| AIAmega Industries | Longview | TX | — | ◇ UNVERIFIED |
| AHAmerican Highway Products, LTD | Bolivar | OH | — | ◇ UNVERIFIED |
| ASAmerican Spiral Weld Pipe | Flint | MI | — | ◇ UNVERIFIED |
| ASAmerican Stainless Tubing, INC. | Troutman | NC | — | ◇ UNVERIFIED |
| ASAmerican Stair CORP | Romeoville | IL | — | ◇ UNVERIFIED |
| ASAmerican Steel Fab | Pevely | MO | — | ◇ UNVERIFIED |
| AUAngstrom USA LLC | Taylor | MI | — | ◇ UNVERIFIED |
 Api Heat Transfer INC. | Montgomery | AL | — | ◇ UNVERIFIED |
| AUArmor Up, LLC | Tulsa | OK | — | ◇ UNVERIFIED |
| ABAti Billerica Operations | Billerica | MA | — | ◇ UNVERIFIED |
| AFAti Flowform Products, LLC | Billerica | MA | — | ◇ UNVERIFIED |
| AIAuburn Industries A&A Inc | Auburn Hills | MI | — | ◇ UNVERIFIED |
| APAul Pipe Tube & Steel INC | Vernon | CA | — | ◇ UNVERIFIED |
| APAxis Pipe and Tube Bryan Facility | Bryan | TX | — | ◇ UNVERIFIED |
| BMBarbay Machine Works | Beaumont | TX | — | ◇ UNVERIFIED |
| BPBarr Properties, LLC | Madison | IN | — | ◇ UNVERIFIED |
| BBB & B Pipe & Tool Company | Long Beach | CA | — | ◇ UNVERIFIED |
| BFBeaver Falls Tubular Prodllc/beaver Falls Plt | Beaver Falls | PA | — | ◇ UNVERIFIED |
| BMBehrens Manufacturing LLC | Winona | MN | — | ◇ UNVERIFIED |
| BMBenzie Manufacturing LLC | Frankfort | MI | — | ◇ UNVERIFIED |
| BSBerg Spiral Pipe Corporation | Mobile | AL | — | ◇ UNVERIFIED |
| BEBerry Enterprise of Ms, INC | Perkinston | MS | — | ◇ UNVERIFIED |
| BABest American Welding & Steel | Westbury | NY | — | ◇ UNVERIFIED |
| BDBlack Diamond Welding INC | Roosevelt | UT | — | ◇ UNVERIFIED |
| BFBlue Fabrication INC | Delta | CO | — | ◇ UNVERIFIED |
| BPBlue Patriot Fab | Omaha | NE | — | ◇ UNVERIFIED |
| BTBoomerang Tube LLC | Chesterfield | MO | — | ◇ UNVERIFIED |
| BSBostic Steel, INC. | Miami | FL | — | ◇ UNVERIFIED |
| BFBranson Family Holdings LLC | Rapid City | SD | — | ◇ UNVERIFIED |
| BFBrendle Fire Equipment, INC. | Montgomery | AL | — | ◇ UNVERIFIED |
| BCBrittany Catania | San Bernardino | CA | — | ◇ UNVERIFIED |
| BEBromley Excavating | Centralia | IL | — | ◇ UNVERIFIED |
| BIBronson Investments, Inc. | White City | OR | — | ◇ UNVERIFIED |
| BIBronson Investments, Inc. | White City | OR | — | ◇ UNVERIFIED |
| BHBrown Hawk LLC | Medina | MN | — | ◇ UNVERIFIED |
| BLBruggrovanco LLC | Joliet | IL | — | ◇ UNVERIFIED |
| BSB & S Iron Works LLC | Bronx | NY | — | ◇ UNVERIFIED |
| BMBull Moose Tube CO | Chicago Heights | IL | — | ◇ UNVERIFIED |
| BMBull Moose Tube Company Expansion | Elkhart | IN | — | ◇ UNVERIFIED |
| CPCalifornia Pipe Fabricators | Dixon | CA | — | ◇ UNVERIFIED |
| CPCalifornia Pipe Recycling, INC. | Bakersfield | CA | — | ◇ UNVERIFIED |
| CCCapital City Culvert Corporation | Brooklyn | WI | — | ◇ UNVERIFIED |
| CECarlysle Engineering INC | Jamaica Plain | MA | — | ◇ UNVERIFIED |
| CSCentral Steel & Wire CO | Chicago | IL | — | ◇ UNVERIFIED |
| CPCentric Pipe LLC | Bossier City | LA | — | ◇ UNVERIFIED |
| CTCentury Tube LLC | Madison | IN | — | ◇ UNVERIFIED |
| CQChelan Quality Welding, LLC | Cashmere | WA | — | ◇ UNVERIFIED |
| CIChrist Iron Works, INC. | Kenosha | WI | — | ◇ UNVERIFIED |
| COCity of Ontario | Ontario | CA | — | ◇ UNVERIFIED |
| CCCives Corporation | Idaho Falls | ID | — | ◇ UNVERIFIED |
