| IFIndustrial Fabricators, INC. | Chattanooga | TN | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| IFIndustrial Fabricators/south Plant | Gastonia | NC | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| ISIndustrial Steel LLC | Titusville | FL | Fabricated Metal Product Manufacturing332117 | 20-99 | ◐ LIKELY ACTIVE |
| ISIntegrity Steel Supply LLC | Mapleton | ND | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| JMJasper Materials Company, Inc.- Surebuilt Galvanizing | Jasper | TN | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| JEJax Enterprises, LLC | Jacksonville | FL | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| JCJennmar Corporation of East Virginia, INC | Rich Creek | VA | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| JGJHI Group / Firelands Fab | New London | OH | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| JCJL Components, LLC | Kansas City | MO | Fabricated Metal Product Manufacturing332311 | 20-99 | ◐ LIKELY ACTIVE |
| JLJ & L Fabricators, INC. | Leeds | AL | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| JTJohnson Thermal Systems | Nampa | ID | Fabricated Metal Product Manufacturing332311 | 100-499 | ◐ LIKELY ACTIVE |
| JMJones Machine & Welding CO INC | Oakman | AL | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| JVJones Valley Fabrication - Plant 2 | Oneonta | AL | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| JFJordan Fabricating INC | Cleveland | TN | Fabricated Metal Product Manufacturing332312 | 1-19 | ◐ LIKELY ACTIVE |
| JSJorgensen Steel Machining & Fabrication INC. | Tekonsha | MI | Primary Metal Manufacturing331513 | — | ◐ LIKELY ACTIVE |
| KAK and T Steel Corporation | Twin Falls | ID | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| KFKappers Fabricating INC | Spring Valley | MN | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| KSKasco Structures LLC | El Paso | TX | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| KTKcb Towers, INC. | Banning | CA | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| KMKeywell Metals LLC | Matthews | NC | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| KGK & G Associates INC | Colorado Springs | CO | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| KSKinsley Steel, Inc | York | PA | Fabricated Metal Product Manufacturing332312 | 100-499 | ◐ LIKELY ACTIVE |
| KSKinston Steel | Kinston | NC | Fabricated Metal Product Manufacturing332312 | 100-499 | ◐ LIKELY ACTIVE |
| KFK&k Fabrication, INC. | Austin | MN | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| KCKonitz Construction INC | Tarpon Spgs | FL | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| KKuest | San Antonio | TX | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| LELacrosse Enclosures Incorporated | Albany | KY | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| LALake Area Equipment Maintenance, INC. | Lake Charles | LA | Fabricated Metal Product Manufacturing332312 | 1-19 | ◐ LIKELY ACTIVE |
| LSLapeyre Stair, INC. | New Orleans | LA | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| LMLaurel Machine and Foundry, Front Street | Laurel | MS | Primary Metal Manufacturing331221 | 20-99 | ◐ LIKELY ACTIVE |
| LTLaurel Technologies Partnership | Largo | FL | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| LFLb Foster Company - Bedford Plant | Bedford | PA | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| LMLeatherwood Manufacturing INC | North Charleston | SC | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| LFLinco Fab, Inc | Saint Michael | MN | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| LCLincoln Contracting and Equipment Company, Inc. - SCA | Somerset | PA | Fabricated Metal Product Manufacturing332312 | 1-19 | ◐ LIKELY ACTIVE |
| LSLiphart Steel CO INC | Richmond | VA | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
Lippert Components 19 Complex | Goshen | IN | Fabricated Metal Product Manufacturing332312 | 500+ | ◐ LIKELY ACTIVE |
| LIL&n Industries | Rushville | IL | Primary Metal Manufacturing331110 | 1-19 | ◐ LIKELY ACTIVE |
| LWL & W Fab & Machine, INC. | Temple | GA | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| LSLynchburg Steel & Specialty Company | Abingdon | VA | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| LSLyndon Steel, LLC | Winston Salem | NC | Fabricated Metal Product Manufacturing332312 | 100-499 | ◐ LIKELY ACTIVE |
| MFMagnum Fire & Safety Systems | Port Arthur | TX | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| MUMalach USA | Valley City | ND | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| MSMarbury Steel Fabricators, INC. | Marbury | AL | Fabricated Metal Product Manufacturing332312 | 1-19 | ◐ LIKELY ACTIVE |
| MMMartin's Metal Fabrication & Welding, INC | Vacaville | CA | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| MRMason Road Sheet Metal | Houston | TX | Fabricated Metal Product Manufacturing332312 | 100-499 | ◐ LIKELY ACTIVE |
| MMMatcor Metal Fabrication | Welcome | NC | Fabricated Metal Product Manufacturing332312 | 100-499 | ◐ LIKELY ACTIVE |
| MWMaxwell Welding & Machine | Burgettstown | PA | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| MFMccann Fabrication | New Gloucester | ME | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| MIMcgregor Ind Inc/dunmore Plt | Dunmore | PA | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |