| OxyFlora 2294563 | Hecto Healthcare Co. Ltd. | 5 Pharmaceuticals | Pending | 2023 |
| OZIFLOW 2211180 | Oziflow International Pty Ltd | 20 Furniture | Pending | 2022 |
| OXYBLOCK 1819291 · TMA1061722 | Log Plastic Products Company (1993) Ltd. | 21 Housewares | Registered | 2019 |
| OXYBLOOM 1394457 · TMA762150 | Blue Planet Environmental Inc. | 11 Lighting | Registered | 2010 |
| OXYPLUS 1286650 · TMA689975 · design | SOUTHMEDIC INCORPORATED | 10 Medical | Registered | 2007 |
| OXYFILL 0798520 · TMA485299 | CHAD THERAPEUTICS, INC. | 10 Medical | Registered | 1997 |
| OCUFLOX 0713118 · TMA446389 | AbbVie Corporation | 5 Pharmaceuticals | Registered | 1995 |
| OXPLO 2342748 · design | Shandong Luyu International Trade Co. LTD | 7 Machines12 Vehicles | Pending | 2024 |
| OXYFUEL 0917930 | SASKATCHEWAN POWER CORPORATION | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 2006 |
| OJPLAND 2219894 · TMA1246992 | SUNNY BEST TRADING LIMITED | 22 Ropes | Registered | 2024 |
| OxBalance 2189539 · TMA1280741 | OQ Chemicals GmbH | 1 Chemicals | Registered | 2025 |
| OcuBlink 1907786 · TMA1078359 | OcuBlink Inc | 42 Science | Registered | 2020 |
| OCUBLUE 1834323 · TMA1045890 | Prairie Naturals Health Products Inc. | 5 Pharmaceuticals | Registered | 2019 |
| OXYBUL 1808479 · TMA1020405 · design | Owner not shown | 5 Pharmaceuticals16 Paper19 Building+5 | Registered | 2019 |
| OXYBUL 1808478 · TMA1020483 | Owner not shown | 5 Pharmaceuticals16 Paper19 Building+5 | Registered | 2019 |
| OGIVAL 1750917 · TMA1019242 · design | TINO'S INVESTMENT CO. LTD. | 14 Jewellery | Registered | 2019 |
| OXYBLAST 1739717 · TMA1044241 | Owner not shown | 1 Chemicals4 Oils7 Machines+5 | Registered | 2019 |
| OCPHYL 1651984 · TMA893755 | FINCHLEY RESEARCH & DEVELOPMENT INC. | 5 Pharmaceuticals | Registered | 2015 |
| OXYPAL 1584951 · TMA849325 · design | Essential Water Solutions Inc. | 1 Chemicals | Registered | 2013 |
| OXBALL 1418343 · TMA858697 | Oxane Materials, Inc. | 1 Chemicals | Registered | 2013 |
| OceaPoly 1412028 · TMA807356 | BLRP, LLC | 17 Rubber | Registered | 2011 |
| OSSEOPLASTY 1410602 · TMA847078 | Merit Medical Systems, Inc. | 5 Pharmaceuticals10 Medical35 Advertising+2 | Registered | 2013 |
| OSSEOFLEX 1410499 · TMA808046 | Merit Medical Systems, Inc. | 10 Medical | Registered | 2011 |
| OSSEOPULSE 1390884 · TMA752767 | Biolux Research Ltd. | 10 Medical | Registered | 2009 |
| OXIPLEX 1243667 · TMA656956 | FzioMed, Inc. | 5 Pharmaceuticals | Registered | 2006 |