Özet:

(The Partnership Concentration on the Companies Operating in Istanbul Stock Exchange and the Effects on the Firms Performance) Consist of concentrated and unconcentrated ownership structures which are depending on distribution of equity between shareholders are formed in company. The ownership structures are expected to have impact on company performance. In order to examine the impacts of differentownership structure on company performance, regression analysis has been used with 113 companies’ data operating in the period 1996-2009 in Istanbul Stock Exchange. In the analysis ROA, ROE and Net Profit Margin have been used as performance variables; concentration, board of directors’ size and the proportion of three major partner’s share have been used as concentration variables. Those have been determined in the analysis results that generally sales size and profit growth have affected all dependent variables positively; leverage, short-term debt ratio, operating risk and sales structure negatively. Moreover, those have been determined that concentration has affected ROA and TobQ; board of directors’ size has affected ROA and TobQ and the three major partner’s share has affected TobQ positively.

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