| HMHomeland Metal Products | Bossier City | LA | — | ◇ UNVERIFIED |
| HCHonor Companies LLC | Sapulpa | OK | — | ◇ UNVERIFIED |
| HBHoof Beat Gates & Corrals | Fallon | NV | — | ◇ UNVERIFIED |
| HHHorns & Hoofs Inc | Vernon Hills | IL | — | ◇ UNVERIFIED |
| HSHorseshoe Steel Erectors | Austin | TX | — | ◇ UNVERIFIED |
| HCHosford & Company | Ann Arbor | MI | — | ◇ UNVERIFIED |
| HLHoss Lee Stairways, INC. | Roseville | CA | — | ◇ UNVERIFIED |
| HPHotcoats Powder Coating | Chico | CA | — | ◇ UNVERIFIED |
| HRHotel & Restaurant Supply INC. | Savannah | TN | — | ◇ UNVERIFIED |
| HOHouse of Forgings, LLC | Houston | TX | — | ◇ UNVERIFIED |
| HFHouston Fab Truck Rigging INC. | Houston | TX | — | ◇ UNVERIFIED |
| HSHoward Structural Steel, Inc. | Saginaw | MI | — | ◇ UNVERIFIED |
 Howmedica Osteonics CORP | Murray | UT | — | ◇ UNVERIFIED |
| HSHowser Steel INC | Portland | OR | — | ◇ UNVERIFIED |
| HRH & R Industrial | Kokomo | IN | — | ◇ UNVERIFIED |
| HIHrke, INC. | Fort Worth | TX | — | ◇ UNVERIFIED |
| HRH R Leuenberger Incorporated | Allison Park | PA | — | ◇ UNVERIFIED |
| HIHsc Investments, INC. | Colfax | NC | — | ◇ UNVERIFIED |
| HSH & S Constructors, INC. | Corpus Christi | TX | — | ◇ UNVERIFIED |
| HCHti Cybernetics | Sterling Heights | MI | — | ◇ UNVERIFIED |
| HHubzco | Saint Louis | MO | — | ◇ UNVERIFIED |
| HMHughes Metal Works, LLC | Greensboro | NC | — | ◇ UNVERIFIED |
| HIHumphrey Industrial Solutions LLC | Bolivar | MO | — | ◇ UNVERIFIED |
| HDHunter Douglas Architectural Products INC. | Norcross | GA | — | ◇ UNVERIFIED |
| HMHunter Metal | Tahoe Vista | CA | — | ◇ UNVERIFIED |
| HMHutchinson Manufacturing INC | Hutchinson | MN | — | ◇ UNVERIFIED |
| HTHyperloop Technologies, INC | Moapa | NV | — | ◇ UNVERIFIED |
| HCHytec Cutting Service INC | Louisville | KY | — | ◇ UNVERIFIED |
| HTHy-tech Truck & Trailer Mfg LLC | Fort Morgan | CO | — | ◇ UNVERIFIED |
| IEIan Eddy Blacksmith | Saxtons River | VT | — | ◇ UNVERIFIED |
| IAI & A Properties, LLC | Midland | NC | — | ◇ UNVERIFIED |
| IGIbarra Group LLC | Chicago | 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 |
| IIIda Installations, INC. | Southington | CT | — | ◇ UNVERIFIED |
| IPIdeal Portable Buildings & Carports* | West Monroe | LA | — | ◇ UNVERIFIED |
| IPIdeal Products of America | Malvern | PA | — | ◇ UNVERIFIED |
| IMIgnacio Martinez Dba Sunset and Company | Apple Valley | CA | — | ◇ UNVERIFIED |
| IOIhp Operations, LLC | Santa Ana | CA | — | ◇ UNVERIFIED |
| ITIllinois Tool Works INC | Bakersfield | CA | — | ◇ UNVERIFIED |
| IHImpakt Holdings LLC Dba Dmp | Burlingame | CA | — | ◇ UNVERIFIED |
| IFImperial Fabricating INC. (closed) | Madison | TN | — | ◇ UNVERIFIED |
| IRImperial Rotary Dies | Santa Fe Spgs | CA | — | ◇ UNVERIFIED |
| ISImperial Steel Craft INC | Hillsboro | OR | — | ◇ UNVERIFIED |
| IIIncom, INC. | Kailua Kona | HI | — | ◇ UNVERIFIED |
| ISIndependent Steel LLC | Manassas | VA | — | ◇ UNVERIFIED |
| ISIndiana Steel and Engineering Corporation | Bedford | IN | — | ◇ UNVERIFIED |
| ICIndustrial Contractors | Evansville | IN | — | ◇ UNVERIFIED |
| IDIndustrial Design Fabrication & Installation, INC. | Sioux City | IA | — | ◇ UNVERIFIED |
