| 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 |
| IYISC - Youngstown, OH | Youngstown | OH | 100–499 | ◐ LIKELY ACTIVE |
| IIIsland Instrument CORP. | Deer Park | NY | — | ◐ LIKELY ACTIVE |