| ONTRACK 1765151 · TMA1012906 | PERIMETER 9 INC. | 6 Metal9 Electronics19 Building+3 | Registered | 2019 |
| ONTRACK 1477053 · TMA853573 | KLDiscovery Ontrack, LLC | 9 Electronics35 Advertising38 Telecommunications+2 | Registered | 2013 |
| ONTRACK 1313757 · TMA730031 · design | PERIMETER 9 INC. | 6 Metal19 Building35 Advertising+2 | Registered | 2008 |
| ONTRAK 1925013 · TMA1106356 | Spacelabs Holdings, Inc. | 10 Medical | Registered | 2021 |
| ONTRAPORT 1777131 · TMA983519 | ONTRAPORT, INC. | 35 Advertising40 Treatment42 Science | Registered | 2017 |
| ONETRACK 1467479 · TMA828577 | Crane Payment Innovations, Inc. | 9 Electronics | Registered | 2012 |
| onTRAC 1429126 · TMA825612 | SDI INNOVATIONS, INC. | 9 Electronics16 Paper24 Textiles+1 | Registered | 2012 |
| ONTRACE 1405549 · TMA762555 · design | Owner not shown | 9 Electronics42 Science | Registered | 2010 |
| ONTRAC 1241830 · TMA755602 | Novariant, Inc. (a California corporation) | 7 Machines9 Electronics12 Vehicles | Registered | 2009 |
| ONTRAK 0891096 · TMA554336 | Sodexo Canada, Ltd. | 41 Education | Registered | 2001 |
| ONTRAC 2361327 | Dyson Technology Limited | 9 Electronics | Pending | 2024 |
| ONTRAC 2361326 · design | Dyson Technology Limited | 9 Electronics | Pending | 2024 |
| OMNITRANS 2277723 · TMA1276577 | OMNITRANS INC. | 9 Electronics35 Advertising36 Finance+2 | Registered | 2024 |
| Ondaring 2237878 · TMA1258266 | Shenzhenshiheyimeishipinyouxiangongsi | 3 Cosmetics | Registered | 2024 |
| ONETRU 2229414 · TMA1218785 | Trans Union LLC | 35 Advertising36 Finance | Registered | 2024 |
| OMTERRA 2226536 · TMA1276012 | Siemens Energy Global GmbH & Co. KG | 7 Machines9 Electronics11 Lighting+3 | Registered | 2024 |
| onedor 2210732 · TMA1244167 | Onedor Inc. | 3 Cosmetics21 Housewares26 Sewing | Registered | 2024 |
| ONTRO 2174306 · TMA1226124 · design | LINGYI ALTERNATIVE ENERGY TECHNOLOGY (SHANGHAI) CO. LTD. | 12 Vehicles | Registered | 2024 |
| OMNITRANS 2167814 · TMA1277369 · design | OMNITRANS INC. | 16 Paper35 Advertising | Registered | 2024 |
| OmniTrack 2123458 · TMA1278646 | TrackGen Solutions Inc. | 9 Electronics | Registered | 2024 |
| ONTRUE 2094477 · TMA1150683 · design | Xiamen Sungiven Foods Holding Co. Ltd. | 32 Beer33 Wine | Registered | 2022 |
| OneTransit 2076794 · TMA1192528 | SanrusSoft Inc | 39 Transport | Registered | 2023 |
| ONETRIAL 2020870 · TMA1264999 | Owner not shown | 42 Science | Registered | 2024 |
| OMNITRON 1994437 · TMA1138316 | Healthfactories GmbH | 10 Medical | Registered | 2022 |
| Omedderic 1987588 · TMA1267764 | Shenzhen Just Sylvan Technology Co. Ltd | 10 Medical | Registered | 2024 |