| 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 |
| IRInalfa Roof Systems - Cherokee Campus | Acworth | GA | 100–499 | ◐ LIKELY ACTIVE |
| IMIncremental Machine LLC | Baltimore | MD | — | ◐ LIKELY ACTIVE |
| IMIndependence MO PRIIS | Independence | MO | 20–99 | ◐ 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 |
| IWIndiana Wheel Company, LLC | Plymouth | IN | 20–99 | ◐ LIKELY ACTIVE |
| ICIndian Creek Fabricators INC. | Tipp City | OH | — | ◐ LIKELY ACTIVE |
| I1Indidge 1 Artistic Metal Works LLC | Independence | MO | — | ◐ LIKELY ACTIVE |
| IHInduction Heat Treating Seymour Corp | Seymour | IN | 1–19 | ◐ LIKELY ACTIVE |
| IHInduction Heat Treating Waukesha Corp. | Waukesha | WI | 1–19 | ◐ LIKELY ACTIVE |
Industrial Automation LLC - Alabama | Montgomery | AL | 1–19 | ◐ LIKELY ACTIVE |
| ICIndustrial Coating Services INC. | Stacy | MN | — | ◐ LIKELY ACTIVE |
| ICIndustrial Connections & Solutions LLC | Cary | NC | — | ◐ 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 |
| IFIndustrial Fabrication LLC | Bridgman | MI | 20–99 | ◐ LIKELY ACTIVE |
| IHIndustrial Heat Treat LLC | Salt Lake City | UT | — | ◐ LIKELY ACTIVE |
| IIINDUSTRIAL IRON WORKS, INC., dba ADAMS FERTILIZER EQUIPMENT | Dewitt | AR | 100–499 | ◐ 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 |
| IMIndustrial Mold Manufacturer | Grafton | WI | 20–99 | ◐ LIKELY ACTIVE |
| IPIndustrial Panel Solutions, Inc. | Omaha | NE | 1–19 | ◐ LIKELY ACTIVE |
| IPIndustrial Products | Coon Rapids | MN | 20–99 | ◐ LIKELY ACTIVE |
| IPIndustrial Products and Sales, LLC | Portsmouth | VA | — | ◐ LIKELY ACTIVE |
| IPIndustrial Products Group, LLC | Chesapeake | OH | — | ◐ LIKELY ACTIVE |
| ISIndustrial Stripping Services LLC | Grand Rapids | MI | 20–99 | ◐ LIKELY ACTIVE |
| ITIndustrial Tank & Containment INC | Brookfield | OH | — | ◐ LIKELY ACTIVE |
| ITIndustrial Technologies Group ITG Bartell | Rome | NY | 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 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 |
| IPInfinity Plast Automotive | Montgomery | AL | 20–99 | ◐ LIKELY ACTIVE |
| INInland NW Metallurgical | Spokane Valley | WA | 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 |