Browsing by Subject "Implied Volatility"

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    Analyzing the forecast performance of S&P 500 Index Options implied volatility
    (2012) Erdemir, Aytaç
    This study examines the comparative performance of the call and put implied volatility (IV) of at-the-money European-style SPX Index Options on the S&P 500 Price Index as a precursor to the ex-post realized volatility. The results confirm that implied volatility contains valuable information regarding the ex-post realized volatility during the last decade for the S&P 500 market. The empirical findings also indicate that the put implied volatility has a higher forecast performance. Furthermore, from the wavelet estimations it has been concluded that the long-run variation of the implied volatility is consistent and unbiased in explaining the long-run variations of the ex-post realized volatility. Wavelet estimations further reveal that in the long-run put and call implied volatility contain comparable information regarding the realized volatility of the market. However, in the short-run put implied volatility dynamics have better predictive ability.
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    ItemOpen Access
    Determinants of large stock price movements: a perspective from the options market
    (2017-12) Çelik, Duygu
    I empirically investigate the information role of trading volume of call and put options on large stock price movements. I define two variables -crash and jump- to indicate large stock price movements with respect to average return of previous 60- months for each company. Moreover, I use price-based measures and O/S ratio to indicate informed traders in the options market. The sample consists of comprehensive monthly U.S. options and stock market dataset, for 2778 individual firms, which spans the period between 1996 to 2015. I find that volume of put and call options has information about large negative movement in contrast to previous literature both before a jump and a crash. Specifically, before a crash, investors prefer to buy out-of-money put options. Moreover, put volume has a higher predictive power than call volume on crash variable. Before a jump, investors become reluctant to trade in options market. These results document that investors behave asymmetrically before good and bad news.