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• Par Pharmaceutical jumped $13.42 to $50. The generic drug maker agreed to be acquired for $1.84 billion in cash by the private investment firm TPG. The offer was a 37 percent premium to Friday’s closing price.

• Yahoo rose 34 cents in after-hours trading to $15.98 after the company named longtime Google executive Marissa Mayer to be its next CEO. Mayer will be the fifth leader the struggling Internet pioneer has had in the past five years.

Declining stocks narrowly outpaced rising ones. Volume was light at 2.9 billion shares.