| EFFICIENT 0469801 · TMA301087 | Unilever Canada Inc. | 3 Cosmetics | Registered | 1985 |
| KOH-EFFICIENT 1727586 · TMA925916 | CooperSurgical, Inc. | 10 Medical | Registered | 2016 |
| EFFICIENT 360° 1626688 · TMA956063 | SIRIUS SERVICES CONSEILS EN TECHONOLOGIE DE L'INFORMATION INC. | 9 Electronics36 Finance | Registered | 2016 |
| DIESEL EFFICIENT 1857566 · TMA1017537 | Exxon Mobil Corporation | 1 Chemicals4 Oils | Registered | 2019 |
| DIESEL EFFICIENT 1775055 · TMA1031448 · design | Exxon Mobil Corporation | 4 Oils | Registered | 2019 |
| Useful&Efficient 2224756 | an individual | 35 Advertising | Pending | 2022 |
| EFFICIENT MUSICIAN 2162174 · TMA1211255 | Efficient Musician Inc. | 9 Electronics35 Advertising41 Education | Registered | 2023 |
| DIESEL EFFICIENT D 1847484 · TMA1031635 · design | Exxon Mobil Corporation | 4 Oils | Registered | 2019 |
| E EFFICIENT ENERGY 1646888 · TMA1025921 · design | an individual | 7 Machines9 Electronics11 Lighting+2 | Registered | 2019 |
| BIODIESEL EFFICIENT 2216531 · TMA1248297 | Exxon Mobil Corporation | 4 Oils | Registered | 2024 |
| EFFICIENT BY NATURE 1409449 · TMA859484 | John I. Haas, Inc. (a Delaware corporation) | 1 Chemicals3 Cosmetics5 Pharmaceuticals+3 | Registered | 2013 |
| EFFICIENT PORTFOLIOS 1818487 · TMA1065497 | an individual | 35 Advertising36 Finance | Registered | 2019 |
| BEST ENERGY EFFICIENT 2017873 · design | BEST CB LLC | 35 Advertising42 Science | Pending | 2020 |
| THE EFFICIENT RESPONSE 1418633 · TMA773864 | SOLUTIONS EMERGENSYS INC. | 9 Electronics37 Construction38 Telecommunications+2 | Registered | 2010 |
| COTMAC EFFICIENT ALWAYS 1886854 · TMA1085862 · design | an individual | 9 Electronics42 Science | Registered | 2020 |
| LUMEN EFFICIENT DESIGN INC. 1815919 · TMA1000023 · design | Lumen Efficient Design Inc. | 9 Electronics11 Lighting | Registered | 2018 |
| TOOLS FOR EFFICIENT LIVING 1393208 · TMA874677 | Simplehuman LLC | 16 Paper20 Furniture21 Housewares | Registered | 2014 |
| EXXONMOBIL DIESEL EFFICIENT 1951259 · TMA1098218 | Exxon Mobil Corporation | 1 Chemicals | Registered | 2021 |
| TREO EASY, ELECTRONIC, EFFICIENT 1703951 · TMA926434 · design | Transportation Investment Corporation | 9 Electronics16 Paper35 Advertising+4 | Registered | 2016 |
| TREO EASY, ELECTRONIC, EFFICIENT 1703937 · TMA926436 | Transportation Investment Corporation | 9 Electronics16 Paper35 Advertising+4 | Registered | 2016 |
| EFFICIENT TECHNOLOGY MANAGEMENT 1944430 · TMA1175413 | an individual | 36 Finance | Registered | 2023 |
| ALWAYS HEALTHY ALWAYS EFFICIENT 1856432 · TMA1057294 | Ventacity Systems, Inc. | 11 Lighting37 Construction42 Science | Registered | 2019 |
| PMO PEOPLE FOR EFFICIENT PROJECTS 2163801 · design | an individual | 35 Advertising41 Education42 Science | Pending | 2021 |
| BAYCOX IRON EASY EFFICIENT ECONOMIC 1874770 · TMA1071568 · design | Bayer Intellectual Property GmbH | 5 Pharmaceuticals | Registered | 2020 |
| ECOSCAPE EFFICIENT BUILDING SOLUTIONS 1512854 · TMA837517 · design | Innovative Composites International Inc. | 19 Building | Registered | 2012 |