| USUnico Steel, INC. | City of Industry | CA | — | ◇ UNVERIFIED |
| UIUnimast Incorporated | Boonton | NJ | — | ◇ UNVERIFIED |
| UMUnion Metal - Canton | Canton | OH | — | ◇ UNVERIFIED |
| UTUnion Tag Manufacturing | Raiford | FL | — | ◇ UNVERIFIED |
| USUnited Steel Works, INC. | Clearwater | FL | — | ◇ UNVERIFIED |
| UFUniversal Fabricating & Construction Ser | Columbus | OH | — | ◇ UNVERIFIED |
| UUnknown | Topeka | KS | — | ◇ UNVERIFIED |
| UIUpper Iowa University - Peacock Arts & Athletics Center | Fayette | IA | — | ◇ UNVERIFIED |
| UDUrgent Design and Mfg INC | Lapeer | MI | — | ◇ UNVERIFIED |
| ULUscoe Louisville Repair Sta | Louisville | KY | — | ◇ UNVERIFIED |
| UDU.s. Defense National Stockpile Center Point Pleasant Depot | Point Pleasant | WV | — | ◇ UNVERIFIED |
| UMUS Machine INC | Fairmont | WV | — | ◇ UNVERIFIED |
| USUsp Structural Connectors | Montgomery | MN | — | ◇ UNVERIFIED |
| UOUtility Optimization Group LLC | Pascagoula | MS | — | ◇ UNVERIFIED |
| VWValley West Welding CO INC | Waverly | TN | — | ◇ UNVERIFIED |
| VIValmont Industries INC | Tulsa | OK | — | ◇ UNVERIFIED |
| VNValmont Newmark | Hazleton | PA | — | ◇ UNVERIFIED |
| VFValmont-newmark Fab Shop | Tuscaloosa | AL | — | ◇ UNVERIFIED |
| VValmont/texas | Brenham | TX | — | ◇ UNVERIFIED |
| VSVandellen Steel INC | Dutton | MI | — | ◇ UNVERIFIED |
| VFVan Fab INC | Union Hill | IL | — | ◇ UNVERIFIED |
 Van Linda Iron Works INC | Lake Worth | FL | — | ◇ UNVERIFIED |
| VMVaughn Manufacturing Corporation | Salisbury | MA | — | ◇ UNVERIFIED |
| VIVega Iron Works | Santa Fe Springs | CA | — | ◇ UNVERIFIED |
| VWVenture Welding (howe) | Howe | IN | — | ◇ UNVERIFIED |
| VEVernon E Faulconer INC - Ambrose #1 | Ruston | LA | — | ◇ UNVERIFIED |
| VMVi Manufacturing INC | Webster | NY | — | ◇ UNVERIFIED |
| VCVirginia Carolina Steel Incorporated | Norfolk | VA | — | ◇ UNVERIFIED |
| VSVista Steel | Ventura | CA | — | ◇ UNVERIFIED |
| VSVoight & Schweitzer | Muskogee | OK | — | ◇ UNVERIFIED |
| VLVstructural LLC | Fort Worth | TX | — | ◇ UNVERIFIED |
| WWWagnerplate Works West | Paramount | CA | — | ◇ UNVERIFIED |
| WFWalco Fabricating INC | Pottsville | PA | — | ◇ UNVERIFIED |
| WMWalker Metal Works LLC | Abingdon | VA | — | ◇ UNVERIFIED |
| WSWalker Station Equipment Company LLC | Tavares | FL | — | ◇ UNVERIFIED |
| WEWallner Expac INC | Ontario | CA | — | ◇ UNVERIFIED |
| WTWard Tank | Charlotte | NC | — | ◇ UNVERIFIED |
| WFWarren Fabricating & Machining CORP | Hubbard | OH | — | ◇ UNVERIFIED |
| WAWashington Aluminum | Baltimore | MD | — | ◇ UNVERIFIED |
| WIWashington Iron Works | Gardena | CA | — | ◇ UNVERIFIED |
| WMWaste Management of Ohio | Cleveland | OH | — | ◇ UNVERIFIED |
| WLWastequip Lm Industries Greer Plant | Greer | SC | — | ◇ UNVERIFIED |
| WMWastequip Manufacturing | Beeville | TX | — | ◇ UNVERIFIED |
 Wastequip Manufacturing CO LLC | East Saint Louis | IL | — | ◇ UNVERIFIED |
| WMWastequip Manufacturing Company, Dba May Fab | Brookhaven | MS | — | ◇ UNVERIFIED |
| WMWastequip Manufacturing Company LLC Dba Galbreath LLC Plant #2 East | Winamac | IN | — | ◇ UNVERIFIED |
| WBWatson Bowman Acme CORP | Buffalo | NY | — | ◇ UNVERIFIED |
| WCWear Concepts LLC | Liberty | MO | — | ◇ UNVERIFIED |
| WMWebco Mfg. | Olathe | KS | — | ◇ UNVERIFIED |
| WMWendland Manufacturing | San Angelo | TX | — | ◇ UNVERIFIED |
| WCWerner Company Louisville | Louisville | KY | — | ◇ UNVERIFIED |
| WCWest Coast Metalcrafts, INC. | Long Beach | CA | — | ◇ UNVERIFIED |
| WCWest Coast Metal Finishing | Los Angeles | CA | — | ◇ UNVERIFIED |
| WIWesterman, INC. | Skiatook | OK | — | ◇ UNVERIFIED |
| WFWest Facility - South Bearhead Creek Field | Fields | LA | — | ◇ UNVERIFIED |
| WVWest Virginia Steel CORP | Charleston | WV | — | ◇ UNVERIFIED |
| WOWestwood Ornamental Iron INC | Raytown | MO | — | ◇ UNVERIFIED |
| WEWheelabrator Energy Systems | Sturbridge | MA | — | ◇ UNVERIFIED |
| WCWheeling Corrugating CO | Gary | IN | — | ◇ UNVERIFIED |
| WCWhiskey Creek Farms | Lawton | IA | — | ◇ UNVERIFIED |
| WFWhite Fab INC | Birmingham | AL | — | ◇ UNVERIFIED |
| WWWildeck West Dba Ladder Industries | Goodyear | AZ | — | ◇ UNVERIFIED |
| WMWillerding Metal Fabrication INC | O Fallon | MO | — | ◇ UNVERIFIED |
| WBWilliams Bridge Company | Bessemer | AL | — | ◇ UNVERIFIED |
| WMWilliams Machine Works INC | Moss Point | MS | — | ◇ UNVERIFIED |
| WMWilliams Machine Works Inc, Facility Number 2 | Pascagoula | MS | — | ◇ UNVERIFIED |
| WFWilliamstown Fabricators INC | Parkersburg | WV | — | ◇ UNVERIFIED |
| WWWilsonart - Wichita Kansas | Wichita | KS | — | ◇ UNVERIFIED |
| WEWilson Equipment Repair INC | Morgantown | WV | — | ◇ UNVERIFIED |
| WSWindsor Steel , INC | Elkhart | IN | — | ◇ UNVERIFIED |
| WIWirecrafters, INC. | Louisville | KY | — | ◇ UNVERIFIED |
| WFWitherup Fabricating & Erection | Oil City | PA | — | ◇ UNVERIFIED |
| WPWonderland Products, INC. | Jacksonville | FL | — | ◇ UNVERIFIED |
| WMWoodbine Mfg CO | Woodbine | IA | — | ◇ UNVERIFIED |
| WGWood Group USA INC - Longmont Facility | Mead Area | CO | — | ◇ UNVERIFIED |
| WMWorld Marine of Mississippi, Llc, West | Pascagoula | MS | — | ◇ UNVERIFIED |
| WTWorldwide Technologies Expansion | Franklin | KY | — | ◇ UNVERIFIED |
| WAWorthington Armstrong Venture | Benton Harbor | MI | — | ◇ UNVERIFIED |
| WAWorthington Armstrong Venture | N Las Vegas | NV | — | ◇ UNVERIFIED |
| WMWorthington Metal Fabricators, LLC Dba Sharon Stairs (1677011204) | Akron | OH | — | ◇ UNVERIFIED |
 W&w Afco Steel | Lubbock | TX | — | ◇ UNVERIFIED |
| XMXcite Manufacturing LLC Dba Richardson Metals INC | Colorado Springs | CO | — | ◇ UNVERIFIED |
| YMYukon Mfg CO | Litchfield | MI | — | ◇ UNVERIFIED |
| ZMZachry Moss Point Fabrication Facility | Moss Point | MS | — | ◇ UNVERIFIED |
| ZCZuckerman CO INC | Winchester | VA | — | ◇ UNVERIFIED |
| 0L084 Lci | Nampa | ID | 20–99 | ◐ LIKELY ACTIVE |
| 0L085 Lci | Goshen | IN | 100–499 | ◐ LIKELY ACTIVE |
| 1T104658 - Tijuana River Barrier | San Diego | CA | 1–19 | ◐ LIKELY ACTIVE |
| 1S148 - Sayreville, NJ | Sayreville | NJ | 20–99 | ◐ LIKELY ACTIVE |
| 1F149 - Fryeburg, ME | Fryeburg | ME | 20–99 | ◐ LIKELY ACTIVE |
| 2F221 - Fort Myers, FL | Fort Myers | FL | 20–99 | ◐ LIKELY ACTIVE |
| 2T237 - Tampa, FL | Tampa | FL | 20–99 | ◐ LIKELY ACTIVE |
| 2C27 Commercial Rd Kingfield, ME 04947 | Kingfield | ME | 20–99 | ◐ LIKELY ACTIVE |
| 3I310 - IndianpolisOliver, IN (JSI) | Indianapolis | IN | 20–99 | ◐ LIKELY ACTIVE |
| 3W314 - Wyoming, MI (ERSCO) | Wyoming | MI | 1–19 | ◐ LIKELY ACTIVE |
| 3L315 - Lansing, MI (ERSCO) | Lansing | MI | 1–19 | ◐ LIKELY ACTIVE |
| 3C318 - Carlisle, PA (TRI-BORO) | Carlisle | PA | 20–99 | ◐ LIKELY ACTIVE |
| 3G37 Global LLC | Wesley Chapel | FL | — | ◐ LIKELY ACTIVE |
| 3C399 - Columbus, OH (B&R) | Columbus | OH | 1–19 | ◐ LIKELY ACTIVE |
| 3U3 Up Metal Works LLC | Milwaukee | WI | — | ◐ LIKELY ACTIVE |
