Plenty of major breeders in Triple Crown hero's book

According to the most up to date information available from The Jockey Club, other major breeders who race or buy in Europe and who patronised American Pharoah include:

Juddmonte Farms, which sent Soothing Touch, the dam of Grade 1 winner Emollient, and South Bank, a French-raced daughter of Tapit out of European champion Special Duty

Calumet Farm, which sent four mares, including Tapit’s sister Tap of the Day

Runnymede Farm and associates, which bred both Sacre Coeur, dam of multiple Grade 1 winner Lady Eli, and Breeders’ Cup Juvenile Fillies runner-up Beautician to American Pharoah and which purchased Margate Gardens, a half-sister to three stakes winners in foal to the champion, at the Keeneland November sale

Mt Brilliant Farm, whose pair of mares included Dame Marie, a half-sister by Smart Strike to St Leger winner Rule of Law

Stonestreet Farm, co-owner of Cartier Award winner Lady Aurelia, sent Ragtime Hope, dam of Breeders’ Cup Sprint and Dubai Golden Shaheen winner Secret Circle, and Grade 2 winner and stakes producer Belle of Perintown

Friarstown Bloodstock, owned by Bahraini businessman Khalid Abdul Rahim, which bred a pair of mares including Song, the sister to Irish 1,000 Guineas winner Yesterday who was a €1m acquisition from the Paulyn dispersal at Goffs in 2013