Based on a study on academic career paths of PhD graduates in Switzerland, this paper is concerned with the individual and institutional factors that affect transnational academic mobility in the postdoctoral period. It will be argued that the institutionalisation of geographic mobility in academic career paths through research funding institutions and universities have gendering and stratifying effects. Complex formations related to gender, partnership, children, and dual-career constellations, as well as to social class and academic integration, are resulting in inequalities in the accumulation of international cultural and social capital. (Contains 1 table.)