| Name | Color | Sex | Year of birth | Microchip | Sire | Dam | Breed | Breeder |
|---|---|---|---|---|---|---|---|---|
| Sygnet | c | 1944 | Thoroughbred | Italy | ||||
| Sylistrja | bay | f | 1947 | William of Valence | Sylmar | Thoroughbred | Great Britain | |
| Sylla | chestnut | f | 1931 | Thoroughbred | France | |||
| Sylmar | br. | f | 1937 | Easton | Sweet Olive | Thoroughbred | Great Britain | |
| Sylph | bay | f | 1877 | Glenelg | Squeeze-Em | Thoroughbred | USA | |
| Sylva | grey | f | 1762 | Belsize Arabian | Partner mare | Thoroughbred | Great Britain | |
| Sylva Belle | chestnut | f | 1887 | Saint Editha | Thoroughbred | Great Britain | ||
| Sylvan | chestnut | f | 1910 | Disguise | Sylva Belle | Thoroughbred | USA | |
| Sylvanecte | f | Silver Shark | Caledonian Market | Thoroughbred | France | |||
| Sylvia | chestnut | f | 1783 | Young Marske | Ferret | Thoroughbred | Great Britain |