Η απόδοση των αγοραστριών εταιριών στις οριζόντιες συγχωνεύσεις και εξαγορές (Σ&Ε) σε σχέση με αυτήν στις κάθετες Σ&Ε στην αγορά των ΗΠΑ κατά την τελευταία 10ετια (2012-2022)
The performance of acquirers in horizontal versus vertical M&As in the US market over the period 2012-2022

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Keywords
Συγχωνεύσεις ; Εξαγορές ; Κάθετη ολοκλήρωση ; Οριζόντια ολοκλήρωση ; Ανάλυση γεγονότων ; Μη κανονικές αποδόσεις ; Βραχυχρόνια περίοδος ; Υπόδειγμα δείκτη της αγοράςAbstract
This Master’s thesis presents one of the most important corporate events that a company can undertake in its business life which is Mergers and Acquisi-tions (M&As). In this study we analyzed a sample of 876 deals that took place in the U.S. during the decade 2012-2023. The main topic of examination of the paper was the difference in the abnormal returns of acquirers upon the short-term announcement period of takeover bids based on the type of inte-gration they choose to follow, i.e. vertical and horizontal integration. The ab-normal returns were produced by the Market Index model. We discovered that in general acquirers over the aforementioned decade experience positive abnormal returns on all 3 event windows we chose to analyze. Furthermore, univariate analysis documented that vertical M&As overperform the horizon-tal deals by a difference of about 2.82% which is statistically significant. This result was vindicated in the model of multiple regression analysis by which the relation between the cumulative abnormal returns (CARs) of acquirers and the horizontal type of M&As continued to be negative and statistically signifi-cant.