Share repurchase conveys information to investors and influences stock price in capital market. Normally when a company announces share buyback, the company's stock price will rise immediately. Thus, some insiders may take advantage of this pattern and create a fake repurchase event. When the...

We consider simple models of financial markets with regular traders and insiders possessing some extra information hidden in a random variable which is accessible to the regular trader only at the end of the trading interval. The problems we focus on are the calculation of the additional utility...