School of Business publications portal
This portal is no longer updated. Aalto University School of Business Master's Theses are now in the Aaltodoc publication archive (Aalto University institutional repository)
School of Business | Department of Finance | Finance | 2016
Thesis number: 14403
The impact of mergers on analysts' forecast accuracy
Author: Honkanen, Emma
Title: The impact of mergers on analysts' forecast accuracy
Year: 2016  Language: eng
Department: Department of Finance
Academic subject: Finance
Index terms: rahoitus; financing; yrityskaupat; corporate acquisitions; tulos; return; ennusteet; forecasts; epƤvarmuus; uncertainty; tieto; knowledge
Pages: 60
Key terms: mergers; financial analyst; analyst forecast; earnings estimate; EPS; forecast accuracy; information environment; information complexity; earnings uncertainty
The purpose of this thesis is to study how mergers affect analysts' ability to predict earnings of the company by comparing pre-merger forecast errors to post-merger errors. In addition to examining the change in forecast accuracy after merger, I also study the permanence of this changed forecast accuracy as well as the factors affecting the change. I also aim to provide new information on how the information environment of the target company affects to forecast accuracy, since this is not studied in previous studies. Finally, I study the possible forecast bias after mergers. I aim to provide updated as well as new information about analyst forecast accuracy after mergers with significantly newer and wider data to help forecast users to assess the possible factors affecting forecast accuracy.

My sample consists of 810 mergers between listed US companies completed in the years 1991-2011. To test the change in the forecast accuracy I compare the forecast error in three post-merger years to forecast errors in the pre-merger years. In addition, I run a multiple regression analysis to find which factors affect the changes in the forecast accuracy.

I find that the accuracy of analyst earnings forecasts decreases significantly after mergers and the forecast accuracy prevails on the decreased level at least three years after the merger. As predicted the information complexity and uncertainty have a negative relation with forecast accuracy in post-merger years. My test shows that, in addition to variables studied in previous research, also target's information environment has a significant effect on analysts' forecast accuracy in the context of mergers. I find that the overprediction is significantly higher in post-merger years, however the explaining component is rather decreased precision than bias.
Master's theses are stored at Learning Centre in Otaniemi.