Merck&Co rose by 3.09% to trade at $85.03 by 09:57 (13:57 GMT) on Tuesday on the NYSE exchange.
The volume of Merck&Co shares traded since the start of the session was 3.54M. Merck&Co has traded in a range of $83.56 to $85.17 on the day.
The stock has traded at $85.1400 at its highest and $80.8900 at its lowest during the past seven days.
