This paper aim to investigate the impact of bank's characteristics, financial struc-ture variables on bank's profitability conventionally referred to as the structure—conduct- performance (S C P) model in the Jordanian commercial banks for the2005—2007 period listed on Amman Stock Exchange. The study used two models that take important variables of the Jordanian commercial banks. These variables bank's characteristics and financial structure variables are extracted from previous studies as well as from banks industry history. The first model Of study variables was divided in two main categories internal variables and external variables related to financial structure indicators to show the impact on banks profitability. The results of run regression show there is a positive and significant relationship between the profitability measures and all internal and external variables in first model but in different years study.
When we the study applied the second model to investigate the relation between egree of concentration in the banking sector and performance it seems that the pre-tax profit indicator is only partly explained by the variables which we considered as relevant. lhe results indicate the positive and significant relationship between the pre-tax profit and the independent variables equity, debt, expenses in every year and in all variables for every year and in whole factors in all years. The study recom— mended encouraging future investigation in the SCP field. This can be undertaken with wider data availability to eliminate or optimally minimize the caveats presented throughout paper, to reduce concentration indicator and spur competition and to boost the development of the equity market in order to improve bank's profitability-as bank and stock market was found to be complementary