The S&P 500 already made a big call on SpaceX stock and index fund investors need to know it

Americans have more money invested for retirement in passive S&P 500 Index funds than any other investment. The Vanguard and BlackRock S&P 500 ETFs alone manage nearly $2 trillion in assets, with the Vanguard ETF ( VOO ) recently passing the $1 trillion mark. But they won't be managing SpaceX shares any time soon for retail investors clammoring to get a piece of the action in Friday's mega-cap IPO , the biggest in the history of the market. …