Over the last decades, the number of international organizations (IOs) and regional groups (RGs) increased tremendously, and states are now simultaneously members of several RGs and IOs. This article inquiries how states act in settings of complexly nested and overlapping institutions on the regional and international levels. How frequently do states voice regional positions in international negotiations and why are some more active in this respect than others? Why are some RGs more vocal than others? Multiple state memberships in RGs foster the regionalization of international negotiation dynamics via burden-sharing mechanisms. In addition, state capacity and power, the age and policy scope of RGs and the institutional design of IOs also shape negotiation dynamics. This article concludes with reflections on implications of regionalized international negotiations for the efficiency and legitimacy of governance beyond the nation-state.

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