Survey Investment Period Influence on Investment Company's Performance in Tehran Stock Exchange (period 1381- 1385)

There is tendency in capital market to appraisal performance of investment company because it is same as appraisal performance of professional investor. Also investment period was being an effective factor on investment decision but how influence this factor investment company’s performance. In current study same as Morningstar Institution methodology if cases have 66 percentage of specific character, they would be in same group, so basis value of long term and short term investment in balance sheet, sample consist two groups, nine investment companies with long term period and five investment companies with short term period. For appraisal performance of investment company base on rate of return and risk, once base on monthly rate of return of investment company’s portfolio and once base on monthly rate of return of investment company’s stock, risk adjusted measures (sharpe, trynor and Jensen) accounted and research hypothesizes with Mann- Whitney U and T- Student tested. Some of data took from Rahavard-e-novin and Tadbirpadaz databases and some of data take from Tehran Stock Exchange site.