| IIInterlock Industries, INC. | Independence | MO | — | ◇ UNVERIFIED |
| ICIntermountain Concrete Specialties | Idaho Falls | ID | — | ◇ UNVERIFIED |
| ISIntermountain Superform INC | American Fork | UT | — | ◇ UNVERIFIED |
| IMInternational Manufacturers Representatives | Baton Rouge | LA | — | ◇ UNVERIFIED |
| ISInternational Steel & Counterweights LLC | Youngstown | OH | — | ◇ UNVERIFIED |
| ISInternational Steel Framing | League City | TX | — | ◇ UNVERIFIED |
| ISInternational Steel Service Corporation | Los Angeles | CA | — | ◇ UNVERIFIED |
| ISInternational Steel Service Corporation | Compton | CA | — | ◇ UNVERIFIED |
| ITInternational Titanium Corporation | New Brighton | PA | — | ◇ UNVERIFIED |
| ITInternational Tool, INC. | Trempealeau | WI | — | ◇ UNVERIFIED |
| IMInterstate Manufacturing INC | Portland | OR | — | ◇ UNVERIFIED |
| IFIntersteel Fabrication INC | Louisville | KY | — | ◇ UNVERIFIED |
| ISIntl Special Attractions LLC | Puyallup | WA | — | ◇ UNVERIFIED |
| IGIntricate Grinding & Machine Specialties | Norton Shores | MI | — | ◇ UNVERIFIED |
| IRInvacare Respiratory Prods Group | Sanford | FL | — | ◇ UNVERIFIED |
| ISInvisible Structures, INC. | Aurora | CO | — | ◇ UNVERIFIED |
| ITIowa Techniques, INC. | Hutto | TX | — | ◇ UNVERIFIED |
| IFIpc Fabricators LLC | Tulsa | OK | — | ◇ UNVERIFIED |
| IPIpp-improved Piping Products, INC. | San Antonio | TX | — | ◇ UNVERIFIED |
| IBIpsco Baytown Works | Baytown | TX | — | ◇ UNVERIFIED |
| ICIql CORP | Louisville | KY | — | ◇ UNVERIFIED |
| ICIql Corporation | Louisville | KY | — | ◇ UNVERIFIED |
| IOIrmw of Colorado, INC. | Aspen | CO | — | ◇ UNVERIFIED |
| IAIron Access, INC. | Houston | TX | — | ◇ UNVERIFIED |
| ICIron City Iron Works Inc | Tarrant | AL | — | ◇ UNVERIFIED |
| ICIron Crafters Security Products Inc | Ashland | MS | — | ◇ UNVERIFIED |
| IDIron Design By Jeremy, LLC | Birmingham | AL | — | ◇ 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 |
| IFIron Fortress Security | Columbus | OH | — | ◇ UNVERIFIED |
| IIIronhead INC | Vale | OR | — | ◇ UNVERIFIED |
| IIIron Integrity LLC | Hayden | CO | — | ◇ UNVERIFIED |
| ILIronluxe, LLC | Phoenix | AZ | — | ◇ UNVERIFIED |
| ISIronman Safe Company, LLC | Dalton Gardens | ID | — | ◇ UNVERIFIED |
| IOIronsmiths of Distinction, LLC | Phoenix | AZ | — | ◇ UNVERIFIED |
| I5Ironwood 53 LLC | Rock Valley | IA | — | ◇ UNVERIFIED |
| IFIronwood Fabrication LLC | Bellingham | WA | — | ◇ UNVERIFIED |
| IWIron Works, INC. | Milford | DE | — | ◇ UNVERIFIED |
| IWIron Works, INC. | Denton | MD | — | ◇ UNVERIFIED |
| IIIsland Industries, INC. | Memphis | TN | — | ◇ UNVERIFIED |
| INIsuzu North America CORP. | Buena Park | CA | — | ◇ UNVERIFIED |
| INItz Nc INC | Kenosha | WI | — | ◇ UNVERIFIED |
| IAIws Acquisition CORP | Portland | OR | — | ◇ UNVERIFIED |
| J6J 6 Investments, LLC | Henderson | NV | — | ◇ UNVERIFIED |
 Jack A. Farrior, INC. | Farmville | NC | — | ◇ UNVERIFIED |
| JKJack Kennedy Metal Products & Bldgs INC | Langleyville | IL | — | ◇ UNVERIFIED |
| JFJackson Fabrication | Franklin | GA | — | ◇ UNVERIFIED |
| JSJacksonville Steel Company | Little Rock | AR | — | ◇ UNVERIFIED |
