| OPTICLEAN 1438249 · TMA767828 | BISSELL Inc. | 7 Machines | Registered | 2010 |
| OPTICLEAN 2023624 | Carrier Corporation | 11 Lighting | Pending | 2020 |
| OPTIGEAR 0460654 · TMA259334 | an individual | 4 Oils | Registered | 1981 |
| OPTICLEANSE 1908743 · TMA1094399 | Xymogen IP, LLC | 5 Pharmaceuticals | Registered | 2021 |
| OPTOSELECT 1971641 · TMA1188025 | Bruker Cellular Analysis, Inc. | 9 Electronics42 Science | Registered | 2023 |
| OPTICOOLER 1840895 · TMA1051532 | DoKaSch GmbH Aluminiumverarbeitung Air Cargo Equipment + Repair | 6 Metal11 Lighting20 Furniture+1 | Registered | 2019 |
| optiClient 1080202 · TMA575696 | Siemens Enterprise Communications GmbH & Co. KG | 9 Electronics | Registered | 2003 |
| OptoScreener 1498517 · TMA814966 | Optosecurity Inc. | 9 Electronics | Registered | 2012 |
| OPTICLOSE 2280736 · TMA1243434 | Owner not listed | 5 Pharmaceuticals | Registered | 2024 |
| OPTICEDE 2204392 · TMA1241295 | an individual | 1 Chemicals | Registered | 2024 |
| OPTICOLOR 2152040 · TMA1206356 | LMPG Inc. | 11 Lighting | Registered | 2023 |
| OPTISTAR 2151403 · TMA1247980 | Liebel-Flarsheim Company LLC | 10 Medical | Registered | 2024 |
| OPTICARE 2147833 · TMA1237017 | Owner not shown | 10 Medical20 Furniture | Registered | 2024 |
| OptoSeq 2109958 · TMA1159448 | Berkeley Lights, Inc. | 1 Chemicals | Registered | 2023 |
| OPTICELL 2105312 · TMA1190725 | Medline Industries, LP | 5 Pharmaceuticals | Registered | 2023 |
| OPTIXSTAR 2098116 · TMA1218051 · design | HUAWEI TECHNOLOGIES CO., LTD. | 9 Electronics | Registered | 2024 |
| OPTIXSTAR 2033426 · TMA1221037 · design | HUAWEI TECHNOLOGIES CO., LTD. | 9 Electronics42 Science | Registered | 2024 |
| OPTICALE 2007604 · TMA1146553 · design | an individual | 9 Electronics16 Paper41 Education+1 | Registered | 2022 |
| OpticEye 1984602 · TMA1117443 | an individual | 7 Machines9 Electronics | Registered | 2022 |
| OPTICEL 1950661 · TMA1209229 | Summit Innovation Labs, LLC | 5 Pharmaceuticals | Registered | 2023 |
| OPTICALIA 1855342 · TMA1071839 | an individual | 35 Advertising | Registered | 2020 |
| OPTISAR 1769128 · TMA1049861 | UrtheCast Corp. | 9 Electronics16 Paper35 Advertising+4 | Registered | 2019 |
| OPTICA 1762390 · TMA1032771 · design | Cambridge Associates, LLC | 36 Finance | Registered | 2019 |
| OPTICA 1762389 · TMA1027289 | Cambridge Associates, LLC | 36 Finance | Registered | 2019 |
| OPTISTEAM 1706436 · TMA927493 | Halliburton Energy Services, Inc. | 7 Machines | Registered | 2016 |