| HSH & S Constructors, INC. | Corpus Christi | TX | — | ◇ UNVERIFIED |
| HIHtb INC | Hayward | CA | — | ◇ UNVERIFIED |
| HCHti Cybernetics | Sterling Heights | MI | — | ◇ UNVERIFIED |
| HIHubbell Inc/lyall Division | Corona | CA | — | ◇ UNVERIFIED |
| HIHuckleberry Industries | El Segundo | CA | — | ◇ UNVERIFIED |
| HIHumphrey Industrial Solutions LLC | Bolivar | MO | — | ◇ UNVERIFIED |
| HIHurford Industries INC | Beaverton | OR | — | ◇ UNVERIFIED |
| HMHutchinson Manufacturing INC | Hutchinson | MN | — | ◇ UNVERIFIED |
| HFHydraulic Fittings, INC. | Racine | WI | — | ◇ UNVERIFIED |
| HIHynes Industries, INC. | Youngstown | OH | — | ◇ UNVERIFIED |
| HTHyperloop Technologies, INC | Moapa | NV | — | ◇ UNVERIFIED |
| HCHytec Cutting Service INC | Louisville | KY | — | ◇ UNVERIFIED |
| HTHy-tech Truck & Trailer Mfg LLC | Fort Morgan | CO | — | ◇ 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 |
| IPIdeal Portable Buildings & Carports* | West Monroe | LA | — | ◇ UNVERIFIED |
| IPIdeal Products of America | Malvern | PA | — | ◇ UNVERIFIED |
| IIIFAB Industrial, LLC | Shreveport | LA | — | ◇ UNVERIFIED |
| IOIhp Operations, LLC | Santa Ana | CA | — | ◇ UNVERIFIED |
| IIIlco Industries | Rancho Dominguez | CA | — | ◇ UNVERIFIED |
| ITIllinois Tool Works INC | Bakersfield | CA | — | ◇ UNVERIFIED |
| IBImc Bushings Manufacturing | Valencia | CA | — | ◇ UNVERIFIED |
| IZImi Zimmermann and Jansen | Houston | TX | — | ◇ UNVERIFIED |
| IHImpakt Holdings LLC Dba Dmp | Burlingame | CA | — | ◇ UNVERIFIED |
| IFImperial Fabricating INC. (closed) | Madison | TN | — | ◇ UNVERIFIED |
| IMImperial Manufacturing Group USA INC. | Alton | IL | — | ◇ 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 |
| IFIndustrial Fabricating INC. | East Syracuse | NY | — | ◇ UNVERIFIED |
| IFIndustrial Fabricating Systems INC | Milford | MI | — | ◇ UNVERIFIED |
| IFIndustrial Fabrication Services INC | Lake Crystal | MN | — | ◇ UNVERIFIED |
| IFIndustrial Fabrication Services INC | Lake Crystal | MN | — | ◇ UNVERIFIED |
| IFIndustrial Fabrication Services, LLC | Sand Springs | OK | — | ◇ UNVERIFIED |
| IFIndustrial Fabricators | Gastonia | NC | — | ◇ UNVERIFIED |
| IFIndustrial Fabricators INC. | Gastonia | NC | — | ◇ UNVERIFIED |
| IFIndustrial Fabricators, INC - Vc Plant | Gastonia | NC | — | ◇ UNVERIFIED |
| IFIndustrial Fabricators of Virgina INC | Verona | VA | — | ◇ UNVERIFIED |
| IFIndustrial Fabricators of Virginia INC | Fishersville | VA | — | ◇ UNVERIFIED |
| IFIndustrial Finishing Services INC | Erlanger | KY | — | ◇ UNVERIFIED |
| IIIndustrial Injection Services INC. | Richfield | UT | — | ◇ UNVERIFIED |
| IMIndustrial Machine & Mfg CO | South El Monte | CA | — | ◇ UNVERIFIED |
| IMIndustrial Manufacturing and Installations, Inc | Sedalia | CO | — | ◇ UNVERIFIED |
| IPIndustrial Pipe Fittings LLC Dba Plasson USA | Corsicana | TX | — | ◇ UNVERIFIED |
| IPIndustrial Piping Corporation | Staunton | VA | — | ◇ UNVERIFIED |
| IPIndustrial Piping Corporation | Staunton | VA | — | ◇ UNVERIFIED |
| IPIndustrial Plating & Machine, INC. | Bluefield | WV | — | ◇ UNVERIFIED |
| IPIndustrial Precision Coatings INC | Randolph | MA | — | ◇ UNVERIFIED |
| ISIndustrial Sheetmetal & Fabricators, INC. | Vidor | TX | — | ◇ UNVERIFIED |
| ISIndustrial Steel Construction Incorporated | Gary | IN | — | ◇ UNVERIFIED |
| ISIndustrial Steel Fabrication, Incorporated | Hazelwood | MO | — | ◇ UNVERIFIED |
| ISIndustrial Steel Fabricators, INC. | Jacksonville | FL | — | ◇ UNVERIFIED |
 Industrial Tool & Die Co., INC. | Harlingen | TX | — | ◇ UNVERIFIED |
| ITIndustrial Toolz INC | Kenosha | WI | — | ◇ UNVERIFIED |
| ITIndustrial Tube Components, Inc | Lizton | IN | — | ◇ UNVERIFIED |
| ICInfra-metals CO. | Marseilles | IL | — | ◇ UNVERIFIED |
| ILInnofab LLC | Milwaukee | WI | — | ◇ UNVERIFIED |
| IAInnovation Alley | Fresno | CA | — | ◇ UNVERIFIED |
| IIInnovative Industrial | Brownsville | TX | — | ◇ UNVERIFIED |
| IIInnovative Industrial Fabricators LLC | Keithville | LA | — | ◇ UNVERIFIED |
| ITInsituform Technology | Wrentham | MA | — | ◇ UNVERIFIED |
| ICInsulated Component Structures of Fl, INC. | Eustis | FL | — | ◇ UNVERIFIED |
| IMIntegrated Mechanical INC | Albany | OR | — | ◇ UNVERIFIED |
| ISIntegrated Steel | Brooksville | FL | — | ◇ UNVERIFIED |
| ITIntegrated Tower Systems | Tulsa | OK | — | ◇ UNVERIFIED |
| ITIntegrity Tool INC. | Ontario | NY | — | ◇ UNVERIFIED |
 Integrity Welding & Fabrication, INC. | Colorado Springs | CO | — | ◇ UNVERIFIED |
| IFIntelligent Fixtures | El Monte | CA | — | ◇ UNVERIFIED |
| ISIntelligent Steel Solutions, L.l.c. | New Orleans | LA | — | ◇ UNVERIFIED |
| ITIntelligent Tool CORP. | Mooresville | NC | — | ◇ UNVERIFIED |
| ISInternational Steel & Counterweights LLC | Youngstown | OH | — | ◇ UNVERIFIED |
| ISInternational Steel Framing | League City | TX | — | ◇ UNVERIFIED |
| IFIntersteel Fabrication INC | Louisville | KY | — | ◇ UNVERIFIED |
| ISIntl Special Attractions LLC | Puyallup | WA | — | ◇ UNVERIFIED |
| IGIntricate Grinding & Machine Specialties | Norton Shores | MI | — | ◇ UNVERIFIED |
| ISIpm Sales INC. | Canton | OH | — | ◇ UNVERIFIED |
| IPIpp-improved Piping Products, INC. | San Antonio | TX | — | ◇ UNVERIFIED |
| IBIpsco Baytown Works | Baytown | TX | — | ◇ UNVERIFIED |
| IOIrmw of Colorado, INC. | Aspen | CO | — | ◇ UNVERIFIED |
| IAIron Access, INC. | Houston | TX | — | ◇ UNVERIFIED |
| ICIron Crafters Security Products Inc | Ashland | MS | — | ◇ UNVERIFIED |
| IDIron Dog Fabrication INC | Santa Rosa | CA | — | ◇ UNVERIFIED |
| ILIronfab, LLC | Columbus | OH | — | ◇ UNVERIFIED |
| IFIron Fabrication Services, INC. | Jessup | MD | — | ◇ UNVERIFIED |
| IFIron Fence Specialists, INC. | Las Vegas | NV | — | ◇ UNVERIFIED |
| IIIronhead INC | Vale | OR | — | ◇ UNVERIFIED |
| IIIron Integrity LLC | Hayden | CO | — | ◇ UNVERIFIED |
| IOIronsmiths of Distinction, LLC | Phoenix | AZ | — | ◇ UNVERIFIED |
| IFIronwood Fabrication LLC | Bellingham | WA | — | ◇ UNVERIFIED |
| IWIron Works, INC. | Denton | MD | — | ◇ UNVERIFIED |
| IWIron Works, INC. | Milford | DE | — | ◇ UNVERIFIED |
| IIIsland Industries, INC. | Memphis | TN | — | ◇ UNVERIFIED |
| IBItw Building Components Group, INC | Litchfield | IL | — | ◇ UNVERIFIED |
| INItz Nc INC | Kenosha | WI | — | ◇ UNVERIFIED |
| IAIws Acquisition CORP | Portland | OR | — | ◇ UNVERIFIED |
