| Name | Color | Sex | Year of birth | Microchip | Sire | Dam | Breed | Breeder |
|---|---|---|---|---|---|---|---|---|
| Act Quickly | bay | f | 2006 | Awesome Again | Instant Thought | Thoroughbred | USA | |
| Act So Noble | bay | f | 1999 | Wavering Monarch | Driven to Drink | Thoroughbred | USA | |
| Actaeon | chestnut | c | 1822 | Scud | Thoroughbred | Great Britain | ||
| Actaeon-mare | f | Thoroughbred | Great Britain | |||||
| Actek | chestnut | c | 1970 | 3004 Effekt | 1725 Amplituda | Thoroughbred | Beslansk Stud | |
| 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 |