Mylan , Chesapeake Energy, Fortinet, Medtronic and Hain Celestial are big market movers

Associated Press

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

NYSE

Continue Reading Below

Medtronic Inc., up $2.22 to $65.02

The medical device maker switched to $16 billion in financing to buy Covidien after the U.S. restricted tax-saving, overseas deals.

Diamond Offshore Drilling Inc., down $1.83 to $33.00

The entire energy complex is under pressure, particularly oilfield service companies, as the price of crude continues to slump.

Penske Automotive Group Inc., up $2.46 to $43.55

Warren Buffett's acquisition of a big auto retailer pushed the entire sector higher as the billionaire talks market consolidation.

Chesapeake Energy Corp., down 48 cents to $21.75

The government reported a surge in natural gas supplies this week, pushing prices down and pressuring shares of drilling companies.

Nasdaq

Mylan Inc., up $3.73 to $50.23

The generic drug maker boosted its outlook for the third quarter and the year thanks to new drug launches and drug approvals.

Fortinet Inc., up 56 cents to $25.55

News of a massive data breach at JPMorgan Chase, the nation's biggest bank, sent shares of major tech security companies higher.

Jack in the Box Inc., up $1.49 to $68.86

The burger restaurant hit an all-time high after its Mexican chain Qdoba went after competitors with free extras like guacamole.

The Hain Celestial Group Inc., up 30 cents to $103.30

The health food company's buying spree is getting Wall Street's attention as Americans shift away from frozen or processed food.