This paper exploits a novel hand-collected data set to provide a comprehensive analysis of the social relationships that underlie illegal insider trading networks. I find that inside information flows through strong social ties based on family, friends, and geographic proximity. On average, inside tips originate from corporate executives and reach buy-side investors after three links in the network. Inside traders earn prodigious returns of 35% over 21 days, with more central traders earning greater returns, as information conveyed through social networks improves price efficiency. More broadly, this paper provides some of the only direct evidence of person-to-person communication among investors.

In contrast to the widely held belief that targets capture the lion's share of merger gains, I show that the average dollar gains to targets are only modestly more than the dollar gains to acquirers. To help explain the variation in merger outcomes, I present empirical evidence in support of a new hypothesis that a target's relative scarcity (proxied by its market power) and product market dependence (proxied by customer–supplier relations) help to explain its share of the total merger gains. These results provide new evidence for an unexplored role of product markets on bargaining outcomes in mergers.

We find strong evidence that three key dimensions of national culture (trust, hierarchy, and individualism) affect merger volume and synergy gains. The volume of cross-border mergers is lower when countries are more culturally distant. In addition, greater cultural distance in trust and individualism leads to lower combined announcement returns. These findings are robust to year and country-level fixed effects, time-varying country-pair and deal-level variables, as well as instrumental variables for cultural differences based on genetic and somatic differences. The results are the first large-scale evidence that cultural differences have substantial impacts on multiple aspects of cross-border mergers.