In April 2000, 30 stocks were replaced in the Nikkei 225 Index. The unusually broad index
redefinition allowed for a study of the effects of index-linked trading on the excess
comovement of stock returns. A large increase occurred in the correlation of trading
volume of stocks added to the index with the volume of stocks that remained in the index,
and opposite results occurred for the deletions. Daily index return betas of the additions
rose by an average of 0.45; index return betas of the deleted stocks fell by an average of
0.63. Theoretical predictions for changes in autocorrelations and cross-serial
correlations of returns of index additions and deletions were confirmed. The results are
consistent with the idea that trading patterns are associated with short-run excess
comovement of stock returns.