Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
We examine announcement period abnormal returns to acquirers of listed and unlisted targets in 17 Western European countries over the interval 1996–2001. Acquirers of listed targets earn an insignificant average abnormal return of –0.38%, while acquirers of unlisted targets earn a significant average abnormal return of 1.48%. This listing effect in acquirers' returns persists through time and across countries and remains after controlling for the method of payment for the target, the acquirer's size and Tobin's Q, pre-announcement leakage of information about the transaction, whether the acquisition created a blockholder in the acquirer's ownership structure, whether the acquisition was a cross-border deal, and other variables. The fundamental factors that give rise to this listing effect, which has also been documented in U.S. acquisitions, remain elusive.