| OPALCLOTH 1681256 · TMA1032739 | Best Film Service Inc. | 24 Textiles | Registered | 2019 |
| OPALIX 1611442 · TMA919921 | Owner not shown | 11 Lighting37 Construction40 Treatment | Registered | 2015 |
| OPALUSTRE 1045459 · TMA561525 | ULTRADENT PRODUCTS, INC. A UTAH CORPORATION | 3 Cosmetics5 Pharmaceuticals10 Medical | Registered | 2002 |
| OPALESCENCE 0768502 · TMA468525 | ULTRADENT PRODUCTS, INC. A CORPORATION OF UTAH | 3 Cosmetics | Registered | 1997 |
| OPALESCENCE 0673319 · TMA409375 | ULTRADENT PRODUCTS, INC. | 3 Cosmetics | Registered | 1993 |
| OHFULLS 2231155 · TMA1256534 | Shenzhen Oufos Trading Co. LTD | 11 Lighting | Registered | 2024 |
| OVLUX 2211801 · TMA1243019 | an individual | 8 Hand9 Electronics11 Lighting | Registered | 2024 |
| OPLIXEL 2138210 · TMA1206195 | an individual | 1 Chemicals5 Pharmaceuticals | Registered | 2023 |
| OPLXS 2105395 · TMA1189587 | an individual | 28 Toys | Registered | 2023 |
| OBLIX 2082213 · TMA1208303 · design | Azumi Limited | 43 Restaurants | Registered | 2023 |
| OBELISK 2073442 · TMA1190457 | SHENZHEN GEEKVAPE TECHNOLOGY CO. LTD. | 34 Tobacco | Registered | 2023 |
| OPULUS 2042673 · TMA1190366 | REA Innovations, Inc. | 3 Cosmetics21 Housewares | Registered | 2023 |
| OVALUX 1948920 · TMA1136992 | Gammalux Lighting Systems Inc. | 11 Lighting | Registered | 2022 |
| OPULUX 1904861 · TMA1089433 | The Dow Chemical Company | 1 Chemicals | Registered | 2020 |
| OPLAGTRI 1873767 · TMA1057770 | BRISTOL-MYERS SQUIBB COMPANY (A DELAWARE CORPORATION) | 5 Pharmaceuticals | Registered | 2019 |
| OPALHOUSE 1853957 · TMA1079780 · design | Target Brands, Inc. | 16 Paper21 Housewares | Registered | 2020 |
| OPALHOUSE 1853956 · TMA1076532 · design | Target Brands, Inc. | 6 Metal14 Jewellery20 Furniture+1 | Registered | 2020 |
| OPALHOUSE 1853955 · TMA1076538 · design | Target Brands, Inc. | 19 Building | Registered | 2020 |
| OPALHOUSE 1853954 · TMA1081208 · design | Target Brands, Inc. | 18 Leather | Registered | 2020 |
| OPALHOUSE 1853953 · TMA1076540 · design | Target Brands, Inc. | 6 Metal | Registered | 2020 |
| OPALHOUSE 1853952 · TMA1079772 · design | Target Brands, Inc. | 16 Paper20 Furniture | Registered | 2020 |
| OPALHOUSE 1853951 · TMA1076533 · design | Target Brands, Inc. | 14 Jewellery | Registered | 2020 |
| OPALHOUSE 1853950 · TMA1081205 · design | Target Brands, Inc. | 11 Lighting | Registered | 2020 |
| OPALHOUSE 1853949 · TMA1079268 · design | Target Brands, Inc. | 8 Hand21 Housewares | Registered | 2020 |
| OPALHOUSE 1853948 · TMA1081202 · design | Target Brands, Inc. | 4 Oils | Registered | 2020 |