Unbridled sired 292 runners that produced 183 winners (38 of those stakes winners) out of 437 foals, earning over $31 million by 2000. Ten of his offspring were Grade I stakes winners, four were classic winners, and three received Eclipse Awards. Unbridled is the last Kentucky Derby winner to sire another Derby winner:
Grindstone, that won the Kentucky Derby in 1996. Unbridled is also the last stallion to have sired at least one winner in each of the American
Triple Crown races (first for each listed): Grindstone, Kentucky Derby, 1996;
Red Bullet, Preakness Stakes, 2000; and
Empire Maker, Belmont Stakes, 2003. Some of Unbridled's other offspring include: •
Colts/Horses: Unbridled's Song, Eddington,
Anees, Unshaded, Saarland, Mustanfar, Symphony Sid, Rebridled, Malabar Gold, Unbridled Jet, Unbridled's Image, Niigon, Greed is Good, Wheelaway, Unrestricted, Broken Vow, Pupil, and Uncoupled. •
Fillies/Mares: Banshee Breeze,
Halfbridled, Exogenous, Santa Catarina, Surya, Lady Ballade, Happily Unbridled, Boom Town Girl, Unrestrained,
Manistique, and Belterra. Unbridled was grandsire through Unbridled's Song of the filly
Eight Belles, who finished second at the
2008 Kentucky Derby but broke both front
pasterns at the finish and was euthanized on the track, and of the colt
Arrogate, who won the
2016 Breeders' Cup Classic and placed first in the
World's Best Racehorse Rankings for that year. By his daughter Oatsee, he was also the broodmare sire of
Shackleford, winner of the
2011 Preakness Stakes. One of Grindstone's foals,
Birdstone, upset
Smarty Jones to win the 2004 Belmont Stakes. Birdstone, in turn, sired
Mine That Bird, a gelding that won the
2009 Kentucky Derby, and
Summer Bird, a colt that won the
2009 Belmont Stakes. Empire Maker, which won the
2003 Belmont Stakes, sired
Pioneerof the Nile, who placed behind his cousin Mine That Bird in the 2009 Kentucky Derby, and eventually sired
American Pharoah, the first-ever winner of the
Grand Slam of Thoroughbred racing in 2015. American Pharoah gave Unbridled the honour of four generations of Triple Crown race winners. == Death ==