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After-Hours Buzz: AMD, MLNX & More

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Check out which companies are making headlines after the bell Wednesday:

AMD - The chipmaker named Devinder Kumar as its new CFO. Kumar has been the company's interim CFO since September when Thomas Seifert resigned. Shares were slightly lower in extended-hours trading.

(Read More: Dow Surges 300 on 'Cliff' Deal, S&P Tops 1460 )

Mellanox Technologies - The communications equipment manufacturer lowered its fourth-quarter revenue outlook to between $119 million and $121 million, citing challenging macroeconomic conditions, from a previous guidance of between $145 million and $150 million. Wall Street analysts expect the company to post sales of $148 million. Shares plunged nearly 20 percent in extended-hours trading after being temporarily halted.

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Hormel Foods - The maker of Spam and other canned foods changed its dividend payout date to mid-February from mid-January.

Lexmark - The imaging products manufacturer acquired Acuo Technologies in a deal worth nearly $45 million.

Prudential Financial - The financial services company completed its acquisition of the Hartford's individual life insurance business. The deal was initially announced in September. Shares edged lower in extended-hours trading.

Ralcorp - Widely-followed investment advisor Mario Gabelli reported a 5.1 percent stake in the food products company, according to an initial 13D filing.

Buffalo Wild Wings - Hedge fund SAC Capital disclosed a 5 percent stake in the restaurant chain in the latest 13G filing. Shares edged higher in extended-hours trading.

Macquarie Research initiated coverage of Akamai and Limelight Networks with a "neutral" rating.

(Read More: CNBC's Market Insider Blog )

—By CNBC's JeeYeon Park (Follow JeeYeon on Twitter: @JeeYeonParkCNBC)

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

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    Patti Domm is CNBC Executive Editor, News, responsible for news coverage of the markets and economy.

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