Merck&Co rose by 3.02% to trade at $73.30 by 15:33 (20:33 GMT) on Wednesday on the NYSE exchange.
The volume of Merck&Co shares traded since the start of the session was 8.42M. Merck&Co has traded in a range of $70.98 to $73.32 on the day.
The stock has traded at $76.8900 at its highest and $70.9200 at its lowest during the past seven days.
