Investing.com - Merck&Co fell by 3.01% to trade at $80.91 by 09:43 (13:43 GMT) on Monday on the NYSE exchange.
The volume of Merck&Co shares traded since the start of the session was $1.01M. Merck&Co has traded in a range of $80.83 to $82.60 on the day.
The stock has traded at $84.1000 at its highest and $79.8500 at its lowest during the past seven days.