This paper examines the impact of changes in the composition of real estate stock indices, considering companies
both joining and leaving the indices. Stocks that are newly included not only see a short-term increase
in their share price, but trading volumes increase in a permanent fashion following the event. This highlights
the importance of indices in not only a benchmarking context but also in enhancing investor awareness and
aiding liquidity. By contrast, as anticipated, the share prices of firms removed from indices fall around the
time of the index change. The fact that the changes in share prices, either upwards for index inclusions or
downwards for deletions, are generally not reversed, would indicate that the movements are not purely
due to price pressure, but rather are more consistent with the information content hypothesis. There is no
evidence, however, that index changes significantly affect the volatility of price changes or their operating
performances as measured by their earnings per share.
This paper examines the impact of changes in the composition of real estate stock indices, considering companiesboth joining and leaving the indices. Stocks that are newly included not only see a short-term increasein their share price, but trading volumes increase in a permanent fashion following the event. This highlightsthe importance of indices in not only a benchmarking context but also in enhancing investor awareness andaiding liquidity. By contrast, as anticipated, the share prices of firms removed from indices fall around thetime of the index change. The fact that the changes in share prices, either upwards for index inclusions ordownwards for deletions, are generally not reversed, would indicate that the movements are not purelydue to price pressure, but rather are more consistent with the information content hypothesis. There is noevidence, however, that index changes significantly affect the volatility of price changes or their operatingperformances as measured by their earnings per share.
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