Merck&Co rose by 3.05% to trade at $84.68 by 11:16 (15:16 GMT) on Tuesday on the NYSE exchange.
The volume of Merck&Co shares traded since the start of the session was 5.51M. Merck&Co has traded in a range of $82.82 to $84.70 on the day.
The stock has traded at $85.0600 at its highest and $80.2500 at its lowest during the past seven days.
