Did a Big Bet Help Trigger ‘Black Swan’ Stock Swoon? – WSJ.com. “Normally there can be hundreds of offers to buy the iShares Russell 1000 Growth Index exchange-traded fund, but at 2:46 p.m., there were just four bids north of $14 for a fund that had been trading at $51 minutes earlier”. So basically all liquidity in the market is hedge fund robots.