| OPROVDA 2210023 · TMA1229668 | Global Blood Therapeutics, Inc. | 5 Pharmaceuticals | Registered | 2024 |
| OVERPOWER 2148623 · TMA1203112 | BMG & Associates LLC (a Delaware limited liability company) | 28 Toys | Registered | 2023 |
| OBRAPRO 2140770 · TMA1200298 | an individual | 37 Construction | Registered | 2023 |
| OPROplus 1986349 · TMA1138274 | OPRO INTERNATIONAL LIMITED | 9 Electronics | Registered | 2022 |
| overbest 1907237 · TMA1089077 | Qingdao Ecopure Filter Co. Ltd | 11 Lighting | Registered | 2020 |
| OBRAVDI 1881473 · TMA1070703 | Eisai R&D Management Co. Ltd. | 5 Pharmaceuticals | Registered | 2020 |
| OVERPIPE 1880904 · TMA1105203 | an individual | 9 Electronics20 Furniture | Registered | 2021 |
| OVERHOP 1866841 · TMA1073276 | OverHop Brewing Corp. | 16 Paper21 Housewares25 Clothing+2 | Registered | 2020 |
| OVERFINCH 1823567 · TMA1078777 | Overfinch International Limited | 14 Jewellery18 Leather25 Clothing | Registered | 2020 |
| OPREVITA 1746853 · TMA1035771 | Cell Cure Neurosciences Ltd. | 5 Pharmaceuticals | Registered | 2019 |
| OFFERUP 1726552 · TMA1035143 | OfferUp Inc. | 9 Electronics35 Advertising38 Telecommunications | Registered | 2019 |
| OBREFCO 1689651 · TMA1048598 | BRISTOL-MYERS SQUIBB COMPANY (A DELAWARE CORPORATION) | 5 Pharmaceuticals | Registered | 2019 |
| ObeyYourBody 1586020 · TMA889562 | an individual | 3 Cosmetics35 Advertising | Registered | 2014 |
| OVERFINCH 1563192 · TMA910367 | Overfinch International Limited | 7 Machines9 Electronics12 Vehicles+4 | Registered | 2015 |
| OVERFLOW 1547068 · TMA865990 | The Overflow.com, Inc. | 16 Paper25 Clothing35 Advertising+1 | Registered | 2013 |
| OPROFIN 1427911 · TMA817198 | OPRO INTERNATIONAL LIMITED | 28 Toys | Registered | 2012 |
| OBERFLEX 1366462 · TMA746365 | Owner not shown | 19 Building | Registered | 2009 |
| OPERAPRIMA 2286456 | an individual | 7 Machines | Pending | 2023 |
| OFFERUP 2273748 | OfferUp Inc. | 9 Electronics35 Advertising36 Finance+1 | Pending | 2023 |
| OPAIRVI 2182655 | Actelion Pharmaceuticals Ltd. | 5 Pharmaceuticals | Pending | 2022 |
| OPREVECT 2182623 | Elanco US Inc. | 5 Pharmaceuticals | Pending | 2022 |
| OVERFLOW 2157015 | Overflow App Inc. | 36 Finance42 Science | Pending | 2021 |
| OPERAPRO 2147844 | an individual | 7 Machines9 Electronics11 Lighting | Pending | 2021 |
| OVERBAY 2007897 | Overbay Capital Partners Inc. | 36 Finance | Pending | 2020 |