| Hydro Vac Services LLC dba GroundBreakers LLC IN | Construction | 0 | — | F |
| Hydro, Inc. GA | Other Services | 0 | — | A |
| Hydro, Inc. IL | Other Services | 0 | — | A |
| Hydro, Inc. TX | Other Services | 0 | — | A |
| Hydro-Aire, Inc. DBA Crane Aerospace & Electronics CA | — | 0 | — | — |
| Hydro-Chem Systems Inc. MI | Manufacturing | 0 | — | F |
| Hydro-Gear Limited Partnership IL | Manufacturing | 0 | — | B |
| Hydro-Gear Limited Partnership IN | Manufacturing | 0 | — | D |
| Hydro-Gear Limited Partnership KY | Manufacturing | 0 | — | D |
| Hydro-Gear Limited Partnership TN | Manufacturing | 0 | — | B |
| Hydro-Pac, Inc. PA | Manufacturing | 0 | — | D |
| Hydro-Technologies, Inc. IN | Construction | 0 | — | F |
| HYDRO-THERMAL CORP. WI | Manufacturing | 0 | — | C |
| HydroairDees MD | Wholesale Trade | 0 | — | A |
| Hydroblasters Inc WI | Administrative & Waste Services | 0 | — | A |
| HydroBuilder Holdings CA | Retail Trade | 0 | — | A |
| Hydrocarbon Well Service Inc WV | Mining & Extraction | 0 | — | A |
| Hydrodec of North America, LLC. OH | Manufacturing | 0 | — | A |
| Hydroelc, Inc. FL | Manufacturing | 0 | — | A |
| Hydrofera LLC CT | Manufacturing | 0 | — | F |
| Hydrofire, LLC GA | Construction | 0 | — | A |
| HydroGeoLogic Inc. AL | Administrative & Waste Services | 0 | — | B |
| HydroGeoLogic Inc. CO | Administrative & Waste Services | 0 | — | A |
| HydroGeoLogic Inc. KS | Administrative & Waste Services | 0 | — | A |
| HydroGeoLogic Inc. MO | Administrative & Waste Services | 0 | — | A |
| HydroGeoLogic Inc. VA | Administrative & Waste Services | 0 | — | A |
| HydroHoist LLC OK | Manufacturing | 0 | — | C |
| Hydrolake MI | Construction | 0 | — | A |
| Hydrologic Distribution Company FL | Retail Trade | 0 | — | C |
| Hydromer, Inc. NC | Manufacturing | 0 | — | A |
| Hydrometrics, Inc. MT | Administrative & Waste Services | 0 | — | C |
| HYDRONIC SHELL TECHNOLOGIES LLC NY | Construction | 1 | $100,000 | — |
| HydroPoint Data Systems CA | Manufacturing | 0 | — | D |
| HydroPro Fire Sprinkler Company CO | Construction | 0 | — | A |
| HYDROPRO INC FL | Arts & Entertainment | 1 | $62,192 | — |
| Hydroserve, LLC dba Gustavo Preston Company MA | Wholesale Trade | 0 | — | C |
| Hydrostor USA Holdings Inc. CO | Utilities | 1 | $128,440 | — |
| Hydrox Laboratories IL | Manufacturing | 0 | — | F |
| HYDROZN LLC IN | Professional & Technical Services | 2 | $84,000 | — |
| Hydrus Energy Solutions (USA) Inc. ND | Mining & Extraction | 0 | — | A |
| HYDY, Inc. IL | Management of Companies | 1 | $160,000 | — |
| Hyena LLC IL | Transportation & Warehousing | 0 | — | D |
| Hyer Farms WA | Agriculture & Forestry | 0 | — | F |
| Hyer Industries, Inc. MA | Manufacturing | 0 | — | F |
| HyFlex Corporation IN | Manufacturing | 0 | — | A |
| Hygieia Biological Laboratories CA | Professional & Technical Services | 0 | — | F |
| Hygiena CA | Professional & Technical Services | 0 | — | F |
| Hygiene Services of Central Florida LLC FL | Administrative & Waste Services | 0 | — | D |
| Hygrade Metal Moulding Manufacturing Corp OR | Manufacturing | 0 | — | F |
| Hygrade Metal Moulding Manufacturing Corp PA | Manufacturing | 0 | — | F |
