| HCHerrick CORP Dba San Bernardino Steel INC | San Bernardino | CA | — | ◇ UNVERIFIED |
| HHH Hirschberger CO INC | Portland | OR | — | ◇ UNVERIFIED |
| HIHigh Industries INC | Lancaster | PA | — | ◇ UNVERIFIED |
| HSHighway Systems, INC. | Ocala | FL | — | ◇ UNVERIFIED |
| HRHill Rebar INC | Corona | CA | — | ◇ UNVERIFIED |
| HCHillside Custom Machining & Fabrication, LLC | Denver | PA | — | ◇ UNVERIFIED |
| HWHinojosas Welding Service LLC | Alice | TX | — | ◇ UNVERIFIED |
| HEHirschfeld Energy Systems, LLC | San Angelo | TX | — | ◇ UNVERIFIED |
| HIHirschfeld Industries | San Angelo | TX | — | ◇ UNVERIFIED |
| HIHirschfeld Industries Group LP | Abilene | TX | — | ◇ UNVERIFIED |
| HIHirschfeld Industries LP | San Angelo | TX | — | ◇ UNVERIFIED |
 Hi-Tech Metals, Inc. | Maspeth | NY | — | ◇ UNVERIFIED |
| HIHme INC | Topeka | KS | — | ◇ UNVERIFIED |
| HIHme, INC. | Laramie | WY | — | ◇ UNVERIFIED |
| HIHmt, INC. | Blackwell | OK | — | ◇ UNVERIFIED |
| HWHofmeister Welding & Fabricating, INC. | Griggsville | IL | — | ◇ UNVERIFIED |
| HAHof's and Yates Rebar INC Dba H and Y Rebar INC | Long Beach | CA | — | ◇ UNVERIFIED |
| HFHogan Fab INC | Portland | OR | — | ◇ UNVERIFIED |
| HPHogan Products & Services LLC | Pulaski | PA | — | ◇ UNVERIFIED |
| HMHolland Manufacturing Co., INC. | Dothan | AL | — | ◇ UNVERIFIED |
| HSHolley Steel, Inc. | Elmore | AL | — | ◇ UNVERIFIED |
| HRHolt Repair & Manufacturing INC | Holt | CA | — | ◇ UNVERIFIED |
| HMHomeland Metal Products | Bossier City | LA | — | ◇ UNVERIFIED |
| HCHonor Companies LLC | Sapulpa | OK | — | ◇ UNVERIFIED |
| HSHorseshoe Steel Erectors | Austin | TX | — | ◇ UNVERIFIED |
| HRHotel & Restaurant Supply INC. | Savannah | TN | — | ◇ UNVERIFIED |
| HFHouston Fab Truck Rigging INC. | Houston | TX | — | ◇ UNVERIFIED |
| HSHoward Structural Steel, Inc. | Saginaw | MI | — | ◇ UNVERIFIED |
| HSHowser Steel INC | Portland | OR | — | ◇ UNVERIFIED |
| HRH & R Industrial | Kokomo | IN | — | ◇ UNVERIFIED |
| HIHrke, INC. | Fort Worth | TX | — | ◇ UNVERIFIED |
| HIHsc Investments, INC. | Colfax | NC | — | ◇ UNVERIFIED |
| HSHsk Stainless, LLC | Gallatin | TN | — | ◇ UNVERIFIED |
| HCHti Cybernetics | Sterling Heights | MI | — | ◇ UNVERIFIED |
| HIHumphrey Industrial Solutions LLC | Bolivar | MO | — | ◇ UNVERIFIED |
| HTHyperloop Technologies, INC | Moapa | NV | — | ◇ UNVERIFIED |
| HTHy-tech Truck & Trailer Mfg LLC | Fort Morgan | CO | — | ◇ UNVERIFIED |
| IAI & A Properties, LLC | Midland | NC | — | ◇ UNVERIFIED |
| IGIbarra Group LLC | Chicago | IL | — | ◇ UNVERIFIED |
| IKIce Krackers, INC. | Springfield | IL | — | ◇ UNVERIFIED |
| IFICON Fabrications LLC | Goose Creek | SC | — | ◇ UNVERIFIED |
| IMIcon Metal Works INC Dba Icon Structures | Fontana | CA | — | ◇ UNVERIFIED |
| ISIcon Steel, LLC | Georgetown | TX | — | ◇ UNVERIFIED |
| ISIdaho Steel Products, INC. | Caldwell | ID | — | ◇ UNVERIFIED |
| IPIdeal Portable Buildings & Carports* | West Monroe | LA | — | ◇ UNVERIFIED |
| IPIdeal Products of America | Malvern | PA | — | ◇ UNVERIFIED |
| ISIdeal Stainless, INC | Springfield | MO | — | ◇ UNVERIFIED |
| IOIhp Operations, LLC | Santa Ana | CA | — | ◇ UNVERIFIED |
| ITIllinois Tool Works INC | Bakersfield | CA | — | ◇ UNVERIFIED |
| IWIllinois Weld & Machine, INC. | Hanna City | IL | — | ◇ UNVERIFIED |
