| OGEEFAJA 2191872 · TMA1234766 · design | Karcher, Inc. | 25 Clothing | Registered | 2024 |
| OZBOX 2190120 · TMA1233678 | an individual | 29 Meat30 Coffee31 Fresh | Registered | 2024 |
| OgopogoLand 1928290 · TMA1106659 | an individual | 35 Advertising | Registered | 2021 |
| Ogopogo 1926046 · TMA1106466 | an individual | 35 Advertising | Registered | 2021 |
| OXBOX 1924738 · TMA1148482 | Trane International Inc. a legal entity | 11 Lighting37 Construction42 Science | Registered | 2022 |
| OGBC 1864824 · TMA1072311 | Cronos Group Inc. | 5 Pharmaceuticals9 Electronics14 Jewellery+12 | Registered | 2020 |
| OGBC 1864823 · TMA1072305 · design | Cronos Group Inc. | 5 Pharmaceuticals9 Electronics14 Jewellery+12 | Registered | 2020 |
| OZZYBOOSTER 1778321 · TMA975689 | CRC Industries, Inc. | 1 Chemicals | Registered | 2017 |
| OZEVICA 1777476 · TMA996671 | Celgene Corporation | 5 Pharmaceuticals | Registered | 2018 |
| OxiPhos 1727058 · TMA966004 | BIOSAFE SYSTEMS LLC | 5 Pharmaceuticals | Registered | 2017 |
| OXYFUSION 1706298 · TMA1063804 | BIOSAFE SYSTEMS LLC | 7 Machines40 Treatment | Registered | 2019 |
| OXYPAS 1699074 · TMA952550 | an individual | 9 Electronics25 Clothing | Registered | 2016 |
| OOKPIX 1647844 · TMA927857 · design | West Canadian Digital Imaging Inc. | 6 Metal9 Electronics14 Jewellery+11 | Registered | 2016 |
| OXAPEX 1647815 · TMA1028640 · design | First Gain International Limited | 1 Chemicals5 Pharmaceuticals9 Electronics+7 | Registered | 2019 |
| OCPX 1623087 · TMA908708 | RZIM Zacharias Trust | 41 Education45 Legal | Registered | 2015 |
| OKUVISION 1613917 · TMA925842 | OKUVISION GMBH | 9 Electronics10 Medical44 Medical | Registered | 2016 |
| OxyBAC 1579963 · TMA917641 | SC Johnson Professional CA Inc. | 3 Cosmetics5 Pharmaceuticals | Registered | 2015 |
| OSPHOS 1568449 · TMA909741 | Dechra Limited | 5 Pharmaceuticals | Registered | 2015 |
| OKBG 1554969 · TMA972611 | OSHKOSH B'GOSH, INC. | 25 Clothing | Registered | 2017 |
| OZPIG 1482302 · TMA851257 · design | Adventure Trading Australia Pty Ltd | 11 Lighting | Registered | 2013 |
| OXIBIS 1218512 · TMA655383 | Owner not shown | 9 Electronics | Registered | 2005 |
| OxBiz 1099567 · TMA576778 | OPGI Management GP Inc./Gestion OPGI GP Inc. as general partner for OPGI Management Limited Partnership | 9 Electronics36 Finance37 Construction+1 | Registered | 2003 |
| OCBC 0866813 · TMA564191 | OVERSEA-CHINESE BANKING CORPORATION LIMITED | 35 Advertising36 Finance42 Science | Registered | 2002 |
| OXOPOCETINE 0827721 · TMA500790 | COVEX, S.A. A SPANISH COMPANY | 5 Pharmaceuticals | Registered | 1998 |
| OSPIKA 0811695 · TMA487096 | OSPIKA LATH & PRE-CUT LTD. | 19 Building | Registered | 1997 |