Stocks that moved substantially or traded heavily on Monday:
Mattress Firm Holding Corp., up $34.01 to $63.75
The company agreed to be acquired by furniture seller Steinhoff International in a deal valued at $3.8 billion, including debt.
Sotheby's, up $4.21 to $36.49
The auction company reported better-than-anticipated second-quarter earnings and revenue.
Horizon Pharma PLC, up 86 cents to $20.96
The biopharmaceutical company's latest quarterly results handily beat Wall Street's expectations on strong revenue.
ON Semiconductor Corp., up 12 cents to $10.11
The semiconductor manufacturer's second-quarter earnings came in ahead of Wall Street's forecasts.
Bristol-Myers Squibb Co., down $2.98 to $60.30
The drugmaker's stock fell further following news Friday that its blockbuster cancer drug failed a study aimed at extending its use.
Allergan PLC, down $5.54 to $248.31
The Botox-maker reported a loss in the second quarter and its revenue fell short of Wall Street's forecasts
Netflix Inc., down $1.92 to $95.11
Published reports said that China's Alibaba Group is not preparing to invest in the video-streaming service.
Fred's Inc., down 26 cents to $14.03
Deutsche Bank downgraded the company's stock, citing growing competition from discount retailers and a slowdown sales of hepatitis C drugs.