S&P 500 will not include SpaceX for at least a year and is setting a precedent that major mega-cap IPOs won't be included, so investors seeking that growth exposure will shift to the NASDAQ 100 and Russell 1000 growth, creating index dispersion and potential outperformance relative to the S&P 500.
Because the S&P 500 will exclude SpaceX for at least a year due to the index committee's decision not to fast-track mega-cap IPOs, investors seeking SpaceX exposure will turn to benchmarks that include it sooner, such as the Nasdaq 100 and Russell 1000 Growth. This could drive outperformance of those indices relative to the S&P 500 and create index dispersion similar to the Korea EM debate.