Horses in United States
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| Name | Last Run |
|---|---|
| Unsolved Mystery | Monmouth Park, 15-Sep-25 |
| Unspoken Request | Gulfstream, 24-May-25 |
| Unstable Prince | Ellis Park, 09-Aug-25 |
| Unstable Princess | Presque Isle Downs, 18-Jul-24 |
| Unstable Storm | Fort Erie, 12-Aug-24 |
| Unstoppable Appeal | Gulfstream, 27-May-23 |
| Unstoppable Force | Canterbury Park, 31-Jul-23 |
| Unstoppable Me | Turf Paradise, 02-May-23 |
| Unsung Melody | Keeneland, 14-Oct-24 |
| Unsustainable | Golden State Racing, 24-Nov-24 |
| Unswayed | Philadelphia Park, 15-Apr-25 |
| Untamed Moment | Ellis Park, 17-Aug-25 |
| Untamed Shrew | Gulfstream, 30-Aug-25 |
| Untapped Energy | Mahoning Valley, 03-Jan-23 |
| Untempted | Will Rogers Downs, 10-Nov-25 |
| Until Last Call | Aqueduct, 13-Nov-25 |
| Untitled | Gulfstream, 30-Apr-23 |
| Untouched Elegance | Tampa Bay Downs, 13-Feb-25 |
| Untreated | Saratoga, 24-Aug-24 |
| Untroubled | Finger Lakes, 14-May-25 |
| Unusual Activity | Mahoning Valley, 08-Jan-26 |
| Unusual Code | Golden Gate Fields, 13-Jan-24 |
| Unusual Dancer | Turf Paradise, 17-Apr-24 |
| Unusual Measure | Santa Anita, 05-May-24 |
| Unusual N Rare | Turf Paradise, 23-Jan-26 |
| Unusual Suspect | Flemington, 01-Jan-13 |
| Unusual Win | Turf Paradise, 26-Mar-25 |
| Unusually Lucky | Charles Town, 23-Aug-24 |
| Unwanted Intruder | Fair Grounds, 19-Feb-24 |
| Unwavering | Sunray Park, 24-May-25 |
| Unwhirled | Thistledown, 15-Aug-24 |
| Unwoke | Finger Lakes, 27-Nov-25 |
| Unworkable | Turfway Park, 28-Dec-25 |
| Unwound | Sunland Park, 19-Jan-26 |
| Unwrapped | Turfway Park, 09-Feb-24 |
| Unwritten Code | Del Mar, 20-Jul-25 |
| Unxpected Tiger | Delaware Park, 16-Jun-24 |
| Unyielding | Mountaineer, 08-Oct-24 |
| Unzip Me Lord | Del Mar, 05-Aug-24 |
| Unzipped | Ellis Park, 07-Jul-24 |
| Uome | Mountaineer, 03-Sep-25 |
| Uottalikeit | Thistledown, 19-Sep-23 |
| Up A Lazy River | Los Alamitos Racecourse, 08-Dec-25 |
| Up Against It | Laurel Park, 18-Jan-25 |
| Up And Down | Keeneland, 08-Apr-24 |
| Up And Good | Lone Star Park, 16-Nov-25 |
| Up Country | Churchill Downs, 21-Nov-25 |
| Up For Adventure | Finger Lakes, 21-Nov-23 |
| Up For An Oscar | Gulfstream, 20-Dec-25 |
| Up For It | Laurel Park, 03-Nov-25 |
| Up For The Chance | Mountaineer Park, 27-Nov-24 |
| Up For The Hunt | Santa Anita, 18-Jan-26 |
| Up Her Sleeve | Mountaineer, 10-Dec-25 |
| Up In Arms | Mountaineer, 02-Dec-24 |
| Up In Flames | Laurel Park, 27-May-25 |
| Up In Time | Thistledown, 09-Sep-25 |
| Up N Gone | Fair Grounds, 24-Mar-25 |
| Up N Runnin | Penn National, 02-Aug-25 |
| Up N Up | Horseshoe Indianapolis, 07-Nov-24 |
| Up On The Edge | Oaklawn Park, 22-Dec-25 |