The competitive effects of S&P 500 Index revisions

Sheng‐Syan Chen and Yueh‐Hsiang Lin

Journal of Business Finance & Accounting, 2018, vol. 45, issue 7-8, 997-1027

Abstract: Firms added to the S&P 500 Index gain a competitive advantage over their non‐S&P 500 industry competitors. They experience positive stock valuation effects at the expense of competitors. The inclusion is associated with both reductions in financial constraints and the cost of equity and increases in capital investment for the newly added firms. When the increase in capital investment is greater, they gain more market share and enjoy better valuation effects. Rivals’ share price responses are negatively related to the announcement effect of the newly added firm. Deletions from the index, however, do not have symmetric effects.

Date: 2018
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