With its growing popularity in the international arena of structure studies, the pair-copula method is used to analyze the social benefits arising from recent expansion of state-owned enterprises under the “expanding domestic demand” background. An empirical analysis was conducted with the financial data of top 100 state-owned listed companies during 2002-2013. The results show that, state-owned companies have been witnessing profound expansion since the release of the Ten Actions for Expanding Domestic Demand and Promoting Economic Growth promulgated by the State Council in November 2008. Monopoly expansion is not significantly correlated with financial performance but retains a significant positive correlation with social benefits. This indicates that monopoly expansion does not necessarily contribute to better financial performance but spurs state-owned enterprises to assume more social responsibilities.