U.S. stocks on track for biggest blown lead since April in final hour of trading

The S&P 500 is on track to book its biggest blown lead since April as the broad-market index is down nearly 1% in the last hour of trading on Friday, as news of a prolonged halt of natural gas flows through a key Russian pipeline rattles global markets, causing stocks to shake off earlier gains. The S&P 500
SPX,
-1.07%
is down 28 points, or 0.7%, to 3,937 in recent trade, after being up 1.3% at the highs. The Dow Jones Industrial Average
DJIA,
-1.07%
has shed 210 points, or 0.7%, to 31,445.24, reversing an earlier gain of 1.2%. The Nasdaq Composite
COMP,
-1.31%
retreated 108 points, or 0.9%, to 11,677. For the S&P 500, the daily turnaround would mark its biggest blown lead since April 12, when it was up 1.3%, but finished the session down 0.3%. The Dow is on track for its largest blown lead since June 28, when the blue-chip benchmark closed down 1.6%, after advancing 1.4% earlier in the day.