Shares of Pfizer have been on the decline, losing some 5% from its January 5 high of $33.61 a share.
Wall Street titan David Einhorn likes Apple's stock.
U.S. stocks were mixed Wednesday even amid better-than-expected earnings from the banking sector.
Citigroup reported fourth-quarter earnings that topped estimates. The company returned $4.7 billion of capital to shareholders during the quarter.
Goldman Sachs reported fourth-quarter earnings that topped Wall Street's estimates, thanks in part to a 25% increase in trading revenue.
President-elect Donald Trump's pick for Health and Human Services Secretary will be questioned about plans to overhaul the Affordable Care Act.
Big tobacco companies are merging as customers turn to vaping.