All three finished on their dressage scores, having added no jumping or time penalties in either jumping phases.
The junior rider championship went to Kate Herdson riding Eon, improving from second after the dressage and showjumping phases in the one-star class to take the title with a clear crosscountry round incurring 3.6 time penalties.
The win moves her into second place in the PGG Wrightson Junior Rider series, behind South Islander Lucy Turner and Carbon.
Alindi Jordaan was second on the experienced Eskimo Joe, improving from eighth place after the dressage with no further penalties added from either jumping phase.
Beth Wilson, on Alto et Audax, Fenella Carter, on Absolou, and Amalia Rowley on Mexico II were the other Junior Riders to place in this class.