Gender diversity continues to serve as a thought-provoking and challenging topic for society and business alike. Even as organizations implement policies to minimize discriminatory practices in the workplace, evidence of gender inequality in firms around the world persists. Drawing on institutional theory, this study focuses on the effect that foreign investors and host country corporate social responsibility (CSR) policies have on gender diversity, and how professional groups can moderate this relationship. In analyzing 608 observations from listed firms in Taiwan, the findings demonstrate these relationships. It is shown that both foreign investor ownership and good host country CSR in firms are positively linked to the promotion of women into managerial positions. The assurance of professional groups in home countries further enhances this positive relationship. Our results further indicate how institutions carried across borders by organizations can influence firm decisions such as gender diversity through global norms of corporate CSR and also by the assurance of professional groups in the home multinational firm.