| JAJamestown Advanced Products, CORP. | Jamestown | NY | Fabricated Metal Product Manufacturing332439 | 100-499 | ◐ LIKELY ACTIVE |
| JEJax Enterprises, LLC | Jacksonville | FL | Fabricated Metal Product Manufacturing332311 | 20-99 | ◐ LIKELY ACTIVE |
| JEJax Enterprises, LLC | Jacksonville | FL | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| JSJaypro Sports, LLC | Waterford | CT | Fabricated Metal Product Manufacturing332999 | — | ◐ LIKELY ACTIVE |
| JCJbt Corporation | Grafton | WI | Fabricated Metal Product Manufacturing332999 | 20-99 | ◐ LIKELY ACTIVE |
| JPJ&e Precision Machining, INC. | San Jose | CA | Fabricated Metal Product Manufacturing332710 | — | ◐ LIKELY ACTIVE |
| JJJim James Enterprises, INC. | Chatsworth | CA | Fabricated Metal Product Manufacturing332999 | — | ◐ LIKELY ACTIVE |
| JJJ J Engineering INC | Los Alamitos | CA | Fabricated Metal Product Manufacturing332710 | — | ◐ LIKELY ACTIVE |
| JIJmfg, INC. | North Hollywood | CA | Fabricated Metal Product Manufacturing332999 | — | ◐ LIKELY ACTIVE |
| KIKampersal, INC. | Dedham | MA | Fabricated Metal Product Manufacturing332999 | — | ◐ LIKELY ACTIVE |
| KTKawasaki TN | Morristown | TN | Fabricated Metal Product Manufacturing332999 | 100-499 | ◐ LIKELY ACTIVE |
| KCKbh CORP | Clarksdale | MS | Fabricated Metal Product Manufacturing332999 | — | ◐ LIKELY ACTIVE |
| KFK&h Fabricators | Smithville | TX | Fabricated Metal Product Manufacturing332999 | 20-99 | ◐ LIKELY ACTIVE |
| KNKinston Neuse Corporation | Kinston | NC | Fabricated Metal Product Manufacturing332999 | — | ◐ LIKELY ACTIVE |
| KNKitagawa Northtech, INC. | Schaumburg | IL | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| KKKSH - KUKA Systems N.A. LLC | Sterling Heights | MI | Fabricated Metal Product Manufacturing332999 | 500+ | ◐ LIKELY ACTIVE |
| LELacrosse Enclosures Incorporated | Albany | KY | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| LSLake Shore Systems, INC. | Ontonagon | MI | Fabricated Metal Product Manufacturing332999 | — | ◐ LIKELY ACTIVE |
| LCLatitude CORP | Manning | SC | Fabricated Metal Product Manufacturing332999 | 100-499 | ◐ LIKELY ACTIVE |
| LSLaurel Sheet Metal Products, INC | N Hollywood | CA | Fabricated Metal Product Manufacturing332322 | — | ◐ LIKELY ACTIVE |
| LOLeitner-poma of America, INC. | Grand Jct | CO | Fabricated Metal Product Manufacturing332999 | — | ◐ LIKELY ACTIVE |
| LSLenco - Stuart | Stuart | FL | Fabricated Metal Product Manufacturing332999 | 20-99 | ◐ LIKELY ACTIVE |
| LELincoln Electric Additive Solutions | Euclid | OH | Fabricated Metal Product Manufacturing332999 | 20-99 | ◐ LIKELY ACTIVE |
| LWL & W Engineering-axis | Britton | MI | Fabricated Metal Product Manufacturing332999 | — | ◐ LIKELY ACTIVE |
| LSLyle Signs INC | De Smet | SD | Fabricated Metal Product Manufacturing332999 | — | ◐ LIKELY ACTIVE |
| LMLyons Machine Tool Co., INC. | Saint Augustine | FL | Fabricated Metal Product Manufacturing332721 | 1-19 | ◐ LIKELY ACTIVE |
| MIMachinists INC | Seattle | WA | Fabricated Metal Product Manufacturing332710 | 100-499 | ◐ LIKELY ACTIVE |
| MIMae-eitel, INC | Orwigsburg | PA | Fabricated Metal Product Manufacturing332999 | 20-99 | ◐ LIKELY ACTIVE |
| MCMagnetic Component Engineering | Torrance | CA | Nonmetallic Mineral Product Manufacturing327113 | 20-99 | ◐ LIKELY ACTIVE |
| MMMagnum Magnetics Corporation | Marietta | OH | Fabricated Metal Product Manufacturing332510 | — | ◐ LIKELY ACTIVE |
| MManitex | Georgetown | TX | Fabricated Metal Product Manufacturing332999 | — | ◐ LIKELY ACTIVE |
| MTManor Tool & Mfg CO | Schiller Park | IL | Fabricated Metal Product Manufacturing332999 | 20-99 | ◐ LIKELY ACTIVE |
| MSMartin Sprocket & Gear Sacramento | Sacramento | CA | Fabricated Metal Product Manufacturing332999 | 20-99 | ◐ LIKELY ACTIVE |
| MMMathison Manufacturing | Waukesha | WI | Fabricated Metal Product Manufacturing332999 | 20-99 | ◐ LIKELY ACTIVE |
| MFMccann Fabrication | New Gloucester | ME | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| MMMcelroy Manufacturing Incorporated | Tulsa | OK | Fabricated Metal Product Manufacturing332999 | — | ◐ LIKELY ACTIVE |
| MMMcleod Machine Works, INC. | Beaumont | TX | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| MMMEC - Mayville North | Mayville | WI | Fabricated Metal Product Manufacturing332000 | 20-99 | ◐ LIKELY ACTIVE |
| MWMec Wayland | Wayland | MI | Fabricated Metal Product Manufacturing332999 | 20-99 | ◐ LIKELY ACTIVE |
| MIMel-co-ed INC. | Pawtucket | RI | Fabricated Metal Product Manufacturing332999 | — | ◐ LIKELY ACTIVE |
| MMMetalfab Manufacturing, INC | Mio | MI | Fabricated Metal Product Manufacturing332999 | — | ◐ LIKELY ACTIVE |
| MSMetal Services of Blooming Prairie | Blooming Prairie | MN | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| MCMetal-tech Cage LLC | Newberg | OR | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| MPMetal-tech Partners | Bruning | NE | Fabricated Metal Product Manufacturing332312 | — | ◐ LIKELY ACTIVE |
| MPMetaltech Products INC. | Lebanon | MO | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| MIMetcom INC | Cookeville | TN | Fabricated Metal Product Manufacturing332116 | 20-99 | ◐ LIKELY ACTIVE |
| MIMicrogroup INC | Medway | MA | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| MCMicrometl Corporation | Indianapolis | IN | Fabricated Metal Product Manufacturing332322 | 100-499 | ◐ LIKELY ACTIVE |
| MWMiddle West Mfg. CORP. | Menomonee Falls | WI | Fabricated Metal Product Manufacturing332313 | 20-99 | ◐ LIKELY ACTIVE |
| MMMidstate Manufacturing Company | Galesburg | IL | Fabricated Metal Product Manufacturing332710 | 100-499 | ◐ LIKELY ACTIVE |