The Dow Jones industrial average was up 45 points, or 0.3 percent, to 17,485 as of 9:35 a.m. Eastern time Tuesday.
The Standard & Poor’s 500 index rose nine points, or 0.4 percent, to 2,076. The Nasdaq composite increased 13 points, or 0.3 percent, to 5,054.
Asian markets closed with modest losses a day after the Shanghai stock index plunged more than 8 percent, its worst fall since 2007.
European markets were mostly higher.
As stock markets calmed, investors moved money out of safe-play assets like bonds.
U.S. government bond prices fell. The yield on the 10-year Treasury note rose to 2.26 percent.