Merck&Co rose by 3.02% to trade at $72.53 by 10:05 (14:05 GMT) on Monday on the NYSE exchange.
The volume of Merck&Co shares traded since the start of the session was 1.25M. Merck&Co has traded in a range of $71.37 to $72.58 on the day.
The stock has traded at $73.4900 at its highest and $66.1000 at its lowest during the past seven days.
