U.S. stocks are starting the week sharply higher, led by energy companies.
UnitedHealth Group jumped 4 percent early Monday after the nation's largest health insurer said it would buy pharmacy benefits manager Catamaran Corp.
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The Dow Jones industrial average jumped 212 points, or 1.2 percent, to 17,923 as of 9:35 a.m. Eastern time.
The Standard & Poor's 500 index rose 15 points, or 0.8 percent, to 2,077. The Nasdaq composite climbed 37 points, or 0.8 percent, to 4,929.
The price of oil rose 12 cents to $49 a barrel in New York.
Government bond prices rose. The yield on the 10-year Treasury fell to 1.95 percent from 1.97 percent late Friday.