The purpose of this research is to find out the difference of financial performance of the acquirer which is measured by using current ratio(CR), total asset turn over(TATO), debt to asset ratio(DAR), return on asset(ROA) and earning per share(EPS) before and after merger acquisition. The research is comparative research and the object of this research is companies which are listed in Indonesia Stock Exchange in 2010-2016. The sample collection technique has been done using by purposive sampling, so 34 companies which has carried out the acquisition and merger activities in 2013 period based on the supervision of the business Competition Supervisory Commision have been selected as samples. The data analysis technique has been done by Wilcoxon Signed Ranks Test. Based on the result of the analysis which has been carried out by using Wilcoxon Signed Ranks Test that 3 financial ratios have significant difference is activity ratio(TATO), profitability ratio(ROA) and market ratio(EPS) that are 2 financial ratios which do not have any significant difference is laverage ratio(DAR), and liquidity ratio(CR).