Suchi Mishra

Changes in the Information Efficiency of Stock Prices: Additional Evidence

Previous research shows, using data from three quarters after the implementation of regulation fair disclosure (Reg FD), that there is an improvement in the informational efficiency of stock prices after Reg FD. We compare the informational efficiency of stock prices in four pre-Reg FD quarters (1999–2000) and 12 post-Reg FD quarters (2002–2005). The improvement in the informational efficiency of stock prices previously reported in the immediate aftermath of Reg FD persists in later periods.

The Effect of High Frequency Market Making on Option Market Liquidity

The transition from manual to electronic markets in options paved the way for pricing efficiencies and improved liquidity from options high-frequency market making (HFMM). We find that HFMM reduces option bid–ask spreads, although with differences across both option and firm characteristics. Depth increases with the number of market maker quote revisions, conflicting with extant high-frequency research in other markets. The largest absolute change for spreads (depth) is for mid-size (large) companies. However, the change to penny quotes for options caused HFMM to have less of an effect on both spreads and depth, showing that penny quoting exacerbates the pricing efficiency generated by more frequent quote revisions.

Skewness Preference and Measurement of Abnormal Returns: A Comparative Evaluation of Current vs Proposed Event Study Paradigm

This study investigates the implications of recognizing skewness preference in the computation of abnormal returns. Replicating the Fama, Fisher, Jensen and Roll study on stock split on a recent data set with a few distinct event study techniques, this study finds that recognition of skewness preference as defined by Kraus and Litzenberger (1976) in the computation of the abnormal returns significantly changes the results in comparison to the results that have been obtained without recognizing skewness.