This article examines the value-added phenomenon of Malaysian horizontal merger and acquisition activities (M&A) in the long run for the period 1994–2010. In this regard, this article used economic value-added (EVA) approach and cost-efficiency approach (stochastic frontier analysis (SFA)) to investigate synergistic benefits. The findings suggest that bidder firms experience no significant improvement in operating and financial efficiencies in the long run. Specifically, the operating performance of bidder firms deteriorated after the merger exercise, whereas the target firms had no significant improvement in operating performance over the same period. In summary, the findings suggest no synergistic gains from horizontal mergers in Malaysia. These findings imply that the long-run performance of firms in the horizontal mergers or acquisitions is driven by other motives rather than synergistic gains.

This paper aims to examine the productivity and spillover effect of Malaysian horizontal merger and acquisition (M&A) activities in the long run. In terms of analytical tools, economic value added (EVA) and data envelopment analysis (DEA) are used. The results of this study reveal that M&As in the absence of antitrust laws could be driven by managerial self-interest to create market power instead of realizing synergistic gains. Also, in Malaysia, the non-merging rival firms have significantly higher productivity improvement than the control bidder firms, and therefore, this study has identified the spillover effect as a behavior of M&A reaction. This paper differs from previous studies in that it attempts not only to examine the real long-term gains of horizontal M&A activities in Malaysia but also the spillover effects of M&A activities on similar but non-merging firms.