We examine the changes in acquirers' stock price crash risk following mergers and acquisitions (M&As). We employ the three measures of crash risk most commonly used in the literature: the negative conditional skewness of acquirer-specific stock returns, a down-toup volatility measure, and the excess of extreme negative stock returns over extreme positive returns. We find that stock acquirers experience significantly higher stock price crash risk as compared to cash acquirers. The change in risk is positively correlated with the percent of stock used as a payment method. The findings are confined to acquirers with overvalued stock, lower profitability and more financial constraints, as well as to acquisitions of public targets. We confirm that the financial crisis 2007-2009 period does not drive our findings. Furthermore, our results are robust to endogeneity concerns, controlling for non-acquirers and post-merger acquirer changes.
JEL classification: G14; G34The possible sources of negative skewness following M&A are multiple. First, it could be due to bidder firm managerial hubris leading them to unintentionally overestimate gains from M&A. Second, it could be due to agency conflicts. Parvinen and Tikkanen (2007) examine the sources of incentive asymmetries in M&As. They include the motivations of empire-building managers, dealmakers, investment bankers and M&A consultants, which often lead to the selection of targets that maximize these parties' interests (for instance, managers' compensation) as opposed to shareholders' interests (also see Allen, Jagtiani, Peristiani and Saunders, 2004) 3 . Such agency conflicts often lead managers and their advisers to intentionally overestimate the strategic fit and the gains from their preferred M&A targets.Subsequently, the failure of the expected synergies to materialize increases the bidder's stock price crash risk.Third, to minimize losses associated with unsuccessful M&As, it would be more prudent for an acquirer to fund the M&A deal using stock. Should the deal turn out to be less than successful, the potential losses are shared by both acquirer and target shareholders. As such, a stock acquisition might convey a negative signal about the acquisition's prospects.There exists ample evidence that investors interpret a stock issuance as a sign that the company's managers believe the stock to be overvalued (see Spiess and Affleck-Graves, 1995). This overvaluation is corrected over time through a downward adjustment in the stock price. We therefore hypothesize that a stock bid signals to investors that the acquirer's shares are overvalued and that its management does not share the same level of confidence in the acquisition as in a cash offer. In the long run, following the M&A, these signals add to the bidder's large negative stock returns and stock price crashes.3 In the context of incentives that go beyond shareholder wealth maximization, Lee and Wang (2017) find that having politically connected directors increases crash risk.