| Name | Color | Sex | Year of birth | Microchip | Sire | Dam | Breed | Breeder |
|---|---|---|---|---|---|---|---|---|
| 0525-4 Unabashed | d.-bay | c | 2001 | 643094100002120 | Kingmambo | Blushing Madame | Thoroughbred | USA |
| Unabi | bay | f | 2015 | не введен | Afleet Alex | 3946-6 Unbridled Overture | Thoroughbred | Studfarm "711" |
| Unaccounted For | bay | c | 1991 | Private Account | Mrs. Jenney | Thoroughbred | USA | |
| Unacloud | grey | f | 1997 | Unaccounted For | Cloud's Ambre | Thoroughbred | USA | |
| Unadilla | bay | f | 1961 | Swoon's Son | Thoroughbred | USA | ||
| Unanime | chestnut | c | 1967 | Pretexto | Aclamacion | Thoroughbred | Argentina | |
| Unappeased | bay | f | 2009 | Galileo | Angelic Song | Thoroughbred | Ireland | |
| Unavenged | d.-bay | f | 2009 | Empire Maker | Naughty Natisha | Thoroughbred | USA | |
| Unbreakable | black | c | 1935 | Sickle | Blue Glass | Thoroughbred | USA | |
| Unbridled | bay | c | 1987 | Fappiano | Gana Facil | Thoroughbred | USA |