| SFShaw Fabrication & Manufacturing, INC. | Baton Rouge | LA | — | ◇ UNVERIFIED |
| SFShawnee Fabricators | Shawnee | OK | — | ◇ UNVERIFIED |
| SFShawnee Fabricators, INC. | Shawnee | OK | — | ◇ UNVERIFIED |
| SSShawnee Steel Company | Shawnee | OK | — | ◇ UNVERIFIED |
| SMSheldon Mechanical Corporation | Santa Clarita | CA | — | ◇ UNVERIFIED |
| SSShenkle Steel LLC | Madison | VA | — | ◇ UNVERIFIED |
| SMSherwood Manufacturing Corporation | Northport | MI | — | ◇ UNVERIFIED |
| SBShew Brothers INC. | Marion | IL | — | ◇ UNVERIFIED |
| SMShiner Manufacturing INC. | Shiner | TX | — | ◇ UNVERIFIED |
| SBShollenbarger - Borella INC Dba Golden State Steel | Fowler | CA | — | ◇ UNVERIFIED |
| SIShoreline Industries, INC. | Portsmouth | VA | — | ◇ UNVERIFIED |
| SMShow Me Welding and Fabrication, LLC | Curryville | MO | — | ◇ UNVERIFIED |
| SHS & H Welding INC Dba S & H Metals | Sacramento | CA | — | ◇ UNVERIFIED |
| SMSieckmann Metal Fab INC | Eagle Creek | OR | — | ◇ UNVERIFIED |
| SCSierra CIS, Inc. | Placerville | CA | — | ◇ UNVERIFIED |
| SSSigma Steel Incorporated | Bedford | IN | — | ◇ UNVERIFIED |
| SSSilver State | Las Vegas | NV | — | ◇ UNVERIFIED |
| SISimko Industrial Fabricators | Hammond | IN | — | ◇ UNVERIFIED |
| SCSimplex Construction Supplies | Blaine | MN | — | ◇ UNVERIFIED |
| SNSimplex Nails, INC. | Americus | GA | — | ◇ UNVERIFIED |
| SMSimply Mfg (former) | Prairie Du Sac | WI | — | ◇ UNVERIFIED |
| SSSimpson Strong Tie | Riverside | CA | — | ◇ UNVERIFIED |
| SMSincere Metal Works | Amesbury | MA | — | ◇ UNVERIFIED |
| SISindr Industries Inc | Mt Clemens | MI | — | ◇ UNVERIFIED |
| SSSingle Source INC | Tallahassee | FL | — | ◇ UNVERIFIED |
| SISitemaster, INC. | Slidell | LA | — | ◇ UNVERIFIED |
| SRSite Resources, LLC | Raleigh | NC | — | ◇ UNVERIFIED |
| SLSjjr, LLC | Taunton | MA | — | ◇ UNVERIFIED |
| SISkaggs Iron Works, INC. | Memphis | TN | — | ◇ UNVERIFIED |
| SKS & K Machineworks Company, INC. | Theodore | AL | — | ◇ UNVERIFIED |
| SCSkrlin Coating & Blasting INC. | Niagara Falls | NY | — | ◇ UNVERIFIED |
| SDSkycomm Development, INC | Helena | MT | — | ◇ UNVERIFIED |
 Skyline Steel Berkeley Facility | Huger | SC | — | ◇ UNVERIFIED |
| Skyline Steel INC. | San Francisco | CA | — | ◇ UNVERIFIED |
| Skyline Steel, INC. | Chandler | AZ | — | ◇ UNVERIFIED |
| SSSlide Systems INC | Harbor City | CA | — | ◇ UNVERIFIED |
| SLSmart Laser & Manufacturing LLC | Forney | TX | — | ◇ UNVERIFIED |
| SSSmede-son Steel & Building Supply Company | Brighton | MI | — | ◇ UNVERIFIED |
| SISme Industries, INC. | Las Vegas | NV | — | ◇ UNVERIFIED |
| SISme Industries, Incorporated | West Jordan | UT | — | ◇ UNVERIFIED |
| SSSme Steel Contractors, INC. | West Jordan | UT | — | ◇ UNVERIFIED |
| SSSme Steel Fabrication | West Jordan | UT | — | ◇ UNVERIFIED |
 Smith Ironworks of Atlanta | Atlanta | GA | — | ◇ UNVERIFIED |
| SMS & M Steel Fab INC | Beaverton | OR | — | ◇ UNVERIFIED |
| SMSnell Manufacturing, LLC | Cottontown | TN | — | ◇ UNVERIFIED |
| SVSnell Ventures, LLC | Bradford | TN | — | ◇ UNVERIFIED |
 Snyder Mfg. CO. | New Sharon | IA | — | ◇ UNVERIFIED |
| SSSo-cal Structural Steel Fabrication INC | Marina Del Rey | CA | — | ◇ UNVERIFIED |
| SFSolid Form Fabrication INC | Mcminnville | OR | — | ◇ UNVERIFIED |
| SFSomerville Fabricators, INC | Mineral Wells | WV | — | ◇ UNVERIFIED |
| SWSonco Worldwide INC | Bladensburg | MD | — | ◇ UNVERIFIED |
| SCSonic Component Systems LLC | Corsicana | TX | — | ◇ UNVERIFIED |
| SSSonne Steel INC. | Smithfield | KY | — | ◇ UNVERIFIED |
| SSSopris Steel Construction, Inc. | New Castle | CO | — | ◇ UNVERIFIED |
| SASouth Anna Stair and Rail Company INC | Ashland | VA | — | ◇ UNVERIFIED |
| SCSouth Central Steel Inc. | Harpersville | AL | — | ◇ UNVERIFIED |
| SCSouth Coast Commercial | San Diego | CA | — | ◇ UNVERIFIED |
| SCSouth County Steel, INC. | West Kingston | RI | — | ◇ UNVERIFIED |
| SCSoutheastern Container | Gautier | MS | — | ◇ UNVERIFIED |
| SUSoutheastern Unipole INC | Bowling Green | KY | — | ◇ UNVERIFIED |
| SFSoutheast Fabricating, INC. | Cape Girardeau | MO | — | ◇ UNVERIFIED |
| SMSoutheast Mechanical Contractors | West Park | FL | — | ◇ UNVERIFIED |
| SBSouthern Boiler Service INC. | Lakeland | FL | — | ◇ UNVERIFIED |
| SFSouthern Fabrication Contractors LLC | Chattanooga | TN | — | ◇ UNVERIFIED |
| SFSouthern Fab & Supports, INC. | Conroe | TX | — | ◇ UNVERIFIED |
| SISouthern Industrial Metal Fabricators INC | Smyrna | GA | — | ◇ UNVERIFIED |
| SMSouthern Metal Products CO INC | Louisville | KY | — | ◇ UNVERIFIED |
| SNSouthern Nevada Welding, INC. | Las Vegas | NV | — | ◇ UNVERIFIED |
| SRSouthern Rail and Company, INC. | Fort Walton Beach | FL | — | ◇ UNVERIFIED |
| SRSouthern Rigging and Erection of Louisburg, Incorp | Cary | NC | — | ◇ UNVERIFIED |
| SSSouthern Steel - Wire Incorporated | Madison | NC | — | ◇ UNVERIFIED |
| SSSouthern Structural Steel, INC. | Chesapeake | VA | — | ◇ UNVERIFIED |
| SFSouth Florida Aluminum INC. | Lake Worth | FL | — | ◇ UNVERIFIED |
| SFSouthland Fabricators, LLC | Walker | LA | — | ◇ UNVERIFIED |
| SSSouth Shore Iron Works | Chicago | IL | — | ◇ UNVERIFIED |
| STSouth Texas Steel Service Company LLC | Victoria | TX | — | ◇ UNVERIFIED |
| SCSouthwestern Creations LLC | South West City | MO | — | ◇ UNVERIFIED |
| SWSouthwestern Wire Cloth, INC. | Broken Arrow | OK | — | ◇ UNVERIFIED |
| SFSouthwest Fabricators | Hugo | OK | — | ◇ UNVERIFIED |
| SSSouthwest Steel Fabrication LLC | Kansas City | MO | — | ◇ UNVERIFIED |
| SSSouthwest Steel, Llc, a Nevada Limited Liability Company | El Mirage | AZ | — | ◇ UNVERIFIED |
| SCSouthwire Company | Carrollton | GA | — | ◇ UNVERIFIED |
| SWSpanier Welding & Metal Fabrication INC | Paynesville | MN | — | ◇ UNVERIFIED |
| SMSparhawk Metals, INC. | Lockwood | NV | — | ◇ UNVERIFIED |
| S5Spec 5 Steel INC | San Jose | CA | — | ◇ UNVERIFIED |
| SISpecht Industries,inc | Santa Clarita | CA | — | ◇ UNVERIFIED |
| SWSpecialized Welders | Torrance | CA | — | ◇ UNVERIFIED |
| SMSpecialty Maint & Construction | Lakeland | FL | — | ◇ UNVERIFIED |
| SMSpecialty Metals Fabrication INC | Santee | CA | — | ◇ UNVERIFIED |
| SSSpecialty Steel Fabricators | Olympia | WA | — | ◇ UNVERIFIED |
| SISpecsys INC | Prentice | WI | — | ◇ UNVERIFIED |
| SPSpencer Products INC | North Brookfield | MA | — | ◇ UNVERIFIED |
| SISpengler Industries | Salt Lake City | UT | — | ◇ UNVERIFIED |
| SCSpf Corporation of America | Houston | TX | — | ◇ UNVERIFIED |
| SSSpherion Staffing Services | Little Rock | AR | — | ◇ UNVERIFIED |
| SPSpika Properties, LLC | Lewistown | MT | — | ◇ UNVERIFIED |
| SFSpirit Fabs, INC. | Green Bay | WI | — | ◇ UNVERIFIED |
| SOSpm Oil & Gas - Fort Lupton | Fort Lupton | CO | — | ◇ UNVERIFIED |
| SSSportsman Steel Safe Fabricating CO | Long Beach | CA | — | ◇ UNVERIFIED |
| SDSpot Design LLC | Ann Arbor | MI | — | ◇ UNVERIFIED |
