Unlike political parties in many other countries, Swedish ones have not adopted more inclusive methods for choosing their election candidates and party leaders. While the party congress formally selects important party offices, the process is managed, prior to the formal vote, by a selection committee vested with the task of filtering the pool of potential leaders and proposing one of them as the new leader. In this article, we survey the composition of these selection committees over time to investigate the extent to which change has taken place. Specifically, we investigate whether the composition of these powerful committees, which decide who joins the ranks of the country's political leaders, has developed over time in relation to what prominent theories of intra-party power might lead us to expect. We derive testable expectations from prominent conceptualisations of intra-party power and apply these empirically. Specifically, we study the composition of party selection committees in Sweden over 50 years, 1969-2019. In total, this includes 40 different selection committees and almost 400 individuals. Contrary to conventional wisdom on intra-party power relations, the empirical analysis reveals a surprising degree of stability, raising questions about common claims of general power shifts within parties.