| 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 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 |
| IMIndustrial Machine & Mfg CO | South El Monte | CA | — | ◇ UNVERIFIED |
| IMIndustrial Manufacturing and Installations, Inc | Sedalia | CO | — | ◇ 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 |
| ILInesh LLC | Phoenix | AZ | — | ◇ UNVERIFIED |
| ICInfra-metals CO. | Marseilles | IL | — | ◇ UNVERIFIED |
| ILInnofab LLC | Milwaukee | WI | — | ◇ UNVERIFIED |
| IIInnovations in Iron INC | Eugene | OR | — | ◇ UNVERIFIED |
| IAInnovative Architectural Solutions INC | Ontario | CA | — | ◇ UNVERIFIED |
| IIInnovative Industrial | Brownsville | TX | — | ◇ UNVERIFIED |
| IIInnovative Industrial Fabricators LLC | Keithville | LA | — | ◇ UNVERIFIED |
| IMInnovative Metal Design INC | Troutdale | OR | — | ◇ UNVERIFIED |
| IMInnovative Metal Solutions | Mount Holly | NJ | — | ◇ UNVERIFIED |
| IIInstatech Industries, Inc. | Oakland Park | FL | — | ◇ 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 |
| IIntellicept | El Cajon | CA | — | ◇ UNVERIFIED |
| IFIntelligent Fixtures | El Monte | CA | — | ◇ UNVERIFIED |
| ISIntelligent Steel Solutions, L.l.c. | New Orleans | LA | — | ◇ UNVERIFIED |
| ITIntelligent Tool CORP. | Mooresville | NC | — | ◇ UNVERIFIED |
| IIInternational Iron Works LLC | Arvada | CO | — | ◇ UNVERIFIED |
| ISInternational Steel & Counterweights LLC | Youngstown | OH | — | ◇ UNVERIFIED |
| ISInternational Steel Framing | League City | TX | — | ◇ UNVERIFIED |
| IWInternational West, INC Dba Continental Industries | Anaheim | CA | — | ◇ UNVERIFIED |
| IWInternational Wrought Iron Lt | Chino | CA | — | ◇ UNVERIFIED |
| IFIntersteel Fabrication INC | Louisville | KY | — | ◇ UNVERIFIED |
| ISIntl Special Attractions LLC | Puyallup | WA | — | ◇ UNVERIFIED |
| IGIntricate Grinding & Machine Specialties | Norton Shores | MI | — | ◇ UNVERIFIED |
| IOIrmw of Colorado, INC. | Aspen | CO | — | ◇ UNVERIFIED |
| IAIron Access, INC. | Houston | TX | — | ◇ UNVERIFIED |
