| UNMA | Unum Group 6.250% JR NT58 | Financial Services | $14.6B | — | 0 |
| UMAC | Unusual Machines, Inc. | Technology | $1.1B | — | 0 |
| KUBR | Uonlive Corporation | — | — | — | 0 |
| TIGR | UP Fintech Holding Ltd. Sponsored ADR Class A | Financial Services | $840M | — | 0 |
| UPYY | UPAY, Inc. | Technology | $15.9M | — | 0 |
| UPBD | Upbound Group, Inc. | Technology | $925M | — | 0 |
| UPXI | Upexi, Inc. | Communication Services | $85.9M | — | 0 |
| UPLD | Upland Software, Inc. | Technology | $10.3M | — | 0 |
| UPST | Upstart Holdings, Inc. | Financial Services | $2.4B | — | 0 |
| UPB | Upstream Bio, Inc. | Healthcare | $281M | — | 0 |
| UPX | Uptrend Holdings Ltd | — | — | — | 0 |
| UPWK | Upwork Inc. | Industrials | $997M | — | 0 |
| URG | Ur-Energy Inc. | Energy | $449M | — | 0 |
| UEC | Uranium Energy Corp. | Energy | $4.7B | — | 0 |
| UROY | Uranium Royalty Corp. | Energy | $623M | — | 0 |
| UE | Urban Edge Properties | Real Estate | $2.5B | — | 0 |
| UONEK | Urban One, Inc. | Communication Services | $21.3M | — | 0 |
| URBN | Urban Outfitters, Inc. | Consumer Cyclical | $6.4B | — | 0 |
| URGN | UroGen Pharma Ltd. | Healthcare | $2.0B | — | 0 |
| URSB | URSB Bancorp, Inc. | — | — | — | 0 |
| URZEF | URZ3 Energy Corp. | Energy | $7.3M | — | 0 |
| ULIT | US Elemental Inc. | — | — | — | 0 |
| USFD | US Foods Holding Corp. | Consumer Defensive | $20.7B | — | 0 |
| USAC | USA Compression Partners, LP | Energy | $3.7B | — | 0 |
| USAR | USA Rare Earth Inc | Basic Materials | $2.1B | — | 0 |