| 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 |
| 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 | Pocatello | ID | — | ◇ UNVERIFIED |
| SSSme Steel Contractors, INC. | West Jordan | UT | — | ◇ UNVERIFIED |
| SSSme Steel Fabrication | West Jordan | UT | — | ◇ UNVERIFIED |
| SJSmi Joist Sc | Eastover | SC | — | ◇ UNVERIFIED |
| SSSmi Steel Fabricators, INC. Dba Cmc Rebar-orlando | Kissimmee | FL | — | ◇ UNVERIFIED |
 Smith Ironworks of Atlanta | Atlanta | GA | — | ◇ UNVERIFIED |
| SASmooth As Glass LTD | Englewood | CO | — | ◇ UNVERIFIED |
| SMS & M Steel Fab INC | Beaverton | OR | — | ◇ UNVERIFIED |
| SMSnell Manufacturing, LLC | Cottontown | TN | — | ◇ UNVERIFIED |
| SVSnell Ventures, LLC | Bradford | TN | — | ◇ UNVERIFIED |
| SSSo-cal Structural Steel Fabrication INC | Marina Del Rey | CA | — | ◇ UNVERIFIED |
| SISoelzer, INC Dba Firestone Fabricators | Signal Hill | CA | — | ◇ UNVERIFIED |
| SFSolid Form Fabrication INC | Mcminnville | OR | — | ◇ UNVERIFIED |
| SFSomerville Fabricators, INC | Mineral Wells | WV | — | ◇ UNVERIFIED |
| SSSonne Steel INC | Smithfield | KY | — | ◇ UNVERIFIED |
| SSSonne Steel INC. | Smithfield | KY | — | ◇ UNVERIFIED |
| SSSopris Steel Construction, Inc. | New Castle | CO | — | ◇ UNVERIFIED |
| SASousa and Demayo INC | North Attleboro | MA | — | ◇ 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 |
| SPSoutheastern Plateworks | Birmingham | AL | — | ◇ 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 |
| SBSouthern Boiler & Tank Works, Incorporat | Memphis | TN | — | ◇ UNVERIFIED |
| SESouthern Erectors INC | Pensacola | 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 Machinery CORP | Lakeland | FL | — | ◇ UNVERIFIED |
| SMSouthern Metal Products CO INC | Louisville | KY | — | ◇ UNVERIFIED |
| SMSouthern Metals Company of Mississippi INC | Laurel | MS | — | ◇ 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 Comapny Limited Liability Company | Charlotte | NC | — | ◇ UNVERIFIED |
| SSSouthern Structural Steel, INC. | Chesapeake | VA | — | ◇ UNVERIFIED |
| SSSouthern Structural Steel Incorporated | Smithfield | VA | — | ◇ UNVERIFIED |
| SSSouthern Structural Steel of Fl, INC | Saint Petersburg | FL | — | ◇ UNVERIFIED |
| SWSouthern Wheel & Rim | Jacksonville | FL | — | ◇ UNVERIFIED |
| SFSouth Florida Aluminum INC. | Lake Worth | FL | — | ◇ UNVERIFIED |
| SGSouth Gate Engineering LLC | Chino | CA | — | ◇ UNVERIFIED |
| SFSouthland Fabricators, LLC | Walker | LA | — | ◇ UNVERIFIED |
| SSSouth Shore Iron Works | Chicago | IL | — | ◇ UNVERIFIED |
| SSSouth Sligo Compressor Station | Sligo | LA | — | ◇ UNVERIFIED |
| STSouth Texas Steel Service Company LLC | Victoria | TX | — | ◇ UNVERIFIED |
| SVSouth Valley Mfg | Springfield | MO | — | ◇ UNVERIFIED |
| SHSouthwestern Hollow Metal | Raton | NM | — | ◇ UNVERIFIED |
| SSSouthwestern Supply & Machine Works* | Saint Joseph | MO | — | ◇ 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 |
| 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 |
| SPSpecial Products Energy | Canton | MA | — | ◇ UNVERIFIED |
| SMSpecialty Maint & Construction | Lakeland | FL | — | ◇ UNVERIFIED |
| SMSpecialty Manufacturing | Amesbury | MA | — | ◇ UNVERIFIED |
| SMSpecialty Metals Fabrication INC | Santee | CA | — | ◇ UNVERIFIED |
| SSSpecialty Steel Fabricators | Olympia | WA | — | ◇ UNVERIFIED |
| SISpecsys INC | Prentice | WI | — | ◇ 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 |
| SSpincraft | Billerica | MA | — | ◇ UNVERIFIED |
| SLSpire, LLC | Troy | VA | — | ◇ 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 |
| SESpring Engineers of Dallas Dba Sei Metalforms | Dallas | TX | — | ◇ UNVERIFIED |
| SDSpx Dock Prods | Carrollton | TX | — | ◇ UNVERIFIED |
| SLSrf LLC | Fredericksburg | VA | — | ◇ UNVERIFIED |
| SISr Iron INC | Healdsburg | CA | — | ◇ UNVERIFIED |
| SWSsab Wear Solutions LLC | Birmingham | AL | — | ◇ UNVERIFIED |
| SCSs Custom Fabrication, LLC | Redfield | AR | — | ◇ UNVERIFIED |
| SSS & S International, INC. | Carol Stream | IL | — | ◇ UNVERIFIED |
| SSS & S International, INC. of Illinois | Carol Stream | IL | — | ◇ UNVERIFIED |
| SSS & S Metal Fabricators | Chamois | MO | — | ◇ UNVERIFIED |
| SSS & S Midwest Fabricating, LLC | Morris | IL | — | ◇ UNVERIFIED |
| SLSt2 LLC | Placentia | CA | — | ◇ UNVERIFIED |
| SStaffmark | Sheridan | AR | — | ◇ UNVERIFIED |
| SFStainless Fabricators, INC. | Belle Chasse | LA | — | ◇ UNVERIFIED |
