| MDMetalution Deepdraw Tooling and Design, LLC | Holland | MI | — | ◇ UNVERIFIED |
| MVMetal Vision INC. | Smithfield | UT | — | ◇ UNVERIFIED |
| MWMetal Works Corporation | Baton Rouge | LA | — | ◇ UNVERIFIED |
| MHMetalworks Hawaii LLC | Honolulu | HI | — | ◇ UNVERIFIED |
| MIMetalworks, Inc. | Lincoln | NE | — | ◇ UNVERIFIED |
| MWMetal Works INC | Lexington | SC | — | ◇ UNVERIFIED |
| MWMetal Works INC. | Londonderry | NH | — | ◇ UNVERIFIED |
| MWMetal Works Performance, Inc | Saint Charles | IL | — | ◇ UNVERIFIED |
| MWMetal Work US, Inc. | Des Plaines | IL | — | ◇ UNVERIFIED |
| MFMet Fab International, INC. | Waynesboro | VA | — | ◇ UNVERIFIED |
| MLMetkote Laminated Prod/taylor Plt | Taylor | PA | — | ◇ UNVERIFIED |
| MIMet-l-fab INC | Londonderry | NH | — | ◇ UNVERIFIED |
| MIMetl-fab, INC. | Omaha | NE | — | ◇ UNVERIFIED |
| MBMetro Boiler Tube Company, INC. | Gonzales | LA | — | ◇ UNVERIFIED |
| MMMetro Manufacturing INC | Saint Paul | MN | — | ◇ UNVERIFIED |
| MMMetro Metal Supply, INC. | Denver | CO | — | ◇ UNVERIFIED |
| MCMetroplex Conveyor & Services, LLC | Quinlan | TX | — | ◇ UNVERIFIED |
| MFMetroplex Fabrication and Erection, LLP | Azle | TX | — | ◇ UNVERIFIED |
| MSMetroplex Sheet Metal II LLC | Garland | TX | — | ◇ UNVERIFIED |
| MSMetro Sales and Assembly, INC. | Broken Arrow | OK | — | ◇ UNVERIFIED |
| MSMetro Steel | Spring Valley | CA | — | ◇ UNVERIFIED |
| MTMetro Test and Balance, INC. | Capitol Heights | MD | — | ◇ UNVERIFIED |
| MAMetso Automation USA INC Dba Stonel | Fergus Falls | MN | — | ◇ UNVERIFIED |
| MBMetwood Building Solutions | Boones Mill | VA | — | ◇ UNVERIFIED |
| MCMexico City Iron Works | San Francisco | CA | — | ◇ UNVERIFIED |
| MHMexico Heating Co., INC. | Mexico | MO | — | ◇ UNVERIFIED |
| MLMeyerbrooks, LLC | Oregon | WI | — | ◇ UNVERIFIED |
| MCMeyers Construction INC | Madera | CA | — | ◇ UNVERIFIED |
 Meyer Utility Structures, LLC Plant No. 1663 | Hager City | WI | — | ◇ UNVERIFIED |
| MRMfg. Resources, INC. | Rochester | NY | — | ◇ UNVERIFIED |
| MDM&g Duravent, INC. | Albany | NY | — | ◇ UNVERIFIED |
| MHM & H Metal Specialties INC | Irving | TX | — | ◇ UNVERIFIED |
| MHM & H Metal Specialties, INC. | Dallas | TX | — | ◇ UNVERIFIED |
| MMMHS Management LLC | Pleasant Grove | UT | — | ◇ UNVERIFIED |
| MAMichael A. Melton (EPC) | Shelby | NC | — | ◇ UNVERIFIED |
| MEMichael E Taylor | Oregon City | OR | — | ◇ UNVERIFIED |
| MZMichal Zieba | Brooklyn | NY | — | ◇ UNVERIFIED |
| MIMichelman-cancelliere Iron Works, INC. | Bath | PA | — | ◇ UNVERIFIED |
| MSMichelman Steel | Allentown | PA | — | ◇ UNVERIFIED |
| MMMichigan Magna INC | Romulus | MI | — | ◇ UNVERIFIED |
| MSMichigan Steel Industries INC Dba Michigan Steel Strapping | Detroit | MI | — | ◇ UNVERIFIED |
| MMMicra Manufacturing | Hugo | MN | — | ◇ UNVERIFIED |
| MMMicro Matic Usa, INC | Northridge | CA | — | ◇ UNVERIFIED |
| MMMicro Metl Corporation | Sparks | NV | — | ◇ UNVERIFIED |
| MPMicrotek Pattern Inc | Decatur | IL | — | ◇ UNVERIFIED |
| MMicrotome | Colorado Springs | CO | — | ◇ UNVERIFIED |
| MTMicro Tool - Mold INC | Shafer | MN | — | ◇ UNVERIFIED |
| MSMid-america Steel Products, INC. | Corning | AR | — | ◇ UNVERIFIED |
| MMMidas Metal Works, LLC | Etna | OH | — | ◇ UNVERIFIED |
| MSMid-atlantic Steel, LLC | New Castle | DE | — | ◇ UNVERIFIED |
