Expiration day effects of stock and index futures on the Warsaw Stock Exchange

Milena Suliga () and Tomasz Wójtowicz ()
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Milena Suliga: AGH University of Science and Technology in Krakow, Faculty of Management, Department of Applications of Mathematics in Economics
Tomasz Wójtowicz: AGH University of Science and Technology in Krakow, Faculty of Management, Department of Applications of Mathematics in Economics

Bank i Kredyt, 2019, vol. 50, issue 1, 45-82

Abstract: This paper examines the impact of stock and index futures expirations on the spot market on the Warsaw Stock Exchange. Three of the most commonly-observed effects are analysed, namely increased trading volume of the underlying asset, abnormally high volatility of returns on the expiration day and a price reversal after the expiration. The study confirms that index futures expirations induce increased trading activity of investors, reflected in abnormally high turnover and relative turnover values of stocks from the index. In the case of single stocks, however, all three effects are observed. The reversal of stock prices takes place just after futures expiration and is reflected in the opening prices on the next trading session. Additional analysis performed in sub-periods reveals a significant impact of changes in the short selling rules introduced in May 2015 on expiration day effects.

Keywords: futures market; expiration day effects; stock market; event study (search for similar items in EconPapers)
JEL-codes: C14 C32 (search for similar items in EconPapers)
Date: 2019
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Persistent link: https://EconPapers.repec.org/RePEc:nbp:nbpbik:v:50:y:2019:i:1:p:45-82

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