In early trading on Monday, shares of Perrigo Company ( PRGO ) topped the list of the day's best performing components of the S&P 500 index, trading up 3.6%. Year to date, Perrigo Company has lost about 36.5% of its value.
And the worst performing S&P 500 component thus far on the day is American Airlines Group ( AAL ), trading down 2.7%. American Airlines Group is lower by about 11.5% looking at the year to date performance.
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