| OMNISTORE 2038596 · TMA1250688 | TGW Logistics Group GmbH | 7 Machines9 Electronics35 Advertising+1 | Registered | 2024 |
| OmniStop 1894062 · TMA1084044 | Saferoads Pty Ltd | 6 Metal19 Building | Registered | 2020 |
| OMNISTAR 1682847 · TMA930082 · design | NINGBO ASIA PULP & PAPER CO. LTD. | 16 Paper | Registered | 2016 |
| OMNISTAR 0889223 · TMA582937 · design | Trimble Inc. | 9 Electronics35 Advertising38 Telecommunications | Registered | 2003 |
| OMNISTAR 0882624 · TMA565059 | GENERAL INSTRUMENT CORPORATION | 9 Electronics | Registered | 2002 |
| OMNISTAR 0749485 · TMA505441 | Trimble Inc. | 9 Electronics38 Telecommunications | Registered | 1998 |
| OMNISTAT 1416829 · TMA826085 | MEDTRADE PRODUCTS LIMITED | 5 Pharmaceuticals10 Medical | Registered | 2012 |
| ONSTAR 2095726 · TMA1250745 | Onstar LLC | 36 Finance | Registered | 2024 |
| ONESTAR 2094875 · TMA1172531 · design | Ming Shin Tools Co. Ltd. | 8 Hand | Registered | 2023 |
| ONESTOP 1818046 · TMA1067823 | MSC Services Corp. | 35 Advertising | Registered | 2020 |
| ONESTER 1663653 · TMA901337 | Munchkin, Inc. | 25 Clothing | Registered | 2015 |
| OEMStar 1466366 · TMA827514 | NOVATEL INC. | 9 Electronics | Registered | 2012 |
| ONESTOP 1416208 · TMA822870 · design | JIM PATTISON INDUSTRIES LTD. | 9 Electronics35 Advertising | Registered | 2012 |
| ONESTOP 1007591 · TMA539290 | Tomra/CBSI Acquisition, LLC | 7 Machines | Registered | 2001 |
| ONSTAR 0862532 · TMA509416 · design | Onstar, LLC a Delaware corporation | 9 Electronics35 Advertising38 Telecommunications+3 | Registered | 1999 |
| ONSTAR 0861047 · TMA509381 · design | Onstar, LLC a Delaware corporation | 9 Electronics35 Advertising38 Telecommunications+3 | Registered | 1999 |
| ONSTAR 0804290 · TMA492833 | Onstar, LLC a Delaware corporation | 38 Telecommunications | Registered | 1998 |
| OmicGot 2269685 | HUIZHOU YUMIN NETWORK TECHNOLOGY CO. LTD. | 25 Clothing | Pending | 2023 |
| OMNISTACK 1606598 · TMA885863 | Hewlett Packard Enterprise Development LP | 9 Electronics | Registered | 2014 |
| OMNISTACK 1529775 · TMA842074 | Owner not shown | 9 Electronics | Registered | 2013 |
| OMNISCOUT 1460613 · TMA803332 | Worldscout Corporation | 9 Electronics38 Telecommunications39 Transport+2 | Registered | 2011 |
| OMNISTRIP 1110299 · TMA599803 | an individual | 5 Pharmaceuticals | Registered | 2004 |
| OMNISTATION 2043320 | Galcom International Inc. | 9 Electronics38 Telecommunications41 Education | Pending | 2020 |
| ONCOTERRA 2217074 · TMA1235265 | Phase Genomics, Inc. | 42 Science | Registered | 2024 |
| OMGTMD 2177941 · TMA1227273 | an individual | 6 Metal | Registered | 2024 |