May 31 SharesSome info I saw from a portfolio manager on twitter.
"MSCI rebalanace - Arx had some 30 mln shares expected to be purchased - largest stock in rebalance basket for Cda in World MSCI index. June 1 index incl meant most bought EOD May 31.
Handle is hallsy8036 if you guys are interested, he posts and comments some good information.