This study focused on investigating institutional ownership's impacts on financial sector firms' market performance. The research involved data selected from 12 financial sector companies in the US market. The data was gathered from official government websites and some database sites. This study finding release that institutional ownership structure had an important and significant effect on the selected companies' market performance. The aim is to discover the importance of institutional ownership structure on firms' ownership profile.

Keywords : Institutional ownership, Firm market-based performance, Tobin’s Q.