| TMTruemark Metals, LLC | Alabaster | AL | — | ◇ UNVERIFIED |
 Truenorth Steel - Huron | Huron | SD | — | ◇ UNVERIFIED |
| Truenorth Steel, INC. | Missoula | MT | — | ◇ UNVERIFIED |
 Tru Flow Systems INC. | Lake Point | UT | — | ◇ UNVERIFIED |
| TITsgc, INC. | Corpus Christi | TX | — | ◇ UNVERIFIED |
| TMTSG Management, LLC | Wyandotte | MI | — | ◇ UNVERIFIED |
| TMTsi/architectural Metals, INC. | Upper Marlboro | MD | — | ◇ UNVERIFIED |
| TTT&s Tubular Solutions | Hale | MI | — | ◇ UNVERIFIED |
| TIT&t Industrial Spray Coating | Lowell | MA | — | ◇ UNVERIFIED |
| TITunl Industries, INC | Irvine | CA | — | ◇ UNVERIFIED |
| TMTurnbull Metal Products | Gulfport | MS | — | ◇ UNVERIFIED |
| TITurner Industries Group LLC - Pipe Fabrication Division | New Iberia | LA | — | ◇ UNVERIFIED |
| TMTurner Mfg. CO. INC. | Fresno | CA | — | ◇ UNVERIFIED |
| TOT&v Optimum, LLC | Lockhart | TX | — | ◇ UNVERIFIED |
| TITwenty-Two, Inc. | Mundelein | IL | — | ◇ UNVERIFIED |
| USUltimate Steel & Fabrication LLC | Mechanicsville | MD | — | ◇ UNVERIFIED |
| UWUltimate Workmanship LLC | Cedar City | UT | — | ◇ UNVERIFIED |
| UMUmi Metalfab | Menomonee Falls | WI | — | ◇ UNVERIFIED |
| USUnico Steel, INC. | City of Industry | CA | — | ◇ UNVERIFIED |
| UTUniform Tubes INC | South Plainfield | NJ | — | ◇ UNVERIFIED |
| UMUnion Metal - Canton | Canton | OH | — | ◇ UNVERIFIED |
| UMUnion Metal Industries CORP | Canton | OH | — | ◇ 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 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 |
| UEUniversal Elec Bus | Canonsburg | PA | — | ◇ 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 Metal Hose Company | Chicago | IL | — | ◇ UNVERIFIED |
| UOUniversal Ornamental Iron, INC. | Conyers | GA | — | ◇ 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 |
