This study investigates how corporate venturing activities, including domestic venturing and international venturing, moderate the links between two types of proactive environmental strategies (PESs)—green management and green political influence—and firm performance. The results obtained by analyzing a multi-informant dataset reveal that green management has a stronger positive impact on firm performance than green political influence does. Moreover, the impact of green management on firm performance is enhanced by international venturing, whereas the insignificant direct effect of green political influence on firm performance becomes positive when domestic venturing is extensive but turns negative when a firm engages in international venturing activities. This study enriches the corporate venturing and PES literatures by offering a more nuanced framework for explaining when distinct types of PESs and corporate venturing activities when combined enhance or hinder firm performance.