The strategies, decisions and beliefs of those who occupy prominent positions of economic power have influence on very large corporations and the markets they dominate, on vast amounts of economic resources, and on the rules of the game. However, the sociology of elites faces a dual challenge: divergent conceptualisations of what can be considered as a position of economic power and internationally incompatible sources of information hinder comparative analysis. The World Elite Database (WED) addresses this dual challenge, by generating, based on a consistent definition, standardised data for 16 countries. This research note introduces WED, its construction principles, and presents preliminary findings on how economic elites differ across countries.