Check out which companies are making headlines before the bell:
AstraZeneca, Pfizer—The U.S. pharmaceutical giant raised its takeover offer for the British drug maker to $106 billion. However, the increased bid was rejected by AstraZeneca, calling it "inadequate" and said it undervalues the company.
Marsh & McLennan–The insurer beat estimates by a penny with first quarter profit of 81 cents per share, excluding certain items. CEO Dan Glaser points to margin expansion in the company's risk and insurance services as well as its consulting segments.
CVS Caremark–The company reported first quarter profit of $1.02 per share, excluding certain items, two cents below estimates. CVS said its bottom line was impacted by "unforeseen weather-related issues."
Newell Rubbermaid–Newell earned 35 cents per share for the first quarter, three cents above estimates, but revenue fell short as sales declined in most of the household products maker's segments.
Wynn Resorts–Stern Agee upgraded the casino operator's stock to "buy" from "neutral", saying concerns about Wynn's VIP business in Macau are unfounded.
AutoNation–The car retailer reported an increase of 11 percent in comparable store sales for April.
Estee Lauder–The company beat estimates by nine cents with fiscal third quarter profit of 64 cents per share, with revenue above estimates as well. The beauty products maker saw growth during the quarter in both developed and emerging markets.
Texas Instruments–Nomura upgraded the chipmaker's stock to "neutral" from "reduce", saying profit margins have more upside than previously anticipated.
Oracle–Societe Generale upgraded the stock to "buy" from "hold", on anticipation of higher earnings as a software upgrade cycle takes hold.
Kraft Foods Group–The food producer beat estimates by nine cents with first quarter profit of 85 cents per share, though revenue was short of estimates. Results were helped by cost cuts and successful moves to hedge the cost of key ingredients.
Expedia–The online travel site's beat estimates by one cent with first quarter profit of 16 cents per share, excluding certain items. Revenue also beat consensus, as sales of airline tickets and hotel nights increased.
LinkedIn–The business social network earned 38 cents per share, excluding certain items, for the first quarter, four cents above estimates, with revenue beating projections as well. However, the company also projected current quarter revenue largely below Street estimates.
OpenTable–OpenTable reported first quarter profit of 45 cents per share, excluding certain items, beating forecasts by three cents. The online reservation service did, however, did disappoint investors as revenue did not increase as much as they had expected.
—By CNBC's Peter Schacknow
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