Joop Aaldering has been owner of famous Grand Prix horses as Arko III, Quick Study, Coupe de Coeur, Simon, Untouchable and Hors la Loi II. For more than 30 years every time he finds new quality show jumpers with the potential to become a top horse. All the show jumpers are co-owned by Kyra Swelheim.
The stallions F-One USA, Untouched and Cash du Plessis are sold to Nick Skelton's sponsor but still available for breeding via Joop Aaldering.