We examine how informed traders trade in the option market around news announcements. We show that their profits depend on whether positions are long or short, whether trades take place before or after news releases, and whether events are scheduled or unscheduled. We predict and find that...

This paper examines how the extent of short-term trading relates to the efficiency of stock prices. We employ a new duration measure based on quarterly institutional investors' portfolio holdings, next to existing proxies such as trading volume, the percentage of transient institutions, and fund...

We analyze the three components of active management (asset allocation, market timing and security selection) in the net performance of U.S. pension funds and relate these to fund size and the liquidity of the investments. On average, the funds in our sample have an annual net alpha of 89 basis...

This paper examines how the extent of short-term trading relates to the efficiency of stock prices. We employ a new duration measure based on quarterly institutional investors' portfolio holdings, next to existing proxies such as trading volume, the percentage of transient institutions, and fund...