Leading Broodmare Sires of 2020 Grade I Stakes Winners
(through 31 December 2020)
| Rank | Stallion | Sire | SWs |
| 1 | GALILEO | SADLER'S WELLS | 5 |
| SADLER'S WELLS | NORTHERN DANCER | 5 | |
| 3 | DANEHILL | DANZIG | 4 |
| DANEHILL DANCER | DANEHILL | 4 | |
| DANSILI | DANEHILL | 4 | |
| PIVOTAL | POLAR FALCON | 4 | |
| 7 | A.P. INDY | SEATTLE SLEW | 3 |
| CAPE CROSS | GREEN DESERT | 3 | |
| FORESTRY | STORM CAT | 3 | |
| TAPIT | PULPIT | 3 | |
| UNBRIDLED'S SONG | UNBRIDLED | 3 | |