The tech-heavy Nasdaq is on track for its biggest two-quarter jump since the dotcom crash in 2000.
Data showed US consumer confidence rebounded more than expected in September as households' views of the labor market improved.
Also on the radar were talks between US House of Representatives Speaker Nancy Pelosi and White House Adviser Larry Kudlow on a coronavirus relief bill a day after Democratic lawmakers had unveiled a new, $2.2 trillion package.
By 10:28 a.m. ET, the Dow Jones Industrial Average was up 5.12 points, or 0.02%, at 27,589.18, and the S&P 500 was up 4.51 points, or 0.13%, at 3,356.11. The Nasdaq Composite was up 11.84 points, or 0.11%, at 11,129.36.