| ONFLEX 1674548 · TMA961047 | C.R. BARD, INC. A LEGAL ENTITY | 10 Medical | Registered | 2017 |
| ONFLEX 1207454 · TMA714493 | Avient Corporation | 1 Chemicals | Registered | 2008 |
| Onyflex 2241157 | neubourg invest GmbH & Co. KG | 3 Cosmetics5 Pharmaceuticals10 Medical | Pending | 2022 |
| Omniflex 2004069 · TMA1129064 | Owner not shown | 17 Rubber20 Furniture | Registered | 2022 |
| ONEFLOW 2236083 · TMA1256832 | Watts Regulator Co. | 1 Chemicals11 Lighting | Registered | 2024 |
| Oneflow 1863798 · TMA1094919 | hulle24 GmbH | 9 Electronics12 Vehicles18 Leather+2 | Registered | 2021 |
| OneFlock 2007254 · TMA1129134 | an individual | 45 Legal | Registered | 2022 |
| OneFolio 1730255 · TMA993828 | Laureate Education, Inc. a Delaware Corporation | 41 Education | Registered | 2018 |
| ONEPLUS 2126442 · TMA1221249 · design | OnePlus Technology (Shenzhen) Co. Ltd. | 18 Leather25 Clothing35 Advertising+3 | Registered | 2024 |
| ONEPLAN 1747101 · TMA956315 | ONEPLAN, INC. | 36 Finance39 Transport | Registered | 2016 |
| oneplus 1718910 · TMA946924 | OnePlus Technology (Shenzhen) Co. Ltd. | 3 Cosmetics18 Leather19 Building+3 | Registered | 2016 |
| ONEPLUS 1650101 · TMA978615 · design | OnePlus Technology (Shenzhen) Co. Ltd. | 9 Electronics | Registered | 2017 |
| ONEFILM 0620592 · TMA363708 | POLAROID CORPORATION | 1 Chemicals9 Electronics | Registered | 1989 |
| ONEPBLE 2297911 | an individual | 22 Ropes | Pending | 2023 |
| ONEPLUS 2267969 · design | Owner not listed | 9 Electronics | Pending | 2023 |
| ONFLEET 2106975 | Onfleet, Inc. | 9 Electronics42 Science | Pending | 2021 |
| ONFLY 2017652 | Smartek Ltd. | 9 Electronics35 Advertising | Pending | 2020 |
| ONFLY 2017651 · design | Smartek Ltd. | 9 Electronics35 Advertising | Pending | 2020 |
| ONFLOW 1985054 | Dapper Labs Inc. | 9 Electronics35 Advertising42 Science | Pending | 2019 |
| ONEVALLEY 2143103 · TMA1185489 | OneValley, Inc. | 35 Advertising36 Finance41 Education+2 | Registered | 2023 |
| ONEPLANET 2132654 · TMA1195832 · design | CS International Trading Inc. | 21 Housewares | Registered | 2023 |
| ONEBLADE 2232812 · TMA1243380 | an individual | 8 Hand | Registered | 2024 |
| ONEPULSE 2197785 · TMA1223224 | Startpulsing Limited | 35 Advertising42 Science | Registered | 2024 |
| Onfleril 2141194 · TMA1193873 | MICROBIO CO. LTD. | 5 Pharmaceuticals | Registered | 2023 |
| OENOBIOL 2073693 · TMA1203832 | an individual | 3 Cosmetics5 Pharmaceuticals35 Advertising | Registered | 2023 |