| UMUnion Metal Industries CORP | Canton | OH | — | ◇ UNVERIFIED |
| UAUnited Alloys INC | Los Angeles | CA | — | ◇ UNVERIFIED |
| UMUnited Metalcraft, INC. | Marietta | GA | — | ◇ UNVERIFIED |
| UMUnited Millwright LLC | Mt Zion | IL | — | ◇ UNVERIFIED |
| UMUnited Millwright LLC | Mt Zion | IL | — | ◇ UNVERIFIED |
| UMUnited Misc & Ornamental Steel INC Dba Umo Steel INC | Union City | CA | — | ◇ UNVERIFIED |
| UPUnited Panel Corporation | Cartersville | GA | — | ◇ UNVERIFIED |
| UPUnited Panel Corporation | Griffin | GA | — | ◇ UNVERIFIED |
| USUnited States Steel Corporation | Worcester | MA | — | ◇ UNVERIFIED |
| USUnited Steel Fabricators INC | Rialto | CA | — | ◇ UNVERIFIED |
| USUnited Steel, INC. | Wichita | KS | — | ◇ UNVERIFIED |
| USUnited Steel Products | Largo | FL | — | ◇ UNVERIFIED |
| USUnited Steel Products Company, INC. | Livermore | CA | — | ◇ UNVERIFIED |
| USUnited Steel Works, INC. | Clearwater | FL | — | ◇ UNVERIFIED |
| USUnited Steel Works, INC. | Clearwater | FL | — | ◇ UNVERIFIED |
| USUnited Structural Works, INC. | Congers | NY | — | ◇ UNVERIFIED |
| USUnited Structures of Georgia LLC | Cairo | GA | — | ◇ UNVERIFIED |
| UTUnited Tube Corparation | Medina | OH | — | ◇ UNVERIFIED |
| URUnitrac Railroad Materials INC. | Knoxville | TN | — | ◇ UNVERIFIED |
| UEUniversal Enterprises, INC. | Shinnston | WV | — | ◇ UNVERIFIED |
| UFUniversal Fabricating & Construction Ser | Columbus | OH | — | ◇ UNVERIFIED |
| UFUniversal Fabricators, LLC | Eglin Afb | FL | — | ◇ UNVERIFIED |
| UHUniversal Head CO INC | Joliet | IL | — | ◇ UNVERIFIED |
| UMUniversal Machine Company INC | Paramount | CA | — | ◇ UNVERIFIED |
| UMUniversal Metal Hose Company | Chicago | IL | — | ◇ UNVERIFIED |
| UOUniversal Ornamental Iron, INC. | Conyers | GA | — | ◇ UNVERIFIED |
 Universal Stainless & Alloy Products INC. | North Jackson | OH | — | ◇ UNVERIFIED |
| USUniversal Steel Fabricators, INC. | Brooklyn | NY | — | ◇ UNVERIFIED |
| USUniversal Steel of North Carolina, LLC | Thomasville | NC | — | ◇ UNVERIFIED |
| UTUniversal Tool Steel LLC | Springfield | TN | — | ◇ UNVERIFIED |
| UIUnobtanium INC | Oregon City | OR | — | ◇ UNVERIFIED |
| UVUpper Valley Design LLC | Alstead | NH | — | ◇ UNVERIFIED |
| USUpright Steel Fabricators and Erectors LLC | Cleveland | OH | — | ◇ UNVERIFIED |
| UMUpson Metal Fabricators | San Jacinto | CA | — | ◇ UNVERIFIED |
| UAUrbanovsky Advanced Construction, LLC | Cleburne | TX | — | ◇ UNVERIFIED |
| UWUSA Waste (monroeville Landfill) | Monroeville | PA | — | ◇ UNVERIFIED |
| UBU.s. Bridge | Cambridge | OH | — | ◇ UNVERIFIED |
| ULUscoe Louisville Repair Sta | Louisville | KY | — | ◇ UNVERIFIED |
| UDU.s. Defense National Stockpile Center Point Pleasant Depot | Point Pleasant | WV | — | ◇ UNVERIFIED |
| UOUsdol Osha - Atlanta West Ao | Acworth | GA | — | ◇ UNVERIFIED |
| UOUsdol Osha - Cincinnati Area Office | Springboro | OH | — | ◇ UNVERIFIED |
| UDU.s. Dol-osha Corpus Christi Area Office | Mcallen | TX | — | ◇ UNVERIFIED |
| UOUsdol Osha - (mobile) | Cowarts | AL | — | ◇ UNVERIFIED |
| UOUsdol Osha - (mobile) | Saraland | AL | — | ◇ UNVERIFIED |
| UOUsdol Osha - (mobile) | Calvert | AL | — | ◇ UNVERIFIED |
| UOUsdol Osha- North Aurora | Carol Stream | IL | — | ◇ UNVERIFIED |
| UUUsemco Universal Sanitary Equipment Mfg | Tomah | WI | — | ◇ UNVERIFIED |
| UMUS Machine INC | Fairmont | WV | — | ◇ UNVERIFIED |
| UMUS Metal Works INC | Sandy | OR | — | ◇ UNVERIFIED |
| UNUS National Steel LLC | Stuart | FL | — | ◇ UNVERIFIED |
