Rosetta Stone, BP, Denny’s, Dick’s Sporting Goods among big market movers Thursday

Rosetta Stone, BP, Denny’s among big movers

NEW YORK — Stocks that moved substantially or traded heavily Thursday on the New York Stock Exchange and Nasdaq Stock Market:

NYSE:

Rosetta Stone Inc., down $2.09 at $22.07

A Baird analyst downgraded the language software provider, disappointed the company’s CFO is leaving just before the release of a major new product.

Ambac Financial Group Inc., down 42 cents at 65 cents

The beleaguered bond insurer said it could default on its debt and possibly file for a prepackaged bankruptcy.

BP PLC, down $5.48 at $29.20

Investors fear the British oil company will bow to U.S. political pressure and cut dividends to help pay for the Gulf of Mexico oil spill disaster.

Viacom Inc., up 59 cents at $36.52

The entertainment conglomerate, which owns MTV Networks, announced its first dividend payment and resumed a $4 billion stock buyback program.

Dick’s Sporting Goods Inc., up 69 cents at $26.94

Citi Investment Research added the athletic retailer to its top stock picks after the recent drop in the company’s share price.

NASDAQ:

Allscripts-Misys Healthcare Solutions, Inc., down $1.78 at $16.64

The health care information technology company is buying its rival for about $1.3 billion in stock.

Denny’s Corp., up 9 cents at $2.74

After a bitter proxy fight with investors, the struggling restaurant chain is looking for a new CEO while its chairwoman acts as interim chief.

Rewards Network Inc., up $3.77 at $13.67

Real estate mogul Sam Zell said his private equity firm was interested in buying out the dining rewards company.