<p>This article examines how early internationalizing firms (EIFs) navigate the transition from entry to the post-entry phase of internationalization, a critical yet understudied stage. Grounded in resource-based theory, the study explores how strategic resources evolve and interact over time to support sustained international growth. Drawing on a longitudinal multiple case study of five French EIFs, the findings reveal alternating phases of expansion and contraction—punctuated by distinct inflection points—that shape firms’ international processes. Two key factors emerge as central: entrepreneurs’ pivotal role as dynamic orchestrators in mobilizing and reconfiguring resources, and the synergistic combination of resources that enables firms to overcome long-term challenges. The study further identifies three distinct resource configurations that differentially shape firms’ capacity to sustain internationalization through the transition period. By highlighting these dynamics, the study contributes to the international entrepreneurship literature by extending resource-based perspectives on the temporal dimension of internationalization.</p>