In just a matter of weeks, $3.7 billion suddenly entered and then exited a BlackRock Inc. exchange-traded fund that barely had any day-to-day action over its 15 year life-span, leaving traders scratching their heads for clues as to what’s behind the move. On Jan. 25, after months of recording zero inflows, the iShares MSCI Kokusai exchange-traded fund (ticker TOK) brought in $3.7 billion, according to data compiled by Bloomberg. The ETF then continued trading like normal -- with mostly zero flows -- until the billions swiftly exited the fund over two separate trading days in February. Billions of dollars in flows is ... (full story)