The S&P 500 Index ($SPX) (SPY) on Monday closed down -0.35%, the Dow Jones Industrials Index ($DOWI) (DIA) closed down -0.51%, and the Nasdaq 100 Index ($IUXX) (QQQ) closed down -0.46%.  March E-mini S&P futures (ESH26) fell -0.34%, and March E-mini Nasdaq futures (NQH26) fell -0.47%. Stock indexes settled lower on Monday, led by losses in megacap technology stocks.  Also, Monday's plunge in metals prices weighed on mining stocks.  Lower bond yields were supportive of stocks, with the 10-year T-note yiel ...