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Measuring Information Asymmetry in Large Active Firms on the Tehran Stock Exchange


  • Shamsoddini Mostafa

    () (Faculty of Management and Economics, University of Sistan and Baluchestan, Iran (Islamic Republic of))

  • Shahiki Tash Mohammad N.

    () (Faculty of Management and Economics, University of Sistan and Baluchestan, Iran (Islamic Republic of))

  • Khodadad-Kashi Farhad

    () (Payame Noor University, Iran (Islamic Republic of))


In financial markets, transparency of financial information is one of the most effective variables of investment strategies. Information asymmetry can seriously affect firm performance on the stock exchange and firms with a poor informational environment can lose the interest of investors. Reducing information asymmetry can have an important effect on firm performance on the stock exchange. Firms may lack a clear informational environment in the market because of the emerging conditions governing the Tehran Stock Exchange. Because larger and more active firms on the Tehran Stock Exchange provide more information, measuring the informational environment of these firms provides an overview of information asymmetry. The present study calculated the information asymmetry in these firms using the PIN and FE indices. The inconsistent results provided by these indices prompted the authors to offer a new index that is a composite of the PIN and FE that can better explain information asymmetry in developing market such as Asian stock markets. The results show that the new composite index, by using the mechanisms of the PIN and FE indices, provides a better outcome. The new composite index shows that the Tosee Melli Inv (TMEL1), Mobarakeh Steel (FOLD1), Iran Mobil Tele (HMRZ1), Saipa (SIPA1) and I.N.C. Ind. (MSMI1) firms have a better informational environment on the Tehran Stock Exchange.

Suggested Citation

  • Shamsoddini Mostafa & Shahiki Tash Mohammad N. & Khodadad-Kashi Farhad, 2016. "Measuring Information Asymmetry in Large Active Firms on the Tehran Stock Exchange," Scientific Annals of Economics and Business, Sciendo, vol. 63(3), pages 333-346, November.
  • Handle: RePEc:vrs:aicuec:v:63:y:2016:i:3:p:333-346:n:4

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    References listed on IDEAS

    1. Easley, David & O'Hara, Maureen & Saar, Gideon, 2001. "How Stock Splits Affect Trading: A Microstructure Approach," Journal of Financial and Quantitative Analysis, Cambridge University Press, vol. 36(01), pages 25-51, March.
    2. Christie, Andrew A., 1987. "On cross-sectional analysis in accounting research," Journal of Accounting and Economics, Elsevier, vol. 9(3), pages 231-258, December.
    3. Brockman, Paul & Yan, Xuemin (Sterling), 2009. "Block ownership and firm-specific information," Journal of Banking & Finance, Elsevier, vol. 33(2), pages 308-316, February.
    4. Berry, Steven & Levinsohn, James & Pakes, Ariel, 1995. "Automobile Prices in Market Equilibrium," Econometrica, Econometric Society, vol. 63(4), pages 841-890, July.
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    More about this item


    Information asymmetry; Tehran Stock Exchange; Composite index; PIN; FE;

    JEL classification:

    • D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information; Mechanism Design
    • D83 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Search; Learning; Information and Knowledge; Communication; Belief; Unawareness


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