The Longines EEF Series is a series of show jumping competitions in the form of a Nations Cup. Competitors compete in teams of four, putting more pressure on the riders than in individual competitions. The final ranking is determined by the sum of the penalty points of the team's three best riders over the two rounds of competition. If there are at least two teams in the lead after two rounds, a jump-off is held. The competing teams each choose a rider who must complete the course without faults and in the shortest possible time.

Coordinated by the European Equestrian Federation, the series aims to help European countries develop their horses and riders. The series is supported by Longines and helmet manufacturer KEP Italia, a safety partner. Teams from across the continent competed in the qualifying round in four regions: Central, Western, Northern, and Southern. After eight qualifying rounds, national teams competed in the series' semifinals, which took place in Deauville, France; Budapest, the Hungarian capital; and Warsaw, Poland. The top ten teams advanced to the grand final, which will be held in Avenches for the next consecutive year.