After strong earnings from aircraft manufacturing behemoth Boeing Co. (BA) propelled the U.S. market higher Wednesday, stocks were mixed Thursday. 

The Dow Jones Industrial Average fell more than 50 points Thursday afternoon, giving back some of its gains Wednesday. 

Two healthcare giants report earnings Friday, as well as one big oil company and one big industrial.  

Cigna

Cigna Corp. (CI) reports fourth quarter earnings before the opening bell Friday. Wall Street is expecting adjusted earnings-per-share of $2.45 and GAAP EPS of $1.93. Revenue is expected to be $11.39 billion.

Merck

Merck & Co.   (MRK) will report fourth quarter earnings before the market opens Friday. Adjusted EPS is expected to come in at $1.04 on revenue of $10.95 billion. 

Exxon Mobil

Exxon Mobil Corp. (XOM) reports fourth quarter earnings before the market opens Friday. Wall Street is looking for adjusted EPS of $1.08, which would represent a 22.7% year-over-year increase, and GAAP EPS of $1.082, which would be a 45% decrease. Revenue is expected to be $73.09 billion. 

Honeywell

Honeywell International Inc. (HON) reports fourth quarter earnings before the opening bell Friday. Analysts estimate adjusted EPS will be $1.89. Revenue is estimated to be $9.7 billion. 

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