alt Hacker NewsBut that wasn't going to happen with the S&P 500, the proposal was to reduce inclusion time from 12 months to 6 months, and this did not pass. 6 months is more than enough time for price discovery to occur.
And even if it was added to the index immediately after IPO, index weighting in S&P is float weighted, SpaceX at IPO will have minimal float, and SpaceX would be ~0.125% of the index at IPO. Not much to matter.
That ".125% is not much to matter" argument also cuts the other way, against the Matt Levine argument that the S&P is excluding trillion dollar companies and should adjust the rules for them.
Should S&P really adjust the rules for such a small portion of the index?