| HYDROMIX 1795407 · TMA988578 | Hayward Gordon ULC | 37 Construction40 Treatment42 Science | Registered | 2018 |
| HYDROMIX 1750449 · TMA1007578 · design | an individual | 7 Machines37 Construction | Registered | 2018 |
| HYDROMIX 1126602 · TMA586267 | Hydrofarm, LLC | 1 Chemicals | Registered | 2003 |
| HYDRONIX 0681060 · TMA406813 | HYDRONIX LIMITED | 9 Electronics | Registered | 1993 |
| HYDRO-MIX 0790046 · TMA478869 | HYDRONIX LTD. | 9 Electronics | Registered | 1997 |
| HYDROLIQ 2136716 · TMA1236974 | an individual | 1 Chemicals5 Pharmaceuticals37 Construction+1 | Registered | 2024 |
| HYDROLUX 2059809 · TMA1239404 · design | 9399-7070 Québec inc. | 1 Chemicals | Registered | 2024 |
| Hydromax 1915980 · TMA1094296 | Ultramax Products Ltd | 10 Medical | Registered | 2021 |
| HYDROMAX 1806457 · TMA1015032 | Glanbia Nutritionals Limited | 1 Chemicals | Registered | 2019 |
| HYDROMX 1682337 · TMA910430 · design | Hydromx Inc. | 1 Chemicals | Registered | 2015 |
| HYDROKIT 1575635 · TMA902594 | Danco, Inc. | 11 Lighting | Registered | 2015 |
| HYDROMAX 1556042 · TMA849957 | Cooley, Inc. | 24 Textiles | Registered | 2013 |
| HYDROMAX 1521096 · TMA868656 | Amtrol Licensing, Inc. a Rhode Island Corporation | 11 Lighting | Registered | 2014 |
| HYDRORIL 1428801 · TMA808596 | an individual | 1 Chemicals3 Cosmetics5 Pharmaceuticals | Registered | 2011 |
| HYDROLUX 1346459 · TMA770779 | ChemSpec USA, LLC | 1 Chemicals2 Paints | Registered | 2010 |
| HYDROMAX 1345336 · TMA768620 | Tyler Pipe Company, a division of McWANE, INC. | 6 Metal19 Building20 Furniture | Registered | 2010 |
| HYDRIX 1307520 · TMA734558 | Owner not shown | 3 Cosmetics | Registered | 2009 |
| HYDROMAX 1270267 · TMA723540 · design | ENMAX CORPORATION | 35 Advertising39 Transport | Registered | 2008 |
| HYDROX 0890202 · TMA549021 | Diversey, Inc. (a Delaware corporation) | 5 Pharmaceuticals | Registered | 2001 |
| HYDRONIC 0823117 · TMA486110 | Eberspächer Climate Control Systems GmbH | 11 Lighting | Registered | 1997 |
| HYDROMAX 0729850 · TMA434028 | Maax Bath Inc. | 11 Lighting | Registered | 1994 |
| HYDROLUX 0434935 · TMA240589 | Kohler Canada Co./Compagnie Kohler Canada | 11 Lighting | Registered | 1980 |
| HYDRO AX 0350563 · TMA197470 | Weiler Forest Products, Inc. | 7 Machines | Registered | 1974 |
| HYDROIL 0327863 · TMA176091 | Dodge Industrial, Inc. | 7 Machines11 Lighting | Registered | 1971 |
| HYDROKIT 0249182 · TMA115074 | Velcon Filters, LLC | 5 Pharmaceuticals9 Electronics | Registered | 1959 |