Stocks that moved substantially or traded heavily Monday on the New York Stock Exchange and the Nasdaq Stock Market:
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The DuPont Co., down $3.43 to $77.07
The chemical company rejected hedge fund Trian Fund Management's proposal to place four nominees on its board of directors.
Edwards Lifesciences Corp., up $13.29 to $148.64
Researchers presented positive data for the medical device maker's third-generation heart-valve replacement system.
Life Time Fitness Inc., up $3.48 to $70.68
The gym operator will sell itself to two private-equity firms for more than $2.8 billion.
Penn West Petroleum Ltd., down 5 cents to $1.37
The oil and gas company and its industry peers saw shares fall as the price of crude oil fell to its lowest level in six years.
A. Schulman Inc., up $1.86 to $43.92
The plastic compounds and resins supplier will buy privately held Citadel Plastics for $800 million.
Salix Pharmaceuticals Ltd., up $3.35 to $172.75
Valeant raised its offer for the drug maker by more than $1 billion, forcing rival bidder Endo International out of the running.
Kandi Technologies Group Inc., up $1.31 to $14.54
The Chinese vehicle maker reported a profit for 2014 on an 80 percent boost in revenue, driven by demand for electric vehicles.
iDreamSky Technology Limited, down $3.60 to $7.22
The Chinese maker of mobile and online games provided weaker-than-expected revenue guidance.