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Understanding Information Asymmetry among Investors in Online Trading Environment

  • Journal of The Korea Society of Computer and Information
  • Abbr : JKSCI
  • 2016, 21(1), pp.139~146
  • Publisher : The Korean Society Of Computer And Information
  • Research Area : Engineering > Computer Science

posang lee 1

1송원대학교

Accredited

ABSTRACT

In this paper, we analyze the information asymmetry among investors in online trading environment using rumors which are collected in the Korean stock market for the eleven-year period between January 2004 and December 2014. We find that cumulative abnormal return of sample firms is negative and statistically significant, indicating that a significant fall of the stock price starts before the online disclosure, suggesting that the rumors were reflected in the stock price to a significant extent. Furthermore, individual investors show net purchases on firms prior to disclosure while institutional investors show net sales, showing that individual investors trade unfavorably vis-à-vis institutional investors. This phenomenon is more evident for the KOSDAQ. This result confirms that the information asymmetry exists between individual and institutional investors in online trading environment.

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