| Undefeated Tribe Operating Company LLC DBA Crunch Fitness TX | Arts & Entertainment | 0 | — | A |
| Under Armour CA | Transportation & Warehousing | 0 | — | A |
| Under Armour Nashville Distribution House TN | — | 0 | — | — |
| Under Armour Rialto Distribution House CA | — | 0 | — | — |
| Under Armour, Inc. MD | Wholesale Trade | 7 | $136,808 | — |
| Under Construction Builders, LLC NJ | Construction | 0 | — | A |
| Under the Mountain Underground CO | Construction | 0 | — | A |
| Undercar Products Group Inc. MI | Manufacturing | 0 | — | C |
| UnderCover Inc. MO | Manufacturing | 0 | — | B |
| Underdog Sports Holdings Inc NY | Arts & Entertainment | 3 | $243,333 | — |
| Underdog Technologies, Inc. NY | Professional & Technical Services | 1 | $168,300 | — |
| Underdogs Agency LLC OH | Professional & Technical Services | 1 | $40,914 | — |
| Underground Construction Co Inc CA | Construction | 0 | — | A |
| Underground Contractors, Incorporated MI | Construction | 0 | — | A |
| Underground Development, Ltd. CA | — | 0 | — | — |
| Underground Electric Construction Co LLC CA | Construction | 0 | — | A |
| Underground Pipeline Inc WI | Manufacturing | 0 | — | D |
| Underground Pipeline Services, LLC KS | Construction | 0 | — | A |
| Underground Solutions, Inc. CA | Wholesale Trade | 0 | — | A |
| Underground Systems Construction, Inc. KS | Construction | 0 | — | C |
| Underground Systems, LLC GA | Construction | 0 | — | A |
| Underground Utilities Inc OH | Construction | 0 | — | A |
| Underground Vaults & Storage Inc KS | Transportation & Warehousing | 0 | — | A |
| Underwater Construction Corporation CT | Construction | 0 | — | A |
| Underwater Construction Corporation MI | Construction | 0 | — | A |
| Underwater Construction Corporation TN | Construction | 0 | — | A |
| Underwater Resources, Inc. CA | Administrative & Waste Services | 0 | — | A |
| Underwood Bros dba AAA Landscape AZ | Administrative & Waste Services | 0 | — | F |
| Underwood Electric Inc. ME | Construction | 0 | — | D |
| Underwood Group I, LLC d/b/a Emerald Coast Tile & Granite FL | Manufacturing | 0 | — | F |
| Underwood Mold Company, Inc. GA | Manufacturing | 0 | — | F |
| Underwriters Laboratories Inc. IL | Professional & Technical Services | 9 | $101,722 | — |
| Undisputed Logistix LLC NJ | Transportation & Warehousing | 0 | — | A |
| Undocked Inc. GA | Professional & Technical Services | 2 | $135,650 | — |
| Uneeda Enterprizes Inc. NY | Manufacturing | 0 | — | F |
| UNEEQ, INC. TX | Professional & Technical Services | 1 | $170,000 | — |
| Uneven Labs Inc FL | Professional & Technical Services | 1 | $200,000 | — |
| Unex Manufacturing Inc NJ | Manufacturing | 0 | — | F |
| UNFI AL | Wholesale Trade | 0 | — | A |
| UNFI CA | Wholesale Trade | 0 | — | D |
| UNFI CO | Wholesale Trade | 0 | — | D |
| UNFI CT | Wholesale Trade | 0 | — | F |
| UNFI FL | Wholesale Trade | 0 | — | F |
| UNFI MS | Wholesale Trade | 0 | — | C |
| UNFI ND | Wholesale Trade | 0 | — | F |
| UNFI NH | Wholesale Trade | 0 | — | D |
| UNFI NJ | Wholesale Trade | 0 | — | F |
| UNFI NY | Wholesale Trade | 0 | — | D |
| UNFI PA | Wholesale Trade | 0 | — | F |
| UNFI RI | — | 0 | — | — |
