In this presence era of developing economy, in india merger and acquisitions are become widely preferable strategies to remain stable or to achieve core competency in the market. Where two companies are working together by putting joint efforts with a view to achieving their strategic objectives. This study helps to analyse the impact of mergers and acquisitions on the financial performance of the selected Indian companies whether the merger or acquisition is able to generate positive impact or to generate negative impact on the financial performance of the selected Indian companies. With the use of various variables like; Current market price, Earning per share, Net Profit, Earning Before Interest And Tax, Share Holder's Equity, capital employed, long term debt, total assets, total liabilities, P/E Ratio, Return on Assets, Return on Equity, Return on capital employed, return on net worth, Profit Before Interest And Tax the present study have try to analyse the impact of mergers and acquisitions on the financial performance of the selected Indian companies. To complete this study four major Indian companies have been selected and after the analysis it has been revealed that the merger of HDFC Bank have not affect the financial performance of HDFC Bank and the acquisition of axis bank also have shows the same but the acquisition of Kotak Mahindra bank has shown kind of mixed impact on the financial performance of the Kotak Mahindra bank and the acquisition of Infosys ltd. has also shown the impact of acquisition on the financial performance of Infosys ltd.