 Lippert Components | Rialto | CA | — | ◇ UNVERIFIED |
| Lippert Components, INC | Goshen | IN | — | ◇ UNVERIFIED |
| Lippert Components INC Plant 7 | Denver | PA | — | ◇ UNVERIFIED |
| Lippert Components Plant 084 | Nampa | ID | — | ◇ UNVERIFIED |
| Lippert Components Twin Falls 64 | Kimberly | ID | — | ◇ UNVERIFIED |
| LFL&m Fabrication & Machine Inc/ East Allen | Bath | PA | — | ◇ UNVERIFIED |
| LSLockport Steel Fabricators | Lockport | IL | — | ◇ UNVERIFIED |
| MSMarshall Steel Incorporated | Memphis | TN | — | ◇ UNVERIFIED |
| MSMatrix Service Fabrication Div | Catoosa | OK | — | ◇ UNVERIFIED |
| MOMetalcraft of Mayville | West Bend | WI | — | ◇ UNVERIFIED |
| MPMetal Pros | Wichita | KS | — | ◇ UNVERIFIED |
| MFMetals Fabrication | Airway Heights | WA | — | ◇ UNVERIFIED |
 Meyer Utility Structures, LLC Plant #1662 | Steele | AL | — | ◇ UNVERIFIED |
| Meyer Utility Structures LLC Plant 1665 | Lancaster | SC | — | ◇ UNVERIFIED |
| MAMft Acquisition CORP. (gerdau Ameristeel Formerly Operated at This Site) | Arlington | TN | — | ◇ UNVERIFIED |
| MSMica Steelworks Kaufman | Kaufman | TX | — | ◇ UNVERIFIED |
| MPMid-south Products INC Cape Girardeau | Cape Girardeau | MO | — | ◇ UNVERIFIED |
| MIMiller/greeneville INC. | Greeneville | TN | — | ◇ UNVERIFIED |
| MSMilton Steel CO | Milton | PA | — | ◇ UNVERIFIED |
| MTMississippi Tank and Manufacturing Company | Hattiesburg | MS | — | ◇ UNVERIFIED |
| MCModern Custom Fabrication INC | Fresno | CA | — | ◇ UNVERIFIED |
| MWModern Welding Company of California | Fresno | CA | — | ◇ UNVERIFIED |
| MWModern Welding CO of Tx | Rhome | TX | — | ◇ UNVERIFIED |
| MOMonotech of Mississippi | Iuka | MS | — | ◇ UNVERIFIED |
| MMMorton Metalcraft CO | Morton | IL | — | ◇ UNVERIFIED |
| MSMueller Systems | Cleveland | NC | — | ◇ UNVERIFIED |
| NPNekoosa Packaging, Memphis Boxplant | Memphis | TN | — | ◇ UNVERIFIED |
| NNelco | Houston | TX | — | ◇ UNVERIFIED |
| NLNeofab, LLC | Miami | OK | — | ◇ UNVERIFIED |
| NANew Alenco Windows LTD | Bryan | TX | — | ◇ UNVERIFIED |
| NMNew Millenium Building Systems LLC | Butler | IN | — | ◇ UNVERIFIED |
| NCNorris Cylinder | Longview | TX | — | ◇ UNVERIFIED |
| NVNucor Vulcraft Group - Grapeland Div | Grapeland | TX | — | ◇ UNVERIFIED |
| NVNucor Vulcraft Group Saint Joe Div | Saint Joe | IN | — | ◇ UNVERIFIED |
| OCOttenweller CO INC | Mount Airy | NC | — | ◇ UNVERIFIED |
| OSOwen Steel CO | Columbia | SC | — | ◇ UNVERIFIED |
| OSOwen Steel Company | Wilmington | DE | — | ◇ UNVERIFIED |
| OWO W Hubbell & Sons | Ny Mills | NY | — | ◇ UNVERIFIED |
| PWPampa Wind Tower Manufacturing Facility | Pampa | TX | — | ◇ UNVERIFIED |
| PFPasadena Fabrication Facility | Pasadena | TX | — | ◇ UNVERIFIED |
 Paul Mueller-paul Mueller | Springfield | MO | — | ◇ UNVERIFIED |
| PIPirod INC | Plymouth | IN | — | ◇ UNVERIFIED |
| PMPort Manatee Fl Lng Manufacturing Facility | Palmetto | FL | — | ◇ UNVERIFIED |
| PAPostle Aluminum (p0448) | Cassopolis | MI | — | ◇ UNVERIFIED |
| PLPrescor LLC | Tulsa | OK | — | ◇ UNVERIFIED |
| PSProspect Steel Company | Little Rock | AR | — | ◇ UNVERIFIED |
| QQsi | Dothan | AL | — | ◇ UNVERIFIED |
| QSQuality Steel CORP. | Cleveland | MS | — | ◇ UNVERIFIED |
| QCQuanex CORP | Chatsworth | IL | — | ◇ UNVERIFIED |
| RHRanch Hand Beeville | Beeville | TX | — | ◇ UNVERIFIED |
| RRocore-knoxville | Knoxville | TN | — | ◇ UNVERIFIED |
| RFRoll Forming Corporation | Jeffersonville | IN | — | ◇ UNVERIFIED |
| RIR-v Industries - New Morgan Plant | Morgantown | PA | — | ◇ UNVERIFIED |
| SMSabin Metal West CORP | Williston | ND | — | ◇ UNVERIFIED |
| SISabre Industries | Alvarado | TX | — | ◇ UNVERIFIED |
| SISabre Industries Conroe Tx Facility | Conroe | TX | — | ◇ UNVERIFIED |
| SISabre Industries Towers and Poles | Sioux City | IA | — | ◇ UNVERIFIED |
| SSSamuel Son and Company (usa) INC | Iuka | MS | — | ◇ UNVERIFIED |
 Sandmeyer Steel CO | Philadelphia | PA | — | ◇ UNVERIFIED |
| SFSapulpa Faclty | Sapulpa | OK | — | ◇ UNVERIFIED |
| SGSas Global Fka Sure Alloy Steel Corporation | Warren | MI | — | ◇ UNVERIFIED |
| STSauk Technologies | Saukville | WI | — | ◇ UNVERIFIED |
 Schuff Steel | Lindon | UT | — | ◇ UNVERIFIED |
| Schuff Steel | Bellemont | AZ | — | ◇ UNVERIFIED |
| Schuff Steel CO | Eloy | AZ | — | ◇ UNVERIFIED |
| Schuff Steel CO | Phoenix | AZ | — | ◇ UNVERIFIED |
| Schuff Steel Company | Stockton | CA | — | ◇ UNVERIFIED |
| Schuff Steel Gulf Coast | Humble | TX | — | ◇ UNVERIFIED |
| Schuff Steel Midwest | Ottawa | KS | — | ◇ UNVERIFIED |
| SOSfi of Arkansas | Conway | AR | — | ◇ UNVERIFIED |
| SOSfi of Tennessee | Memphis | TN | — | ◇ UNVERIFIED |
| S1Shape 1820 | Grand Haven | MI | — | ◇ UNVERIFIED |
| SMShugart Manufacturing | Chester | SC | — | ◇ UNVERIFIED |
| SSSkilcraft Sheetmetal INC | Burlington | KY | — | ◇ UNVERIFIED |
| SJSmi Joist:cayce | Cayce | SC | — | ◇ UNVERIFIED |
| SRSmi Rebar South Caroliina | Columbia | SC | — | ◇ UNVERIFIED |
| STSolar Turbines Turbofab Facility | Channelview | TX | — | ◇ UNVERIFIED |
| SOSouthern Ohio Fabricators | Batavia | OH | — | ◇ UNVERIFIED |
| SPSouthern Post Texas | San Marcos | TX | — | ◇ UNVERIFIED |
| SMSpectra Metal Sales INC | Atlanta | GA | — | ◇ UNVERIFIED |
| SCStandard Coating INC. | Madison Hts | MI | — | ◇ UNVERIFIED |
| SPStar Pipe USA | Coffeyville | KS | — | ◇ UNVERIFIED |
 Steele Solutions INC | South Milwaukee | WI | — | ◇ UNVERIFIED |
 Steelfab, INC. | York | SC | — | ◇ UNVERIFIED |
| Steelfab INC of Alabama | Roanoke | AL | — | ◇ UNVERIFIED |
| Steelfab, INC. - Texas Division | Durant | OK | — | ◇ UNVERIFIED |
| SISteelfab in Dublin Georgia INC | Dublin | GA | — | ◇ UNVERIFIED |
| SOSteelfab of Fayetteville | Fayetteville | NC | — | ◇ UNVERIFIED |
| Steelfab of Virginia, INC. | Emporia | VA | — | ◇ UNVERIFIED |
| SOSteelfab Oregon, INC. | Spokane | WA | — | ◇ UNVERIFIED |
| SFSteel Fabricators of Monroe LLC | Monroe | LA | — | ◇ UNVERIFIED |
| Steelfab West, INC. | Tangent | OR | — | ◇ UNVERIFIED |
| SKSteel King Industries INC | New London | WI | — | ◇ UNVERIFIED |
| SGSt George Steel Fabrication INC | Saint George | UT | — | ◇ UNVERIFIED |
| SSStructural Steel of Carolina | Hickory | NC | — | ◇ UNVERIFIED |
| SSStructural Steel Services INC Plant 2 | Meridian | MS | — | ◇ UNVERIFIED |
| SISwva INC | Huntington | WV | — | ◇ UNVERIFIED |
 Taylor Machine Works INC | Louisville | MS | — | ◇ UNVERIFIED |
| TSTemtco Steel INC | Chicago | IL | — | ◇ UNVERIFIED |
| TSTemtco Steel Tumwater | Tumwater | WA | — | ◇ UNVERIFIED |
