The experiments of the ninth international cycle were conducted by 11 governmental research institutions or private companies from 9 countries covering the main sunflower cropping area in Europe and North America. A great variation with respect to the environmental adaptability, genetic yield potential, and oil content was registered in the ninth biennial cycle of international trials with sunflower hybrids. An important group of hybrids exhibited a satisfactory stability over a multitude of locations in both experimental years, while certain hybrids were better differentiated only within limited areas. A good behaviour was shown by the hybrids HOGGAR, P-6541 PIONN, SANKARA, and HU-GKI-43.