We investigate the cross-country key factors of profit reinvestment decisions using data compiled by the World Bank from over 7,000 businesses in 36 developing countries. We find that, compared to the security of property rights, it is a firm's access to external financing that plays an important role in a firm's reinvestment decision in emerging economies. The extent of private ownership and the firm's competitiveness are additional significant factors correlated with its reinvestment decision. Furthermore, we uncover a firm size effect in that the above factors driving firm reinvestment decisions appears to impact small firms more than relatively larger firms.