This article was automatically generated by Dow Jones using technology from Automated Insights.
Shares of Amgen Inc. tumbled 10.1% to $393.17 on what proved to be an all-around grim trading session for the stock market, with the S&P 500 Index falling 0.6% to 7,673.52 and Dow Jones Industrial Average falling 1.2% to 52,786.07.
This was the stock's second consecutive day of losses.
Amgen Inc. closed 12.0% below its 52-week high of $447.03, which the company achieved on August 25th.
The stock underperformed when compared to some of its peers, as Johnson & Johnson fell 2.2% to $269.12, Pfizer Inc. fell 2.3% to $27.79, and AbbVie Inc. fell 2.99% to $248.78.
Trading volume totaled 6.5 million, compared to the 50-day average of 2.4 million.
Data source: Dow Jones Market Data, FactSet