Merck stock drops nearly 4%: why MRK is lagging the market today
Merck shares fell 3.9% to $117.16 Monday, underperforming the broader market as investors weighed patent risks and 2026 earnings guidance. Amgen, Pfizer, and AbbVie also declined. Merck last week projected 2026 sales of up to $67 billion and warned of a $2.5 billion hit from generic competition and weaker COVID-19 drug sales. The Dow lagged as Merck and Amgen dragged on the index.