| SSStahl Specialty Co-warrensburg Plant | Warrensburg | MO | Primary Metal Manufacturing331521 | 20-99 | ● ACTIVE |
| SSStandard Steel-burnham Plant | Burnham | PA | Primary Metal Manufacturing331110 | 500+ | ● ACTIVE |
| SMState Metal Industries INC | Camden | NJ | Primary Metal Manufacturing331314 | 20-99 | ● ACTIVE |
| SDSteel Dust Recycling LLC | Millport | AL | Primary Metal Manufacturing331410 | 100-499 | ● ACTIVE |
| SDSteel Dynamics Heartland | Terre Haute | IN | Primary Metal Manufacturing331110 | 100-499 | ● ACTIVE |
Steel Edge, INC | Las Vegas | NV | Primary Metal Manufacturing331210 | — | ● ACTIVE |
Steel Forgings, INC. | Shreveport | LA | Primary Metal Manufacturing331210 | 20-99 | ● ACTIVE |
| SISteelscape INC | Kalama | WA | Primary Metal Manufacturing331111 | 100-499 | ● ACTIVE |
Stephens Pipe & Steel LLC | Russell Springs | KY | Primary Metal Manufacturing331210 | 100-499 | ● ACTIVE |
Sterling Metal Works LLC | Sterling Heights | MI | Primary Metal Manufacturing331523 | — | ● ACTIVE |
St Paul Brass Foundry CO | Saint Paul | MN | Primary Metal Manufacturing331522 | — | ● ACTIVE |
Strohecker INC | East Palestine | OH | Primary Metal Manufacturing331410 | 20-99 | ● ACTIVE |
| SBStupp Bridge Company | Bowling Green | KY | Primary Metal Manufacturing331110 | 100-499 | ● ACTIVE |
| SBStupp Bros., INC. | Saint Louis | MO | Primary Metal Manufacturing331210 | 20-99 | ● ACTIVE |
| SMSulzer Metco (us) Troy | Troy | MI | Primary Metal Manufacturing331492 | 20-99 | ● ACTIVE |
| SWSumiden Wire Products CORP | Dickson | TN | Primary Metal Manufacturing331222 | 20-99 | ● ACTIVE |
Supercon, Incorporated | Shrewsbury | MA | Primary Metal Manufacturing331222 | 20-99 | ● ACTIVE |
| SBSuperior Brass & Aluminum Casting CO | East Lansing | MI | Primary Metal Manufacturing331491 | 20-99 | ● ACTIVE |
Superior Extrusion, INC | Gwinn | MI | Primary Metal Manufacturing331315 | 100-499 | ● ACTIVE |
Superior Forge & Steel CORP | Lima | OH | Primary Metal Manufacturing331110 | — | ● ACTIVE |
Superior Tube Company, INC. | Collegeville | PA | Primary Metal Manufacturing331210 | 100-499 | ● ACTIVE |
Tampa Brass and Aluminum Corporation. | Tampa | FL | Primary Metal Manufacturing331111 | — | ● ACTIVE |
| TSTaubensee Steel and Wire CO | Wheeling | IL | Primary Metal Manufacturing331222 | 100-499 | ● ACTIVE |
Taurus Fabrication, INC | Grass Valley | CA | Primary Metal Manufacturing331110 | — | ● ACTIVE |
Taylor Forge Engineered Systems, INC. | Paola | KS | Primary Metal Manufacturing331210 | 100-499 | ● ACTIVE |
Team Industries Bagley | Bagley | MN | Primary Metal Manufacturing331521 | 100-499 | ● ACTIVE |
| TLTechni-cast LLC | South Gate | CA | Primary Metal Manufacturing331529 | 20-99 | ● ACTIVE |
| TTTech Tube, INC. | King of Prussia | PA | Primary Metal Manufacturing331210 | 100-499 | ● ACTIVE |
Tecomet INC. | Wilmington | MA | Primary Metal Manufacturing331110 | 100-499 | ● ACTIVE |
Telcon LLC | Streetsboro | OH | Primary Metal Manufacturing331529 | 20-99 | ● ACTIVE |
| TLTemperform LLC | Novi | MI | Primary Metal Manufacturing331513 | 20-99 | ● ACTIVE |
| TATennessee Aluminum Processors INC | Gadsden | AL | Primary Metal Manufacturing331314 | 20-99 | ● ACTIVE |
| TATennessee Aluminum Processors INC | Mount Pleasant | TN | Primary Metal Manufacturing331314 | 20-99 | ● ACTIVE |
The Carondelet Foundry Corporation | Pevely | MO | Primary Metal Manufacturing331513 | — | ● ACTIVE |
| TEThe Electric Materials Co/north East | North East | PA | Primary Metal Manufacturing331420 | 100-499 | ● ACTIVE |
The Harrison Steel Castings CO | Attica | IN | Primary Metal Manufacturing331511 | 100-499 | ● ACTIVE |
The Indium Corporation of America | Rome | NY | Chemical Manufacturing325188 | — | ● ACTIVE |
The Quality Castings Company | Orrville | OH | Primary Metal Manufacturing331511 | 100-499 | ● ACTIVE |
| TIThermalex, INC | Montgomery | AL | Primary Metal Manufacturing331316 | 100-499 | ● ACTIVE |
Ti Squared Technologies, INC. | Albany | OR | Primary Metal Manufacturing331529 | 20-99 | ● ACTIVE |
Titan International, INC. | Pottstown | PA | Primary Metal Manufacturing331110 | 20-99 | ● ACTIVE |
Titan Wheel Corporation of Illinois | Quincy | IL | Primary Metal Manufacturing331221 | 500+ | ● ACTIVE |
| TMToyota Motor Mfg Missouri INC | Troy | MO | Primary Metal Manufacturing331316 | 500+ | ● ACTIVE |
Tpm Acquisition Holdings LLC | Sugar Land | TX | Primary Metal Manufacturing331512 | 20-99 | ● ACTIVE |
| TDTrace Die Cast INC | Bowling Green | KY | Primary Metal Manufacturing331521 | 100-499 | ● ACTIVE |
Tricab INC | Worcester | MA | Primary Metal Manufacturing331420 | 20-99 | ● ACTIVE |
Trimet Industries INC | Traverse City | MI | Primary Metal Manufacturing331318 | 1-19 | ● ACTIVE |
| TTTrue Temper Sports, INC. | Amory | MS | Primary Metal Manufacturing331210 | 100-499 | ● ACTIVE |
| TITst INC | Fontana | CA | Primary Metal Manufacturing331313 | 100-499 | ● ACTIVE |
| TUTyler Union | Anniston | AL | Primary Metal Manufacturing331511 | 100-499 | ● ACTIVE |