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Merck, Pfizer Earnings Send Shares in Opposite Directions (NYSE: PFE) (NYSE: MRK)

The Pfizer earnings and Merck earnings reports were both released this morning (Tuesday), and investors are acting differently to these major pharmaceutical stocks.

Pfizer Inc. (NYSE: PFE) stock was up 1.3% in early trading despite missing earnings per share estimates. Merck shares were down 2% despite topping estimates.

Here's why the stocks are behaving so differently...