| OSTAC 0642471 · TMA385131 | Esteve Pharmaceuticals GmbH | 5 Pharmaceuticals | Registered | 1991 |
| OCTACOL 1783780 · TMA1060370 | an individual | 5 Pharmaceuticals | Registered | 2019 |
| Ostazt 1989828 · TMA1130357 | Shenzhen Yinuo Technology Co. Ltd. | 9 Electronics | Registered | 2022 |
| Ostazt 1984213 · TMA1130281 | Shenzhen Yinuo Technology Co. Ltd. | 20 Furniture | Registered | 2022 |
| Ostazt 1984211 · TMA1130280 | Shenzhen Yinuo Technology Co. Ltd. | 6 Metal | Registered | 2022 |
| OSTASE 0874016 · TMA516904 | HYBRITECH INCORPORATED | 5 Pharmaceuticals | Registered | 1999 |
| OSTECH 2332558 · design | an individual | 31 Fresh | Pending | 2024 |
| OctaCoil 2068831 · TMA1280252 | SE Therapies Ltd. | 10 Medical | Registered | 2025 |
| OCTAGON 2030316 · TMA1165356 | Interprovincial Cooperative Limited | 5 Pharmaceuticals | Registered | 2023 |
| OCTAGON 1657175 · TMA950089 | Zuffa, LLC | 9 Electronics | Registered | 2016 |
| OCTAGON 1657174 · TMA951982 · design | Zuffa, LLC | 9 Electronics | Registered | 2016 |
| OCTAGON 1606986 · TMA874320 | Barboursville Winery Inc. | 33 Wine | Registered | 2014 |
| OCTAGON 1521127 · TMA838855 | Apollo Healthcare Corp. | 3 Cosmetics5 Pharmaceuticals | Registered | 2012 |
| OCTAGON 1455153 · TMA888307 | Zuffa LLC a limited liability company organized under the laws of the state of Nevada | 25 Clothing41 Education | Registered | 2014 |
| OCTAGON 1360316 · TMA776486 | an individual | 35 Advertising36 Finance41 Education | Registered | 2010 |
| OCTAGON 1331383 · TMA758123 | Accenture Global Services Limited | 9 Electronics35 Advertising42 Science | Registered | 2010 |
| OCTAGON 1006818 · TMA530601 | BITZER KÜHLMASCHINENBAU GMBH | 7 Machines11 Lighting | Registered | 2000 |
| OCTAGON 2354993 | RUD Ketten Rieger & Dietz GmbH u. Co. KG | 6 Metal8 Hand9 Electronics | Pending | 2024 |
| OKTAGON 2347852 | RUD Ketten Rieger & Dietz GmbHu. Co. KG | 6 Metal8 Hand9 Electronics+2 | Pending | 2024 |
| OCTAGON 2250217 | Keola Power Technology (Shanghai) Co. ltd. | 9 Electronics12 Vehicles | Pending | 2023 |
| OsteoCool 1820852 · TMA1069789 | Medtronic Holding Company Sàrl | 10 Medical | Registered | 2020 |
| OCTOSTACK 2356345 | OctoML, Inc. | 9 Electronics | Pending | 2024 |
| OihcDosff 2250734 · TMA1276080 | Shenzhen Color Bag E-Commerce Co. Ltd | 11 Lighting | Registered | 2024 |
| OQTIQ 2249305 · TMA1268656 | Owner not listed | 9 Electronics | Registered | 2024 |
| OsteoSync 2213391 · TMA1232935 | SMED-TA/TD, LLC | 10 Medical | Registered | 2024 |