| Hydraulic Technologies OH | — | 0 | — | — |
| Hydraulic Tubes & Fittings, LLC MI | Manufacturing | 0 | — | F |
| HYDRAULICS INTERATIONAL, INC. UT | Manufacturing | 0 | — | A |
| Hydraulics,Inc. TX | Manufacturing | 0 | — | F |
| Hydril Company TX | Manufacturing | 2 | $72,861 | — |
| Hydril Company (Tenaris) TX | Manufacturing | 0 | — | C |
| Hydrite Chemical Co. CA | Wholesale Trade | 0 | — | B |
| Hydrite Chemical Co. IA | Wholesale Trade | 0 | — | A |
| Hydrite Chemical Co. IL | Wholesale Trade | 0 | — | A |
| Hydrite Chemical Co. IN | Wholesale Trade | 0 | — | A |
| Hydrite Chemical Co. TX | Wholesale Trade | 0 | — | A |
| Hydrite Chemical Co. WI | Wholesale Trade | 0 | — | A |
| Hydro SC | — | 0 | — | — |
| Hydro Air Components, Inc. NY | Manufacturing | 1 | $77,746 | — |
| Hydro Aluminum Metals USA, LLC TX | Manufacturing | 0 | — | A |
| Hydro Aluminum Metals USA, LLC. Henderson KY | Manufacturing | 0 | — | F |
| Hydro Aluminum Metals, USA, LLC TX | Manufacturing | 0 | — | A |
| Hydro Aluminum North America, Inc. - Extrusion Operations MO | — | 0 | — | — |
| Hydro East PA | Other Services | 0 | — | A |
| Hydro Electronic Devices, Inc. WI | Manufacturing | 0 | — | A |
| Hydro Extrusion Portland, Inc. OR | Manufacturing | 0 | — | D |
| Hydro Extrusion USA, LLC AR | Manufacturing | 0 | — | A |
| Hydro Extrusion USA, LLC AZ | Manufacturing | 0 | — | A |
| Hydro Extrusion USA, LLC CA | Manufacturing | 0 | — | C |
| Hydro Extrusion USA, LLC FL | Manufacturing | 0 | — | A |
| Hydro Extrusion USA, LLC GA | Manufacturing | 0 | — | A |
| Hydro Extrusion USA, LLC IL | Management of Companies | 4 | $100,973 | A |
| Hydro Extrusion USA, LLC IN | Manufacturing | 0 | — | A |
| Hydro Extrusion USA, LLC LA | Manufacturing | 0 | — | D |
| Hydro Extrusion USA, LLC MO | Manufacturing | 0 | — | C |
| Hydro Extrusion USA, LLC OH | Manufacturing | 0 | — | A |
| Hydro Extrusion USA, LLC OR | Manufacturing | 0 | — | F |
| Hydro Extrusion USA, LLC PA | Manufacturing | 0 | — | D |
| Hydro Extrusion USA, LLC SD | Manufacturing | 0 | — | D |
| Hydro Extrusion USA, LLC UT | Manufacturing | 0 | — | A |
| Hydro Extrusion USA, LLC - Phoenix Fabrication AR | Manufacturing | 0 | — | B |
| Hydro Honing Laboratories CT | Manufacturing | 0 | — | A |
| Hydro Mechanical of Ohio OK | Construction | 0 | — | F |
| Hydro Operating llc dba Hydro Engineering MN | Manufacturing | 0 | — | F |
| Hydro Optimization and Automation Solutions Inc NE | Professional & Technical Services | 0 | — | A |
| Hydro Precision Tibiing FL | Manufacturing | 0 | — | A |
| Hydro Precision Tubing USA, LLC FL | Manufacturing | 1 | $90,110 | — |
| Hydro Rents Northwest Inc. WA | Construction | 0 | — | A |
| Hydro Resources - Mid-Continent, Inc KS | Construction | 0 | — | F |
| Hydro Resources - Mid-Continent, Inc NM | Construction | 0 | — | F |
| Hydro Resources - Mid-Continent, Inc TX | Construction | 0 | — | F |
| Hydro Resources - Rocky Mountain CO | Construction | 0 | — | F |
| Hydro Systems USA WA | Wholesale Trade | 0 | — | A |
| Hydro Tube Enterprises, Inc. NC | Manufacturing | 0 | — | F |
| Hydro Tube Enterprises, Inc. OH | Manufacturing | 0 | — | F |
