In early trading on Thursday, shares of Tyson Foods topped the list of the day's best performing components of the S&P 500 index, trading up 4.3%. Year to date, Tyson Foods registers a 73.7% gain.
And the worst performing S&P 500 component thus far on the day is Cisco Systems, trading down 7.3%. Cisco Systems is showing a gain of 3.7% looking at the year to date performance.
Two other components making moves today are Symantec, trading down 3.0%, and CBS, trading up 2.5% on the day.