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| Name | Last Run |
|---|---|
| Ughrouda | Penn National, 24-Feb-24 |
| Uh Oh It's Magic | Fairmount Park, 31-Jul-24 |
| Uhavetobekittenme | Mountaineer, 02-Sep-24 |
| Ujs Flash | Zia Park, 05-Nov-23 |
| Ukraine Strong | Turf Paradise, 28-Mar-25 |
| Ukrainian Princess | Finger Lakes, 18-Jun-24 |
| Ulalume | Hawthorne, 20-Oct-25 |
| Ulikeapples | Gulfstream, 23-Mar-23 |
| Ultima Diva | Sunland Park, 24-Feb-25 |
| Ultima Grace | Keeneland, 07-Apr-25 |
| Ultimate | Canterbury Park, 18-Sep-25 |
| Ultimate Authority | Santa Anita, 20-Apr-25 |
| Ultimate Breeze | Charles Town, 14-Jan-24 |
| Ultimate Edition | Finger Lakes, 28-Jun-23 |
| Ultimate Fighter | Hawthorne, 20-Jun-25 |
| Ultimate Gamble | Del Mar, 31-Aug-25 |
| Ultimate Hy | Del Mar, 02-Aug-25 |
| Ultimate Irony | Mountaineer, 19-Sep-24 |
| Ultimate Love | Laurel Park, 06-Sep-25 |
| Ultimate Mission | Tampa Bay Downs, 27-Jan-25 |
| Ultimate Ready | Belmont At The Big A, 12-May-25 |
| Ultimate Strike | Churchill Downs, 01-Nov-25 |
| Ultimate Value | Fair Grounds, 22-Jan-24 |
| Ultra Cameo | Saratoga, 22-Aug-25 |
| Ultra Diva | Mountaineer, 13-May-25 |
| Ultra Dragon | Seoul, 05-Apr-25 |
| Ultra Game | Turf Paradise, 22-Jan-25 |
| Ultra Power | Del Mar, 24-Nov-24 |
| Ultra Shiny | Los Alamitos Racecourse, 03-Nov-25 |
| Ultra Wealthy | Los Alamitos Racecourse, 05-Oct-25 |
| Umbral | Monmouth Park, 11-Aug-25 |
| Umbralle | Santa Anita, 20-Oct-25 |
| Ume | Horseshoe Indianapolis, 14-Oct-25 |
| Umeboshi | Horseshoe Indianapolis, 27-Aug-24 |
| Ummsuquaim | Lingfield, 27-Mar-23 |
| Umneyaat | Woodbine, 24-Nov-24 |
| Un D Nyable | Horseshoe Indianapolis, 09-Sep-25 |
| Un Ojo | Aqueduct, 28-Jan-24 |
| Una Brava | Los Alamitos Racecourse, 07-Sep-25 |
| Una Dulce Flora | Los Alamitos Racecourse, 18-Aug-25 |
| Una Luna | Laurel Park, 11-Nov-23 |
| Una Mirada | Santa Anita, 18-Oct-25 |
| Una Palabra | Canterbury Park, 04-Jul-25 |
| Una Quaedam | Keeneland, 25-Oct-25 |
| Unabated | Gulfstream, 27-Jan-24 |
| Unable | Woodbine, 25-Aug-23 |
| Unadulterated | Philadelphia Park, 24-Aug-23 |
| Unaffected | Mountaineer, 21-Oct-25 |
| Unaffiliated | Fair Grounds, 14-Dec-24 |
| Unafrade | Horseshoe Indianapolis, 31-Jul-24 |
| Unalakleet | Mountaineer, 08-Oct-25 |
| Unaltered | Mountaineer Park, 22-Apr-24 |
| Unanimously | Louisiana Downs, 27-Sep-24 |
| Unapologetic | Remington Park, 17-Oct-25 |
| Unarmed | Assiniboia Downs, 11-Sep-25 |
| Unassuming | Ellis Park, 17-Aug-25 |
| Unattainable Love | Horseshoe Indianapolis, 26-Aug-25 |
| Unaudited | Finger Lakes, 16-Oct-25 |
| Unbeatable | Hawthorne, 13-Oct-25 |
| Unbelievable | Sha Tin, 09-Mar-25 |