Stocks that moved substantially or traded heavily Thursday on the New York Stock Exchange and Nasdaq Stock Market:
J.C. Penney Co. Inc., up $6.44 at $40.72
The department store chain, which is trying to reinvent itself, posted a 2012 profit outlook that was above what analysts expected.
Briggs & Stratton Corp., down $1.50 at $15.70
The engine maker said it will close a plant in Tennessee and shift the work to Georgia, eliminating about 690 jobs in the U.S.
United Rentals Inc., up $3.10 at $37.87
The company, which rents heavy equipment such as forklifts, posted fourth-quarter earnings that handily beat Wall Street expectations.
Caterpillar Inc., up $2.26 at $111.31
The maker of construction and mining equipment said that its fourth-quarter profit jumped 60 percent, on demand for new equipment.
Netflix Inc., up $20.97 at $116.01
The video subscription service said that it added 600,000 subscribers, almost as many customers as it lost after a price increase.
Arctic Cat Inc., up $4.77 at $28.58
Higher sales of its snowmobiles and all-terrain vehicles helped the company nearly double quarterly earnings and beat expectations.
Micromet Inc., up $2.66 at $10.94
Amgen, the world's largest biotech company, said it is buying the developer of cancer therapies for $1.16 billion in cash.
Republic Airways Holdings Inc., up 80 cents at $5.33
The airline raised its outlook for certain key metrics thanks to the strong performance of its Frontier Airlines service.