In this paper, post-issue operating performance of family and non-family owned firms following seasoned equity offerings in Thailand during 2007 to 2010 is discussed as a primary aspect. Like in the other developing countries, Thailand’s economy is composed with individual, family, and partners owned firms, the difference in ownership structure can cause different levels of agency conflicts and information asymmetry. Previous studies proposed that, despite of the differences in ownership structure, family businesses tend to have a different mindset of financial logic, behavior in managing firms’ capital, set of objectives, and management style. Managing the obtained capital from the investors are also one approach of firms’ financial management, and therefore, this research finds insight understanding of difference in family versus non-family firms in managing the seasoned equity offerings. The result of this study finds supporting conclusion to the previous studies on negative impact of the seasoned equity offerings. It is also found that certain types of family firms tend to outperform the other firms in the SET market. Finally, family firms that announce SEOs generally outperform the other SEO firms as well.

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