Leading Broodmare Sires of 2021 Grade I Stakes Winners
(through 31 December 2021)
| Rank | Stallion | Sire | SWs |
| 1 | DANEHILL DANCER | DANEHILL | 5 |
| 2 | GALILEO | SADLER'S WELLS | 4 |
| 3 | A.P. INDY | SEATTLE SLEW | 3 |
| ANABAA | DANZIG | 3 | |
| BERNARDINI | A.P. INDY | 3 | |
| EMPIRE MAKER | UNBRIDLED | 3 | |
| JOHANNESBURG | HENNESSY | 3 | |
| STORM CAT | STORM BIRD | 3 | |
| TAPIT | PULPIT | 3 | |
| UNBRIDLED'S SONG | UNBRIDLED | 3 | |