Stocks staged a positive reversal Friday, turning big losses at the open into solid gains by the close. The Nasdaq scored a 1.7% advance after being down 1.6%. The S&P rose 1.4%. The IBD 50 lagged with a 1% pop. Volume rose on both major exchanges. The gains in rising volume pointed to institutional buying. The S&P 500’s thrust came on Day 4 of an attempted rally, which along with the volume and price gain qualify as a follow-through day.