| APAmerican Pipe Bending INC. | Tulsa | OK | — | ◇ UNVERIFIED |
| APAmerican Precision Castings INC | Chicago | IL | — | ◇ UNVERIFIED |
| ARAmerican Rail Car | Saint Charles | MO | — | ◇ UNVERIFIED |
| AMAnson Mechanical Piping, INC. | Charlotte | NC | — | ◇ UNVERIFIED |
| ABApex Blasting | Baytown | TX | — | ◇ UNVERIFIED |
| APApex Piping Systems, INC. | Wilmington | DE | — | ◇ UNVERIFIED |
| AIApn INC | Caledonia | MN | — | ◇ UNVERIFIED |
| AMApollo Masters Corporation | Banning | CA | — | ◇ UNVERIFIED |
| AFAptim Facilities INC | Prairieville | LA | — | ◇ UNVERIFIED |
| AKAquatic Kreations | Hobe Sound | FL | — | ◇ UNVERIFIED |
| AAArapahoe Aluminum Foundry | Englewood | CO | — | ◇ UNVERIFIED |
| ALArc Limited | Leetsdale | PA | — | ◇ UNVERIFIED |
| AFArk Fabricators, INC. | Augusta | GA | — | ◇ UNVERIFIED |
| AMArk-valley Metal Processing INC | Pueblo | CO | — | ◇ UNVERIFIED |
| ABArrowhead Brass Products | Los Angeles | CA | — | ◇ UNVERIFIED |
| AIArrowhead Industries INC | Afton | MI | — | ◇ UNVERIFIED |
| ACArt Casting of Montana, INC. | Belgrade | MT | — | ◇ UNVERIFIED |
| AFArtworks Foundry LLC | Berkeley | CA | — | ◇ UNVERIFIED |
| AFAsap Fabrication INC. | Plant City | FL | — | ◇ UNVERIFIED |
| AFAsc-es: Federalsburg | Federalsburg | MD | — | ◇ UNVERIFIED |
| ARAssociated Rubber & Mechanical INC | Magna | UT | — | ◇ UNVERIFIED |
| AFAtherton Foundry Products INC | Riverdale | IL | — | ◇ UNVERIFIED |
| AIAtkore International | Harvey | IL | — | ◇ UNVERIFIED |
| AFAtlantic Fabrication and Design, LLC | Oklahoma City | OK | — | ◇ UNVERIFIED |
| AIAvantech INC | Brainerd | MN | — | ◇ UNVERIFIED |
| BCBaker Coupling CO INC | Vernon | CA | — | ◇ UNVERIFIED |
| BBBall Brass & Aluminum Foundry | Auburn | IN | — | ◇ UNVERIFIED |
| BCBarr Castings | Portland | OR | — | ◇ UNVERIFIED |
| BMBarrington Manufacturing | El Dorado Springs | MO | — | ◇ UNVERIFIED |
| BFBatt Fabricators, INC | Greensboro | NC | — | ◇ UNVERIFIED |
| BBB & B Metals | Cambridge | IL | — | ◇ UNVERIFIED |
| BIBendtec INC | Duluth | MN | — | ◇ UNVERIFIED |
| BTBent Tube INC | Fowlerville | MI | — | ◇ UNVERIFIED |
| BCBermag Corporation INC | Hickman | KY | — | ◇ UNVERIFIED |
| BBBerntsen Brass & Aluminum Foundry, INC. | Phelps | WI | — | ◇ UNVERIFIED |
| BMBetra Manufacturing | Carson City | NV | — | ◇ UNVERIFIED |
| BMBetra Manufacturing Co., INC. | Dayton | NV | — | ◇ UNVERIFIED |
| BFB F Shaw INC | Laurens | SC | — | ◇ UNVERIFIED |
| BPBhm Pipe & Supply, INC | Crosby | TX | — | ◇ UNVERIFIED |
| BIB.j.r.e.o. INC. | West Elizabeth | PA | — | ◇ UNVERIFIED |
| BCBlue Castings | Arlington | WA | — | ◇ UNVERIFIED |
| BRBlue Ridge Machine & Electrical Contractors INC | Westminster | SC | — | ◇ UNVERIFIED |
| BTBoomerang Tube, LLC | Liberty | TX | — | ◇ UNVERIFIED |
| BMBorusan Mannesmann Pipe USA | Baytown | TX | — | ◇ UNVERIFIED |
| BRBoston Retail Products | Medford | MA | — | ◇ UNVERIFIED |
| BFBridesburg Fndy CO | Whitehall | PA | — | ◇ UNVERIFIED |
| BMBr Metal Products INC | Livingston | TN | — | ◇ UNVERIFIED |
| BHBrost Holdings LLC | Cleveland | OH | — | ◇ UNVERIFIED |
| BCBroward Casting Foundry, INC. | Fort Lauderdale | FL | — | ◇ UNVERIFIED |
| BFBrumund Foundry INC | Chicago | IL | — | ◇ UNVERIFIED |
| BEBrunton Enterprises | Universal City | CA | — | ◇ UNVERIFIED |
| BWBrush Wellman Engineered Materials | Lorain | OH | — | ◇ UNVERIFIED |
| BPBta Plant #3 | Wellford | SC | — | ◇ UNVERIFIED |
| BBBuilders Brass Wks CORP (eis U | Los Angeles | CA | — | ◇ UNVERIFIED |
| CCCadillac Culvert INC | Cadillac | MI | — | ◇ UNVERIFIED |
| CSCalifornia Steel Industries INC | Fontana | CA | — | ◇ UNVERIFIED |
 Cal Sierra Pipe LLC | Stockton | CA | — | ◇ UNVERIFIED |
| CDCameron Dynatorque | Muskegon | MI | — | ◇ UNVERIFIED |
| CMCapitol Manufacturing Lansing Facility | Lansing | OH | — | ◇ UNVERIFIED |
| CFCarbery Fabrication Company, INC. | Odessa | TX | — | ◇ UNVERIFIED |
 Carley Foundry INC - Pattern Shop | Blaine | MN | — | ◇ UNVERIFIED |
| CCCarter Casting CO INC | South Gate | CA | — | ◇ UNVERIFIED |
| CCastco | San Leandro | CA | — | ◇ UNVERIFIED |
| CACastek Aluminum, INC. | Elyria | OH | — | ◇ UNVERIFIED |
| CMCast Machined Products, INC. | Denver | CO | — | ◇ UNVERIFIED |
| CPCast Products Dba Consolidated Precision Products | Pomona | CA | — | ◇ UNVERIFIED |
| CRCast Rite Metal Company, INC. | Birdsboro | PA | — | ◇ UNVERIFIED |
 Cast Technologies INC. | Peoria | IL | — | ◇ UNVERIFIED |
| CPCaterpillar Precision Seals | Toccoa | GA | — | ◇ UNVERIFIED |
| CICb & I | Clearfield | UT | — | ◇ UNVERIFIED |
| CECb&i El Dorado | El Dorado | AR | — | ◇ UNVERIFIED |
| CBC & B Piping,inc. Adamsville | Adamsville | AL | — | ◇ UNVERIFIED |
| CBC & B Piping (w), INC. | Leeds | AL | — | ◇ UNVERIFIED |
| CPCemco Products Site | Everett | WA | — | ◇ UNVERIFIED |
| CACentury Aluminum of Kentucky General Partnership | Hawesville | KY | — | ◇ UNVERIFIED |
| CCCentury Castings Corporation | Swansea | IL | — | ◇ UNVERIFIED |
| CFCentury Foundry Inc-2524 Park | Muskegon Heights | MI | — | ◇ UNVERIFIED |
| CWCharps Welding & Fabricating INC | Clearbrook | MN | — | ◇ UNVERIFIED |
| CFCharter Foundry CO INC | Huntington Park | CA | — | ◇ UNVERIFIED |
| CIChart INC | Fremont | CA | — | ◇ UNVERIFIED |
| CMChassix Montague Operations | Montague | MI | — | ◇ UNVERIFIED |
| CPChattanooga Pattern and Foundry, INC. | Chattanooga | TN | — | ◇ UNVERIFIED |
| CAChicago Aluminum Castings CO INC | Chicago | IL | — | ◇ UNVERIFIED |
| CHChicago Heights Brass Foundry, INC. | Chicago Heights | IL | — | ◇ UNVERIFIED |
 Chicago Magnesium Casting CO | Blue Island | IL | — | ◇ UNVERIFIED |
| CTChicago Tube and Iron Company | Locust | NC | — | ◇ UNVERIFIED |
| CFCianbro Fab & Coating CORP (bangor) | Bangor | ME | — | ◇ UNVERIFIED |
| CCinao | Franklin | OH | — | ◇ UNVERIFIED |
| CCCitation CORP | Butler | IN | — | ◇ UNVERIFIED |
| CSCK Supply, LLC | Jal | NM | — | ◇ UNVERIFIED |
| CAClarke's Allied INC. | Shreveport | LA | — | ◇ UNVERIFIED |
| CWClear Water Manufacturing | Madison Heights | VA | — | ◇ UNVERIFIED |
| CSClock Spring / Nri | Centennial | CO | — | ◇ UNVERIFIED |
| CPCoatings Plus, INC | Fenton | MO | — | ◇ UNVERIFIED |
| CSCobin Salvage Yard INC | Dowell | IL | — | ◇ UNVERIFIED |
| CPCoflexip Products Division | Houston | TX | — | ◇ UNVERIFIED |
| CPColumbia Place Associates, LLC | Syracuse | NY | — | ◇ UNVERIFIED |
| CACommercial and Industrial Piping | Quinby | SC | — | ◇ UNVERIFIED |
| CPCommercial Piping & Fabricators, INC | Tar Heel | NC | — | ◇ UNVERIFIED |
| CTCommercial Titanium Castings | Albany | OR | — | ◇ UNVERIFIED |
