| Ortsoon 2245277 · TMA1264389 | Huizhou Xinxiao Network Technology Co. Ltd | 21 Housewares | Registered | 2024 |
| ORTHUS 2240319 · TMA1234028 | DYZE DESIGN INC. | 9 Electronics | Registered | 2024 |
| ORDSPONO 2210806 · TMA1244178 | REGENERON PHARMACEUTICALS, INC. | 5 Pharmaceuticals | Registered | 2024 |
| ORTIZAN 2207899 · TMA1274242 · design | an individual | 9 Electronics | Registered | 2024 |
| ORTECO 2192499 · TMA1278916 | Owner not shown | 7 Machines12 Vehicles | Registered | 2024 |
| ORTHOCOMFOOT 2191961 · TMA1254939 · design | an individual | 25 Clothing | Registered | 2024 |
| ORTHOSEARCH 2139810 · TMA1219761 | The British Editorial Society of Bone and Joint Surgery | 9 Electronics41 Education42 Science | Registered | 2024 |
| Orthogon 2011638 · TMA1199782 | Frequentis Orthogon GmbH | 9 Electronics35 Advertising37 Construction+1 | Registered | 2023 |
| ORTHOCAST 1950884 · TMA1187991 | Dr. Amit Atrey Professional Corporation | 38 Telecommunications41 Education | Registered | 2023 |
| ORTHOSIT 1944336 · TMA1103445 | an individual | 5 Pharmaceuticals10 Medical | Registered | 2021 |
| ORITESSE 1812684 · TMA1027024 | AbbVie Inc. | 5 Pharmaceuticals | Registered | 2019 |
| ORTHOACCEL 1770235 · TMA975605 | ORTHOACCEL HOLDINGS, LLC | 10 Medical | Registered | 2017 |
| ORTHEX 1766465 · TMA960528 | Orthex Canada Inc. | 10 Medical35 Advertising40 Treatment | Registered | 2017 |
| ORTHOSMILES 1765897 · TMA1004055 · design | ORTHOSMILES HOLDING COMPANY | 3 Cosmetics5 Pharmaceuticals9 Electronics+10 | Registered | 2018 |
| ORTHOSMILES 1765896 · TMA1004056 | ORTHOSMILES HOLDING COMPANY | 3 Cosmetics5 Pharmaceuticals9 Electronics+10 | Registered | 2018 |
| ORATEX 1740884 · TMA961014 | an individual | 1 Chemicals16 Paper17 Rubber | Registered | 2017 |
| ORTHOSTYLE 1727531 · TMA967380 | Dr. Larry Podolsky Dental Corporation | 3 Cosmetics41 Education44 Medical | Registered | 2017 |
| ORTHOACCEL 1694199 · TMA945987 | ORTHOACCEL HOLDINGS, LLC | 42 Science | Registered | 2016 |
| ORTEGA 1651033 · TMA1009417 | B&G FOODS NORTH AMERICA, INC. a legal entity | 29 Meat30 Coffee | Registered | 2018 |
| ORTEGA 1651028 · TMA1064359 · design | B&G FOODS NORTH AMERICA, INC. a legal entity | 30 Coffee | Registered | 2019 |
| ORTHEES 1635979 · TMA944381 | Handi-Craft Company | 10 Medical | Registered | 2016 |
| orthoganic 1635787 · TMA1028764 | Bio Tech Sport Solution GmbH | 25 Clothing35 Advertising | Registered | 2019 |
| ORTHOSONIC 1585676 · TMA954299 | SmileSonica Inc. | 10 Medical35 Advertising44 Medical | Registered | 2016 |
| ORTSBO 1538317 · TMA849892 | Ortsbo, Inc. | 9 Electronics41 Education | Registered | 2013 |
| ORTHOKINE 1495074 · TMA832809 | an individual | 3 Cosmetics5 Pharmaceuticals10 Medical | Registered | 2012 |