| WOWashington Ornamental Iron Works | Gardena | CA | — | ◇ UNVERIFIED |
| WOWashington Ornamental Iron Works INC. | Los Angeles | CA | — | ◇ UNVERIFIED |
| WMWaste Management of Ohio | Cleveland | OH | — | ◇ UNVERIFIED |
| WMWaste Management of Woburn | Woburn | MA | — | ◇ UNVERIFIED |
| WSWaterfront Specialties INC | Victoria | MN | — | ◇ UNVERIFIED |
| WWWater Works Mfg INC Dba Cambridge Metals & Plastic | Cambridge | MN | — | ◇ UNVERIFIED |
| WMWatkins Metal Fabrication | Mineral Wells | TX | — | ◇ UNVERIFIED |
| WBWatson Bowman Acme CORP | Buffalo | NY | — | ◇ UNVERIFIED |
| WWave | Aberdeen | MD | — | ◇ UNVERIFIED |
| WWWave - Worthington Armstrong Venture | Belcamp | MD | — | ◇ UNVERIFIED |
| WAWaynesboro Alloy Works, INC. | Waynesboro | VA | — | ◇ UNVERIFIED |
| WIWayne's Industrial Maintenance | Douglasville | GA | — | ◇ UNVERIFIED |
| WIWayward Industries LLC | Lewiston | ME | — | ◇ UNVERIFIED |
| WCW C Brown Weldingna INC. | Fontana | CA | — | ◇ UNVERIFIED |
| WAWD3 Associates Inc. | South Holland | IL | — | ◇ UNVERIFIED |
 Weber Specialties Plant Two | Schoolcraft | MI | — | ◇ UNVERIFIED |
| WWWebster's Welding & Fab, LLC | Pell City | AL | — | ◇ UNVERIFIED |
| WSWeibee Steel, INC | Newcastle | OK | — | ◇ UNVERIFIED |
| WCWeidong Construction INC | New York | NY | — | ◇ UNVERIFIED |
| WWWeir Welding Company, INC. | Bethlehem | PA | — | ◇ UNVERIFIED |
| WMWeisgram Metal Fab-weisgram M | West Fargo | ND | — | ◇ UNVERIFIED |
| WCWelage Corporation | Cincinnati | OH | — | ◇ UNVERIFIED |
| WCWelding Craftsmen | South Easton | MA | — | ◇ UNVERIFIED |
| WSWelding Solutions, LLC Dba Welding Unlimited | Asheville | NC | — | ◇ UNVERIFIED |
| WSWeldon Steel - Kennametal Drive | Weldon | NC | — | ◇ UNVERIFIED |
| WIWeldway INC | Oakdale | CA | — | ◇ UNVERIFIED |
| WSWells/mccoy Steel Services, INC. | Anna | TX | — | ◇ UNVERIFIED |
| WMWe-mac Manufacturing CO | Atchison | KS | — | ◇ UNVERIFIED |
| WIWesanco INC | La Mirada | CA | — | ◇ UNVERIFIED |
| WLWes LLC | Saint Paul | MN | — | ◇ UNVERIFIED |
| WLWes LLC Dba Ultralox | Eagan | MN | — | ◇ UNVERIFIED |
| WIWesselhoeft, INC. | Moundville | AL | — | ◇ UNVERIFIED |
| WWWestbay Welding & Fabrication, INC. | Warwick | RI | — | ◇ UNVERIFIED |
| WCWest Coast Ironworks Inc | Federal Way | WA | — | ◇ UNVERIFIED |
| WCWest Coast Metalcrafts, INC. | Long Beach | CA | — | ◇ UNVERIFIED |
| WCWest Coast Metal Finishing | Los Angeles | CA | — | ◇ UNVERIFIED |
| WIWestco Iron Works | Livermore | CA | — | ◇ UNVERIFIED |
| WEWest Edge Design | San Francisco | CA | — | ◇ UNVERIFIED |
| WAWestern Architectural Iron CO | Chicago | IL | — | ◇ UNVERIFIED |
| WFWestern Fabrication & Equipment | Bakersfield | CA | — | ◇ UNVERIFIED |
| WFWestern Fabrication, LLC | Las Cruces | NM | — | ◇ UNVERIFIED |
| WFWestern Fabricators | Hesperia | CA | — | ◇ UNVERIFIED |
| WGWestern Group | Portersville | PA | — | ◇ UNVERIFIED |
| WIWestern Iron Enterprises | Las Vegas | NV | — | ◇ UNVERIFIED |
| WIWestern Ironmakers INC. | Orem | UT | — | ◇ UNVERIFIED |
| WMWestern Maine Steel Inc | West Paris | ME | — | ◇ UNVERIFIED |
| WMWestern Mouldings | Upland | CA | — | ◇ UNVERIFIED |
| WNWestern New York Manufacturing | Buffalo | NY | — | ◇ UNVERIFIED |
| WPWestern Pacific Storage Systems, INC. | San Dimas | CA | — | ◇ UNVERIFIED |
| WPWestern Precision Manufacturing LLC | Grand Junction | CO | — | ◇ UNVERIFIED |
