DuPont, Celladon, Deutsche Bank, Mylan, ImmunoGen and Akorn are big market movers

Stocks that moved substantially or traded heavily Monday on the New York Stock Exchange and the Nasdaq Stock Market:

NYSE

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DuPont Co., up $3.29 to $74.81

Institutional Shareholder Services said investor Nelson Peltz, who is seeking to break up the chemical maker, should be given seats on its board.

Deutsche Bank AG, down $1.65 to $32.61

The bank is reorganizing through branch spinoffs, office closings and by cutting its investment banking division.

Mercury General Corp., down $1.03 to $57.27

The auto insurance company reported a drop in first-quarter net income and the results fell short of Wall Street forecasts.

Nasdaq

Mylan NV, down $4.34 to $71.72

The drug developer rejected rival Teva Pharmaceutical Industries' $40.1 billion buyout offer, saying it undervalued the company.

Celladon Corp., down $11.04 to $2.64

The biotechnology company's potential heart failure treatment Mydicar failed to meet key goals in a pivotal clinical trial.

Applied Materials Inc., down $1.83 to $19.97

The semiconductor company called off its $9.4 billion buyout of Tokyo Electron because of regulators' antitrust concerns.

ImmunoGen Inc., down $1.10 to $8.86

The cancer drugmaker suffered two setbacks to its drug development pipeline.

Akorn Inc., down $12.14 to $43.10

The drug developer will restate previous financial statements because it overstated certain amounts.