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Verizon also says it "continues to work with Yahoo to assess the impact of data breaches."
Chemical and seed producer DuPont reported a quarterly profit, compared with a loss a year earlier when the company booked charges of $770 million.
The tech giant has also expanded its efforts into new areas, including cloud computing and entertainment.
Johnson & Johnson reported a 1.7 percent rise in fourth-quarter sales, due to a strong demand for its newer products.
Lockheed Martin posted a 19.4 percent rise in quarterly sales, helped by higher revenue from the F-35 and Sikorsky helicopters businesses.
3M, the maker of Scotch tape and Post-it notes, reported an 11.3 percent increase in quarterly profit as the company kept a tight lid on costs.
Travelers reported an 8.9 percent rise in quarterly net profit on Tuesday, helped by a rise in investment earnings and a gain from a dispute settlement.
Yahoo reported quarterly earnings that beat analysts' expectations on Monday, and revenue that topped Wall Street's forecasts.
McDonald's turnaround efforts started to show results, especially in markets outside the U.S.
Halliburton on Monday warned of weakness in markets outside of North America, echoing comments made by larger rival Schlumberger last week.
Shares of General Electric edged lower after the company reported mixed earnings results.
Procter & Gamble on Friday reported second-quarter earnings and revenue that topped analysts' expectations.
The company said it added 7.05 million subscribers during the quarter, well above its own expectations of 5.2 million.
McDonald's is not immune to the restaurant industry's December slump. A franchisee survey sees same-store sales down in Q4.
Citigroup on Wednesday reported a quarterly profit $1.14 a share on revenue of $17.012 billion.
The Wall Street giant said it earned $5.08 a share on revenue of $8.17 billion.
The company said comparable sales declined 1.3 percent in the November-December period.
Morgan Stanley strikes a positive tone after its fourth quarter earnings report handily beat market expectations.
Tiffany said its sales during the November-December holiday period were "somewhat lower" than it had expected, hurt by lower consumer spending.
UnitedHealth on Tuesday posted quarterly earnings that beat expectations.
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