| ICIndian Creek Fabricators INC. | Tipp City | OH | — | ◐ LIKELY ACTIVE |
Industrial Automation LLC - Alabama | Montgomery | AL | 1–19 | ◐ LIKELY ACTIVE |
| ICIndustrial Consortium INC | Lancaster | PA | — | ◐ LIKELY ACTIVE |
| IDIndustrial Design Manufacturing LLC | Mount Sterling | KY | — | ◐ LIKELY ACTIVE |
| IFIndustrial Fabrication LLC | Bridgman | MI | 20–99 | ◐ LIKELY ACTIVE |
| IMIndustrial Maintenance and Welding | Chicago | IL | 100–499 | ◐ LIKELY ACTIVE |
| IMIndustrial Manufacturing Services | Lancaster | SC | 20–99 | ◐ LIKELY ACTIVE |
| IMIndustrial Metal Enterprises LLC | Blackfoot | ID | 20–99 | ◐ LIKELY ACTIVE |
| IPIndustrial Products | Coon Rapids | MN | 20–99 | ◐ LIKELY ACTIVE |
| ISIndustrial Stripping Services LLC | Grand Rapids | MI | 20–99 | ◐ LIKELY ACTIVE |
| ITIndustrial Technologies Group ITG CA Design Raleigh | Raleigh | NC | 20–99 | ◐ LIKELY ACTIVE |
| ITIndustrial Technologies Group ITG Versatile Mold and Design | Rutledge | GA | 20–99 | ◐ LIKELY ACTIVE |
| ITIndustrial Technologies Group ITG WakefieldNashua | Nashua | NH | 100–499 | ◐ LIKELY ACTIVE |
| IIndy | Indianapolis | IN | 1–19 | ◐ LIKELY ACTIVE |
| IIIN-FAB Inc. | Bedford | IN | 20–99 | ◐ LIKELY ACTIVE |
| IDInfastech, Decorah MFG (IND, EF) Emhart Tecknologies LLC | Decorah | IA | 100–499 | ◐ LIKELY ACTIVE |
| IDInfinity Drain LTD | Amityville | NY | 100–499 | ◐ LIKELY ACTIVE |
| IFInfinity Finishing Services, Inc. | Fort Worth | TX | 1–19 | ◐ LIKELY ACTIVE |
| ITInlet Tools, INC | Conneautville | PA | — | ◐ LIKELY ACTIVE |
| IWInnisfallen Works | Springfield | OH | 20–99 | ◐ LIKELY ACTIVE |
| IMInnovations Manufacturing INC | Redding | CA | — | ◐ LIKELY ACTIVE |
| IEInnovative Engineered Solutions | Wilmington | OH | 20–99 | ◐ LIKELY ACTIVE |
| IMInnovative Mechanical Solutions LLC- IMECH | Houston | TX | 20–99 | ◐ LIKELY ACTIVE |
| IDInrock Drilling Systems | Houston | TX | 20–99 | ◐ LIKELY ACTIVE |
| IQInteger, QKP | Quakertown | PA | 100–499 | ◐ LIKELY ACTIVE |
| IMIntegrated Machining CO | Albuquerque | NM | — | ◐ LIKELY ACTIVE |
| IMIntegrated Machining Solutions INC | Norwalk | CA | — | ◐ LIKELY ACTIVE |
| IMIntegrated Manufacturing West Jefferson NC | West Jefferson | NC | 100–499 | ◐ LIKELY ACTIVE |
| IIIntegration INC | Albuquerque | NM | — | ◐ LIKELY ACTIVE |
| IEIntegrity Engineering Holding, Inc | Ramsey | MN | 20–99 | ◐ LIKELY ACTIVE |
| IMIntegrity Machining, INC | Augusta | IL | — | ◐ LIKELY ACTIVE |
| IMIntegrity Manufacturing CORP | Dayton | OH | — | ◐ LIKELY ACTIVE |
| ITIntegrity Tool INC | Batesville | IN | — | ◐ LIKELY ACTIVE |
| IVIntellectual Ventures Property Holdings LLC | Bellevue | WA | — | ◐ LIKELY ACTIVE |
| ICIntelligent Composites LLC | Milwaukee | WI | — | ◐ LIKELY ACTIVE |
| IMInter-city Manufacturing, INC. | Seaside | CA | — | ◐ LIKELY ACTIVE |
| IMInterconnection Marketing ,inc. | Canoga Park | CA | — | ◐ LIKELY ACTIVE |
| IDInternational Destination Trading LLC | Fort Lauderdale | FL | — | ◐ LIKELY ACTIVE |
| IQInternational Quality Advantage LLC | Windsor Mill | MD | — | ◐ LIKELY ACTIVE |
International Tool and Manufacturing, INC | Fairfield | NJ | — | ◐ LIKELY ACTIVE |
| ICIntra Corporation (1/1/2025-6/30/2025) | Westland | MI | 100–499 | ◐ LIKELY ACTIVE |
| IEIowa Engineered Procsses | Independence | IA | 20–99 | ◐ LIKELY ACTIVE |
| IGIPS Group, Inc Headquarters | San Diego | CA | 100–499 | ◐ LIKELY ACTIVE |
| IEIron Empire LLC | Surprise | AZ | — | ◐ LIKELY ACTIVE |
| IYISC - Youngstown, OH | Youngstown | OH | 100–499 | ◐ LIKELY ACTIVE |
| IIIsland Instrument CORP. | Deer Park | NY | — | ◐ LIKELY ACTIVE |
| IMIsland Machine, INC | Everett | WA | — | ◐ LIKELY ACTIVE |
| IPI.S. Parts International, Inc. dba Lattimer | Vineland | NJ | 20–99 | ◐ LIKELY ACTIVE |
| IMITC Manufacturing Phoenix | Phoenix | AZ | 100–499 | ◐ LIKELY ACTIVE |
| ICItech Custom Manufacturing and Design INC. | Riviera Beach | FL | — | ◐ LIKELY ACTIVE |