Tail risk is a classic topic in stressed portfolio optimization to treat unprecedented risks, while the traditional mean-variance approach may fail to perform well. This study proposes an innovative semiparametric method consisting of two modeling components: the nonparametric estimation and...

The selection criteria for the traditional momentum strategy do not take into account that the tails of security returns follow a power-law distribution and most of them assign equal weights to the winner and loser portfolios. With the help of fractal theory, we construct a fractal momentum...

We examine the strategies of different types of investors (the insider, the information follower, and the price follower) who have asymmetric information about future news events and how these strategies affect stock prices. We show that stock price jumps occur when the insider receives accurate...

We build a game theoretical model to examine how the level of information advantage of insiders and the competition between insiders and sophisticated investors affect stock price movements and traders' trading strategies and profits. We show that the competition between insiders and...