| SNSheldon North Yard | Channelview | TX | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SDSierra Design & Manufacturing | Modesto | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SIS & I Ironworks Corp. | Miami | FL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SISinnott Industries, INC. | Philadelphia | PA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SPSkinz Protective Gear | Paynesville | MN | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
 Skyline Steel | Kissimmee | FL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| Skyline Steel | Canon City | CO | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SASlob and Sons Pipe & Casing, INC. | Marion | OH | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SESnelling Employment, LLC | Odessa | TX | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SSSouthern Steel Specialists | Clermont | GA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SSSovereign Steel Manufacturing, LLC | Allentown | PA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SISpacewalker, INC. | Bonne Terre | MO | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SWSparkster Welding Fabrication & | Springtown | TX | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
 Springs Fabrication, INC | Loveland | CO | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SMStar Metals, Inc. | Jurupa Valley | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SPStar Pipe Products | Houston | TX | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| STStar Tubular Services Division | Lone Star | TX | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
 Steel Service Center, INC. | Lewiston | ME | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SSSteel Suppliers Erectors INC. | Wilmington | DE | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SPSterling Pipe & Tube, INC. | Toledo | OH | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SSSteven Steel Supply | Columbus | OH | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SGStone Gryphon Tactical LLC | Chula Vista | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SGSummit Global Contractors, INC. | Vidor | TX | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SISummit Iron Works Group INC | Gardena | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SSSummit Steel Corporation | Chagrin Falls | OH | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SMSuperior Metal Fabricators, INC. | Las Vegas | NV | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SSSusini Specialty Steels, INC. | Natrona Heights | PA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TITasco Iron & Metal, LLC | Lake Havasu City | AZ | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TMTaylor Metal Works & Pipe Co., INC. | Port Arthur | TX | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TTTech Tube Inc/upper Merion | King of Prussia | PA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TTTeda Tpco America Corporation | Gregory | TX | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TSTetra Steel Corporation | Montclair | NJ | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TSTetra Steel Corporation | Bronx | NY | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TSTexas Specialty Steel, LLC | San Antonio | TX | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TTTexas Tubular Products | Lone Star | TX | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TEThormax Enterprises, LLC | Columbus | IN | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TEThormax Enterprises, LLC | Columbus | IN | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TATi Automotive (formerly Bundy Corportation) | Warren | MI | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TGTi Group Automotive Systems LLC | Auburn Hills | MI | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TMTomco Machining INC | Dayton | OH | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TTTotten Tubes INC - Santee | Santee | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TMTransMachine MTT Inc. | Aurora | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TPTricon Piping System, INC. | Canastota | NY | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TPTrinity Products, INC. | Saint Charles | MO | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
 Trinity Stainless INC. | Nixa | MO | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TVTri Valley Iron INC. | Palisades | NY | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TSTryad Service CORP. | Shafter | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TUTubacex US Holding INC / Tubacex US Holding INC | Durant | OK | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TBTube Bending Specialists & Machinery, LLC | Hayward | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TNTubetech North America, INC. | E Palestine | OH | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
