Shares of 3D systems fell after the maker of 3D printers reported quarterly results that were slightly better than expected but missed revenue forecasts. A previously announced three-for-two stock split also went into effect Monday.

Shares of Chesapeake Energy fell after the embattled natural gas producer sold some oil and gas assets to Sinopec for $1 billion.

FarmVille maker Zynga shares surged on reports New Jersey will revise online gambling laws.

Oil and gold prices rose, while the U.S. dollar fell versus the euro.

The yield on the 10-year Treasury note edged up to 1.99%, from 1.97% previously.