According to the premier register of thoroughbred horses in the U.S., all of the horses are between four and seven generations of Secretariat.

There will be no Triple Crown winner in horse racing this year. Sovereignty, the three-year-old thoroughbred who won the Kentucky Derby on Saturday, will not race in the Preakness Stakes – the second leg of the three races that make up the Triple Crown.

Sovereignty, ridden by Junior Alvarado, left, crosses the finish line to win the 151st running of the Kentucky Derby horse race followed by Journalism, ridden by Umberto Rispoli, at Churchill Downs Saturday, May 3, 2025, in Louisville, Ky. (AP Photo/Abbie Parr) AP