Check out which companies are making headlines before the bell:
UnitedHealth (UNH)-The health insurer reported first quarter profit of a $1.10 per share, one cent above estimates, though revenue fell short. The company said it f aced some headwinds from new taxes related to the Affordable Care Act, as well as weaker Medicare funding.
DuPont (DD)-The chemicals maker matched estimates by earning $1.58 per share for the first quarter, but revenue was shy of estimates. DuPont said weather-related factors shaved seven cents per share off the quarter's profits.
General Electric (GE)-GE beat estimates by a penny with first quarter profit of 33 cents per share, with revenue essentially in line. The industrial giant's results were helped by a rebound in its industrial businesses.
Mattel (MAT)-The toymaker reported a surprise quarterly loss of three cents per share, compared to estimates of a 9 cents per share profit. Mattel cited a "challenging retail environment" in reporting its quarterly results.
Morgan Stanley (MS)-The Wall Street giant beat estimates by nine cents with first quarter profit of 68 cents per share, excluding certain items. Morgan Stanley also doubled its quarterly dividend to ten cents per share.
Schlumberger (SLB)-The oilfield services company earned $1.21 per share for the first quarter, excluding certain items, a penny above estimates. The company was helped by growth in North America, the Middle East, and Asia.
Post Holdings (POST)-The cereal maker will buy eggs and dairy producer Michael Foods from its private equity firm owners for $2.45 billion.
BlackRock (BLK)-The investment firm earned $4.43 per share for the first quarter, 32 cents above estimates, thanks in part to a jump in assets under management.
PepsiCo (PEP) -The beverage and snack giant reported first quarter profit of 83 cents per share, excluding certain items, beating estimates of 75 cents. Pepsi was helped by growth in its snack foods businesses, which overcame weakness in the beverage segment.
Google (GOOGL)-The search giant reported first quarter profit of $6.27 per share, excluding certain items, missing estimates of $6.41. Revenue also missed, partially because of declining ad prices, while paid click volume growth also fell short of forecasts.
IBM (IBM)-Big Blue earned $2.54 per share for the first quarter, excluding certain items, matching estimates. Revenue did fall short of estimates, with IBM posting its lowest quarterly sales in five years. IBM's results were impacted by a drop in demand for its servers.
American Express (AXP) -The credit card big beat estimates by three cents with quarterly profit of $1.33 per share for the first quarter, though revenue was light. The company was able to benefit from increased credit card spending by customers, while clamping down on its expenses.
SanDisk (SNDK) - The company earned $1.44 per share, excluding certain items, for the first quarter, 18 cents above estimates, with revenue slightly above forecasts. The memory chip maker also increased its profit margin forecast for the year, as it sold more solid-state drives.
Capital One (COF)-Capital One saw first quarter profit come in 22 cents above estimates at $1.91 per share, though revenue was slightly short. The issuer of credit cards was helped by a 17 percent cut in its provision for bad loans.
Yahoo (YHOO) -CEO Marissa Mayer wants to pitch Apple (AAPL) on making Yahoo its default search engine rather than Google, according to Re/code. Separately, Mayer received $24.9 million in 2013 compensation, according to an SEC filing, down from $36.6 million in 2012.
Sony - The electronics giant has sold more than seven million of its PlayStation 4 videogame consoles in the four months it's been on sale. That's double the sales of the console it succeeded, the PlayStation 3, in a similar time period.
Weibo (WB)-The Twitter (TWTR) of China will begin trading on the Nasdaq today, after a weaker than expected IPO pricing. The microblogging service's shares were priced at $17 apiece, at the low end of the expected range, and it sold fewer shares than expected. Weibo is owned by China-based web portal Sina (SINA).
-By CNBC's Peter Schacknow
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