| ITIndustrial Tank & Containment INC | Brookfield | OH | — | ◐ 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 |
| IFIndustrias Feliciano Aluminum, INC. | Aguadilla | PR | — | ◐ LIKELY ACTIVE |
| IEInfin8 Enterprises LLC | Bixby | OK | — | ◐ LIKELY ACTIVE |
| ITInlet Tools, INC | Conneautville | PA | — | ◐ LIKELY ACTIVE |
| ICInner City Bleu S LLC | Detroit | MI | — | ◐ LIKELY ACTIVE |
| IAInnerface Architectural Signage INC | Atlanta | GA | — | ◐ LIKELY ACTIVE |
| ICInnomark Communications- 420 | Fairfield | OH | 100–499 | ◐ LIKELY ACTIVE |
| IFInnovation First Manufacturing, Inc. | Greenville | TX | 20–99 | ◐ LIKELY ACTIVE |
| IEInnovative Engineered Solutions | Wilmington | OH | 20–99 | ◐ LIKELY ACTIVE |
| ITInnovent Technologies, LLC/Main Office - Peaboby, MA | Peabody | MA | 20–99 | ◐ LIKELY ACTIVE |
| IOIn Our Gear, LLC | Manchester | MD | — | ◐ LIKELY ACTIVE |
| IDInrock Drilling Systems | Houston | TX | 20–99 | ◐ LIKELY ACTIVE |
| IFIntegral Fabrication & Engineering, LLC | Orlando | FL | — | ◐ LIKELY ACTIVE |
| IPIntegratech Proteomics, LLC | Salt Lake City | UT | — | ◐ LIKELY ACTIVE |
| IMIntegrated Machining CO | Albuquerque | NM | — | ◐ LIKELY ACTIVE |
| IMIntegrated Machining Solutions INC | Norwalk | CA | — | ◐ LIKELY ACTIVE |
| IOIntegrated Openings Solutions, LLC | Olathe | KS | — | ◐ 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 | San Antonio | TX | 100–499 | ◐ LIKELY ACTIVE |
| ITIntegrity Tank Service, LLC | Henderson | KY | 1–19 | ◐ LIKELY ACTIVE |
| IVIntellectual Ventures Property Holdings LLC | Bellevue | WA | — | ◐ LIKELY ACTIVE |
| ISIntellifab Solutions LLC | Atlanta | GA | — | ◐ LIKELY ACTIVE |
| IMInter-city Manufacturing, INC. | Seaside | CA | — | ◐ LIKELY ACTIVE |
| ICInternational C & C Corp. | Largo | FL | 20–99 | ◐ 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 |
| ICIntersign Corporation | Chattanooga | TN | 100–499 | ◐ LIKELY ACTIVE |
| IVInterstate Visual Solutions, LLC | Apollo Beach | FL | — | ◐ LIKELY ACTIVE |
| ISInterwest Safety Arizona | Goodyear | AZ | 1–19 | ◐ LIKELY ACTIVE |
| ISInterwest Safety Colorado | Denver | CO | 1–19 | ◐ LIKELY ACTIVE |
| ISInterwest Safety Nevada | Las Vegas | NV | 1–19 | ◐ LIKELY ACTIVE |
| ISInterwest Safety New Mexico | Albuquerque | NM | 1–19 | ◐ LIKELY ACTIVE |
| ISInventive Solutions LLC | Virginia Beach | VA | — | ◐ LIKELY ACTIVE |
| IDir Distributers D. B. A. The Metal Shop | Dunnellon | FL | 20–99 | ◐ LIKELY ACTIVE |
| IMIsland Machine, INC | Everett | WA | — | ◐ LIKELY ACTIVE |
| ICItech Custom Manufacturing and Design INC. | Riviera Beach | FL | — | ◐ LIKELY ACTIVE |
| IFITL Fostoria | Fostoria | OH | 20–99 | ◐ LIKELY ACTIVE |
| ILItl LLC | Hampton | VA | — | ◐ LIKELY ACTIVE |
| IMITL Moses Lake | Moses Lake | WA | 20–99 | ◐ 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 |