Stock futures slumped lower ahead of Friday’s open, with earnings reports generating some emphatic premarket action. Dow futures dived 35.8 points below fair market value. Nasdaq 100 futures tumbled 16.5 points. S&P 500 futures were off 3.7 points. Small caps were soft ahead of the bell, with Russell 2000 futures down 11 points. The stock market today looked to close out the week sending investors mixed signals.