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In this study the existence of abnormal return and its effective factors were examined. The results show that there is positive short term abnormal return during six month after the acceptance of sampled corporations in exchange. Among seven variable s; Size, Horizon, Coefficient of Variances, Stock Market Return one month  before the offering of stock , Audit Firm  and  Industry Type,  only  Size  (reversely)  and  Stock  Market  Return  (directly) had  a  relation  with  abnormal   return;  however,   multi  variable regression  analyses  demonstrated   that  al l  of  the  variables  can simultaneously justify just around 20% of abnormal return.