Abstract
Largely constant average acquirer returns over the past four decades mask fundamental changes in the takeover market. Controlling for bidder composition, the common component of acquirer returns has increased by five percentage points relative to the 1980s. Offsetting this increase, the average bidder-specific component has declined. We propose a theory of bidder-specific synergies to help interpret these opposing trends. In our theory and in the data, acquirer returns increase with the extent to which synergies are unique to that bidder. The composition effect reflects bidder uniqueness. Overall, the evidence is consistent with rising merger synergies that have become less bidder specific. This paper was accepted by Victoria Ivashina, finance. Funding: A. Golubov acknowledges financial support from the Bank of Canada [Governor’s Award]. Supplemental Material: The online appendix and data files are available at https://doi.org/10.1287/mnsc.2022.02208 .
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