| United Site Services VA | Administrative & Waste Services | 0 | — | D |
| United Site Services WA | Administrative & Waste Services | 0 | — | F |
| UNITED SITE SERVICES, INC. MA | Administrative & Waste Services | 1 | $230,308 | C |
| United Skin Specialists MN | Healthcare & Social Assistance | 0 | — | A |
| United Software Corporation TX | Professional & Technical Services | 4 | $89,154 | — |
| United Software Group, Inc. OH | Professional & Technical Services | 1 | $120,598 | — |
| United Solar Ovonic LLC MI | — | 0 | — | — |
| United Solutions, Inc. WI | — | 0 | — | — |
| United Source One, Inc. MD | Wholesale Trade | 0 | — | B |
| UNITED SPACE ALLIANCE (USA) AL | — | 0 | — | — |
| United Space Alliance, LLC FL | — | 0 | — | — |
| United Space Alliance, LLC TX | — | 0 | — | — |
| United Space Alliance, LLC (JSC) - Houston2 TX | — | 0 | — | — |
| United Space Alliance, LLC - Houston10 TX | — | 0 | — | — |
| United Space Alliance, LLC - Houston11 TX | — | 0 | — | — |
| United Space Alliance, LLC - Houston2 TX | — | 0 | — | — |
| United Space Alliance, LLC - Houston3 TX | — | 0 | — | — |
| United Space Alliance, LLC - Houston4 TX | — | 0 | — | — |
| United Space Alliance, LLC - Houston5 TX | — | 0 | — | — |
| United Space Alliance, LLC - Houston6 TX | — | 0 | — | — |
| United Space Alliance, LLC - Houston7 TX | — | 0 | — | — |
| United Space Alliance, LLC - Webster TX | — | 0 | — | — |
| United Space Alliance, LLC-Bay Terrace II TX | — | 0 | — | — |
| United Space Alliance, LLC-Houston10 TX | — | 0 | — | — |
| United Space Alliance, LLC-Houston2 TX | — | 0 | — | — |
| United Space Alliance, LLC-Houston3 TX | — | 0 | — | — |
| United Space Alliance, LLC-Houston4 TX | — | 0 | — | — |
| United Space Alliance, LLC-Houston5 TX | — | 0 | — | — |
| United Space Alliance, LLC-Houston6 TX | — | 0 | — | — |
| United Space Alliance, LLC-Houston7 TX | — | 0 | — | — |
| United Space Alliance, LLC-Houston9 TX | — | 0 | — | — |
| United Space Alliance, LLC-LockheedMartin Facility TX | — | 0 | — | — |
| UNITED SPECTRUM SOLUTIONS, LLC VA | Retail Trade | 3 | $74,755 | — |
| United Spiral Pipe, LLC CA | — | 0 | — | — |
| United Sporting Companies Ellett Brothers, LLC SC | — | 0 | — | — |
| United Sports Brands MN | — | 0 | — | — |
| United Spray LLC NY | Construction | 0 | — | A |
| UNITED STAFFING - ASSOCIATES INC NJ | Professional & Technical Services | 1 | $103,500 | — |
| United Stars PA | Manufacturing | 0 | — | F |
| United Stars Inc. IL | Manufacturing | 0 | — | A |
| United State Enrichment Corporation (USEC) KY | — | 0 | — | — |
| United State Recycling, Inc. PA | Administrative & Waste Services | 0 | — | A |
| United States AZ | Manufacturing | 0 | — | A |
| United States Air Compressor Incorporated MN | Manufacturing | 1 | $98,400 | — |
| United States Air Force OK | Manufacturing | 0 | — | F |
| United States Alliance Fire Protection, Inc. IL | Construction | 0 | — | A |
| United States Bakery OR | Manufacturing | 0 | — | F |
| United States Bakery Dba Franz Bakery Springfield Division CA | Manufacturing | 0 | — | F |
| United States Bakery Dba Franz Bakery Springfield Division OR | Manufacturing | 0 | — | F |
| United States Bakery DBA Franz Family Bakeries AK | Manufacturing | 0 | — | D |
