| ONTUBE 2188933 · TMA1232779 | Owner not shown | 21 Housewares | Registered | 2024 |
| ONETOP 2161724 · TMA1219233 | Shenzhen Onetop Trade Co. Ltd. | 9 Electronics | Registered | 2024 |
| ontoffee 2155488 · TMA1207733 | Xilinmen Furniture Co., Ltd. | 20 Furniture | Registered | 2023 |
| ONEDB 2108402 · TMA1158381 · design | HCL America Inc. | 9 Electronics42 Science | Registered | 2022 |
| ONDIBTA 2085502 · TMA1147064 | an individual | 5 Pharmaceuticals | Registered | 2022 |
| ONTOP 2076856 · TMA1180166 | an individual | 21 Housewares | Registered | 2023 |
| OntopVKG 2075891 · TMA1212881 | Free University of Bolzano | 9 Electronics42 Science | Registered | 2023 |
| ONDEVIX 2019189 · TMA1157911 | Owner not shown | 5 Pharmaceuticals | Registered | 2022 |
| ONETWOFIT 1952980 · TMA1224798 · design | Shenzhen Yidajian Trading Co. Ltd. | 28 Toys | Registered | 2024 |
| OMNIDAB 1924971 · TMA1112269 | Open Monoclonal Technology, Inc. | 1 Chemicals42 Science | Registered | 2021 |
| ONDOFLU 1879240 · TMA1053159 | an individual | 5 Pharmaceuticals | Registered | 2019 |
| OWNTV 1799686 · TMA1052493 | OWN, LLC | 38 Telecommunications41 Education | Registered | 2019 |
| ONETAP 1732813 · TMA945949 | AppColony Inc. | 9 Electronics38 Telecommunications42 Science | Registered | 2016 |
| ONDAFLEX 1662043 · TMA929645 · design | an individual | 20 Furniture24 Textiles | Registered | 2016 |
| ONTAP 1656222 · TMA916650 | NetApp, Inc. | 9 Electronics41 Education42 Science | Registered | 2015 |
| Onetopick 1595895 · TMA876677 | 8541116 Canada inc. | 8 Hand | Registered | 2014 |
| ONDUVILLA 1551484 · TMA879913 | Onduline | 1 Chemicals19 Building | Registered | 2014 |
| ONTIP 1529491 · TMA879397 | JMI Sportswear Pte. Ltd. | 9 Electronics | Registered | 2014 |
| OnTheHub 1431526 · TMA794971 | Valsoft Corporation Inc. | 35 Advertising | Registered | 2011 |
| ONTOPIC 1397588 · TMA766399 | INSIGHTRIX RESEARCH INC. | 9 Electronics14 Jewellery16 Paper+7 | Registered | 2010 |
| OMNITAPE 1110308 · TMA607361 | an individual | 5 Pharmaceuticals10 Medical | Registered | 2004 |
| ONTAVAC 0677418 · TMA492039 | Boehringer Ingelheim Vetmedica GmbH | 5 Pharmaceuticals | Registered | 1998 |
| OMTOBRAND 2355330 · design | Om (Guangzhou) Information Technology Co.Ltd | 18 Leather | Pending | 2024 |
| ONETAB 2347679 | OneTab Ltd | 9 Electronics42 Science | Pending | 2024 |
| OneAdvanced 2311903 | Advanced Business Software and Solutions Limited | 9 Electronics16 Paper35 Advertising+4 | Pending | 2024 |