J.C. Penney Co. Inc., down $2.08 at $22.25
The department store chain said that Michael Francis, an executive brought in to help redefine the brand, is leaving the company.
Walgreen Co., down $1.87 at $30.09
The drugstore chain said it will pay $6.7 billion in cash and stock for a stake in European pharmacy retailer Alliance Boots.
Barnes & Noble Inc., down 61 cents at $14.63
The bookseller and Nook e-reader maker said that its fourth-quarter loss narrowed but was still wider than analysts expected.
Chesapeake Energy Corp., up $1.04 at $18.71
An ally to activist investor Carl Icahn will join the energy company's board this week as Icahn pushes for a leadership shake-up.
Microsoft Corp., up 86 cents at $30.70
In an attempt to take on Apple Inc.'s popular iPad, Microsoft announced a new tablet computer it calls "Surface."
Sonic Corp., up 28 cents at $9.17
A Sterne Agee analyst upgraded the fast food company's stock rating to "Buy," citing its new ads and improved products.
Network Equipment Technologies Inc., up 14 cents at $1.32
Internet hardware and software maker InSonus Networks said that it is buying the communications equipment maker for $41.3 million.
Citi Trends Inc., up $1.90 at $15.64
A Susquehanna analyst