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Effects of changes in stock market index composition on stock returns: event study methodology on Zagreb Stock Exchange

Tihana Škrinjarić ()

Croatian Review of Economic, Business and Social Statistics, 2019, vol. 5, issue 1, 43-54

Abstract: This paper observes the short-run effects of stock market index composition changes on stock returns on the Zagreb Stock Exchange (ZSE). In that way, event study methodology is employed in order to estimate abnormal returns and compare them amongst three subsets of stocks: those leaving the market index, those entering it, and constantly included stocks. The research included 14 regular and extraordinary revisions of the market index in the period from January 2nd, 2015 until March 21st, 2018. The results have confirmed two research hypotheses: stock exclusions from the market index have a negative effect on stock returns on the ZSE, which is consistent with the price pressure hypothesis; and there exist asymmetric effects of index composition changes on stock returns. This is the first study of this kind on the Croatian stock market, thus more questions need to be answered in future research.

Keywords: abnormal returns; Croatian stock market; event study; index composition change (search for similar items in EconPapers)
JEL-codes: G12 G14 (search for similar items in EconPapers)
Date: 2019
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Croatian Review of Economic, Business and Social Statistics is currently edited by Dragan Bagić, Ksenija Dumičić and Nataša Erjavec

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