In recent years it have seen a significant increase in the number of business mergers and acquisitions. There are number of reasons led to this trend. Amongst them it is the need to increase the firm financial performances. This paper mainly is focuses on other different effects of mergers and acquisitions on the financial performance of businesses. In this study, looking at Turkish stock exchange listed firms that have experienced acquisitions or mergers and the effects of such mergers on their performance. In this context, it be looked at textile firms and firms based on stone and land work that experienced acquisitions in 2010. The firms are Altinyildiz in textile and Çimbeton in the mining sectors respectively. Having look at the financial performances of these firms in their respective sectors before the acquisitions (2007, 2008, 2009), the acquisitionsin 2010, 9 rates were used the in TOPSIS method. According to findings, the acquisitioned firm’s show that they have positive effects on the financial performances of the firms. It is observed that there are differences in sectors’ period and degrees. In this case, it’s possible to explain the sectoral dynamics and acquisions of the firms’ integration.