 Schuff Steel-gulf Coast Airline Drive Facility | Houston | TX | — | ◇ UNVERIFIED |
| SBSchulte Building Systems | Effingham | IL | — | ◇ UNVERIFIED |
| SPSc Products, INC. | Eldorado | IL | — | ◇ UNVERIFIED |
| SCScrew Conveyor Pacific CORP | Visalia | CA | — | ◇ UNVERIFIED |
| SMScully's Metal Fabrication, INC. | Morgan City | LA | — | ◇ UNVERIFIED |
| SSScw Scrape Certify Welding | Fallbrook | CA | — | ◇ UNVERIFIED |
| SDS. Diamond Steel INC. | Iowa City | IA | — | ◇ UNVERIFIED |
| SISdi INC. | Sherman | IL | — | ◇ UNVERIFIED |
| SBSea Box | Cinnaminson | NJ | — | ◇ UNVERIFIED |
| SSeabox | Cinnaminson | NJ | — | ◇ UNVERIFIED |
| SBSea Box INC. | Cinnaminson | NJ | — | ◇ UNVERIFIED |
| SCSeaFab Corporation | Seattle | WA | — | ◇ UNVERIFIED |
| SSSea Side Specialties INC. | Delray Beach | FL | — | ◇ UNVERIFIED |
| SHSecurity Holdings, LLC | Carlstadt | NJ | — | ◇ UNVERIFIED |
| SISeizmic INC | Pomona | CA | — | ◇ UNVERIFIED |
| SSSelect Steel Incorporated | Ottawa | KS | — | ◇ UNVERIFIED |
| SFSelman Fabricating Company, INC. | Bessemer | AL | — | ◇ UNVERIFIED |
| SISemco Incorporated Chillicothe | Chillicothe | MO | — | ◇ UNVERIFIED |
| SMSeminole Machine & Welding, INC. | Largo | FL | — | ◇ UNVERIFIED |
| SISentinel Intelligence Group LLC | Brookpark | OH | — | ◇ UNVERIFIED |
| SMSerett Metalworks | Brooklyn | NY | — | ◇ UNVERIFIED |
| SFSerpa Fabrication, INC. | Corpus Christi | TX | — | ◇ UNVERIFIED |
| SISewell Industrial, INC. | Shelby | NC | — | ◇ UNVERIFIED |
| SFSfs Fabrication | Tulsa | OK | — | ◇ UNVERIFIED |
| SFShane Felter Industries | Uniontown | PA | — | ◇ UNVERIFIED |
| SFShane Fonseca | Westlake Village | CA | — | ◇ UNVERIFIED |
| SSShane Stone Inc. | Roseburg | OR | — | ◇ UNVERIFIED |
| SCShape CORP 144th Facility | Spring Lake | MI | — | ◇ UNVERIFIED |
| SCShape CORP 1900 Facility | Grand Haven | MI | — | ◇ UNVERIFIED |
| SSShape Steel | Liberty | MO | — | ◇ UNVERIFIED |
| STSharkey Technology Group INC. Dba C & T Machining | Burbank | CA | — | ◇ UNVERIFIED |
| SIShatone, INC. | Whitesburg | GA | — | ◇ UNVERIFIED |
| 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 |
| SPShaw Process Fabricators | West Monroe | LA | — | ◇ UNVERIFIED |
| SSShaw Sss Fabricators | Addis | LA | — | ◇ UNVERIFIED |
| SSShelby Steel LLC | Pell City | AL | — | ◇ UNVERIFIED |
| SSShelco Steel Works INC | South Holland | IL | — | ◇ 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 |
| STSheyenne Tooling & Mfg CO | Cooperstown | ND | — | ◇ 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 |
| SASiag Aerisyn LLC | Chattanooga | TN | — | ◇ UNVERIFIED |
| SLSic Lazaro US INC | Milwaukee | WI | — | ◇ UNVERIFIED |
| SMSieckmann Metal Fab INC | Eagle Creek | OR | — | ◇ UNVERIFIED |
| SCSierra CIS, Inc. | Placerville | CA | — | ◇ UNVERIFIED |
| SSSigma Steel Incorporated | Bedford | IN | — | ◇ UNVERIFIED |
| SISimko Industrial Fabricators | Hammond | IN | — | ◇ UNVERIFIED |
| SCSimplex Construction Supplies | Blaine | MN | — | ◇ UNVERIFIED |
| SMSimply Mfg (former) | Prairie Du Sac | WI | — | ◇ UNVERIFIED |
| SSSimpson Strong Tie | Riverside | CA | — | ◇ UNVERIFIED |
| SSSimpson Strong Tie CORP | Stockton | 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 |
| SCSix C Fabrication INC | Winnfield | LA | — | ◇ 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 |
| 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 |
| 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 |
