| Name | Color | Sex | Year of birth | Microchip | Sire | Dam | Breed | Breeder |
|---|---|---|---|---|---|---|---|---|
| Action | bay | f | 1904 | Tarporley | Thoroughbred | Great Britain | ||
| Action d'Oro | bay | c | 2019 | 981020033100992 | Vancouver | Call to Action | Thoroughbred | Hartwell Farm Inc. & Catherine Hudson |
| Action de Grace | chestnut | f | 1994 | Riverman | Action Francaise | Thoroughbred | USA | |
| Action Francaise | d.-bay | f | 1985 | Nureyev | Allez France | Thoroughbred | USA | |
| Action Music | d.-bay | f | 1993 | Seattle Song | Abloom | Thoroughbred | USA | |
| Action This Day | bay | c | 2001 | Kris S | Najecam | Thoroughbred | USA | |
| Actium | bay | f | 1893 | Abonnent | Thoroughbred | Austria | ||
| Activar | bay | f | 1981 | Naskra | Speed On | Thoroughbred | USA | |
| Activate | bay | f | 1946 | Thoroughbred | Great Britain | |||
| 2774-5 Active Lemon | chestnut | f | 2006 | 643094100000822 | Lemon Drop Kid | Autumn Creek | Thoroughbred | USA |