Twitter—Stern Agee upgraded Twitter to "neutral" from "underperform", saying recent changes will promote better user growth and engagement.
Yelp–Citi upgraded the online review site operator's stock to "buy" from "neutral", saying a recent pullback creates a buying opportunity and that it is confident in its growth forecasts for Yelp given the increasing importance of mobile use.
St. Jude Medical–The medical products maker earned 96 cents per share for the first quarter, one cent above estimates. The company said it is making progress at shifting its product mix to emphasize faster growing markets.
Intel –The chipmaker reported fiscal first quarter profit of 38 cents per share, one cent above estimates, with revenue essentially in line. Investors are also focusing on a better than expected forecast from Intel on its full year gross margin.
Yahoo–Yahoo matched Intel in the earnings department by reporting the exact same numbers: 38 cents per share for its fiscal first quarter, beating estimates by a penny. CEO Marissa Mayer said the company was poised for stable though modest growth, thanks to new initiatives in mobile and other areas.
CSX–The rail operator reported fiscal first quarter profit of 40 cents per share, three cents above estimates, with revenue in line. Overall, CSX's profits were down 14 percent from the year before, in large part due to weather related disruptions.
General Motors–The automaker plans to create a new unit that focuses on product quality and safety. The move was announced by CEO Mary Barra in a speech in New York.
UnitedHealth–The health insurance provider saw its rating cut to "neutral" from "buy" at Citi, citing limited opportunities for earnings growth this year.
Moelis & Co. (MC)–Moelis will begin trading on the New York Stock Exchange today, after pricing its IPO at $25 per share, below the expected range. The pricing values the independent investment bank at about $1.29 billion.
Syngenta–Syngenta said weak emerging market currencies will have a bigger impact on its results than it had previously thought. The Zurich-based company is the world's largest producer of crop chemicals.
—By CNBC's Peter Schacknow
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