Wednesday’s biggest gaining & declining stocks

NEW YORK (MarketWatch) � Shares of the following companies made notable moves in Wednesday�s U.S. stock market:

Advancers

AOL Inc. AOL � shares gained 9.6% after the operator of Internet portals reported the pace of its revenue declines stabilized in the fourth quarter.

Aspen Technology Inc. AZPN � shares added 12.6% after the maker of software used by oil and chemical firms reported second-quarter earnings that beat estimates.

Broadcom Corp. BRCM � rallied 8% after the semiconductor company late Tuesday reported fourth-quarter profit that exceeded expectations.

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Corinthian Colleges Inc. COCO � shares jumped 36% after the educator projected a strong third quarter.

Cytec Industries Inc. CYT � rose 14.7% a day after the reinforced-plastics maker said it hired JPMorgan Chase & Co. to explore its options for separating its coating resin business.

Dendreon Corp. DNDN � shares rose almost 5% after the drug developer named John Johnson, an executive at Savient Pharmaceuticals Inc. SVNT as its new president and CEO. Shares of Savient fell 10.7%.

Fortinet Inc. FTNT � shares rose almost 10% a day after the maker of network-security systems reported fourth-quarter earnings that beat estimates.

IAC/InterActiveCorp. IACI � shares climbed 6.3% after the operator of websites including Ask.com and Match.com reported a fourth-quarter profit that beat analysts� estimates.

Lynas Corp. LYSCF � U.S.-listed shares leapt 15.5%. Bloomberg attributed the rise to the Australian miner getting a temporary operating license to start work in Malaysia.

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ManpowerGroup MAN � shares surged 14.3% after the staffing company reported fourth-quarter results that topped estimates.

Marathon Petroleum Corp. MPC � advanced 9.6% after the refiner said it might spin off some assets and would repurchase as much as $2 billion of its shares. The company also reported fourth-quarter results.

Medivation Inc. MDVN � shares gained 22% after researchers on Tuesday reported the drug developer�s experimental prostate treatment yielded positive results.

Morgan Stanley MS � shares gained nearly 4% after Bloomberg cited four people familiar with the matter in reporting social-networking service Facebook Inc. had picked the securities firm to lead its planned initial public offering.

Whirlpool Corp. WHR � shares leapt 13.5% after the household-appliance maker projected 2012 earnings that beat analysts� consensus estimates.

Decliners

Amazon.com Inc. AMZN �shares fell almost 8% a day after the online retailer reported fourth-quarter revenue below Wall Street estimates and warned of a coming quarterly loss. Read more on Amazon�s shortfall and lackluster outlook.

AMR Corp. AAMRQ � shares fell more than 13% after the bankrupt parent of American Airlines reportedly planned to cut thousands of jobs.

C.H. Robinson Worldwide Inc. CHRW � shares shed 7% after the transportation-services provider reported fourth-quarter earnings short of expectations.

JDAS Software Group Inc. JDAS � shares declined more than 17% after the maker of retail software said it received a notice from the U.S. Securities and Exchange Commission requesting accounting-related information.

Hudson Valley Holding Corp. HVB � shares lost almost 19% after the provider of commercial-banking services reported fourth-quarter earnings below estimates.

Quicksilver Resources Inc. KWK � shares declined 6% after Bank of America Corp. downgraded the oil-and-gas producer to underperform from buy.