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by tristanj 11 days ago
But 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.
1 comments
cman1444 11 days ago
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?

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tristanj 11 days ago
Yes, because that number increases to 1-2% of the index after the IPO lockup period ends.

There are three IPOs coming this year that meet this criteria.

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anonymars 11 days ago
Then it seems pretty disingenuous to keep arguing it's only 0.125% so it's not a big deal
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