s Q ratio

The main purpose of this research is the study on effect of Financial and Operating Leverage and Venture Capital on Tobin's Q ratio amongst companies listed in Tehran Stock Exchange. In this research, the Holdings and Investment companies are used as statistical samples and 73 enterprises that are listed in Tehran Stock Exchange within 2001 to 2016 have been studied. The results driven by this research show that Venture Capital, hereafter called "VC", and Operating Leverage, hereafter called "OPL", are positively related to Tobin's Q ratio while Financial Leverage, hereafter called "FL", has negative relation. At the same time, combined variables “FL” and “VC” are negatively correlated with Tobin's Q ratio and combined variable “OPL” and “VC” are neutral on Tobin's Q ratio. The effect estimation of independent variables, namely FL, OPL and VC and control variables, over dependent variable of Tobin's Q ratio is 55%, which is in fact noticeable.

This research studies the companies’ effectiveness and performance relationship with stock market liquidity in Tehran Stock Exchange during 2010-2015. Simultaneously, in the study, the three indicators: return on assets, return on investment and Tobin's Q ratio were applied as a measure of the performance and bid-ask spread as a measure of liquidity, bid-ask spread to the stock market. This research has a practical purpose and descriptive correlation in research nature and also post-event research. The under study population comprises all companies accepted in Tehran Stock Exchange during the intended period, 198 companies selected with systematic elimination sampling to be studied and analyzed. The results show a positive and significant association between companies’ performance and Stock market liquidity.