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Advancers

Amerigroup Corp.  (AGP) shares gained 8.9% after the insurer reported a quarterly profit that topped expectations.

Aruba Networks Inc.  (ARUN ) shares advanced almost 12% after the builder of wireless networks posted quarterly results that exceeded Wall Street's estimates.

Charles Schwab  (SCHW) shares rose 5.2% after Goldman Sachs raised its view of discount brokers.

GFI Group Inc.  (GFIG ) shares added more than 15% after the derivatives and securities dealer forecast revenue growth in the first quarter.

Huntsman Corp.  (HUN ) shares jumped 6.4% after the chemical company reported adjusted earnings that topped expectations.

Intuit Inc.  (INTU ) shares gained 7.9% after the maker of tax-preparation software hiked its 2010 revenue and profit forecast.

J.C. Penney  (JCP) shares gained 6.6% after the department-store operator reported a better-than-anticipated quarter and 2010 sales forecast.

Peco II Inc.  (PIII) shares jumped 44% to $5.74 after the telecommunications power systems company said it had agreed to be acquired by Lineage Power Holdings Inc. for $5.86 a share.

Sapient Corp.  (SAPE ) shares were up 9% after the technology consulting firm reported quarterly revenue that topped estimates.

Smith International Inc.  (SII ) shares gained 13% on a Wall Street Journal report that the oil-services company may be acquired by Schlumberger Ltd.  (SLB )

Sprint Nextel Corp.  (S ) shares were ahead 5.4%.

Taser International Inc.  (TASR ) shares added 8.7% after the electric-shock weapons maker tallied quarterly results ahead of Wall Street's estimates.

WebMD Health Corp.  (WBMD ) shares rose 6.4% after the online provider of medical information forecast 2010 earnings above Wall Street's expectations.

Decliners

Apollo Group Inc.  (APOL ) shares fell 7.4% after the for-profit education firm offered a soft forecast for the second quarter.

ARYx Therapeutics Inc.  (ARYX) shares were down 48% after the biopharmaceutical company said it had hired an adviser to explore its options.

Canadian Solar Inc.  (CSIQ ) shares declined almost 16% after the solar power cell manufacturer cut its fourth-quarter estimate for gross margin.

Capstone Turbine Corp.  (CPST ) shares lapsed 7.3% to $1.15 after the turbine systems maker priced 38.1 million shares in a public offering at $1.05 each.

Dell Inc.  (DELL ) shares fell 6.7% after the seller of personal computers reported a gross quarterly margin under expectations. 

Energy Solutions Inc.  (ES ) shares fell more than 18% after the nuclear services company said its chairman and CEO Steve Creamer had resigned.

First Solar Inc.  (FSLR ) shares were down 8.2% after the company, which produces cells that turn sunlight into energy, offered a disappointing outlook.

Merit Medical Systems Inc.  (MMSI ) shares dropped more than 17% after the medical-device maker reported quarterly earnings that fell under expectations.

Nanometrics Inc.  (NANO ) shares declined 7.4% after the manufacturer of semiconductor gears reported quarterly revenue under Wall Street's expectations.

Salix Pharmaceuticals Inc.  (SLXP ) shares slid 9% after the company's findings on new uses for its Xifaxan drug were questions by the staff of U.S. regulators.

Telvent Git SA 

shares were down more than 12% after the Spanish information tech firm offered a 2010 forecast under analysts' expectations.