In this paper, we analyze in quantitative terms the influence of family control on the pattern of corporate investment, using firm-level data from Indonesia, Korea, Malaysia, the Philippines, and Thailand to regress the investment function and focusing on the family ownership structure that characterizes East Asian corporate governance. Our results present evidence that family-controlled firms, the majority of the firms in our data set, face more severe internal financing constraints than nonfamily-controlled firms. Our findings suggest that the mechanism in East Asian countries, which is commonly assumed to permit smooth reallocation of money among investment projects through the internal capital markets of family-controlled group firms, does not work well, and that, coupled with the difficulty of obtaining financing from external capital markets, it may lead to strict internal financing constraints on investment. (C) 2007 Elsevier Inc. All rights reserved.