This paper investigates how heterogeneous sentiments and perspectives expressed in public online media about the abolition of the Chinese presidential term limit in 2018 may have caused a divergence in investor behavior between the U.S. and China. We document that sentiments expressed in social...

We develop statistical methods to detect informed trading in options markets. We apply these methods to 31 companies from various sectors over 14 years analyzing approximately 9.6 million option prices. We find that option informed trading tends to cluster prior to certain events, takes place...

This appendix extends the empirical results in Chesney, Crameri, and Mancini (2011). Informed trading activities on put and call options are analyzed for 19 companies in the banking and insurance sectors from January 1996 to September 2009. Our empirical findings suggest that certain events such...

This article examines trading behavior in the options market conditioned on mispricing in the underlying stock. We investigate the price equilibrium between the observed equity asset and the options-implied synthetic share as well as the relative divergence between the two prices. We find a...

SEBI, the Indian securities market regulator has set a unique example for the entire world by introducing IPO grading in India 2006 on optional basis and further mandating it from May, 2007. The purpose of this grading was to provide retail investors with a ready-made assessment of the...

From 1992 to 2011, average R2 increased from 0.17 to 0.47. During this period, passive financial institutions also grew their ownership from 30 to 50% of the market. Passive investors do not perform fundamental research nor trade around firm-specific news, thus reducing the firm-specific...

Using the next-day and next-week returns of stocks in the Korean market, we examine the association of option volume ratios - i.e. the option-to-stock (O/S) ratio, which is the total volume of put options and call options scaled by total underlying equity volume, and the put-call (P/C) ratio,...

We find that the demand for stock option positions that increase exposure to the underlying is positively related to measures of investor sentiment and past market returns, while the demand for index options is invariant to these factors. These differences in trading patterns are reflected in...