[3] Cathryn Sophia's dam Sheave was an unraced daughter of the 2003 American Horse of the Year Mineshaft, and a distant female-line descendant of the 1923 Kentucky Oaks winner Untidy.
Cathryn Sophia began her track career in a six furlong maiden race at Parx on October 30, 2015, and won by twelve and three quarter lengths from eight opponents.
On December 5 she faced better opposition in the Gin Talking Stakes over seven furlongs at Laurel Park and won by more than sixteen lengths from Prognosis.
[6] Cathryn Sophia began her second season at Gulfstream Park on January 30 when she started the 1/10 favorite for the Grade II Forward Gal Stakes over seven furlong.
Ridden by Joel Rosario she started slowly, but took the lead in the stretch and drew away to win by five and a half lengths from Island Saint.
Offered at the 2016 Fasig-Tipton Kentucky November Sale as a racing or broodmare prospect, she sold to Tom Ryan of SF Bloodstock for $1.4 million.