| OPENSPIRIT 0885397 · TMA549474 · design | Cloud Software Group, Inc. | 9 Electronics | Registered | 2001 |
| OPENSAFE 2131045 · TMA1239471 | SHOKZ HOLDING LIMITED | 10 Medical | Registered | 2024 |
| OPENSPORT 2101702 · TMA1173887 | SHOKZ (SINGAPORE) PTE. LTD. | 9 Electronics | Registered | 2023 |
| openswim 2056371 · TMA1198550 | SHOKZ (SINGAPORE) PTE. LTD. | 9 Electronics | Registered | 2023 |
| OPENWHISK 1798349 · TMA1056029 | The Apache Software Foundation | 9 Electronics38 Telecommunications42 Science | Registered | 2019 |
| OPENSHARE 1609719 · TMA893368 | ONCARD MARKETING, INC. DBA REVTRAX | 35 Advertising42 Science | Registered | 2015 |
| OPENSET 1393974 · TMA755566 | Owner not shown | 9 Electronics | Registered | 2009 |
| OPENSENTIENT 2297103 | SENTIENT MACHINE HOLDINGS CORPORATION, operating through its division OPENSENTIENT INSTITUTE | 42 Science | Pending | 2023 |
| OPENSOUND 2151099 · TMA1221351 · design | SHOKZ (SINGAPORE) PTE. LTD. | 9 Electronics | Registered | 2024 |
| OpenWick 2134945 · TMA1212066 | Fil-Tec, Inc. | 3 Cosmetics4 Oils | Registered | 2023 |
| opensnow 2132268 · TMA1232143 | SHOKZ (SINGAPORE) PTE. LTD. | 9 Electronics | Registered | 2024 |
| openspeed 2132262 · TMA1232141 | SHOKZ (SINGAPORE) PTE. LTD. | 9 Electronics | Registered | 2024 |
| OPENSEE 2106460 · TMA1268237 | OPENSEE | 9 Electronics35 Advertising36 Finance+1 | Registered | 2024 |
| OPENSEA 2099944 · TMA1201319 | Greensea Systems, Inc. | 9 Electronics | Registered | 2023 |
| OpenStage 2097913 · TMA1272365 | Liebherr-Hausgeräte GmbH | 11 Lighting | Registered | 2024 |
| opensrci 1990414 · TMA1126966 | an individual | 36 Finance | Registered | 2022 |
| OPENSEA 1945585 · TMA1223347 | Ozone Networks, Inc. | 35 Advertising42 Science | Registered | 2024 |
| OPENSKY 1915772 · TMA1106868 | Wing Aviation LLC | 9 Electronics12 Vehicles39 Transport+1 | Registered | 2021 |
| OPENCAST 1910774 · TMA1090134 | OPENM INC. | 10 Medical | Registered | 2020 |
| OPENSKY 1813861 · TMA995132 | Corteva Agriscience LLC | 5 Pharmaceuticals | Registered | 2018 |
| OPENSURE 1771418 · TMA1032251 | Boston Scientific Scimed, Inc. | 10 Medical | Registered | 2019 |
| OPENSPACE 1702991 · TMA928586 | LOGIX ITS INC. | 9 Electronics19 Building | Registered | 2016 |
| OPENSTACK 1697565 · TMA975142 | OpenStack Foundation, a non-stock, non profit corporation | 35 Advertising41 Education | Registered | 2017 |
| OPENEST 1665028 · TMA921796 | HAWORTH, INC. | 20 Furniture | Registered | 2015 |
| OPENSWAN 1559719 · TMA873857 · design | Xelerance Corporation | 9 Electronics42 Science | Registered | 2014 |