The S&P 500 Index ($SPX) (SPY) on Thursday closed down -1.74%, the Dow Jones Industrial Average ($DOWI) (DIA) closed down -1.01%, and the Nasdaq 100 Index ($IUXX) (QQQ) closed down -2.38%. June E-mini S&P futures (ESM26) fell -1.72%, and June E-mini Nasdaq futures (NQM26) fell -2.34%. Stock indexes sold off sharply on Thursday, with the Nasdaq 100 falling to a 6.5-month low. Stocks slumped on Thur...