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Information content of sustainability index recomposition: A synthetic portfolio approach

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  • Rudkin, Wanling
  • Cai, Charlie X.

Abstract

A firm’s inclusion on the Dow Jones Sustainability Index (DJSI) signals its leadership in Environmental, Social, and Governance (ESG). We studied the effects of DJSI inclusion using data through 2021. For additions, we found significant positive pre-announcement effects, as well as persistence of positive abnormal returns. On deletions, we also saw positive abnormal returns, although significance reduced in later years. Our analysis demonstrated a stronger information role of DJSI inclusion for non-S&P 500 firms, which suggests that the DJSI is relatively more important for firms with lower investor recognition. We used a generalised synthetic control approach to estimate our results, which responds to the parallel trends critique of stock return event studies and provides robustness to industry shocks that are so important to ESG applications. Thus, this paper represents an important extension to our understanding of the value relevance of DJSI membership.

Suggested Citation

  • Rudkin, Wanling & Cai, Charlie X., 2023. "Information content of sustainability index recomposition: A synthetic portfolio approach," International Review of Financial Analysis, Elsevier, vol. 88(C).
    • Handle: RePEc:eee:finana:v:88:y:2023:i:c:s1057521923001928
    DOI: 10.1016/j.irfa.2023.102676
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    More about this item

    Keywords

    Sustainability index inclusion; ESG; Synthetic control; Financial event study;
    All these keywords.

    JEL classification:

    • C58 - Mathematical and Quantitative Methods - - Econometric Modeling - - - Financial Econometrics
    • G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies; Insider Trading
    • G32 - Financial Economics - - Corporate Finance and Governance - - - Financing Policy; Financial Risk and Risk Management; Capital and Ownership Structure; Value of Firms; Goodwill
    • M14 - Business Administration and Business Economics; Marketing; Accounting; Personnel Economics - - Business Administration - - - Corporate Culture; Diversity; Social Responsibility

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