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The effects of information disclosure regulation on stock markets: Evidence from Vietnam

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  • Hoang, Trang Cam
  • Pham, Huy
  • Ramiah, Vikash
  • Moosa, Imad
  • Le, Danh Vinh

Abstract

This paper investigates the effects of regulation pertaining to information disclosure on the Vietnam stock market. Using the event study methodology, we examine sectoral reactions, in terms of risk and return, following the announcements on information disclosure regulation in Vietnam. To validate the results, we also conduct several robustness tests such as the removal of firm-specific information and the use of a wide variety of ARCH models such as GARCH (1,1). We find evidence indicating that when the market anticipates a piece of regulation on information disclosure, most sectors experience negative reactions two and five days before the first announcement. Positive reactions are observed on the event date, as well as two and five days afterwards. Furthermore, we document a difference between the Ho Chi Minh Stock Exchange (HOSE) and the Hanoi Stock Exchange (HNX) in terms of market reaction. The results also show that the sectors experience changes in short-term systematic risk. Our contributions to the literature are threefold. First, we focus on a complete and more updated set of the Vietnam stock market’s information disclosure regulation. Second, our study examines the effects of a series of events on a single regulation at sectoral and firm levels in an emerging market. Third, in addition to sectoral analysis, we analyse the Vietnam stock market reaction at the firm level.

Suggested Citation

  • Hoang, Trang Cam & Pham, Huy & Ramiah, Vikash & Moosa, Imad & Le, Danh Vinh, 2020. "The effects of information disclosure regulation on stock markets: Evidence from Vietnam," Research in International Business and Finance, Elsevier, vol. 51(C).
    • Handle: RePEc:eee:riibaf:v:51:y:2020:i:c:s027553191930515x
    DOI: 10.1016/j.ribaf.2019.101082
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    Cited by:

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    2. Tanveer, Zubair, 2021. "Event Analysis of the COVID-19: Evidence from the Stock Markets of Twenty Highly Infected Countries," Jurnal Ekonomi Malaysia, Faculty of Economics and Business, Universiti Kebangsaan Malaysia, vol. 55(1), pages 3-25.
    3. SOSA-CASTRO, Miriam, 2022. "Equity Market Volatility Impact On S&P 500 Sector Indexes, 1989-2021," Applied Econometrics and International Development, Euro-American Association of Economic Development, vol. 22(1), pages 39-60.
    4. Wang, Qian & Su, Zhongnan & Chen, Xinyang, 2021. "Information disclosure and the default risk of online peer-to-peer lending platform," Finance Research Letters, Elsevier, vol. 38(C).

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    More about this item

    Keywords

    Information disclosure; Sectoral reaction; Abnormal returns; Market anticipation; Systematic risk;
    All these keywords.

    JEL classification:

    • G10 - Financial Economics - - General Financial Markets - - - General (includes Measurement and Data)
    • G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies; Insider Trading
    • G18 - Financial Economics - - General Financial Markets - - - Government Policy and Regulation

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