In early trading on Thursday, shares of Align Technology (ALGN) topped the list of the day's best performing components of the S&P 500 index, trading up 13.3%. Year to date, Align Technology registers a 17.7% gain.
And the worst performing S&P 500 component thus far on the day is Twitter (TWTR), trading down 17.2%. Twitter is showing a gain of 11.8% looking at the year to date performance.
Two other components making moves today are Alliance Data Systems Corp. (ADS), trading down 13.3%, and Lam Research Corp (LRCX), trading up 10.2% on the day.