Stocks that moved substantially or traded heavily Monday on the New York Stock Exchange and the Nasdaq Stock Market:
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Halliburton Co., down $5.85 to $49.23
The oilfield services company is buying rival Baker Hughes Inc. in a cash-and-stock deal worth $34.6 billion as oil prices tumble.
Allergan Inc., up $10.55 to $209.20
The Botox maker is being bought by Actavis for $66 billion, which tops a bid made by Valeant Pharmaceuticals last spring.
Exterran Holdings Inc., up $3.04 to $36.81
The natural gas services company is spinning off its international and fabrication businesses into a new publicly traded company.
Denbury Resources Inc., down $1.19 to $10.01
The oil and gas producer plans to cut its 2015 capital spending by 50 percent because of the recent drop in oil prices.
Celldex Therapeutics, up $4.09 to $18.25
An experimental drug developed by the biotechnology company helped extend survival rates of patients in a brain tumor study.
Amicus Therapeutics Inc., up $1.01 to $6.70
The biotechnology company reported positive results in a second late-stage study of its potential treatment for Fabry disease.
DreamWorks Animation SKG Inc., down $3.71 to $22.31
Talks between the animation studio and toy company Hasbro Inc. have faded, the Wall Street Journal reported late Friday.
ShoreTel Inc., down 80 cents to $7.41
Mitel Networks Corp. withdrew its buyout bid for the telecommunications services company, citing repeated refusals to talk.