Five minutes into trade, the Dow Jones Industrial Average was up 43.23 points (0.32 percent) at 13,755.44.

The broad-based S&P 500 edged up 0.59 point (0.04 percent) to 1,493.15.

The tech-heavy Nasdaq Composite added 8.84 (0.28 percent) at 3,152.01.

The positive opening came after technology companies IBM and Google reported solid earning results Tuesday after the market closed. Apple is slated to report earnings later today.

"The US equity markets are modestly higher in early action, with the Street digesting a plethora of mixed earnings reports," said a Charles Schwab & Co market update.