Take a look at some of Thursday's midday movers:
Sirius XM moved higher after the satellite radio company approved a $2 billion buyback and announced a special 5 cent a share dividend.
JC Penney moved higher on hopes the company would forma REIT to acquire its real estate assets, following the lead of Canada's Loblaw, which announced that move today.
Yum Brands jumped after its CEO said he sees very solid sales growth in its restaurants in China.
Vera Bradley lost ground as the company issued a fourth-quarter warning and lowered its full-year revenue forecasts.
UTI Worldwide moved lower after weaker-than-expected quarterly earnings.
Safeway moved higher after the supermarket chain moved its dividend up to December from January.
Align Technology fell after the braces maker said it expects fourth-quarter profit and revenue to be at the lower end of guidance. As a result it is cutting jobs and shuffling management.
Noble Energy gained ground on an improved fourth-quarter outlook.
Athenahealth moved higher after its CFO told investors the company aims to grow sales at a 30 percent rate over the next five years.
Freeport-McMoRan continued to fall on news that its planned acquisitions of Plains and McMoran could lead to shareholder activism. Several investment banks have dropped their "buy" ratings on the company as a result of the buyouts.
(Read More: See CNBC's Market Insider Blog)
—By CNBC's Rich Fisherman.
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Patti Domm is CNBC Executive Editor, News, responsible for news coverage of the markets and economy.
A CNBC reporter since 1990, Bob Pisani covers Wall Street from the floor of the New York Stock Exchange.
Senior Producer at CNBC's Breaking News Desk.
Dominic Chu is a markets reporter for CNBC.
Evelyn Cheng is a markets writer for CNBC.
Sara Eisen is a correspondent for CNBC, focusing on currencies and the global consumer.