My theory is that the index funds that need to be 'in' the newly added tickers have their managing entity buying pre russel, and arranged sell/buys are all done within the fund the day of actual listing...if they wouldnt have a pool of shares guaranteed available on the day of index listing can you imagine the buying frenzy! Probably be like the last month all in one day!
This may explain the absolutely huge volume today with virtually no price movement.
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