This paper examines the implications of China’s rapid integration into global production networks for export performance of countries in Southeast Asia. In a clear departure from the conventional practice, the trade flow analysis of the paper is based on a careful disaggregation of reported trade data into components and final goods, with a view to delineating supply-side complementarities arising from cross-border production fragmentation. There is clear evidence that network-related trade in components has strengthened Southeast Asia’s trade links with China, opening up new opportunities for the expansion of component production/assembly writhing vertically integrated global industries. However, these trade links with China have not lessened the dependence of growth dynamism of these countries on the global economy; the dynamism of regional cross-border production networks depends inexorably on China’s trade in final goods with North America and the European Union.