| OCERA 1793554 · TMA1038886 | Ocera Therapeutics, Inc. | 5 Pharmaceuticals | Registered | 2019 |
| OCERA 1333425 · TMA748181 | Ocera Therapeutics, Inc. | 5 Pharmaceuticals | Registered | 2009 |
| OCR 1749607 · TMA953907 · design | Outbreak Control and Remediation Management Group Inc. | 37 Construction | Registered | 2016 |
| OCR 0839925 · TMA548408 | Ritchey Design, Inc. a Nevada corporation | 12 Vehicles | Registered | 2001 |
| OCRI 2249631 | Owner not shown | 41 Education45 Legal | Pending | 2023 |
| OZORA 1813315 · TMA1061719 | Linde GmbH | 11 Lighting | Registered | 2019 |
| OCREE 2348411 | Ocree Corporation | 9 Electronics35 Advertising36 Finance+1 | Pending | 2024 |
| OCHRE 2348019 | Ailbo Group Limited | 45 Legal | Pending | 2024 |
| OXERA 2258463 · design | Owner not listed | 9 Electronics16 Paper35 Advertising+4 | Pending | 2022 |
| OXERA 2231894 | Oxera Consulting LLP | 9 Electronics35 Advertising36 Finance+2 | Pending | 2022 |
| OXERA 2195439 | Oxera Consulting LLP | 16 Paper35 Advertising42 Science+1 | Pending | 2022 |
| OCCAR 0974529 · design | ORGANISATION FOR JOINT ARMAMENT CO-OPERATION / ORGANISATION CONJOINTE DE COOPÉRATION EN MATIÈRE D'ARMEMENT | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 2001 |
| OCCAR 0974528 | ORGANISATION FOR JOINT ARMAMENT CO-OPERATION / ORGANISATION CONJOINTE DE COOPÉRATION EN MATIÈRE D'ARMEMENT | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 2022 |
| OCCER 2261784 · TMA1281290 | Guangzhou Ruiyi Information Technology Co. Ltd. | 9 Electronics | Registered | 2025 |
| OGORI 2227036 · TMA1251380 | Shen Zhen Ai Pin Gou Network Technology Limited Company | 8 Hand | Registered | 2024 |
| OZERO 2212411 · TMA1183272 · design | Shenzhen Hongfuya Trade Co. Ltd | 9 Electronics21 Housewares25 Clothing+1 | Registered | 2023 |
| Osoeri 2204955 · TMA1236473 | Shenzhen Hailingchuan Technology Co. Ltd. | 12 Vehicles | Registered | 2024 |
| Osoeri 2204946 · TMA1236472 | Shenzhen Hailingchuan Technology Co. Ltd. | 9 Electronics | Registered | 2024 |
| Osoeri 2194868 · TMA1236086 | Shenzhen Hailingchuan Technology Co. Ltd. | 11 Lighting | Registered | 2024 |
| Ouker 2187804 · TMA1232630 | an individual | 28 Toys | Registered | 2024 |
| OGROW 2142882 · TMA1202817 | KSH BRANDS LLC | 6 Metal | Registered | 2023 |
| OUGARE 2102353 · TMA1188401 | an individual | 25 Clothing | Registered | 2023 |
| OSR 2083770 · TMA1212901 · design | ORIND SPECIAL REFRACTORIES PVT. LTD. | 19 Building | Registered | 2023 |
| OJIRRU 2068974 · TMA1164650 | an individual | 9 Electronics18 Leather25 Clothing | Registered | 2023 |
| OZERI 2064480 · TMA1282166 | Commonpath LLC dba Ozeri | 7 Machines8 Hand9 Electronics+4 | Registered | 2025 |