Pending | 2024 |
| OTTO 2301369 · design | OTTOGI CORPORATION, a legal entity | 29 Meat30 Coffee | Pending | 2023 |
| OTTO 2266409 · design | Owner not listed | 7 Machines11 Lighting21 Housewares | Pending | 2023 |
| OTI 2262306 · design | OTI Lumionics Inc. | 1 Chemicals9 Electronics42 Science | Pending | 2023 |