This paper presents evidence of the shareholder wealth effect of institutional activism using its spillovers on non-target companies. The spillovers are instructive because they are a response to an exogenous shock and thus create an environment to conduct a clean event study. In particular, we examine the spillover effects of the first target announcement of the Korea Corporate Governance Fund. As the very first sign of institutional activism in the country, this announcement creates an expectation of similar governance efforts even in non-target companies, especially in those companies whose governance is currently poorer and thus the scope for future activism is greater. Consistent with institutional activism contributing to shareholder wealth, we find that, among non-targets, those firms granting fewer rights to outside shareholders experience a more positive stock price reaction. Further analysis lends additional support to the positive wealth effect of institutional activism.

This paper proposes and tests the hypothesis that takeover vulnerability contributes to short-term price reversal by motivating investors to trade speculatively and also by making investors demand immediacy in their trades. That is, takeover vulnerability is hypothesized to amplify two channels of short-term price reversal, namely, overreaction and price concession. Using several different measures of takeover vulnerability, we find that takeover vulnerability is positively related to price reversal at daily frequencies. We also find that their positive relation is more pronounced when the stock is illiquid or when it is costly to arbitrage, a finding that is consistent with the notion that the observed price reversal is driven by the earlier price concession or overreaction. While unable to determine the exact relative importance between the two channels, we conduct further analysis showing that each channel plays an independent role. Finally, we find no relation between takeover vulnerability and price reversal at the portfolio level, which means that the price reversal observed in individual stock returns is driven by a firm-specific component.