| Name | Color | Sex | Year of birth | Microchip | Sire | Dam | Breed | Breeder |
|---|---|---|---|---|---|---|---|---|
| Ace of Spades | bay | f | 1947 | Atout Maitre | Brave Empress | Thoroughbred | Great Britain | |
| Ace Ventura | chestnut | c | 2019 | 643090000419910 | 1458-7 Neulovimyi | 3065-5 It's a Game | Thoroughbred | Nadir Farm |
| 5597-7 Achaluki | bay | f | 2012 | 985101045196597 | Kheleyf | Simil | Thoroughbred | Ireland |
| 0054-2 Achara | bay | f | 1989 | 3437-1 Rom | 4927 Azartnaya | Thoroughbred | Kullar Stud | |
| 1412-7 Achernar | chestnut | c | 2010 | 250259806003793 | Lemon Drop Kid | Ikat | Thoroughbred | USA |
| Acheron | black | c | 1829 | Thoroughbred | Great Britain | |||
| 3996-6 Achi Bonakkorsi | d.-bay | f | 2009 | 643110000212522 | Arch | Conquestress | Thoroughbred | USA |
| Achievement | br. | f | 1864 | Stockwell | Paradigm | Thoroughbred | Great Britain | |
| 1772-7 Achill | bay | c | 2012 | 643090000218033 | Flower Alley | Enterprise Beach | Thoroughbred | Lickity Split Services |
| Achillea | f | 1978 | Klondyke Bill | Reckless Lady | Thoroughbred | France |