| UMUlrich Machine Works LLC | Bristow | OK | — | ◇ UNVERIFIED |
| UCUltraflote Corporation | Lubbock | TX | — | ◇ UNVERIFIED |
| UIUltra Industries INC | Wyoming | MN | — | ◇ UNVERIFIED |
| USUltra Specialties Incorporated | Elk Grove Village | IL | — | ◇ UNVERIFIED |
| UTUltra Tool and Manufacturing, Inc. | Rochester | NY | — | ◇ UNVERIFIED |
| UTUltra Tool Company LLC | Howell | MI | — | ◇ UNVERIFIED |
| UTUltra Tool & Mfg INC | Menomonee Falls | WI | — | ◇ UNVERIFIED |
| UUUncommon USA INC | Willmar | MN | — | ◇ UNVERIFIED |
| UPUnder Pressure Systems LLC | New Philadelphia | OH | — | ◇ UNVERIFIED |
| UCUnifab Corporation | Kalamazoo | MI | — | ◇ UNVERIFIED |
| UIUni-fab Industries INC | Fremont | CA | — | ◇ UNVERIFIED |
| UEUnified Equipment Systems INC | Clinton Township | MI | — | ◇ UNVERIFIED |
| UMUnified Manufacturing INC | Valencia | CA | — | ◇ UNVERIFIED |
| UIUnimatic INC | Minneapolis | MN | — | ◇ UNVERIFIED |
| UIUnimatic INC | Saint Louis Park | MN | — | ◇ UNVERIFIED |
| UCUnion Corrugating | Ocala | FL | — | ◇ UNVERIFIED |
| UTUnion Tank Car Company | East Chicago | IN | — | ◇ UNVERIFIED |
| UTUnion Tank Car CO - Valdosta Facility | Valdosta | GA | — | ◇ UNVERIFIED |
| UOUniparts Olsen, INC. | — | IA | — | ◇ UNVERIFIED |
| UMUnique Machine & Tool | Mc Kees Rocks | PA | — | ◇ UNVERIFIED |
| UMUnique Metal Fabrication INC | Phoenix | AZ | — | ◇ UNVERIFIED |
| UMUnique Metal Products LLC | Eugene | OR | — | ◇ UNVERIFIED |
| UIUnison Industries LLC Plant 2 | Dayton | OH | — | ◇ UNVERIFIED |
| ULUnitech Lc | Salt Lake City | UT | — | ◇ UNVERIFIED |
| UAUnited Airlines, INC. | Newark | NJ | — | ◇ UNVERIFIED |
| UBUnited Best Sheet Metal | Arcadia | CA | — | ◇ UNVERIFIED |
| UFUnited Fabrication | Salt Lake City | UT | — | ◇ UNVERIFIED |
| UIUnited Industries, INC. | Odessa | TX | — | ◇ UNVERIFIED |
| ULUnited Lighting Standards, INC. | Warren | MI | — | ◇ UNVERIFIED |
| UMUnited Machining, Inc | Sutton | MA | — | ◇ UNVERIFIED |
| UMUnited Machining, INC. | Englewood | CO | — | ◇ UNVERIFIED |
| UMUnited Mechanical & Metal Fabricators, Inc. | Union City | CA | — | ◇ UNVERIFIED |
| UMUnited Metal Services | Houston | TX | — | ◇ UNVERIFIED |
| UMUnited Misc. & Ornamental Steel, Inc. | Union City | CA | — | ◇ UNVERIFIED |
| UPUnited Partition Systems Inc | Ontario | CA | — | ◇ UNVERIFIED |
| UPUnited Performance Metals | La Mirada | CA | — | ◇ UNVERIFIED |
| UPUnited Pipe Bending & Fabrication INC | Portland | OR | — | ◇ UNVERIFIED |
| USUnited Scientific INC | Saint Paul | MN | — | ◇ UNVERIFIED |
| USUnited Spring & Mfg. Co. | Chicago | IL | — | ◇ UNVERIFIED |
| USUnited Spring Technology INC | Farmington Hills | MI | — | ◇ UNVERIFIED |
| USUnited Steel Ventures INC Dba United Precision Mac | Edina | MN | — | ◇ UNVERIFIED |
| USUnited Support Solutions INC. | Totowa | NJ | — | ◇ UNVERIFIED |
| UTUnited Team Mechanical, LLC | Kaysville | UT | — | ◇ UNVERIFIED |
| UWUnited Weld Services, LLC | York | PA | — | ◇ UNVERIFIED |
| UTUnity Tool INC Dba Unity Precision Manufacturing | Maple Grove | MN | — | ◇ UNVERIFIED |
| UCUniversal Compression INC | Tulsa | OK | — | ◇ UNVERIFIED |
 Universal Compressor Solutions LLC | Mayfield | KY | — | ◇ UNVERIFIED |
| UDUniversal Dust Collector Mfg & Supply CORP Dba Udc Corporation | Anaheim | CA | — | ◇ UNVERIFIED |
| UFUniversal Fabricators INC | Madison Heights | MI | — | ◇ UNVERIFIED |
| UFUniversal Formations INC | Burnsville | MN | — | ◇ UNVERIFIED |
