| HyDrop 1690094 · TMA953532 | ELBIT SYSTEMS LTD. a legal entity | 1 Chemicals | Registered | 2016 |
| HYDROB 1110345 · TMA621358 | CHEMISCHE FABRIK KREUSSLER & CO. GMBH LIMITED (A German limited liabilty company) | 1 Chemicals3 Cosmetics | Registered | 2004 |
| HYDROPAD 2105098 · TMA1275638 | Güntner GmbH & Co. KG | 7 Machines9 Electronics11 Lighting | Registered | 2024 |
| HYDROPEL 1917541 · TMA1101869 | an individual | 19 Building | Registered | 2021 |
| HYDROPON 1831553 · TMA1026217 | Axalta Coating Systems GmbH | 2 Paints | Registered | 2019 |
| HYDROPAK 1560499 · TMA873288 | DYNAPOMPE INC. | 7 Machines | Registered | 2014 |
| HydroPro 1381222 · TMA743332 | HCC INSURANCE HOLDINGS, INC. | 36 Finance | Registered | 2009 |
| HYDROPAC 1238612 · TMA785797 | Hydropac, LLC | 7 Machines10 Medical | Registered | 2010 |
| HYDROPRO 1149503 · TMA596645 | EAST COAST ROPE LIMITED | 22 Ropes | Registered | 2003 |
| HYDROPEL 1088412 · TMA588364 | AOC, LLC (Delaware limited liability company) | 1 Chemicals | Registered | 2003 |
| HYDROPEL 0827102 · TMA496550 | LTP SPORTS GROUP INC. | 24 Textiles | Registered | 1998 |
| HYDROPAC 0752006 · TMA441645 | Hydro-Québec | 9 Electronics16 Paper35 Advertising | Registered | 1995 |
| HYDROPOD 2262664 | Owner not listed | 11 Lighting | Pending | 2023 |
| HydroPRS 2152634 | Mura Technology Limited | 1 Chemicals2 Paints4 Oils+5 | Pending | 2021 |
| HydroPad 2002736 | Gravitas (International) Ltd | 10 Medical18 Leather21 Housewares+1 | Pending | 2019 |
| HydroVu 2132366 · TMA1175231 | In-Situ, Inc. | 9 Electronics | Registered | 2023 |
| Hydrobe 1950910 · TMA1267674 | Hydrobe Cooperation Inc. | 9 Electronics41 Education | Registered | 2024 |
| Hydrobe 2303643 | HYDROBE PTY LTD | 1 Chemicals40 Treatment42 Science | Pending | 2023 |
| HYDROPORT 2180840 · TMA1211373 | Access Vascular, Inc. | 10 Medical | Registered | 2023 |
| HYDROPATH 1786320 · TMA974168 | Hydropath Technology Ltd. | 9 Electronics11 Lighting | Registered | 2017 |
| HydroPlas 1773561 · TMA965499 | THORDON BEARINGS INC. | 7 Machines | Registered | 2017 |
| HydroPure 1733640 · TMA942193 | Nutrabolics Inc. | 5 Pharmaceuticals | Registered | 2016 |
| HYDROPLUS 1609698 · TMA880308 | BALLARD POWER SYSTEMS INC. | 4 Oils | Registered | 2014 |
| HYDROPULL 1580923 · TMA858163 | Tempress Technologies, Inc. | 7 Machines | Registered | 2013 |
| HYDROPLUS 1564556 · TMA873660 · design | Les Entreprises Cortey Inc. | 6 Metal8 Hand9 Electronics+5 | Registered | 2014 |