| CCCapital City Culvert Corporation | Brooklyn | WI | — | ◇ UNVERIFIED |
| CECapitol Engineering & Manufacturing CO | Harvey | IL | — | ◇ UNVERIFIED |
| CECarlysle Engineering INC | Jamaica Plain | MA | — | ◇ UNVERIFIED |
| CPCarpenter Powder Products INC | Bridgeville | PA | — | ◇ UNVERIFIED |
 Carpenter Technology | Worcester | MA | — | ◇ UNVERIFIED |
| Carpenter Technology Dba Mb Calram LLC | Camarillo | CA | — | ◇ UNVERIFIED |
| Carpenter Technology-tube Div | Union | NJ | — | ◇ UNVERIFIED |
| CMCasara Modern | Huntington Beach | CA | — | ◇ UNVERIFIED |
| CSCascade Steel Rolling Mills, INC. | Mcminnville | OR | — | ◇ UNVERIFIED |
| CECenterline Engineering | Comstock Park | MI | — | ◇ UNVERIFIED |
| CSCentral Steel & Wire CO | Chicago | IL | — | ◇ UNVERIFIED |
| CPCentric Pipe LLC | Bossier City | LA | — | ◇ UNVERIFIED |
| CTCentury Tube LLC | Madison | IN | — | ◇ UNVERIFIED |
| CICeradyne INC 3m Company | Irvine | CA | — | ◇ UNVERIFIED |
| CEC E Steel Group | Spring | TX | — | ◇ UNVERIFIED |
| CMCharter Manufacturing Company, INC. | Cleveland | OH | — | ◇ 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 |
| CMCk Manufacturing, LLC | Lancaster | PA | — | ◇ UNVERIFIED |
| COClarence Ornamental Works & Welding Services, LLC | Destrehan | LA | — | ◇ UNVERIFIED |
| CIClark Industrial INC. | Missoula | MT | — | ◇ UNVERIFIED |
| CMClearfield Metal Tech/clearfield Plt | Clearfield | PA | — | ◇ UNVERIFIED |
| CCCleveland Cliffs Steel Corporation - Ashland | Ashland | KY | — | ◇ UNVERIFIED |
| CRC&l Repair/fabrication LLC | Martins Ferry | OH | — | ◇ UNVERIFIED |
| CCCmc Construction Services | Columbia | SC | — | ◇ UNVERIFIED |
| CNCmc New Jersey | Sayreville | NJ | — | ◇ UNVERIFIED |
| CSCmc Steel Us, LLC - Martinsburg | Martinsburg | WV | — | ◇ UNVERIFIED |
| CSCmc Steel Us, Llc, Martinsburg | Martinsburg | WV | — | ◇ UNVERIFIED |
| CMCoastal Manufacturing | Watsonville | CA | — | ◇ UNVERIFIED |
| CFCode Fabrication INC | West Valley City | UT | — | ◇ UNVERIFIED |
| CFCold Finished Stainless | Houston | TX | — | ◇ UNVERIFIED |
| CSCol-fin Specialty Steel Ii LLC | New Brighton | PA | — | ◇ UNVERIFIED |
| CRCombustion Resources, LLC | Indianapolis | IN | — | ◇ UNVERIFIED |
| CCometals | Cayce | SC | — | ◇ UNVERIFIED |
| CMCommercial Metals Company | Etiwanda | CA | — | ◇ UNVERIFIED |
| CMCommercial Metals Company | Jacksonville | FL | — | ◇ UNVERIFIED |
| CIConnaughty Industries INC | Rushford | MN | — | ◇ UNVERIFIED |
| CMConsolidated Metals INC. | Jacksonville | FL | — | ◇ UNVERIFIED |
| CHConstruction Hotline and Management Partners, INC. | Santa Ana | CA | — | ◇ UNVERIFIED |
| CCContech Const Prod - Greencastle | Greencastle | PA | — | ◇ UNVERIFIED |
 Contech Engineered Solutions, LLC | Englewood | TN | — | ◇ UNVERIFIED |
| CSContinental Steel Corporation | Salt Lake City | UT | — | ◇ UNVERIFIED |
| CDControl Devices | Fenton | MO | — | ◇ UNVERIFIED |
| CICooksey Iron & Metal Company, INC. | Midville | GA | — | ◇ UNVERIFIED |
| CSCooksey Steel Company, INC. | Tifton | GA | — | ◇ UNVERIFIED |
| CSCooper Standard Automotive INC | New Lexington | OH | — | ◇ UNVERIFIED |
| CCCopperweld Chicago Division | Chicago | IL | — | ◇ UNVERIFIED |
| CSCopperweld - Stainless Div | Elizabethtown | KY | — | ◇ UNVERIFIED |
| CTCreative Tubes | Jacksboro | TN | — | ◇ UNVERIFIED |
| CFCrl Fab, LLC | Fort Myers | FL | — | ◇ UNVERIFIED |
| CICrucible INC Trent Tube Div Plt 1 | East Troy | WI | — | ◇ UNVERIFIED |
| CMCrucible Materials CORP Trent Tube Plants 1,3 | East Troy | WI | — | ◇ UNVERIFIED |
| CHCsr Hydro Conduit | Corona | CA | — | ◇ UNVERIFIED |
| CFCT&C Fab LLC | Erda | UT | — | ◇ UNVERIFIED |
| CWCTS Welding LLC | Bloomingdale | MI | — | ◇ UNVERIFIED |
| CWCTS Welding LLC | Bloomingdale | MI | — | ◇ UNVERIFIED |
| CSCuenca Steel Corporation | Miami | FL | — | ◇ UNVERIFIED |
| CICustom Ii Metal Fabrication and Welding | Bozeman | MT | — | ◇ UNVERIFIED |
| CSCustom Steel Fabricators, INC. | Columbia | TN | — | ◇ UNVERIFIED |
| COCycling on Two Wheels, LLC | Grovetown | GA | — | ◇ UNVERIFIED |
| DBDamascus Bishop Tube/greenville | Greenville | PA | — | ◇ UNVERIFIED |
| DRDayton Rogers Manufacturing company | Newberry | SC | — | ◇ UNVERIFIED |
| DRDayton Rogers of Ohio, Inc. | Obetz | OH | — | ◇ UNVERIFIED |
| DMDb Motoring Group, INC. | Miami | FL | — | ◇ UNVERIFIED |
| DDD & D Machine Works, INC. | Orem | UT | — | ◇ UNVERIFIED |
| DIDelos Industries Inc. | Payson | UT | — | ◇ UNVERIFIED |
| DPDelsea Pipe INC. | Sewell | NJ | — | ◇ UNVERIFIED |
| DEDema Engineering CO | Saint Louis | MO | — | ◇ UNVERIFIED |
| DSDetroit Steel CO Trenton | Trenton | MI | — | ◇ UNVERIFIED |
| DTDetroit Tube Products LLC | Detroit | MI | — | ◇ UNVERIFIED |
| DWDetroit Welded Tube | Detroit | MI | — | ◇ UNVERIFIED |
| DMDexter Marine Products LLC | San Marcos | CA | — | ◇ UNVERIFIED |
| DSDfp Systems | El Cajon | CA | — | ◇ UNVERIFIED |
| DSDirect Sales INC. | Hollywood | FL | — | ◇ UNVERIFIED |
| DMDiversified Metalworking, Inc. | Republic | MO | — | ◇ UNVERIFIED |
| DMDiversified Metalworking, Inc. | Republic | MO | — | ◇ UNVERIFIED |
| DMDiversified Metalworking, Inc. | Republic | MO | — | ◇ UNVERIFIED |
| DMDluhos Metal Works INC. | El Campo | TX | — | ◇ UNVERIFIED |
| DIDmcg, INC. | Norcross | GA | — | ◇ UNVERIFIED |
| DCDow Corning Alabama, INC. | Mount Meigs | AL | — | ◇ UNVERIFIED |
| DMD&s Metal Solutions LLC | Gilbert | AZ | — | ◇ UNVERIFIED |
| DSDubose Steel CORP. | Roseboro | NC | — | ◇ UNVERIFIED |
 Dunkirk Specialty Steel LLC | Dunkirk | NY | — | ◇ UNVERIFIED |
| DSDunn-wright Steel | Lapeer | MI | — | ◇ UNVERIFIED |
| EMEagle Manufacturing Company, INC. | Colchester | CT | — | ◇ UNVERIFIED |
| EAE and H Tubing | Brownstown | IN | — | ◇ UNVERIFIED |
| EIEarly Iron Restoration | Rochester | MN | — | ◇ UNVERIFIED |
| ECEast Coast Steel, INC. | Sewell | NJ | — | ◇ UNVERIFIED |
| ESEastern Steel | Mount Hope | WV | — | ◇ UNVERIFIED |
| ETEast Texas Radiator | Longview | TX | — | ◇ UNVERIFIED |
| ESEbenezer Steel | Phelan | CA | — | ◇ UNVERIFIED |
| EPEb Pipe Coating INC | Panama City | FL | — | ◇ UNVERIFIED |
| EHE & H Tubing Incorporated | Salem | IN | — | ◇ UNVERIFIED |
| ETE-h Tubing Incorporated | Brownstown | IN | — | ◇ UNVERIFIED |
| ECEl Campo Machine & Repair, INC. | El Campo | TX | — | ◇ UNVERIFIED |
| EIElectrolurgymfg. INC. | Santa Ana | CA | — | ◇ UNVERIFIED |
| ETElemco Tool LTD | Clinton Twp | MI | — | ◇ UNVERIFIED |
| ESElite Storage Solutions, LLC | Monroe | GA | — | ◇ UNVERIFIED |
