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Listing on the Dow Jones Sustainability Index is seen as a gold-standard,verifying to the market that a firm is fully engaged with a corporate socialresponsibility agenda. Robustly quantifying the impact of listing, andde-listing, against any industry level shocks, as well as evolution in thecompetitive relationship between firms within the industry, provides a strengthabsent in existing works. It is shown that cumulative abnormal returns onstocks added to the index are significantly positive in the three trading weeksprior to the official announcement. The post-listing correction result positedto date is also demonstrated to hold; the proportion of periods withsignificant negative returns is low, however. Announcement, rather thaneffective dates are critical to returns. Differentials between these stages inthe chronology is an important contribution of this paper. Most effects endbefore the membership changes become effective. Whilst there are considerablegains to be made, they come pre-announcement date and require foresight toexploit. Investors must research likely new members to gain maximum return.

Reaction Asymmetries to Social Responsibility Index Recomposition: A Matching Portfolio Approach