The liquidity effects associated with addition of a stock to the S&P 500 index: evidence from bid/ask spreads

The liquidity effects associated with addition of a stock to the S&P 500 index: evidence from... This study examines changes in stock liquidity, as measured by the bid/ask spread, when a stock is added to the S&P 500 Index. The paper presents evidence of a significant decrease in the bid/ask spread upon S&P 500 addition, however, this effect is limited to only those stocks that were not trading listed options. Further, the decrease in the bid/ask spread for nonoptioned stocks is accompanied by a significant and permanent increase in share price and trading volume. While optioned stocks experience a permanent increase in trading volume, they experience only a temporary increase in share price. The findings for optioned stocks support the hypothesis that the price and volume effects associated with S&P 500 addition derive from temporary price pressure. Findings pertaining to the nonoptioned stocks indicate that the price and volume effects associated with S&P addition reflect enhanced stock liquidity. The decrease in the bid/ask spread for nonoptioned stocks is attributed to informational efficiencies achieved via index arbitrage trading, and it is argued that this effect is mitigated for optioned stocks due to the pre‐existence of arbitrage trading between the option and the underlying stock. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Financial Review Wiley

The liquidity effects associated with addition of a stock to the S&P 500 index: evidence from bid/ask spreads

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Publisher
Wiley Subscription Services, Inc., A Wiley Company
Copyright
Copyright © 1998 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0732-8516
eISSN
1540-6288
D.O.I.
10.1111/j.1540-6288.1998.tb01612.x
Publisher site
See Article on Publisher Site

Abstract

This study examines changes in stock liquidity, as measured by the bid/ask spread, when a stock is added to the S&P 500 Index. The paper presents evidence of a significant decrease in the bid/ask spread upon S&P 500 addition, however, this effect is limited to only those stocks that were not trading listed options. Further, the decrease in the bid/ask spread for nonoptioned stocks is accompanied by a significant and permanent increase in share price and trading volume. While optioned stocks experience a permanent increase in trading volume, they experience only a temporary increase in share price. The findings for optioned stocks support the hypothesis that the price and volume effects associated with S&P 500 addition derive from temporary price pressure. Findings pertaining to the nonoptioned stocks indicate that the price and volume effects associated with S&P addition reflect enhanced stock liquidity. The decrease in the bid/ask spread for nonoptioned stocks is attributed to informational efficiencies achieved via index arbitrage trading, and it is argued that this effect is mitigated for optioned stocks due to the pre‐existence of arbitrage trading between the option and the underlying stock.

Journal

Financial ReviewWiley

Published: Feb 1, 1998

References

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