| Name ▼ | Age | Gender | Owner | Actions |
|---|---|---|---|---|
| Sparkler | 12 | Mare | Marshall Creek Ranch | View |
| Sparkle and Shine | 14 | Mare | Final Furlong | View |
| Spark of Silver | 15 | Mare | Final Furlong | View |
| Spanish Silver | 14 | Mare | Final Furlong | View |
| Spanish Potion | 14 | Mare | Final Furlong | View |
| Spanish League | 14 | Mare | Final Furlong | View |
| Spanish Jazz | 15 | Mare | Viscount Lodge | View |
| Spanish Guitar | 18 | Mare | Final Furlong | View |
| Spalona | 16 | Mare | Final Furlong | View |
| Spacetime | 14 | Mare | Final Furlong | View |
| SpaceFinalFrontier | 8 | Mare | Littlefield | View |
| Space Venture | 13 | Mare | Hidden Oak Farm | View |
| Space Odyssey | 8 | Mare | Desert Wind Farm | View |
| Space Dance | 8 | Mare | Final Furlong | View |
| Soviet Song | 11 | Mare | Final Furlong | View |
| Sovereign Light | 14 | Mare | Hidden Oak Farm | View |
| Southward Bound | 19 | Mare | Final Furlong | View |
| Southern Vein | 11 | Mare | Final Furlong | View |
| Southern Treasure | 22 | Mare | Mayfair | View |
| Southern Sugar | 10 | Mare | Final Furlong | View |