For SpaceX (and possible the others): Yes it can, since they changed the rules to force over $30 trillion in passive 401k and retirement money to buy SpaceX at IPO valuations. From https://x.com/Hedgeye/status/2060435253928604065 : "Rule changes for the SpaceX $SPCX IPO: Index providers waived the profitability requirement and cut the seasoning window from 90 days to 5. This forces over $30 trillion in passive 401k a…
And more importantly forces them to sell the rest of the market.
Who will be on the other side of these trades? I suspect the stock market is not sufficiently liquid for all of that to happen in a single day without the rest of the market seeing a significantly depressed price, and index holders effectively gifting value to everyone else by effectively pre-announcing their large trades.