| TCTimkensteel CORP - Faircrest Steel Plant | Canton | OH | — | ◇ UNVERIFIED |
| TCTimkensteel CORP - Harrison Steel Plant | Canton | OH | — | ◇ UNVERIFIED |
| TCTimkensteel Corporation | Canton | OH | — | ◇ UNVERIFIED |
| TPTindall Precast Concrete | Moss Point | MS | — | ◇ UNVERIFIED |
| THTison & Hall Concrete Prod INC | Harrisburg | IL | — | ◇ UNVERIFIED |
| TBTitan Block | Frederiksted | VI | — | ◇ UNVERIFIED |
| TFTitan Florida-canal Street | Fort Myers | FL | — | ◇ UNVERIFIED |
| TWTi Wire | Rancho Cucamonga | CA | — | ◇ UNVERIFIED |
| TITmk Ipsco | Brookfield | OH | — | ◇ UNVERIFIED |
| TWTodd's Welding INC. | Fruita | CO | — | ◇ UNVERIFIED |
| TBTompkinsville Block CO | Tompkinsville | KY | — | ◇ UNVERIFIED |
| TBTop Block, LLC | Norfolk | NE | — | ◇ UNVERIFIED |
| TITranschem INC | Carlsbad | CA | — | ◇ UNVERIFIED |
| TMTransit Mix Concrete & Materials Company | Caruthersville | MO | — | ◇ UNVERIFIED |
| TFTrans-tex Fabricating CO. INC. | San Antonio | TX | — | ◇ UNVERIFIED |
| TGTremron Group - Medley | Medley | FL | — | ◇ UNVERIFIED |
| TLTremron LLC | Jacksonville | FL | — | ◇ UNVERIFIED |
| TITrenwa INC | Lakeland | FL | — | ◇ UNVERIFIED |
| TITrenwyth Industries | South Beloit | IL | — | ◇ UNVERIFIED |
| TITrenwyth Industries | South Beloit | IL | — | ◇ UNVERIFIED |
| TITrenwyth Industries - Trendstone Plant | Emigsville | PA | — | ◇ UNVERIFIED |
| TCTri Circle Pavers INC | Fort Myers | FL | — | ◇ UNVERIFIED |
| TDTri Delta a Division of Superlite | North Las Vegas | NV | — | ◇ UNVERIFIED |
| TLTri-krete Limited | Poughkeepsie | NY | — | ◇ 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 |
| TWT W Sherman Heirs 15 #3 Facility | Haynesville | LA | — | ◇ UNVERIFIED |
| UUUltra USA INC | Los Angeles | CA | — | ◇ UNVERIFIED |
| UCUnion Concrete Products | Maxwelton | WV | — | ◇ UNVERIFIED |
| UAUnited Alloys INC | Los Angeles | CA | — | ◇ UNVERIFIED |
| UBUnited Block CO. | Chicora | PA | — | ◇ 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 |
| UUnknown | Miami | FL | — | ◇ UNVERIFIED |
| UWUSA Waste (monroeville Landfill) | Monroeville | PA | — | ◇ UNVERIFIED |
| UDU.s. Dol-osha Corpus Christi Area Office | Mcallen | TX | — | ◇ UNVERIFIED |
| UOUsdol Osha- Hasbrouck Heights | Lyndhurst | NJ | — | ◇ 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 |
| USUS Steel East Chicago | East Chicago | IN | — | ◇ UNVERIFIED |
| USUS Steel - Gary Works | Chicago | IL | — | ◇ UNVERIFIED |
| USUtilities Structures | Fort Myers | FL | — | ◇ UNVERIFIED |
| VBValley Block Loveland Facility | Loveland | CO | — | ◇ UNVERIFIED |
| VDValley Die Castings, INC. | Mcallen | TX | — | ◇ UNVERIFIED |
| VSVan Smith Block Plant | Summerville | SC | — | ◇ UNVERIFIED |
| VCViking Consolidated Services, Inc. | Niagara Falls | NY | — | ◇ UNVERIFIED |
| VLViktor's Legacy Custom Gunsmithing | Fairport | OH | — | ◇ UNVERIFIED |
| VSVinton Steel, LLC | Vinton | TX | — | ◇ UNVERIFIED |
| VTVoestalpine Texas LLC | Portland | TX | — | ◇ UNVERIFIED |
| VCVoss Clark D/b/a Pgp CORP | Jeffersonville | IN | — | ◇ UNVERIFIED |
| VIVoss Industries-voss Taylor Div | Taylor | MI | — | ◇ UNVERIFIED |
| VCVotorantim Cimentos North America, INC. | Spring Hill | FL | — | ◇ UNVERIFIED |
| VVVSP Ventures Inc. | Jackson | MI | — | ◇ UNVERIFIED |
| VMVulcan Materials:columbia Quarry | Columbia | SC | — | ◇ UNVERIFIED |
| VMVulcan Materials Company, Florida Rock Division | Kissimmee | FL | — | ◇ UNVERIFIED |
| VMVulcan Materials Company, Florida Rock Division | Bartow | FL | — | ◇ UNVERIFIED |
| WMWa317935881 - Mutual Materials Company | Kent | WA | — | ◇ UNVERIFIED |
| WMWa317937176 - Mutual Materials Company | Mica | WA | — | ◇ UNVERIFIED |
| WUWa317941422 - Ultrablock INC | Vancouver | WA | — | ◇ UNVERIFIED |
| WPWa317942930 - Precast By Design INC | Elk | WA | — | ◇ UNVERIFIED |
| WSWarren Steel Holdings LLC | Warren | OH | — | ◇ UNVERIFIED |
| WSWarren Steel Holdings, LLC (0278080015) | Warren | OH | — | ◇ UNVERIFIED |
| WCWatkins Concrete Block CO | Omaha | NE | — | ◇ UNVERIFIED |
| WFWelding Flux Facility | Niagara Falls | NY | — | ◇ UNVERIFIED |
| WSWestern States Wholesale INC Dba Patio Industries | Ontario | CA | — | ◇ UNVERIFIED |
| WCWheeler Consolidated, INC. | Pinellas Park | FL | — | ◇ UNVERIFIED |
| WFWheel Fix It Miami CORP. | Hialeah | FL | — | ◇ UNVERIFIED |
| WWhemco/midland | Midland | PA | — | ◇ UNVERIFIED |
| WLWhisler Land Company | Sacramento | CA | — | ◇ UNVERIFIED |
| WCWhite Cap Ready Mix INC | Portola | CA | — | ◇ UNVERIFIED |
| WCWhite Cement Specialties | Venice | FL | — | ◇ UNVERIFIED |
| WRWhite Research & Development INC | Irmo | SC | — | ◇ UNVERIFIED |
| WGWillamette Graystone | Wood Village | OR | — | ◇ UNVERIFIED |
| WGWillamette Graystone LLC | Albany | OR | — | ◇ UNVERIFIED |
| WGWillamette Graystone - Springfield, Or Tank | Springfield | OR | — | ◇ UNVERIFIED |
| WBWillcutt Block and Supply Company of Tuscaloosa, INC. | Tuscaloosa | AL | — | ◇ UNVERIFIED |
| WBWillocks Brothers CO INC. | Maryville | TN | — | ◇ UNVERIFIED |
| WMWillscot Mobile Mini | Rialto | CA | — | ◇ UNVERIFIED |
| WSWilson Structural Steel, LLC | Fenton | MO | — | ◇ UNVERIFIED |
| WMWings Manufacturing Inc. | Mount Clemens | MI | — | ◇ UNVERIFIED |
| WBWiregrass Block & Precast | Newton | AL | — | ◇ UNVERIFIED |
| WIWoodside Investment INC Dba Michael & CO | Lockeford | CA | — | ◇ UNVERIFIED |
| WBWright Block & Precast - Ruby | Madisonville | KY | — | ◇ UNVERIFIED |
| WAWv Alloys Formerly Chipper | Alloy | WV | — | ◇ UNVERIFIED |
| YCYagerbomb Customs LLC | Homerville | OH | — | ◇ UNVERIFIED |
| YLYardBlox LLC | Springville | UT | — | ◇ UNVERIFIED |
| YBYavapai Block and Precast, Co., INC. | Prescott | AZ | — | ◇ UNVERIFIED |
| YBYork Building Products - Cockeysville | Cockeysville | MD | — | ◇ UNVERIFIED |
| ZPZenith Products CO | Maple Grove | MN | — | ◇ UNVERIFIED |
| ZIZimkor Industries Incorporated | Littleton | CO | — | ◇ UNVERIFIED |
| ZCZygrove Corporation | Mound | MN | — | ◇ UNVERIFIED |
