| OBLO 1665034 · TMA1033155 | Owner not shown | 11 Lighting | Registered | 2019 |
| OBOL 1592940 · TMA870273 | Owner not shown | 21 Housewares | Registered | 2014 |
| OBLO 1472670 · TMA845278 | Owner not shown | 28 Toys | Registered | 2013 |
| OBLA 2359753 · design | an individual | 25 Clothing | Pending | 2024 |
| OBEL 2223059 · design | an individual | 5 Pharmaceuticals | Pending | 2022 |
| OBOL 2206709 | The Obol Association | 9 Electronics36 Finance42 Science | Pending | 2022 |
| OVL 2109058 · TMA1175118 · design | Shenzhen Eigate Technology Co. Ltd. | 34 Tobacco | Registered | 2023 |
| OBELA 1846539 · TMA1035543 · design | PepsiCo-Strauss Fresh Dips & Spreads International GmbH | 29 Meat30 Coffee | Registered | 2019 |
| OBALL 1205399 · TMA650695 | GOT I, LLC | 9 Electronics | Registered | 2005 |
| Oball 2347078 · design | Zhejiang Xiangjie Biotechnology Co. Ltd. | 21 Housewares | Pending | 2024 |
| OOBLI 2240980 | Oobli, Inc. | 5 Pharmaceuticals29 Meat30 Coffee+2 | Pending | 2023 |
| OPELLO 2138771 · TMA1214242 | an individual | 5 Pharmaceuticals | Registered | 2023 |
| Ofeily 2101700 · TMA1190576 | Shenzhenshi Zhuoyuexin Network Technology Co.Ltd | 25 Clothing | Registered | 2023 |
| OPHELIE 2052412 · TMA1283910 | CRÉATIVAXION TI INC. | 42 Science | Registered | 2025 |
| OPOULE 2043987 · TMA1182418 | REA Innovations, Inc. | 3 Cosmetics | Registered | 2023 |
| OPHELIA 2043640 · TMA1265181 | Delta Faucet Company | 11 Lighting | Registered | 2024 |
| OBELLE 2027464 · TMA1159946 | The Ritz-Carlton Hotel Company, L.L.C. | 43 Restaurants | Registered | 2023 |
| OPAL 2025062 · TMA1212804 | Haier US Appliance Solutions, Inc. | 3 Cosmetics11 Lighting | Registered | 2023 |
| OPFEEL 1955742 · TMA1184511 | PROJETCLUB, SA | 9 Electronics18 Leather25 Clothing+1 | Registered | 2023 |
| OPALE 1941451 · TMA1213706 | Owner not shown | 1 Chemicals40 Treatment42 Science | Registered | 2023 |
| OVAL-8 1927676 · TMA1110495 | DIXON TICONDEROGA COMPANY. | 2 Paints | Registered | 2021 |
| ohplay 1907109 · TMA1127897 | SHENZHEN AIRSMART TECHNOLOGY CO. LTD | 9 Electronics35 Advertising38 Telecommunications+1 | Registered | 2022 |
| OPILL 1866245 · TMA1038727 · design | an individual | 5 Pharmaceuticals | Registered | 2019 |
| OVELA 1861111 · TMA1081648 | GLAXO GROUP LIMITED | 5 Pharmaceuticals44 Medical | Registered | 2020 |
| OPHELIA 1850034 · TMA1025095 | Ophelia Financial Technologies Inc. | 36 Finance42 Science | Registered | 2019 |