MARKET EFFECTS OF CHANGES IN THE STANDARD & POOR'S 500 INDEX

Christopher G. Lamoureux; James W. Wansley

doi:10.1111/j.1540-6288.1987.tb00318.x

MARKET EFFECTS OF CHANGES IN THE STANDARD & POOR'S 500 INDEX

Christopher G. Lamoureux, James W. Wansley

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

This paper examines the impact on stock returns of changes in the Standard & Poor's (S&P) 500 index. S&P states that firms are not added to or deleted from the index for valuation reasons but rather to maintain or improve the index's representative character. Results from market response tests indicate that stocks added to (deleted from) the index since 1975 experience a significant positive (negative) announcement day excess return. No announcement effect occurs in S&P changes prior to 1976. These announcement effects may be explained by a price‐pressure hypothesis or by an information effect. Results of tests conducted to isolate which of these phenomena is present are reported.

Original language	English (US)
Pages (from-to)	53-69
Number of pages	17
Journal	Financial Review
Volume	22
Issue number	1
DOIs	https://doi.org/10.1111/j.1540-6288.1987.tb00318.x
State	Published - Feb 1987
Externally published	Yes

ASJC Scopus subject areas

Finance
Economics and Econometrics

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10.1111/j.1540-6288.1987.tb00318.x

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MARKET EFFECTS OF CHANGES IN THE STANDARD & POOR'S 500 INDEX

Abstract

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