At 10:18 a.m. ET, the Dow Jones Industrial Average was up 306.62 points, or 0.89%, at 34,718.31, the S&P 500 was up 42.77 points, or 0.97%, at 4,434.46, and the Nasdaq Composite was up 168.88 points, or 1.27%, at 13,501.24.
The International Monetary Fund cut its forecast for global economic growth by nearly a full percentage point, citing Russia's war in Ukraine and growing inflationary pressures.
Twitter Inc slipped 2% despite overnight reports that more private-equity firms have expressed interest in participating in a deal for the micro-blogging site.
Travelers Companies Inc fell 4% even as the property and casualty insurer posting better-than-expected quarterly profit.