US STOCKS-Wall St flat with earnings eyed; Apple, Qualcomm lift Nasdaq
* Big banks due to report results this week
* Qualcomm rises after investors urge spinoff of unit
* Builders FirstSource to buy ProBuild for $1.63 bln
* Indexes up: Dow 0.17 pct, S&P 0.15 pct, Nasdaq 0.45 pct (Updates to open)
By Tanya Agrawal
April 13 (Reuters) - The Dow and S&P 500 were little changed in morning trading on Monday after three straight days of gains as the corporate earnings season was poised to kick into high gear with a slew of reports this week.
Gains on the Nasdaq outpaced the two other major Wall Street indexes, buoyed by gains in Qualcomm, up 1.6 percent at $70.28, and Apple, up 0.8 percent at $128.16.
Activist investor Jana Partners asked chipmaker Qualcomm to consider spinning off its chip unit from its patent-licensing business to boost its sagging stock price.
Analysts said Apple will likely ramp up production of the Apple Watch on strong pre-orders following its launch. Continuación...