We study the price effects of firms added to and deleted from the Samp;P 500 index and document an asymmetric price response: there is a permanent increase in the price of added firms but no similar decline for deleted firms. These results are at odds with extant explanations of the effects of...

We study the price effects of firms added to and deleted from the Samp;P 500 index and document an asymmetric price response: there is a permanent increase in the price of added firms but no similar decline for deleted firms. These results are at odds with extant explanations of the effects of...

We study the price effects of changes to the S&P 500 index and document an asymmetric price response: There is a permanent increase in the price of added firms but no permanent decline for deleted firms. These results are at odds with extant explanations of the effects of index changes that...

We find that, due to arbitrage around index changes, investors in Samp;P 500-linked funds lose between 0.03% and 0.12% annually, while investors in Russell 2000-linked funds lose between 1.30% and 1.84%. In dollar terms, the losses range from $3.75 billion to $6 billion a year for the two...

Several studies have found that stock price changes resulting from firms added to the Samp;P 500 index can be best exp lained by a downward sloping demand curve. In this paper, we study price effects around both additions and deletions and find that the price effect of index changes is...

We find that, on average, firms added to the Samp;P 500 index experience a permanent price increase, while those deleted from it suffer only a temporary price decline. Existing theories, such as a downward sloping demand curve, liquidity, and information, fail to explain the asymmetric response....

Because of arbitrage around the time of index changes, investors in funds linked to the Samp;P 500 Index and the Russell 2000 Index lose between $1.0 billion and $2.1 billion a year for the two indices combined. The losses can be higher if benchmarked assets are considered, the...

The use of short sales by mutual funds has increased significantly over the last decade. In this paper, we provide a first look at short selling by mutual funds, a phenomenon not examined by prior research. The mutual funds that use short sales do so frequently and in significant amounts,...