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Co-Movement of Indonesian State-Owned Enterprise Stocks

Author

Listed:
  • Apriani Dorkas Rambu Atahau

    (Department of Management, Satya Wacana Christian University, 52-60 Diponegoro Rd., Salatiga City 50711, Indonesia)

  • Robiyanto Robiyanto

    (Department of Management, Satya Wacana Christian University, 52-60 Diponegoro Rd., Salatiga City 50711, Indonesia)

  • Andrian Dolfriandra Huruta

    (Department of Economics, Satya Wacana Christian University, 52-60 Diponegoro Rd., Salatiga City 50711, Indonesia)

Abstract

According to portfolio theory, diversifying investment to several stocks with negative correlations may reduce portfolio risk. In contrast, combining stocks with similar movement (co-movement) has no impact on portfolio risk reduction. This study aims to examine state-owned enterprise stock co-movement in Indonesia using orthogonal generalized auto-regressive conditional heteroscedasticity (O-GARCH) to help investors selectively choose stocks in a portfolio to reduce portfolio risks. Saturation sampling was used since all state-owned enterprise stocks listed on the Indonesian Stock Exchange were selected as samples. Based on monthly data from January 2013 to December 2021, the O-GARCH method was able to simplify the covariance matrix of the 17 SOEs. Of 17 SOEs, 11 had co-movement, as indicated by their similar principal components, whereas the remaining 6 stocks had a different principal component. Hence, investment managers or investors should not put the eleven stocks in the same portfolio as they have similar risk factors; instead, they may combine them with the six remaining SOE stocks which have a different co-movement. In addition, when the fiscal deficit is high and unconventional monetary policy is implemented in a crisis period, the SOE stock co-movement is higher. Thus, the SOE stock co-movement also depends on government-related matters and faces slightly different risks compared to its private-sector counterparts. Hence, the regulators formulating the policy on SOE stock holdings may use the results of this study by considering the potential merging of the SOE stocks with a similar stock return co-movement by taking account the timing in relation to fiscal deficit and crisis period.

Suggested Citation

  • Apriani Dorkas Rambu Atahau & Robiyanto Robiyanto & Andrian Dolfriandra Huruta, 2023. "Co-Movement of Indonesian State-Owned Enterprise Stocks," Economies, MDPI, vol. 11(2), pages 1-24, February.
    • Handle: RePEc:gam:jecomi:v:11:y:2023:i:2:p:46-:d:1054615
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    References listed on IDEAS

    as
    1. Koulakiotis, Athanasios & Kartalis, Nikos & Lyroudi, Katerina & Papasyriopoulos, Nicholas, 2012. "Asymmetric and threshold effects on comovements among Germanic cross-listed equities," International Review of Economics & Finance, Elsevier, vol. 24(C), pages 327-342.
    2. Apriani Dorkas Rambu Atahau & Robiyanto Robiyanto & Andrian Dolfriandra Huruta, 2022. "Predicting Co-Movement of Banking Stocks Using Orthogonal GARCH," Risks, MDPI, vol. 10(8), pages 1-13, August.
    3. Arindam Bandyopadhyay & Sonali Ganguly, 2012. "Empirical estimation of default and asset correlation of large corporates and banks in India," Journal of Risk Finance, Emerald Group Publishing, vol. 14(1), pages 87-99, December.
    4. Priyank Gandhi & Hanno Lustig & Alberto Plazzi, 2020. "Equity Is Cheap for Large Financial Institutions," The Review of Financial Studies, Society for Financial Studies, vol. 33(9), pages 4231-4271.
    5. Fama, Eugene F, 1970. "Efficient Capital Markets: A Review of Theory and Empirical Work," Journal of Finance, American Finance Association, vol. 25(2), pages 383-417, May.
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