In early trading on Thursday, shares of Express Scripts Holding ( ESRX ) topped the list of the day's best performing components of the S&P 500 index, trading up 11.9%. Year to date, Express Scripts Holding registers a 10.1% gain.
And the worst performing S&P 500 component thus far on the day is Kroger ( KR ), trading down 9.3%. Kroger is lower by about 13.3% looking at the year to date performance.
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