| ILInnova LLC | Grapevine | TX | — | ◐ LIKELY ACTIVE |
| IFInnovation First Manufacturing, Inc. | Greenville | TX | 20–99 | ◐ LIKELY ACTIVE |
| IMInnovations Manufacturing INC | Redding | CA | — | ◐ LIKELY ACTIVE |
| IAInnovative Aspects LLC | Houston | TX | — | ▲ REPORTED CLOSED |
| 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 |
| ICInsingerMachine Company | Philadelphia | PA | 20–99 | ◐ LIKELY ACTIVE |
| IWInsteel Wire Products Home offices | Mount Airy | NC | 100–499 | ◐ LIKELY ACTIVE |
| IWInsteel Wire Products KYW | Hickman | KY | 20–99 | ◐ LIKELY ACTIVE |
| IWInsteel Wire Products NCW | Mount Airy | NC | 100–499 | ◐ LIKELY ACTIVE |
| IWInsteel Wire Products OHW | Upper Sandusky | OH | 20–99 | ◐ LIKELY ACTIVE |
| IWInsteel Wire Products TXS | Houston | TX | 20–99 | ◐ LIKELY ACTIVE |
| IEInstitutional Equipment INC | Bolingbrook | IL | — | ◐ LIKELY ACTIVE |
| INInteger N2 Surface Technologies | Woonsocket | MA | 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 |
| IPIntegrated Power Services Liberty OH Service Center | Liberty Township | OH | 1–19 | ◐ LIKELY ACTIVE |
| IPIntegrated Power Services Switchgear Solutions Service Center | Tucson | AZ | 20–99 | ◐ LIKELY ACTIVE |
| IIIntegration INC | Albuquerque | NM | — | ◐ LIKELY ACTIVE |
| IIIntegricoat, INC. | Spring Lake | MI | — | ◐ 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 |
| ISIntellifab Solutions LLC | Atlanta | GA | — | ◐ LIKELY ACTIVE |
| ICIntelligent Composites LLC | Milwaukee | WI | — | ◐ LIKELY ACTIVE |
| IGIntellisteel Group LLC | Groveland | FL | 1–19 | ◐ LIKELY ACTIVE |
| ICInter-city Contracting, INC | Smithfield | RI | — | ◐ LIKELY ACTIVE |
| IMInter-city Manufacturing, INC. | Seaside | CA | — | ◐ LIKELY ACTIVE |