| OPENTEC 1766045 · TMA1030049 | Owner not shown | 6 Metal | Registered | 2019 |
| OPENTAP 1958105 · TMA1220061 · design | Keysight Technologies, Inc. | 9 Electronics42 Science | Registered | 2024 |
| OPENTAP 1943549 · TMA1220060 | Keysight Technologies, Inc. | 9 Electronics42 Science | Registered | 2024 |
| OPENTEX 1911525 · TMA1121962 · design | an individual | 10 Medical | Registered | 2022 |
| OPENTOK 1507448 · TMA862787 | TokBox, Inc. | 38 Telecommunications | Registered | 2013 |
| OpenTAS 1373485 · TMA784168 | Implico Holding GmbH | 9 Electronics20 Furniture27 Carpets+2 | Registered | 2010 |
| Opentek 2367291 | Opentek.ca Computing Solutions Incorporated | 37 Construction42 Science | Pending | 2024 |
| OPENTOUCH 1595765 · TMA934815 | Owner not shown | 9 Electronics38 Telecommunications | Registered | 2016 |
| OPENTOUCH 1514795 · TMA935482 | Owner not shown | 9 Electronics | Registered | 2016 |
| Openatey 2216098 · TMA1245393 | Guangzhou Kexing Trading Co., Ltd. | 25 Clothing | Registered | 2024 |
| OPENTIME 2004856 · TMA1264875 | an individual | 42 Science | Registered | 2024 |
| OPENTEMP 1999111 · TMA1258825 · design | Opentemp Recruiting Inc. | 9 Electronics35 Advertising | Registered | 2024 |
| OPENDOCK 1915419 · TMA1093603 | OpenDock, LLC | 42 Science | Registered | 2021 |
| OPENTUBE 1901257 · TMA1128775 | Amazon Technologies, Inc. | 9 Electronics35 Advertising38 Telecommunications+3 | Registered | 2022 |
| OpenTour 1883343 · TMA1063979 | GITI TIRE PTE. LTD. a private limited company organized under the laws of Singapore | 12 Vehicles | Registered | 2019 |
| OPENTELL 1681209 · TMA913594 | InMoment, Inc. | 35 Advertising | Registered | 2015 |
| OPENATOM 2104725 · design | OPENATOM FOUNDATION | 9 Electronics35 Advertising36 Finance+3 | Pending | 2020 |
| OVENTE 1981564 · TMA1116537 | Topnet, Inc. | 7 Machines11 Lighting20 Furniture+1 | Registered | 2021 |
| OVENTUS 1956541 · TMA1165175 | OPEN AIRWAY DENTAL SOLUTIONS LTD. | 10 Medical40 Treatment | Registered | 2023 |
| OPENID 1727604 · TMA1059867 | Open ID Foundation | 35 Advertising41 Education42 Science | Registered | 2019 |
| OPENDO 1540461 · TMA885738 | an individual | 9 Electronics16 Paper35 Advertising+4 | Registered | 2014 |
| opendi 1513427 · TMA833549 | an individual | 35 Advertising41 Education | Registered | 2012 |
| OPENID 1325418 · TMA710722 | OpenID Foundation | 42 Science | Registered | 2008 |
| OPUNTIA 2368466 | Owner not shown | 3 Cosmetics | Pending | 2024 |
| OPENOTP 2297469 · design | Owner not listed | 9 Electronics42 Science | Pending | 2023 |