Calumet Farm
The farm's breeding success was notably anchored by a part ownership in Blenheim, a stallion imported from England, and its foundation sire, Bull Lea. Calumet Farm has produced eight Kentucky Derby winners, more than any other operation in U.S. racing history. As well, Calumet Farm is both the leading breeder and owner of Preakness Stakes winners with seven each. From the farm's many great foals, two colts also won the U.S. Triple Crown and three females won the Triple Crown for fillies.