In early trading on Wednesday, shares of Nektar Therapeutics ( NKTR ) topped the list of the day's best performing components of the S&P 500 index, trading up 2.3%. Year to date, Nektar Therapeutics registers a 2.3% gain.
And the worst performing S&P 500 component thus far on the day is Alliant Energy Corp ( LNT ), trading down 19.1%. Alliant Energy Corp is lower by about 0.5% looking at the year to date performance.
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