| 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 |
| 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 Tank Service, LLC | Henderson | KY | 1–19 | ◐ 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 |
| IMInter-city Manufacturing, INC. | Seaside | CA | — | ◐ LIKELY ACTIVE |
| IMInterconnection Marketing ,inc. | Canoga Park | CA | — | ◐ LIKELY ACTIVE |
| IMInterior Mobile Welding & Services INC | Fairbanks | AK | — | ◐ LIKELY ACTIVE |
International Computer Appliances Corporation | Minneapolis | MN | 100–499 | ◐ 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 |
| ICInterplanetary Concepts, LLC | New Smyrna Beach | FL | — | ◐ LIKELY ACTIVE |
| ICIntra Corporation (1/1/2025-6/30/2025) | Westland | MI | 100–499 | ◐ LIKELY ACTIVE |
| IGIPS Group, Inc Headquarters | San Diego | CA | 100–499 | ◐ LIKELY ACTIVE |
| IGIra G Steffy & Son, Inc. | Ephrata | PA | 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 |
| ISIron Sharpens Iron Welding & Fabricating, INC | Minneola | FL | — | ◐ LIKELY ACTIVE |
| ISIrwin Steel LLC | Justin | TX | 100–499 | ◐ 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 |
| ILIstanbul Logistics Aluminum Trading LLC | Vienna | VA | — | ◐ 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 |
| IFITW FEG Troy Plant | Troy | OH | 100–499 | ◐ 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 |
| IJIvan Jukic & Jure Jukic Partners | Milford | CT | — | ◐ LIKELY ACTIVE |