| HHeadquarters | Houston | 100–499 | ◐ LIKELY ACTIVE |
| HTHeil Trailer International LLC | Gatesville | — | ◐ LIKELY ACTIVE |
| HSHelicopter Services Group, INC. | Fort Worth | — | ◐ LIKELY ACTIVE |
| HHerdcommoditiesllc | Houston | — | ◐ LIKELY ACTIVE |
| HSHippocampus Submersible Equipment LLC | Katy | — | ◐ LIKELY ACTIVE |
| HIHolley Inc. - MSD | El Paso | 100–499 | ◐ LIKELY ACTIVE |
| HUHolman Upfitting - Fort Worth | Fort Worth | 20–99 | ◐ LIKELY ACTIVE |
| HGHouston Global Distribution LLC | Tomball | — | ◐ LIKELY ACTIVE |
| HUHouston Upfit | Houston | 1–19 | ◐ LIKELY ACTIVE |
| HTHunter Trailers, LLC | El Paso | — | ◐ LIKELY ACTIVE |
| IGIasa Group LLC | Southlake | — | ◐ LIKELY ACTIVE |
| IGImperial Group | Decatur | 100–499 | ◐ LIKELY ACTIVE |
| ITInland Truck Parts Company 22 | Fort Worth | 20–99 | ◐ LIKELY ACTIVE |
| ITInland Truck Parts Company 30 | Irving | 20–99 | ◐ LIKELY ACTIVE |
| ITInland Truck Parts Company 33 | Austin | 20–99 | ◐ LIKELY ACTIVE |
| ITInland Truck Parts Company 39 | San Antonio | 20–99 | ◐ LIKELY ACTIVE |
| IPInquest Power, LLC | Katy | — | ◐ LIKELY ACTIVE |
| IMIntegrated Manufacturing CFAN San Marcos TX | San Marcos | 500+ | ◐ LIKELY ACTIVE |
| IIIntegrity Inspections & Consulting LLC | Rosharon | — | ◐ LIKELY ACTIVE |
ITI Engineering Fort Worth Office | Fort Worth | 1–19 | ◐ LIKELY ACTIVE |
| JLJeanie Ladell INC | Weatherford | — | ◐ LIKELY ACTIVE |
| JPJeffery P Morin | Fredericksburg | — | ◐ LIKELY ACTIVE |
| JEJet Engine Support INC. | Farmers Branch | — | ◐ LIKELY ACTIVE |
| JWJones & Whitaker LLC | Red Oak | — | ◐ LIKELY ACTIVE |
| JSJudnni Solutions LTD | Richmond | — | ▲ REPORTED CLOSED |
| KHKada Holdings, INC. | Houston | — | ◐ LIKELY ACTIVE |
| KMKathleen Marie Kiesling | Fort Worth | — | ◐ LIKELY ACTIVE |
| KWKbr Wyle Services, LLC | Webster | — | ◐ LIKELY ACTIVE |
| KKKemet Konnections INC | Spring | — | ◐ LIKELY ACTIVE |
| KOKiewit Offshore Services, Ltd._2440 Kiewit Road | Ingleside | 500+ | ◐ LIKELY ACTIVE |
| KCKinetic Custom Trailers USA Inc. | Waco | 1–19 | ◐ LIKELY ACTIVE |
| KPKingdom Precision Machining LLC | Burleson | — | ◐ LIKELY ACTIVE |
| KTKit Turbines LLC | Houston | — | ◐ LIKELY ACTIVE |
| KPK&k Pilot Car Services L.l.c. | Spring | — | ◐ LIKELY ACTIVE |
| KTKnapheide Truck Equipment Company Southwest | Red Oak | 20–99 | ◐ LIKELY ACTIVE |
| LAL3Harris AS IAS Waco | Waco | 500+ | ◐ LIKELY ACTIVE |
| LTL3Harris Technologies, Integrated Systems L.P. (Greenville) | Greenville | 500+ | ◐ LIKELY ACTIVE |
| LWLive Wire Customs, LLC | Cleburne | — | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation Grand Prairie Campus (1435) | Grand Prairie | 500+ | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation HOUSTON-2100 SPACE PARK DRIVE (3537) | Houston | 100–499 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation Lufkin (1551) | Lufkin | 100–499 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation TX-Fort Worth-FAA Blvd (5445) | Fort Worth | 20–99 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation US TX Dallas 1727 S Main St (5267) | Dallas | 100–499 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation US TX Fort Worth Lockheed Blvd (1093) | Fort Worth | 500+ | ◐ LIKELY ACTIVE |
| LSLone Star Assembly (Challenge Manufacturing Plant 6) | Irving | 100–499 | ◐ LIKELY ACTIVE |
| LSLone Star Aviation CORP | Mansfield | — | ▲ REPORTED CLOSED |
| LSLone Star Tire and Axle | Corsicana | 20–99 | ◐ LIKELY ACTIVE |
| LMLoram Maintenance of Way Inc (Georgetown) | Georgetown | 20–99 | ◐ LIKELY ACTIVE |
| L7Lucky 7 Logistics | Dallas | 20–99 | ◐ LIKELY ACTIVE |
| LWL Woodard - Isr - Defense Consulting, INC | Caddo Mills | — | ◐ LIKELY ACTIVE |