| EFFECTIV 2159522 · TMA1187897 · design | EFFECTIV HVAC INC. | 6 Metal11 Lighting | Registered | 2023 |
| EFFECTRA 1985317 · TMA1266284 | BASF CORPORATION, a legal entity | 1 Chemicals5 Pharmaceuticals | Registered | 2024 |
| EFFECTUAL 1893243 · TMA1097301 | Effectual, Inc. | 42 Science | Registered | 2021 |
| EFFECTO 1842340 · TMA1082805 · design | an individual | 7 Machines9 Electronics42 Science | Registered | 2020 |
| EFFECTOR 1814965 · TMA1081837 | eFFECTOR Therapeutics, Inc. | 42 Science44 Medical | Registered | 2020 |
| effect 1288939 · TMA698238 | MBG International Premium Brands GmbH | 29 Meat30 Coffee32 Beer+1 | Registered | 2007 |
| EFFECTO 0484487 · TMDA41644 | SWIMC LLC | 1 Chemicals2 Paints7 Machines+5 | Registered | 1927 |
| EFFECTOR 2264399 · design | eFFECTOR Therapeutics, Inc. | 42 Science | Pending | 2023 |
| Effectual 2218397 | Effectual Capital GmbH | 36 Finance | Pending | 2022 |
| EFFECTUAL 2173540 · design | Effectual, Inc. | 42 Science | Pending | 2022 |
| EFECT 1630622 · TMA1022445 | Zymeworks BC Inc. | 5 Pharmaceuticals42 Science45 Legal | Registered | 2019 |
| Effektor 1606024 · TMA935193 | X-Technology Swiss GmbH | 18 Leather25 Clothing | Registered | 2016 |
| EFFECOAT 1551572 · TMA877937 | Owner not shown | 5 Pharmaceuticals | Registered | 2014 |
| EFECTOR 1001341 · TMA533189 | I F M ELECTRONIC GMBH | 9 Electronics | Registered | 2000 |
| EFECTOR 0437995 · TMA252781 | I F M ELECTRONIC GMBH | 9 Electronics | Registered | 1980 |
| EffectScape 2124030 · TMA1186604 | TikTok Ltd. | 9 Electronics35 Advertising41 Education+1 | Registered | 2023 |
| EFFECTIVEWARE 1459235 · TMA865760 | Deloitte Inc. | 35 Advertising41 Education | Registered | 2013 |
| EVGATSAUTO 2236653 · TMA1256939 | Shenzhen Yibai Network Technology Co. Ltd. | 8 Hand9 Electronics12 Vehicles | Registered | 2024 |
| epicite 2179291 · TMA1280687 | JeNaCell GmbH | 5 Pharmaceuticals | Registered | 2025 |
| EVOCATH 2163515 · TMA1219311 | TELEFLEX LIFE SCIENCES PTE. LTD. | 10 Medical | Registered | 2024 |
| EBIZCITY 2135272 · TMA1198902 | Ebizware, Inc. | 9 Electronics | Registered | 2023 |
| EPACT 2089741 · TMA1184957 · design | Kumho Tire Co., Inc. | 12 Vehicles | Registered | 2023 |
| EPISODE 2071357 · TMA1202581 | Zumiez Services Inc. | 25 Clothing28 Toys | Registered | 2023 |
| EVISTR 2067337 · TMA1158255 · design | Shenzhen Wista Technology Co. Ltd. | 9 Electronics | Registered | 2022 |
| Evozid 2054774 · TMA1193281 | medionta inc | 5 Pharmaceuticals | Registered | 2023 |