This research aims to examine the relationship between Islamic banks' profitability and shareholders' value with the market structures, ownership structures, and financial risk factors, and to test for any differences in these performances between the Islamic and conventional banks. The impacts of both market and ownership structures and financial risks of banking performance is recognized globally and critical for the banking industry. The market and ownership structures are considered pertinent as they indicate competitive environment in which banks can lower costs, extend access to finance, and build effectiveness while garnering impacts of the financial risks will promote financial stability. In addressing the research questions and research objectives this study utilized balanced panel data of a sample of 60 commercial banks out of which, 17 are Islamic banks from the GCC countries during 2003-2015 periods. Four models were formula ted and estimated for each performance indicator using the PCSEs technique based on the results of diagnostic tests ...