UnitedHealth (UNH) gains on buying Catamaran

UnitedHealth (NYSE: UNH) shares took on 3.6% to $122.24. The company has agreed to acquire Catamaran for about $12.8 billion in cash, planning to merge the pharmacy-benefit manager into its OptumRx unit. Share volume was 251,000, compared to an all-day average of 1.1 million