| USUnited States Pipe & Foundry Company LLC | Naperville | IL | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| UAUS Aluminum | Cicero | IL | Primary Metal Manufacturing331319 | — | ◇ UNVERIFIED |
| UDU.s. Department of Labor-osha | Red Bud | IL | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| UDU.s. Department of Labor-osha | Belleville | IL | Primary Metal Manufacturing331522 | — | ◇ UNVERIFIED |
| UOUsdol Osha- North Aurora | Somonauk | IL | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| UOUsdol Osha- North Aurora | Union | IL | Primary Metal Manufacturing331111 | — | ◇ UNVERIFIED |
| UOUsdol Osha- North Aurora | Plano | IL | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| UOUsdol Osha- North Aurora | South Elgin | IL | Primary Metal Manufacturing331316 | — | ◇ UNVERIFIED |
| UOUsdol Osha- North Aurora | Batavia | IL | Primary Metal Manufacturing331528 | — | ◇ UNVERIFIED |
| USUS Scrap Metal CO | Decatur | IL | Primary Metal Manufacturing331410 | — | ◇ UNVERIFIED |
| VMViakable Mfg LLC | Lasalle | IL | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
| VMViakable Mfg LLC | Lasalle | IL | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
| WWWalker Wire & Steel CO | Pontiac | IL | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| WWWalter Wire Edm Service* | Downers Grove | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| WMWheeling Metal Processing, LTD. | Chicago | IL | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| WAWintec Associates, INC. | Northbrook | IL | Primary Metal Manufacturing331312 | — | ◇ UNVERIFIED |
| WFWirco Foundry Division | Champaign | IL | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| ZIZekelman Industries Wheatland Tube CO | Chicago | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
