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Midday Movers: AAPL, KMX, MPC & More

Take a look at some of Monday's midday movers:

Apple dragged down the tech sector amid supply concerns after China Labor Watch, a human rights group said that a Foxconn plant in China making the iPhone 5 was crippled by a strike. Foxconn denied the report.

CarMax soared following a bullish analyst report. ITG Investment Research has confirmed to CNBC that its analyst, John Tomlinson issued a “generally positive” report CarMax Monday but did not provide further details.

Marathon Petroleum shares hit a new 52-week high. The company announced plans to buy a refinery from BP , which would make Marathon the fourth-largest refiner in the U.S.

Barnes & Noble gained, helped by sales of its Nook tablet. In an interview on CNBC, CEO William Lynch said preorders are at "the highest levels we've ever seen for the Nook."

Walt Disney slid after Caris & Co. cut its outlook on the conglomerate to “average” from “above average” saying the shares looked “fully valued."

American International Group shares hit a 52-week high. In 2008, the insurance company was the beneficiary of a $182 billion bailout, the biggest federal government bailout of a private company in U.S. history.

Other stocks making new 52-week highs include Wal Mart Stores , 3M Company and Clorox .

On the flip side, Jabil Circuit , Brooks Automation and Canon hit new 52-week lows.

(Read More: CNBC's Market Insider Blog)

—By CNBC's Lori Spechler.

Questions? Comments? Email us at marketinsider@cnbc.com

  • Patti Domm

    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.

  • CNBC Personal Finance Correspondent

  • JeeYeon Park is a writer for CNBC.com. Follow her on Twitter: @JeeYeonParkCNBC

  • Rick Santelli joined CNBC Business News as an on-air editor in 1999, reporting live from the floor of the Chicago Board of Trade.

  • Senior Producer at CNBC's Breaking News Desk.