| OneLeaf 2198311 · TMA1256401 | Shenzhen Yuandao Technology Co. Ltd. | 21 Housewares | Registered | 2024 |
| Oneleaf 2323172 | Shenzhen Yuandao Technology Co. Ltd. | 22 Ropes | Pending | 2024 |
| Onelfin 2258075 · TMA1279253 | an individual | 26 Sewing | Registered | 2024 |
| Onlyflame 2192370 · TMA1234851 | Dongguan Longyu Technology Co. Ltd. | 11 Lighting | Registered | 2024 |
| Onwelby 2183632 · TMA1186826 | Owner not shown | 5 Pharmaceuticals | Registered | 2023 |
| omlopp 2091481 · TMA1186123 | an individual | 16 Paper | Registered | 2023 |
| onlypuff 2077767 · TMA1202601 | Xiamen Xiangnong Food Co. Ltd. | 25 Clothing | Registered | 2023 |
| ONLYBETTER 2026863 · TMA1157162 · design | an individual | 3 Cosmetics | Registered | 2022 |
| ONLYFANS 2004168 · TMA1147652 | Fenix International Limited | 9 Electronics35 Advertising38 Telecommunications+2 | Registered | 2022 |
| ONLYBIO 2001986 · TMA1148785 · design | Owner not shown | 3 Cosmetics | Registered | 2022 |
| ONE4LIFE 1994476 · TMA1114570 | Britax Child Safety, Inc. | 12 Vehicles | Registered | 2021 |
| Onelap 1962700 · TMA1120927 | Qingdao Magene Intelligence Technology Co.Ltd. | 9 Electronics10 Medical12 Vehicles+8 | Registered | 2022 |
| OMLIVULT 1936268 · TMA1088725 | AMGEN INC. | 5 Pharmaceuticals | Registered | 2020 |
| ONLYFRIDAYS 1925072 · TMA1158495 · design | an individual | 25 Clothing35 Advertising42 Science | Registered | 2022 |
| OMNILAB 1870299 · TMA1083255 | an individual | 9 Electronics10 Medical | Registered | 2020 |
| OMNILIP 1701259 · TMA942466 | Saint-Gobain Performance Plastics Corporation | 17 Rubber | Registered | 2016 |
| ONLIVE 1467647 · TMA826891 | OL2, Inc. | 9 Electronics25 Clothing28 Toys+3 | Registered | 2012 |
| ONLIVE 1464036 · TMA864851 · design | OL2, Inc. | 9 Electronics35 Advertising38 Telecommunications+3 | Registered | 2013 |
| ONLIVE 1442620 · TMA854190 | OL2, Inc. | 45 Legal | Registered | 2013 |
| ONLIVE 1435468 · TMA849569 | OL2, Inc. | 35 Advertising | Registered | 2013 |
| OMELIFE 1430318 · TMA816200 · design | Croda International Plc | 1 Chemicals5 Pharmaceuticals29 Meat | Registered | 2012 |
| ONLYVIEW 1312006 · TMA706302 | Owner not shown | 9 Electronics42 Science | Registered | 2008 |
| ONLIVE 1194407 · TMA756979 | OL2, Inc. | 25 Clothing28 Toys38 Telecommunications+1 | Registered | 2010 |
| ONLEVAYT 2364351 | Corcept Therapeutics Incorporated | 5 Pharmaceuticals | Pending | 2024 |
| Oimlfus 2362635 | Huizhou Weiying E-Commerce Co. Ltd. | 9 Electronics | Pending | 2024 |