After-Hours Buzz: CSCO, ZNGA, FB & More

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

AMD - The chipmaker said it is not pursuing sale of itself or significant assets, according to the Wall Street Journal, sending shares lower in extended-hours trading. Shares rallied in the regular session following a Reuters report that the company hired JPMorgan to explore options. (Click here for after-hours quote.)

(Read More: Stocks End at 3-1/2 Month Lows, Led by Techs)

Cisco - The networking equipment company earned 48 cents a share, excluding one-time items, on sales of $11.88 billion, topping expectations for 46 cents a share on revenue of $11.77 billion. In addition, the tech bellwether handed in current quarter earnings guidance of between 47 cents a share and 48 cents a share, versus forecasts for 47 cents a share. The company also said it expects revenue to grow between 3.5 percent and 5.5 percent from year-ago levels. Shares jumped in extended-hours trading. (Click here for after-hours quote.)

Zynga - The social gaming company announced that chief accounting officer Mark Vranesh has been appointed as CFO. Vranesh succeeds David Wehner, who is leaving the company to pursue a senior position at Facebook. In addition, the company reaffirmed its 2012 outlook. Shares were unchanged in extended-hours trading. (Click here for after-hours quotes.)

Mosaic - The fertilizer company lowered its sales volume guidance for the next quarter, citing weak international crop nutrient market demand. Shares tumbled in extended-hours trading. hares of rival Potash also slipped in extended-hours trading. (Click here for after-hours quotes.)

Ubiquiti Networks - The wireless products maker announced its CFO John Ritchie has resigned. The company has started a search for a new CFO. Shares slid in extended-hours trading. (Click here for after-hours quote.)

MAKO Surgical - The medical device company said it will offer shares of its common stock in a public offering through Piper Jaffray, but size of the offering was not disclosed. Shares tumbled in extended-hours trading. (Click here for after-hours quote.)

(Read More: CNBC's Market Insider Blog)

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

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