Pfizer Inc. stock underperforms Wednesday when compared to competitors

Shares of Pfizer Inc. PFE slumped 0.47% to $38.30 Wednesday, on what proved to be an all-around mixed trading session for the stock market, with the S&P 500 Index SPX rising 0.45% to 4,137.64 and the Dow Jones Industrial Average DJIA falling 0.09% to 33,531.33.

This was the stock's second consecutive day of losses.