| SDSteel Dynamics, INC. | Lake City | FL | — | ◇ UNVERIFIED |
| SDSteel Dynamics, INC. (sdi), Structural | Columbia City | IN | — | ◇ UNVERIFIED |
| SDSteel Dynamics, INC. - Swva, INC. | Huntington | WV | — | ◇ UNVERIFIED |
| SRSteel Resources Unlimited, INC. | Miramar | FL | — | ◇ UNVERIFIED |
| SRSteel Resources Unlimited, INC. | Miami | FL | — | ◇ UNVERIFIED |
| STSteel Technology & Design, INC. | Lakeland | FL | — | ◇ UNVERIFIED |
| SSSterling Steel CO LLC | Sterling | IL | — | ◇ UNVERIFIED |
| SSSterling Steel Fabrications INC | West Palm Beach | FL | — | ◇ UNVERIFIED |
| SPSuncoast Projects, LLC | Groveland | FL | — | ◇ UNVERIFIED |
| SGSuncoke Gpi LLC | Granite City | IL | — | ◇ UNVERIFIED |
| SISymmco Inc/sykesville | Sykesville | PA | — | ◇ UNVERIFIED |
| TTamco | Rancho Cucamonga | CA | — | ◇ UNVERIFIED |
| TCTejas Casing | Houston | TX | — | ◇ UNVERIFIED |
| TATeledyne Adams | Union | NJ | — | ◇ UNVERIFIED |
| TSTexas Steel Tech LLC | Weatherford | TX | — | ◇ UNVERIFIED |
| TWTexas Wheel Repair Express 360 LLC | Dallas | TX | — | ◇ UNVERIFIED |
| T2The 291 Cpw Condominium | New York | NY | — | ◇ UNVERIFIED |
| TCThe Carlstar Group LLC | Ontario | CA | — | ◇ UNVERIFIED |
| THThe Herrick Corporation | San Bernardino | CA | — | ◇ UNVERIFIED |
| TIThe Iron Works LTD. | Des Moines | IA | — | ◇ UNVERIFIED |
| TTThe Timken Company | Canton | OH | — | ◇ UNVERIFIED |
| TTThe Timken Steel Corporation | Canton | OH | — | ◇ UNVERIFIED |
| TTThe Timkensteel Corporation | Canton | OH | — | ◇ UNVERIFIED |
| TWThe Wilmington Iron and Metal Company, Inc. | Wilmington | OH | — | ◇ UNVERIFIED |
| TCTimkensteel CORP - Faircrest Steel Plant | Canton | OH | — | ◇ UNVERIFIED |
| TCTimkensteel CORP - Harrison Steel Plant | Canton | OH | — | ◇ UNVERIFIED |
| TCTimkensteel Corporation | Canton | OH | — | ◇ UNVERIFIED |
| TWTi Wire | Rancho Cucamonga | CA | — | ◇ UNVERIFIED |
| TITmk Ipsco | Brookfield | OH | — | ◇ UNVERIFIED |
| TWTodd's Welding INC. | Fruita | CO | — | ◇ UNVERIFIED |
| TFTrans-tex Fabricating CO. INC. | San Antonio | TX | — | ◇ UNVERIFIED |
| TPTrinity Products, LLC | O Fallon | MO | — | ◇ UNVERIFIED |
 Truenorth Steel | Billings | MT | — | ◇ UNVERIFIED |
| TCTube City Ims LLC | Portage | IN | — | ◇ UNVERIFIED |
| TETvek Enterprises, INC. | Mingo Junction | OH | — | ◇ UNVERIFIED |
| UUUltra USA INC | Los Angeles | CA | — | ◇ UNVERIFIED |
| UAUnited Alloys INC | Los Angeles | CA | — | ◇ UNVERIFIED |
| USUnited States Steel Corporation | Worcester | MA | — | ◇ UNVERIFIED |
| UTUnited Tube Corparation | Medina | OH | — | ◇ UNVERIFIED |
| URUnitrac Railroad Materials INC. | Knoxville | TN | — | ◇ UNVERIFIED |
| UMUniversal Machine Company INC | Paramount | CA | — | ◇ UNVERIFIED |
 Universal Stainless & Alloy Products INC. | North Jackson | OH | — | ◇ UNVERIFIED |
| UWUSA Waste (monroeville Landfill) | Monroeville | PA | — | ◇ UNVERIFIED |
| UDU.s. Dol-osha Corpus Christi Area Office | Mcallen | TX | — | ◇ UNVERIFIED |
| UOUsdol Osha - (mobile) | Calvert | AL | — | ◇ UNVERIFIED |
| USU. S. Pipe | Lynchburg | VA | — | ◇ UNVERIFIED |
| UPUS Pipe Fabrication, LLC | Ocala | FL | — | ◇ UNVERIFIED |
| UCUss Central Teaming Company INC | Gary | IN | — | ◇ UNVERIFIED |
| USUS Steel CORP Joliet Works | Joliet | IL | — | ◇ UNVERIFIED |
| USU.s. Steel Corporation | Fairless Hills | PA | — | ◇ UNVERIFIED |
