This paper examines the effects of changes in the FTSE/ATHEX indices.  The benefit of analyzing changes in these indices is that they are determined by a ranking by market capitalization at regular semi annual reviews. Changes in indices composition should therefore have absolutely no direct information content.  I find that stocks added to or deleted from these indices experience significant changes in stock price on the announcement day and the effective day.  The results suggest that temporary price pressure play a role in the observed revision effect.