| IIIKS Industries, Inc. | Park Falls | WI | 20–99 | ◐ LIKELY ACTIVE |
| IPIlam Precision INC | San Jose | CA | — | ◐ LIKELY ACTIVE |
| IFImagination Fabrication Inc. | Mount Pleasant | TX | 20–99 | ◐ LIKELY ACTIVE |
| IMIMETCO / Merchant Evans | Burlington | NJ | 20–99 | ◐ LIKELY ACTIVE |
| IOImpact Operations | 8808 Grand River Ave | MI | 20–99 | ◐ LIKELY ACTIVE |
| IEImpres Engineering Services, LLC | Holland | MI | — | ◐ LIKELY ACTIVE |
| IHIMR - Hayden | North Vernon | IN | 20–99 | ◐ LIKELY ACTIVE |
| IBIMS Buhrke-Olson | Arlington Heights | IL | 100–499 | ◐ LIKELY ACTIVE |
| IAIN Acquisition LLC | Hudson | MA | 20–99 | ◐ LIKELY ACTIVE |
| IMIncremental Machine LLC | Baltimore | MD | — | ◐ LIKELY ACTIVE |
| IWIndependent Welding & Machine LLC | Cocoa | FL | — | ◐ LIKELY ACTIVE |
| IMIndiana Mobile Welding LLC | Cicero | IN | — | ◐ LIKELY ACTIVE |
| IIndianapolis | Indianapolis | IN | 100–499 | ◐ LIKELY ACTIVE |
| 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 |
| IEIndustrial Engineering Manufacturing Co, INC | Foxboro | MA | — | ▲ REPORTED CLOSED |
| IEIndustrial Engraving LLC | Pulaski, Wi | WI | 20–99 | ◐ LIKELY ACTIVE |
| IFIndustrial Fabrication LLC | Bridgman | MI | 20–99 | ◐ LIKELY ACTIVE |
| IMIndustrial Manufacturing Services | Lancaster | SC | 20–99 | ◐ LIKELY ACTIVE |
| IMIndustrial Metal Enterprises LLC | Blackfoot | ID | 20–99 | ◐ LIKELY ACTIVE |
| ISIndustrial Stripping Services LLC | Grand Rapids | MI | 20–99 | ◐ LIKELY ACTIVE |
| ITIndustrial Technologies Group ITG Bartell | Rome | NY | 100–499 | ◐ LIKELY ACTIVE |
| ITIndustrial Technologies Group ITG CA Design Exeter | Dover | NH | 100–499 | ◐ LIKELY ACTIVE |
| ITIndustrial Technologies Group ITG CA Design Raleigh | Raleigh | NC | 20–99 | ◐ LIKELY ACTIVE |
| ITIndustrial Technologies Group ITG Field Controls | Kinston | NC | 100–499 | ◐ LIKELY ACTIVE |
| ITIndustrial Technologies Group ITG Precision Engineering | Uxbridge | MA | 20–99 | ◐ LIKELY ACTIVE |
| ITIndustrial Technologies Group ITG WakefieldNashua | Nashua | NH | 100–499 | ◐ LIKELY ACTIVE |
| IFIndustries- Fresno | Fresno | CA | 20–99 | ◐ 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 |
| ILInnova LLC | Grapevine | TX | — | ◐ LIKELY ACTIVE |
| IFInnovation First Manufacturing, Inc. | Greenville | TX | 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 |
| IFIntegral Fabrication & Engineering, LLC | Orlando | FL | — | ◐ LIKELY ACTIVE |
| IMIntegrated Machining CO | Albuquerque | NM | — | ◐ LIKELY ACTIVE |
| IMIntegrated Machining Solutions INC | Norwalk | CA | — | ◐ LIKELY ACTIVE |
| IMIntegrated Manufacturing Additive Technology Center | West Chester | OH | 100–499 | ◐ LIKELY ACTIVE |
| IMIntegrated Manufacturing Asheville CMC | Asheville | NC | 100–499 | ◐ LIKELY ACTIVE |
| IMIntegrated Manufacturing Asheville Rotating Parts | Asheville | NC | 100–499 | ◐ LIKELY ACTIVE |
| IMIntegrated Manufacturing Auburn AL | Auburn | AL | 100–499 | ◐ LIKELY ACTIVE |
| IMIntegrated Manufacturing Batesville MS | Batesville | MS | 100–499 | ◐ LIKELY ACTIVE |
| IMIntegrated Manufacturing Dayton OH Unison | Dayton | OH | 100–499 | ◐ LIKELY ACTIVE |
| IMIntegrated Manufacturing DCCDayton | Dayton | OH | 20–99 | ◐ LIKELY ACTIVE |
| IMIntegrated Manufacturing Evendale OH | Cincinnati | OH | 500+ | ◐ LIKELY ACTIVE |
| IMIntegrated Manufacturing Greenville SC | Piedmont | SC | 100–499 | ◐ LIKELY ACTIVE |
| IMIntegrated Manufacturing Hooksett NH | Hooksett | NH | 500+ | ◐ LIKELY ACTIVE |
| IMIntegrated Manufacturing Lynn MA | Lynn | MA | 500+ | ◐ LIKELY ACTIVE |
| IMIntegrated Manufacturing Madisonville Ky | Madisonville | KY | 100–499 | ◐ LIKELY ACTIVE |
| IMIntegrated Manufacturing Muskegon MI | Norton Shores Muskegon | MI | 500+ | ◐ LIKELY ACTIVE |
| IMIntegrated Manufacturing Rutland VT | North Clarendon | VT | 500+ | ◐ LIKELY ACTIVE |
| IMIntegrated Manufacturing Terre Haute IN | Terre Haute | IN | 100–499 | ◐ LIKELY ACTIVE |
| IMIntegrated Manufacturing West Jefferson NC | West Jefferson | NC | 100–499 | ◐ LIKELY ACTIVE |
| IMIntegrated Manufacturing Wilmington NC | Castle Hayne | NC | 500+ | ◐ 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 |
| IVIntellectual Ventures Property Holdings LLC | Bellevue | WA | — | ◐ LIKELY ACTIVE |
| ISIntellifab Solutions LLC | Atlanta | GA | — | ◐ 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 |
International Computer Appliances Corporation | Minneapolis | MN | 100–499 | ◐ LIKELY ACTIVE |
| IQInternational Quality Advantage LLC | Windsor Mill | MD | — | ◐ LIKELY ACTIVE |
International Tool and Manufacturing, INC | Fairfield | NJ | — | ◐ LIKELY ACTIVE |
| ICInterplanetary Concepts, LLC | New Smyrna Beach | FL | — | ◐ LIKELY ACTIVE |
| IGIPS Group, Inc Headquarters | San Diego | CA | 100–499 | ◐ LIKELY ACTIVE |
| IDir Distributers D. B. A. The Metal Shop | Dunnellon | FL | 20–99 | ◐ LIKELY ACTIVE |
| IEIron Empire LLC | Surprise | AZ | — | ◐ LIKELY ACTIVE |
| ICIsa (wyoming) CORP | Evanston | WY | — | ◐ 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 |
| ICItech Custom Manufacturing and Design INC. | Riviera Beach | FL | — | ◐ LIKELY ACTIVE |
| IBITW Building Components Group Inc - Earth City, MO | Earth City | MO | 1–19 | ◐ LIKELY ACTIVE |
| IBITW Building Components Group Inc - Ft. Lauderdale | Fort Lauderdale | FL | 20–99 | ◐ LIKELY ACTIVE |
| IBITW Building Components Group Inc - Glenview, IL | Glenview | IL | 500+ | ◐ LIKELY ACTIVE |
| IBITW Building Components Group Inc - Grand Prairie, TX | Grand Prairie | TX | 20–99 | ◐ LIKELY ACTIVE |
| IBITW Building Components Group Inc - Litchfield | Litchfield | IL | 20–99 | ◐ LIKELY ACTIVE |
| IBITW Building Components Group Inc - Orlando | Orlando | FL | 1–19 | ◐ LIKELY ACTIVE |
| IBITW Building Components Group Inc - Pontotoc, MS | Pontotoc | MS | 20–99 | ◐ LIKELY ACTIVE |
| IBITW Building Components Group Inc - Sacramento, CA | Sacramento | CA | 1–19 | ◐ LIKELY ACTIVE |
| ICITW Commercial Construction North America | Paris | KY | 20–99 | ◐ LIKELY ACTIVE |
| ICITW Commercial Construction North America | Itasca | IL | 20–99 | ◐ LIKELY ACTIVE |
| ICITW Commercial Construction North America- Glenview | Glenview | IL | 20–99 | ◐ LIKELY ACTIVE |
| IDITW Dynatec | Hendersonville | TN | 20–99 | ◐ LIKELY ACTIVE |
| IHITW Heartland - Manufactured Products | Alexandria | MN | 20–99 | ◐ LIKELY ACTIVE |
| ISITW Shakeproof - Elgin | Elgin | IL | 100–499 | ◐ LIKELY ACTIVE |
| ISITW StampTech Fasteners | Gallatin | TN | 100–499 | ◐ LIKELY ACTIVE |