study for my major part 2. The results from this study are as follows: First, equity ratio of major shareholders as well as equity ratio of foreigners has a positive(+) effect on MTB. On the contrary, equity ratio of institutional investors has a negative(-) effect on it. And while equity ratio of major shareholders were not statistically meaningful, equity ratio of foreigners has a positive(+) effect on ROA, but equity ratio of institutional investors as well as its result on MTB has a negative(-) effect on ROA. Second, construction companies managed by employed expert managers have higher value than owner managed companies on MTB. But, there was no statistically significant difference between employed expert manager companies and owner managed companies on ROA. This study suggests that the study of ownership structure on business performance of construction companies needs to be continuously expanded due to the limit information of the sample companies and the lack of its study, considering its large(or huge?) effect to national economy compared with other industries. Thank you. :D