| SUSoutheastern Unipole INC | Bowling Green | KY | — | ◇ UNVERIFIED |
| SFSoutheast Fabricating, INC. | Cape Girardeau | MO | — | ◇ UNVERIFIED |
| SMSoutheast Mechanical Contractors | West Park | FL | — | ◇ UNVERIFIED |
| SASouthern Aluminum Finishing D.b.a. Saf Metal Fab | Villa Rica | GA | — | ◇ UNVERIFIED |
| SASouthern Aluminum Finishing D.b.a. Saf Metal Fab | Atlanta | GA | — | ◇ 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 |
| 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 |
| SSpacesonic | San Carlos | CA | — | ◇ UNVERIFIED |
| SWSpanier Welding & Metal Fabrication INC | Paynesville | MN | — | ◇ UNVERIFIED |
| SESpantex Expanded Metal, INC. | Lincolnton | NC | — | ◇ UNVERIFIED |
| SMSparhawk Metals, INC. | Lockwood | NV | — | ◇ UNVERIFIED |
| S5Spec 5 Steel INC | San Jose | CA | — | ◇ UNVERIFIED |
| SISpecht Industries,inc | Santa Clarita | CA | — | ◇ UNVERIFIED |
| SISpecial Iron Security Systems INC | South El Monte | CA | — | ◇ UNVERIFIED |
| SSSpeciality Stairs and Miscellaneous Fabrication INC | Pearl | MS | — | ◇ UNVERIFIED |
| SWSpecialized Welders | Torrance | CA | — | ◇ UNVERIFIED |
| SMSpecial Metal Works | Rayne | LA | — | ◇ UNVERIFIED |
| SPSpecial Products Energy | Canton | MA | — | ◇ UNVERIFIED |
| SBSpecialty Building Components | Pico Rivera | CA | — | ◇ UNVERIFIED |
| SMSpecialty Maint & Construction | Lakeland | FL | — | ◇ UNVERIFIED |
| SMSpecialty Manufacturing | Amesbury | MA | — | ◇ UNVERIFIED |
| SMSpecialty Metal Fabricators | Caledonia | MI | — | ◇ UNVERIFIED |
| SMSpecialty Metals Fabrication INC | Santee | CA | — | ◇ UNVERIFIED |
| SSSpecialty Steel Fabricators | Olympia | WA | — | ◇ UNVERIFIED |
| SSSpecialty Systems | Bloomington | MN | — | ◇ 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 |
| SSSpiral Stairs of America, LLC | Erie | PA | — | ◇ 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 |
| SSSportsman Steel Safes | Long Beach | CA | — | ◇ UNVERIFIED |
| SDSpot Design LLC | Ann Arbor | MI | — | ◇ UNVERIFIED |
| SSSprial Systems, INC. | Nesbit | MS | — | ◇ UNVERIFIED |
| SESpring Engineers of Dallas Dba Sei Metalforms | Dallas | TX | — | ◇ UNVERIFIED |
| SDSpx Dock Prods | Carrollton | TX | — | ◇ UNVERIFIED |
| SRS & R Architectural Metals INC | Anaheim | CA | — | ◇ UNVERIFIED |
| SLSrf LLC | Fredericksburg | VA | — | ◇ UNVERIFIED |
| SIS.R. Iron, Inc. | Windsor | CA | — | ◇ UNVERIFIED |
| SISr Iron INC | Healdsburg | CA | — | ◇ UNVERIFIED |
| SWSsab Wear Solutions LLC | Birmingham | AL | — | ◇ UNVERIFIED |
| SCSs Custom Fabrication, LLC | Redfield | AR | — | ◇ UNVERIFIED |
| SIS.s. Industries | Collegeville | PA | — | ◇ UNVERIFIED |
| SISs Industries Llc, Dba Salter Spiral Stair | Collegeville | PA | — | ◇ 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 |
| STS-square Tube Products, INC. | Commerce City | CO | — | ◇ UNVERIFIED |
| SLSt2 LLC | Placentia | CA | — | ◇ UNVERIFIED |
| SMStaco Manufacturing Dba Staco Decorative Iron | Hattiesburg | MS | — | ◇ UNVERIFIED |
| SCStaging Concepts INC | Minneapolis | MN | — | ◇ UNVERIFIED |
| SCStainless Cable & Railing, Inc | Washougal | WA | — | ◇ UNVERIFIED |
| SFStainless Fabricators, INC. | Belle Chasse | LA | — | ◇ UNVERIFIED |
| SAStairs and Rails INC. | Melrose Park | IL | — | ◇ UNVERIFIED |
| SSStaley Steel | Frisco | TX | — | ◇ UNVERIFIED |
| SIStandard Iron, INC. | Chattanooga | TN | — | ◇ UNVERIFIED |
| SIStandard Iron - Wire Works INC | Sauk Centre | MN | — | ◇ UNVERIFIED |
 Standard Machine Company, LLC | Scarborough | ME | — | ◇ UNVERIFIED |
| SSStandard Sculpture LLC | Los Angeles | CA | — | ◇ UNVERIFIED |
| SSStandard Steel Fabricating CO INC | Seattle | WA | — | ◇ UNVERIFIED |
| SRStanek Rack CO INC | Detroit | MI | — | ◇ UNVERIFIED |
| SAStarlite Aluminum Products INC. | Tulsa | OK | — | ◇ UNVERIFIED |
| SMStar Manufacturing,llc | Orange | CA | — | ◇ UNVERIFIED |
| SFState Fabricators | Livonia | MI | — | ◇ UNVERIFIED |
| SFState Fabricators, INC. | Farmingtn Hls | MI | — | ◇ UNVERIFIED |
| SOState of the Arc Welding LLC | Elba | NY | — | ◇ UNVERIFIED |
| SWState Welding & Fabricating, INC. | Wallingford | CT | — | ◇ UNVERIFIED |
| SISteelcad Industrial Services, INC. | Cutler | IL | — | ◇ UNVERIFIED |
