| Name | Color | Sex | Year of birth | Microchip | Sire | Dam | Breed | Breeder |
|---|---|---|---|---|---|---|---|---|
| Symphorosa | bay | f | 1926 | Light Brigade | Rose des Vents | Thoroughbred | USA | |
| Symra | bay | f | 2001 | 3641-1 Akvarium | 1585-3 Sigara | Thoroughbred | Abazinsky Farm | |
| Syn Gor | bay | c | 2016 | 643090000168565 | 1096-5 Sky Pride | 4245-6 Istora | Thoroughbred | Mr Geremeev V.S. |
| 1858-7 Syn Polka | bay | c | 2015 | 643090000215898 | 0919-5 Own Soup | 6337-8 Si Fo | Thoroughbred | Alokov A.A. |
| Syn Yaponchika | chestnut | c | 2021 | 643090000561824 | 1680-7 Yaponchik | 5951-7 Armada Yu | Thoroughbred | Mrs Krasnopolskaya E.Y. |
| · Synam | chestnut | c | 2004 | 643094100000118 | 0374-3 Neshvik | 0644-2 Saga | Thoroughbred | Mr Chotchaev A.A. |
| Synastry | bay | c | 1983 | Seattle Slew | Municipal Bond | Thoroughbred | USA | |
| Synchronize | bay | f | 1999 | 0459-4 Entrepreneur | Eschasse | Thoroughbred | Ireland | |
| Syncopate | bay | c | 1975 | Marshua's Dancer | Sunny Today | Thoroughbred | USA | |
| Syncopation | bay | f | 1958 | Infatuation | Dinkie Melody | Thoroughbred | Great Britain |