| OVASSURE 2261554 · TMA1281239 | Dr. Clifford Librach Medicine Professional Corporation | 44 Medical | Registered | 2025 |
| OBSKUR 2250326 · TMA1266033 | Owner not listed | 9 Electronics42 Science | Registered | 2024 |
| OFSR 2248648 · TMA1263296 | OFFSHORE SNOW SHAPES LLC | 28 Toys | Registered | 2024 |
| OIVGGUR 2222302 · TMA1248755 | Xiamen Boerman Washing Service Co., Ltd. | 20 Furniture | Registered | 2024 |
| OBSCURA 2142438 · TMA1214346 | EASTON DIAMOND SPORTS, LLC | 28 Toys | Registered | 2023 |
| OFFSHORE 2124388 · TMA1177909 | MARK ANTHONY GROUP INC. | 33 Wine | Registered | 2023 |
| OBZERVR 2105041 · TMA1173905 · design | Obzervr Pty Ltd | 9 Electronics35 Advertising42 Science | Registered | 2023 |
| Off2Curling 2093069 · TMA1171390 | an individual | 21 Housewares25 Clothing | Registered | 2023 |
| OBCURSCO 2043063 · TMA1283887 | JEAXSTORE INC | 11 Lighting22 Ropes | Registered | 2025 |
| OBCURSCO 2043062 · TMA1283886 · design | JEAXSTORE INC | 11 Lighting22 Ropes | Registered | 2025 |
| OPPCHARGE 2002028 · TMA1213866 | an individual | 9 Electronics37 Construction | Registered | 2023 |
| OPICRO 1940113 · TMA1121971 | Corteva Agriscience LLC | 5 Pharmaceuticals | Registered | 2022 |
| OBSERVERLIVE 1919519 · TMA1103544 | Viavi Solutions Inc. | 42 Science | Registered | 2021 |
| OBSERVE 1904468 · TMA1093914 · design | Toyo Tire Corporation | 12 Vehicles | Registered | 2021 |
| OPISURE 1894432 · TMA1101039 | an individual | 5 Pharmaceuticals | Registered | 2021 |
| OBSERVATOIRE 360 1887942 · TMA1094198 | 9145-4090 QUÉBEC INC. | 35 Advertising41 Education | Registered | 2021 |
| OPZERLAG 1872452 · TMA1073786 | BRISTOL-MYERS SQUIBB COMPANY (A DELAWARE CORPORATION) | 5 Pharmaceuticals | Registered | 2020 |
| OPPCHARGE 1778274 · TMA1023116 · design | an individual | 9 Electronics37 Construction | Registered | 2019 |
| OPSIRIA 1774579 · TMA1034089 | SANTEN PHARMACEUTICAL CO. LTD. | 5 Pharmaceuticals | Registered | 2019 |
| OBSCURA 1705317 · TMA968020 | an individual | 17 Rubber22 Ropes | Registered | 2017 |
| OPSERV 1705178 · TMA931827 | Cognizant Technology Solutions U.S. Corporation | 9 Electronics35 Advertising42 Science | Registered | 2016 |
| OBIZUR 1673284 · TMA983062 | Baxalta Incorporated | 5 Pharmaceuticals | Registered | 2017 |
| OBSERVER 1574466 · TMA858416 | Carrier Corporation | 9 Electronics11 Lighting | Registered | 2013 |
| OBSERVA 1530833 · TMA835806 | an individual | 35 Advertising36 Finance45 Legal | Registered | 2012 |
| OFFSHORE 1519191 · TMA898346 | PENNWELL CORPORATION | 9 Electronics | Registered | 2015 |