The research is the study of the acquisition of company shares that can affect return (rate of return) of shares and share risk. The object of research is a public company listed on the Index Kompas 100 in 2011-2015 as well as with the financial period 2011-2015. Stock returns are calculated on the percentage change in the stock price closing the year end. Factors suspected to affect stock returns and stock risk in this study is the acquisition of shares made by the company. Data were analyzed using Paired Sample T-Test with SPSS to compare differences in risk and return stock 10 days before to 10 days after the acquisition of shares. The results showed that the acquisition of shares does not give a significant influence on differences in risk and return stock.