Post-acquisition Performance in the Short and Long-run: Evidence from the Copenhagen Stock Exchange 1993-1997

Jan Bo Jakobsen, Torben Voetmann

Publikation: Working paperForskning

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This paper investigates the short-run price adjustment around the acquisition announce-ment and the long-run upward bias of the cross-sectional average buy-and-hold returns. We apply the geometric Brownian motion model to decompose the cross-sectional ave r-age long-run returns into mean components and volatility components. The decomposi-tion is necessary in order to interpret security performance correctly using the measure of wealth relatives. This procedure is useful for any studies of long-run security perform-ance. The most surprising finding is that the long-horizon abnormal return after three years is not significantly different from zero. This implies that the acquiring firms do not under perform significantly compared to the market. That result stands in contrast to findings of other studies, and it may reflect that earlier studies do not adjust for the vola-tility component. This indicates that the market efficiency hypothesis is intact in the long run. It is only in the very short run, i.e. a few days around the acquisition announcements, that the market makes a significant adjustment to uphold the efficiency hypothesis.
UdgiverInstitut for Finansiering, Copenhagen Business School
Antal sider32
ISBN (Trykt)8790705343
StatusUdgivet - 2000
NavnWorking Papers / Department of Finance. Copenhagen Business School


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