S&P 500 Movers: BIIB, MRNA

In early trading on Thursday, shares of Moderna topped the list of the day's best performing components of the S&P 500 index, trading up 4.5%.

Year to date, Moderna registers a 322.9% gain.

In early trading on Thursday, shares of Moderna topped the list of the day's best performing components of the S&P 500 index, trading up 4.5%.

Year to date, Moderna registers a 322.9% gain.

And the worst performing S&P 500 component thus far on the day is Biogen, trading down 5.7%.

Biogen is showing a gain of 23.8% looking at the year to date performance.

Two other components making moves today are Copart, trading down 4.1%, and Willis Towers Watson Public, trading up 3.5% on the day.