[Penelitian ini bertujuan untuk menganalisis pengaruh keputusan merger dan akuisisi terhadap kinerja perusahaan dengan mengevaluasi rasio keuangan mereka. Populasi dalam penelitian ini adalah perusahaan yang melakukan merger dan akuisisi antara 2004- 2007 dan tercatat di Bursa Efek Indonesia (BEI). Dengan teknik purposive sampling, 18 perusahaan dipilih. Uji Kolmogorov-Smirnov dilakukan dan hasilnya menunjukkan bahwa data tidak normal maka uji non-parametrik digunakan. Menggunakan uji Wilcoxon dengan tingkat signifikansi 5%, menunjukkan bahwa seluruh rasio keuangan setelah merger dan akuisisi tidak berubah secara signifikan. Hasil mengarah pada kesimpulan bahwa merger dan akuisisi di Indonesia untuk jangka waktu tersebut tidak signifikan mempengaruhi kinerja perusahaan saat ditunjukkan oleh rasio keuangan ;This research aims to analyze the effect of merger and acquisition decisions on the performance of companies by evaluating their financial ratios. The population in this research are the companies that conducts mergers and acquisitions between 2004- 2007 and are listed in the Indonesian stock exchange (IDX). With a purposive sampling technique, 18 companies are chosen. Kolmogorov-Smirnov test was conducted and results show that data is not normal hence non-parametric test was used. Using Wilcoxon signed rank test with a significance level of 5%, it shows that the entire financial ratios after mergers and acquisitions did not change significantly. The outcome lead to the conclusion that mergers and acquisitions activity in Indonesia for the said time frame does not significantly affect the performance of companies when proxied by financial ratios., This research aims to analyze the effect of merger and acquisition decisions on the performance of companies by evaluating their financial ratios. The population in this research are the companies that conducts mergers and acquisitions between 2004- 2007 and are listed in the Indonesian stock exchange (IDX). With a purposive sampling technique, 18 companies are chosen. Kolmogorov-Smirnov test was conducted and results show that data is not normal hence non-parametric test was used. Using Wilcoxon signed rank test with a significance level of 5%, it shows that the entire financial ratios after mergers and acquisitions did not change significantly. The outcome lead to the conclusion that mergers and acquisitions activity in Indonesia for the said time frame does not significantly affect the performance of companies when proxied by financial ratios.]