We document that institutional investors, and particularly hedge funds, increased their holdings of smaller stocks from 1980 to 2010 and decreased their holdings of larger stocks. As of 1990 institutions began to underweight, relative to market weights, those stocks that make up the largest 40...

The observed predictability in indexes and domestic mutual funds has been attributed to stale prices. Market timing of mutual funds exploits this predictability. We show that there are few stale prices for stocks in the top few deciles of market value and that mutual funds concentrate their...

We investigate whether providers of high frequency media analytics affect the stock market. This question is difficult to answer as the response to news analytics usually cannot be distinguished from the reaction to the news itself. We exploit a unique experiment based on differences in news...