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Gaming the FTSE 100 index

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  • Danbolt, Jo
  • Hirst, Ian
  • Jones, Edward

Abstract

In the UK (unlike the US and many other countries), companies enter and exit the main stock market index (FTSE 100) according to a clear set of rules based on market capitalisation. This creates an opportunity to game the system to secure or retain FTSE membership by manipulating capitalisation. There is considerable evidence in extant studies that index membership is beneficial, both for shareholders and managers. Hence, companies may adopt financial strategies designed to acquire or retain membership. We investigate two types of gaming. We define strategic gaming as a situation in which companies, which may initially be a number of places away from the boundary, make abnormal share issues cumulatively over several quarters. We find strong supportive evidence for this. For tactical gaming, which would involve companies in the very closest proximity to the boundary, we do not. Our analysis shows that gaming is limited to companies outside the index trying to get in. Companies that are close to exit do not game to retain their index place. The high natural volatility of market capitalisation makes success of gaming uncertain. Our central estimate is that about 5% of entries to the index appear to be the result of gaming.

Suggested Citation

  • Danbolt, Jo & Hirst, Ian & Jones, Edward, 2018. "Gaming the FTSE 100 index," The British Accounting Review, Elsevier, vol. 50(4), pages 364-378.
    • Handle: RePEc:eee:bracre:v:50:y:2018:i:4:p:364-378
    DOI: 10.1016/j.bar.2017.09.005
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