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| Name ▲ | Age | Gender | Owner | Actions |
|---|---|---|---|---|
| Ullalum | 10 | Stallion | Final Furlong | View |
| Ultimate Magic | 4 | Stallion | Rainee Thoroughbreds | View |
| Ultimate Nitemare | 10 | Stallion | Final Furlong | View |
| Ultimate Predator | 6 | Stallion | Gant's Farm | View |
| Ultimate Score | 4 | Stallion | Rainee Thoroughbreds | View |
| UltimoHonorAntiguo | 5 | Stallion | Gintara Lodge | View |
| Ultracrepidarian | 10 | Mare | Gant's Farm | View |
| Ultraman | 6 | Stallion | Gant's Farm | View |
| Ultraviolence | 2 | Colt | Hidden Oak Farm | View |
| Ulysses S | 7 | Stallion | Ivy Creek Farm | View |
| Umatilla | 6 | Stallion | Gant's Farm | View |
| Unable to Resist | 9 | Stallion | Gintara Lodge | View |
| Unagi | 8 | Stallion | Marshall Creek Ranch | View |
| Unalive | 2 | Filly | Fair Isle Farm | View |
| Unassuming | 6 | Mare | Gintara Lodge | View |
| UnassumingStart | 6 | Mare | Hidden Oak Farm | View |
| Unbreakable Heart | 3 | Colt | Viscount Lodge | View |
| Unbreakable Kiss | 2 | Filly | Denoux Stud | View |
| Ch. Unbridled Navy | 5 | Stallion | Renegade Racing and Breeding | View |
| Unbridled Son | 4 | Stallion | Starfish Stables | View |