| OPTIMALIST 2210401 · TMA1241783 | Opscotch Canada Inc. | 18 Leather21 Housewares24 Textiles+1 | Registered | 2024 |
| OPTIMATRIX 1570877 · TMA909854 | American Regent, Inc. | 5 Pharmaceuticals | Registered | 2015 |
| OPTIMAS 1721358 · TMA993313 | Optimas OE Solutions, LLC | 6 Metal17 Rubber20 Furniture+1 | Registered | 2018 |
| OPTIMASS 1168307 · TMA617470 | an individual | 9 Electronics | Registered | 2004 |
| OPTIMARK 0745375 · TMA574325 | Liebel-Flarsheim Company LLC | 5 Pharmaceuticals | Registered | 2003 |
| OPTIMETRIC 2277718 | LMPG Inc. | 11 Lighting | Pending | 2023 |
| OPTIMUS 2256065 · TMA1277637 · design | Owner not shown | 34 Tobacco | Registered | 2024 |
| OptimalRx 2200001 · TMA1238488 | an individual | 44 Medical | Registered | 2024 |
| OPTIMPLUS 2148192 · TMA1187822 | PSP Franchising, LLC | 31 Fresh | Registered | 2023 |
| OPTIMALPRINT 2119319 · TMA1226823 · design | an individual | 9 Electronics16 Paper35 Advertising+2 | Registered | 2024 |
| OPTIMI 2051920 · TMA1217931 | Optimi Health Corp. | 1 Chemicals5 Pharmaceuticals30 Coffee+1 | Registered | 2024 |
| OPTIMA 2034994 · TMA1144634 · design | Optima Contracting Limited | 6 Metal19 Building20 Furniture+1 | Registered | 2022 |
| OPTIMUS 1965219 · TMA1117298 | 6991165 CANADA INC. | 6 Metal9 Electronics | Registered | 2022 |
| OPTIMIST 1964304 · TMA1231872 | an individual | 25 Clothing | Registered | 2024 |
| OPTIMUS 1961213 · TMA1250375 | Diversey, Inc. | 9 Electronics21 Housewares | Registered | 2024 |
| OPTIMUS 1913353 · TMA1092937 | NAC International, Inc. | 6 Metal | Registered | 2021 |
| OPTIMAIRO 1901547 · TMA1132486 · design | CATA Deutschland GmbH | 6 Metal11 Lighting17 Rubber+2 | Registered | 2022 |
| OPTIMA 1894160 · TMA1072287 | Midea America Corp. | 7 Machines | Registered | 2020 |
| OPTIMALPRINT 1888247 · TMA1084643 · design | an individual | 16 Paper40 Treatment42 Science | Registered | 2020 |
| OPTIMAX 1865477 · TMA1028567 | CANADIAN BIO-SYSTEMS INC. | 5 Pharmaceuticals | Registered | 2019 |
| optimAIRo 1858915 · TMA1078708 | CATA Deutschland GmbH | 6 Metal11 Lighting17 Rubber+2 | Registered | 2020 |
| OPTIMISM 1811292 · TMA992215 | Definity Insurance Company | 36 Finance | Registered | 2018 |
| OPTIMAGE 1806328 · TMA1033685 | MEGASOFT Inc. | 9 Electronics42 Science | Registered | 2019 |
| OPTAMARK 1777332 · TMA1011792 | Owner not shown | 1 Chemicals2 Paints17 Rubber+1 | Registered | 2018 |
| Optimat 1756862 · TMA955027 | MATELAS RENE INC. | 20 Furniture | Registered | 2016 |