| OMEX 1781964 · TMA979589 | Omex Agriculture Inc. | 1 Chemicals5 Pharmaceuticals16 Paper+1 | Registered | 2017 |
| OMAC 1589272 · TMA859863 · design | an individual | 7 Machines37 Construction | Registered | 2013 |
| OMSC 1565682 · TMA882016 | University of Ottawa Heart Institute | 41 Education | Registered | 2014 |
| OMIC 1534309 · TMA909726 | Mitchell Group USA LLC a Delaware corporation | 3 Cosmetics5 Pharmaceuticals | Registered | 2015 |
| OMAC 1161729 · TMA591657 | Ontario Mortgage Action Centre Ltd. | 36 Finance | Registered | 2003 |
| OMC 0886427 · TMA541297 · design | ONWARD MULTI-CORP. INC. | 16 Paper | Registered | 2001 |
| OMIC 0714335 · TMA415864 | OVERSEAS MERCHANDISE INSPECTION COMPANY LIMITED | 35 Advertising | Registered | 1993 |
| OMC 0291959 · TMA145172 | Bombardier Recreational Products Inc. | 2 Paints3 Cosmetics4 Oils+5 | Registered | 1966 |
| OMAC 2203988 | OMAC Holding Corp. | 25 Clothing41 Education | Pending | 2022 |
| OMAC 2117868 · design | OMAC Holding Corp. | 25 Clothing41 Education | Pending | 2021 |
| ONEC 2104641 | ONEC Construction Inc. | 37 Construction42 Science | Pending | 2021 |
| OMC 0974510 | Owner not shown | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 1997 |
| OMEX 0904270 | an individual | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 1990 |
| OMEGA 2230572 · TMA1245662 · design | an individual | 9 Electronics | Registered | 2024 |
| OMEGA 2151334 · TMA1186790 | Europart Supply LLC | 12 Vehicles | Registered | 2023 |
| OMEGA 2137078 · TMA1198009 · design | NATION DIVINE | 25 Clothing | Registered | 2023 |
| OMAIC 2079118 · TMA1180195 · design | an individual | 9 Electronics | Registered | 2023 |
| OMEGA 1943454 · TMA1084403 | an individual | 7 Machines | Registered | 2020 |
| OMEGA 1908869 · TMA1046915 · design | OMEGA SA (OMEGA AG) (OMEGA LTD.) | 41 Education | Registered | 2019 |
| OMEGA 1901916 · TMA1090679 · design | Omega Therapeutics, Inc. | 5 Pharmaceuticals42 Science | Registered | 2020 |
| OMNEX 1858835 · TMA1055276 | Cooper Technologies Company | 9 Electronics | Registered | 2019 |
| OAMIC 1833550 · TMA1021176 · design | XIAMEN OAMIC BIOTECHNOLOGY CO. LTD. | 1 Chemicals3 Cosmetics30 Coffee+1 | Registered | 2019 |
| OMEGA+ 1787638 · TMA993355 | PBM Nutritionals, LLC | 5 Pharmaceuticals | Registered | 2018 |
| OMEGA 1724626 · TMA924240 · design | OMEGA SA (OMEGA AG) (OMEGA LTD.) | 9 Electronics14 Jewellery | Registered | 2015 |
| OMEGA 1704078 · TMA988705 · design | OMEGA SA (OMEGA AG) (OMEGA LTD.) | 9 Electronics | Registered | 2018 |