The S&P 500 Momentum Index surged 32% over two months, its best stretch ever. Goldman Sachs data warns similar rallies typically reverse within weeks.

The S&P 500 Index is up 371.05 points or 5.15% this month to 7580.06

The S&P 500 Momentum Index surged 32% over two months, its best stretch ever. Goldman Sachs data warns similar rallies typically reverse within weeks.