Stocks that moved substantially or traded heavily Monday on the New York Stock Exchange and the Nasdaq Stock Market:
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Alamos Gold Inc. (AGI), up 39 cents to $6.28
The Canadian gold mining company is merging with fellow gold mining company AuRico Gold Inc. in a deal worth about $1.5 billion.
Basic Energy Services Inc. (BAS), down 65 cents to $7.67
The energy industry services company said its rig count remained unchanged and it continues facing fierce rate competition.
Perrigo Co. (PRGO), up $3.33 to $201.88
Mylan said it filed notice of its proposed buyout with antitrust regulators as it awaits a response from the generic drug company.
Builders FirstSource Inc. (BLDR), up $4.67 to $11.57
The building materials supplier will buy fellow buildings material supplier ProBuild Holdings LLC for about $1.63 billion in cash.
Sears Holdings Corp. (SHLD), up 31 cents to $43.24
The retailer entered a deal with mall operator Simon Property Group aimed at extracting value from its real estate holdings.
JetBlue Airways Corp. (JBLU), up 81 cents to $19.85
The airline reported a 9.2 percent boost in March passenger traffic compared with a year ago and a 6.2 percent boost in capacity.
Arrowhead Research Corp. (ARWR), up 9 cents to $8.00
The Food and Drug Administration cleared the drug developer for midstage development of a potential hepatitis B treatment.
Qualcomm Inc. (QCOM), down 43 cents to $68.73
The chipmaker is being urged to break up by Jana Partners LLC in order to boost the stock, according to the Wall Street Journal.