Why Amazon and Uber investors might wish those stocks weren’t joining Dow indexes

A previous version of this column indicated Uber Technologies was joining the Dow Jones Industrial Average. Uber has been selected to enter the Dow Jones Transportation Average. The column has been corrected. Amazon.com AMZN, -0.10%and Uber Technologies UBER, -0.43%shareholders would do well to pay attention to a stock-market pattern that doesn’t favor these two stocks. Amazon is replacing Walgreens Boots Alliance WBA, -2.09%in the Dow Jones Industrial Average DJIA,while Uber pulls into Je