| Name | Color | Sex | Year of birth | Microchip | Sire | Dam | Breed | Breeder |
|---|---|---|---|---|---|---|---|---|
| Unterwegs | chestnut | f | 1942 | Thoroughbred | Germany | |||
| Untidy | bay | f | 1920 | Sweep | Cafe Au Lait | Thoroughbred | USA | |
| Untitled | bay | f | 1976 | Vaguely Noble | Artists Proof | Thoroughbred | Ireland | |
| Untold | chestnut | f | 1983 | Final Straw | Unsuspected | Thoroughbred | Great Britain | |
| Untouched Talent | bay | f | 2004 | Storm Cat | Parade Queen | Thoroughbred | USA | |
| 0745-2 Untziya | bay | f | 1993 | 643094100001425 | 3621-1 Stimul | 7439-1 Sagiteya | Thoroughbred | APK "Kavkaz" |
| Unusual Heat | d.-bay | c | 1990 | Nureyev | Rossard | Thoroughbred | USA | |
| Unwetter | f | Waldcanter | Thoroughbred | |||||
| Uoker | bay | c | 2001 | 0103-2 Corvinius | 0740-2 Uzhimka | Thoroughbred | APK "Kavkaz" | |
| Uoll Kap | bay | c | 2013 | не введен | 0103-2 Corvinius | 1891-4 Ulviia | Thoroughbred | APK "Kavkaz" |