Kevin Davitt of Nasdaq talks about factors behind the index's outperformance. He starts with a look into the quarterly rebalancing of SpaceX (SPCX) and the expansion of its free float. As Kevin explains, SpaceX serves as a litmus test into how younger investors are favoring the Nasdaq-100 (NDX) more than prior generations. Keep an eye on volatility and options activity as well, as Kevin points to factors in each that he sees influencing the Nasdaq.