چکیده (انگلیسی):

One of the main goals of privatization in different countries is to improve the performance and efficiency.
Therefore, this study titled “Privatization effects on stock return and performance of listed companies Tehran Stock
Exchange" is written as experimental. The purpose of this research is to measure the success of the companies
subject to privatization and in case of failure, find reasons and solutions for it. Researcher, According to the literature
related to privatization and theoretical foundations related to the performance and stock return, research`s
hypotheses in order to test presented on 10 hypotheses. Research Methodology is from the type Inductive-deductive.
Financial information is collected, by using Computational models and statistical techniques, hypotheses have been
tested. Statistical population includes Companies that from 2004 -2010 on the implementation of the privatization
policy have been transferred and at the end of 2012 has been a member of the Stock Exchange. According to the
length of time, ownership of 19 companies private has been diagnosed and as population was investigated. The
results show that, privatization did not affect improving performance of companies which transferred to the private
sector. In other words, the research hypotheses based on improving the performance of companies after the
transferring have been rejected.