In early trading on Monday, shares of Gilead Sciences ( GILD ) topped the list of the day's best performing components of the S&P 500 index, trading up 2.6%. Year to date, Gilead Sciences registers a 42.0% gain.
And the worst performing S&P 500 component thus far on the day is Constellation Brands ( STZ ), trading down 1.5%. Constellation Brands is showing a gain of 22.1% looking at the year to date performance.
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