In early trading on Monday, shares of Symantec topped the list of the day's best performing components of the S&P 500 index, trading up 10.3%. Year to date, Symantec has lost about 23.3% of its value.
And the worst performing S&P 500 component thus far on the day is Xerox, trading down 8.7%. Xerox is lower by about 5.5% looking at the year to date performance.
Two other components making moves today are Viacom, trading down 5.9%, and Nektar Therapeutics, trading up 4.6% on the day.