This study examines the influence of three informal institutions, performance orientation, self-expression and social desirability, on the extent of internationalization by early stage entrepreneurial firms. We employed multi-level modeling techniques using 20,656 individual-level responses obtained from the Global Entrepreneurship Monitor (GEM) survey for 39 countries from 2001 to 2008, and supplementing with country-level data obtained from the World Values Survey (WVS) and the Global Leadership and Organizational Behavior Effectiveness (GLOBE) study. The results demonstrate that high performance orientation, high self-expression, and low social desirability of entrepreneurship in societies increase the extent of internationalization by early-stage entrepreneurial firms. The study promotes new theory and empirical findings on the relationship between informal institutions and entrepreneurial agency. (C) 2016 Elsevier Ltd. All rights reserved.