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| Name | Last Run |
|---|---|
| Under Advisement | Churchill Downs, 27-Jun-24 |
| Under Budget | Assiniboia Downs, 14-May-25 |
| Under Contract | Remington Park, 24-Aug-25 |
| Under Fire | Penn National, 29-Oct-22 |
| Under Oath | Fonner Park, 27-Apr-25 |
| Under Siege | Kembla Grange, 13-Jun-09 |
| Under Surveillance | Woodbine, 12-May-25 |
| Under The Bed | Turfway Park, 27-Mar-25 |
| Under The Gun | Monmouth Park, 13-May-24 |
| Under The Knife | Finger Lakes, 21-Nov-23 |
| Under The Overpass | Charles Town, 16-Aug-24 |
| Under The Palms | Horseshoe Indianapolis, 21-Aug-25 |
| Under The Radar | Delaware Park, 03-Aug-25 |
| Under The Stars | Santa Anita, 26-Dec-22 |
| Under Who's Radar | Finger Lakes, 22-Oct-24 |
| Underappreciated | Keeneland, 19-Oct-25 |
| Underated | Ruidoso Downs, 23-Jun-25 |
| Underbid Brittany | Charles Town, 24-Aug-25 |
| Underbidder | Belmont At The Big A, 03-Oct-25 |
| Underboss | Charles Town, 12-May-24 |
| Undercover | Oaklawn Park, 28-Dec-24 |
| Undercover Agent | Ellis Park, 21-Jul-25 |
| Undercover Girl | Fair Grounds, 09-Mar-25 |
| Undercover Lady | Mountaineer, 27-Jun-24 |
| Underdog | Delaware Park, 10-Aug-23 |
| Underdressed | Horseshoe Indianapolis, 28-Aug-25 |
| Underhill's Tab | Churchill Downs, 26-Jun-25 |
| Underinvested | Monmouth Park, 22-Jun-24 |
| Undernumbered | Sunland Park, 07-Mar-25 |
| Underrated | Charles Town, 23-Nov-24 |
| Understandable | Los Alamitos Racecourse, 18-Aug-25 |
| Understudy Kitty | Delaware Park, 14-Aug-25 |
| Undertaker | Keeneland, 12-Oct-25 |
| Underthemistletoe | Belmont At The Big A, 20-Oct-24 |
| Undertone | Delaware Park, 10-Oct-25 |
| Undertow | Mountaineer, 31-Jul-25 |
| Undervalued Asset | Belmont At The Big A, 29-Oct-23 |
| Underworld Goddess | Los Alamitos Racecourse, 12-Oct-25 |
| Undetected | Mountaineer, 26-Oct-23 |
| Undici | Penn National, 19-Jul-25 |
| Undismayed | Horseshoe Indianapolis, 19-Oct-23 |
| Undisputable | Ellis Park, 24-Aug-25 |
| Undisputed | Belmont At The Big A, 06-Oct-25 |
| Undisturbed | Santa Rosa, 06-Aug-23 |
| Undo The Right | Sam Houston Race Park, 06-Apr-25 |
| Undoubtedly | Horseshoe Indianapolis, 13-Jul-23 |
| Undress | Tampa Bay Downs, 06-Jan-24 |
| Une De Mai | Fort Erie, 02-Sep-25 |
| Uneedtocomehome | Thistledown, 14-May-25 |
| Unequivocal | Laurel Park, 07-Oct-23 |
| Unequivocally | Gulfstream, 15-Sep-24 |
| Unescorted | Mountaineer Park, 14-Nov-24 |
| Uneven Kiel | Horseshoe Indianapolis, 11-Jul-25 |
| Unexpectable | Finger Lakes, 06-Jun-23 |
| Unexpectedvalentyn | Mountaineer, 10-Jun-24 |
| Unexpectyd | Will Rogers Downs, 10-Nov-25 |
| Unfaithful Ways | Mountaineer, 12-Dec-24 |
| Unfathomed | Fair Grounds, 14-Mar-24 |
| Unfettered Diva | Penn National, 04-May-24 |
| Unfiltered Honey | Gulfstream, 13-Apr-24 |