In early trading on Wednesday, shares of Merck ( MRK ) topped the list of the day's best performing Dow Jones Industrial Average components, trading up 0.5%. Year to date, Merck registers a 17.4% gain.
And the worst performing Dow component thus far on the day is Boeing ( BA ), trading down 2.3%. Boeing is lower by about 1.7% looking at the year to date performance.
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