The number of registered Thoroughbreds for the 5th generation sires on the top sire line pedigree for the registered foals of 2021.
| Sire Name | Registered Thoroughbreds |
|---|---|
| Raise a Native | 3101 |
| Northern Dancer | 2294 |
| Mr. Prospector | 1877 |
| Storm Cat | 1402 |
| Bold Reasoning | 1281 |
| Nearctic | 1279 |
| Fappiano | 1243 |
| Seattle Slew | 1154 |
| Storm Bird | 1102 |
| Native Dancer | 699 |
| Boldnesian | 656 |
| Hail to Reason | 483 |
| Caro (IRE) | 442 |
| Siberian Express | 437 |
| Turn-to | 265 |
| In Reality | 238 |
| Nearco (ITY) | 212 |
| Majestic Light | 149 |
| Vice Regent | 85 |
| Bold Ruler | 81 |
| Cryptoclearance | 63 |
| Minnesota Mac | 62 |
| Intentionally | 39 |
| Polynesian | 31 |
| Relaunch | 28 |
| Fortino II (FR) | 25 |
| Red God | 24 |
| Roberto | 23 |
| Majestic Prince | 21 |
| Tom Fool | 19 |
| Sadler's Wells | 18 |
| Rough'n Tumble | 17 |
| Halo | 16 |
| Grey Sovereign (GB) | 15 |
| Nasrullah | 15 |
| Ribot | 15 |
| Damascus | 14 |
| Armageddon | 13 |
| Milkie | 12 |
| Sword Dancer | 11 |
| His Majesty | 9 |
| Buckpasser | 8 |
| Intent | 6 |
| Blushing Groom (FR) | 5 |
| Nijinsky II | 5 |
| A.P. Indy | 4 |
| Battle Joined | 4 |
| Deer Lodge | 4 |
| Icecapade | 4 |
| Sunglow | 4 |
| What a Pleasure | 4 |
| Danzig | 3 |
| Arts and Letters | 2 |
| Birkhahn (GER) | 2 |
| Deerlands | 2 |
| General (FR) | 2 |
| Hennessy | 2 |
| Afleet | 1 |
| Clever Trick | 1 |
| Cormorant | 1 |
| Gallant Man | 1 |
| Klairon | 1 |
| Nashua | 1 |
| Never Bend | 1 |
| Prince John | 1 |
| Private Account | 1 |
| Runaway Groom | 1 |
| Speak John | 1 |
| Tenerani (ITY) | 1 |
| Unbridled | 1 |
Source: The Jockey Club
Current through 5/17/2024