| UEUnion Elec Steel Carnegie Plt | Carnegie | PA | — | ◇ UNVERIFIED |
| UTUnion Tube Mill LLC | Union City | IN | — | ◇ UNVERIFIED |
| UIUnited Industries | Selmer | TN | — | ◇ UNVERIFIED |
| UPUnited Pipe & Steel | Stockton | CA | — | ◇ UNVERIFIED |
| USUnited Spiral Pipe LLC Manufacturing Plan | Pittsburg | CA | — | ◇ UNVERIFIED |
| USUnited Stars INC | Beloit | WI | — | ◇ UNVERIFIED |
| UTUnity Tube, Inc. | East Palestine | OH | — | ◇ UNVERIFIED |
| UFUniversal Fabrication, LLC | Kenner | LA | — | ◇ UNVERIFIED |
| UTUniversal Tube | Rochester Hills | MI | — | ◇ UNVERIFIED |
| UOUsdol Osha-atlanta East | Gainesville | GA | — | ◇ UNVERIFIED |
| UIU.s. Industrial Piping, INC. | Kernersville | NC | — | ◇ UNVERIFIED |
| USUS Steel - Lorain Tubular Operations | Lorain | OH | — | ◇ UNVERIFIED |
| USU.s. Steel Tubular Products | Houston | TX | — | ◇ UNVERIFIED |
| UIUsui International INC | Sharonville | OH | — | ◇ UNVERIFIED |
| VIVacuum Instrument CORP | Ronkonkoma | NY | — | ◇ UNVERIFIED |
| VVallourec | Youngstown | OH | — | ◇ UNVERIFIED |
| VAValue Added Processing Inc | East Pittsburgh | PA | — | ◇ UNVERIFIED |
| VFVans Fabricating INC. | De Pere | WI | — | ◇ UNVERIFIED |
| VCVell Company, INC. | Palisades | NY | — | ◇ UNVERIFIED |
| VSVescom Systems, LLC | Bronxville | NY | — | ◇ UNVERIFIED |
| VSVescom Systems, LLC | Kearny | NJ | — | ◇ UNVERIFIED |
| WBWa317942603 - Bending Solutions Incorporated | Marysville | WA | — | ◇ UNVERIFIED |
| WWWalter Wire Edm Service* | Downers Grove | IL | — | ◇ UNVERIFIED |
| WFWarfield Fabrication LLC | Yoakum | TX | — | ◇ UNVERIFIED |
 Webco Industries, INC. Keystone | Sand Springs | OK | — | ◇ UNVERIFIED |
| WIWebco Industries Texas Distribution Div | Orange | TX | — | ◇ UNVERIFIED |
| WEW E Hall CO | Eugene | OR | — | ◇ UNVERIFIED |
| WEW. E. Hall Company | Casa Grande | AZ | — | ◇ UNVERIFIED |
| WTWelded Tubes, INC. | San Antonio | TX | — | ◇ UNVERIFIED |
| W6West 62nd Ave Holdings LLC | Denver | CO | — | ◇ UNVERIFIED |
| WTWestern Tube & Conduit CORP | Long Beach | CA | — | ◇ UNVERIFIED |
| WIWestfalia, INC | Bristol | CT | — | ◇ UNVERIFIED |
| WFWG Fabricators LLC | Vero Beach | FL | — | ◇ UNVERIFIED |
| WTWheatland Tube CO | Wheatland | PA | — | ◇ UNVERIFIED |
| WTWheatland Tube Co/clark St Plt | Sharon | PA | — | ◇ UNVERIFIED |
| WTWheatland Tube Council Ave Plt/wheatland Tube LLC | Wheatland | PA | — | ◇ UNVERIFIED |
| WTWheatland Tube, LLC. | Blytheville | AR | — | ◇ UNVERIFIED |
| WMWheeler Metals INC | Springfield | MO | — | ◇ UNVERIFIED |
| WMWillcox Metal Fabricators, LLC | San Antonio | TX | — | ◇ UNVERIFIED |
| WGWilliam Grant Tank & Vessell | Henderson | TX | — | ◇ UNVERIFIED |
| WMWisconsin Metal Tech, Inc. | Richfield | WI | — | ◇ UNVERIFIED |
| WMWisconsin Metal Tech, Inc. | Richfield | WI | — | ◇ UNVERIFIED |
 Wisconsin Oven CORP | East Troy | WI | — | ◇ UNVERIFIED |
| WIWord Industries Fabrication, LLC | Tulsa | OK | — | ◇ UNVERIFIED |
| WSWorth Steel Fabrication | Joshua | TX | — | ◇ UNVERIFIED |
| WMWrax Manufacturing | Birmingham | AL | — | ◇ UNVERIFIED |
| YMYakfab Metals Inc | Oconto | WI | — | ◇ UNVERIFIED |
| YSYankee Supply CO. | Johnston | RI | — | ◇ UNVERIFIED |
| ZIZekelman Industries | Farrell | PA | — | ◇ UNVERIFIED |
| ZIZekelman Industries Wheatland Tube CO | Chicago | IL | — | ◇ UNVERIFIED |
