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Friday's biggest gaining and declining stocks

CHICAGO (MarketWatch) -- Here are some of Friday's biggest gaining and declining stocks:

Gainers

Baker Hughes Inc. (BHI) shares added 9.2% after the Houston energy-services firm reported that second-quarter net income rose 30% on 12% higher revenue.

Fidelity Bancorp Inc. (FSBI) shares soared 65%. The company agreed to be bought by West Virginia-based WesBanco Inc. (WSBC) for $70.8 million.

Onyx Pharmaceuticals Inc. (ONXX) rallied 12% after the U.S. Food and Drug Administration approved the company's Kyprolis treatment for patients with multiple myeloma who have received at least two prior lines of therapy.

SanDisk Corp. (SNDK) shares rose 10%. The company said late Thursday that second-quarter earnings plummeted as the flash memory maker saw much weaker sales and margins, but management projected results should show improvement in the second half.

Decliners

Cepheid(CPHD) shares fell 18% after the company reported that second-quarter earnings fell 38%.

Shares of Chipotle Mexican Grill Inc. (CMG) fell 22% after issuing a second-quarter earnings report late Thursday that reflected a slowdown in customer traffic growth.

Freescale Semiconductor Ltd. (FSL) shares fell 6.5% after the company issued a current-quarter sales outlook below Wall Street estimates.

Gold Resource Corp. (GORO) shares fell 31%. Late Thursday, the company reported earnings for the second quarter and troubled investors with news of less-than-expected gold output in the quarter. It also revised its production outlook.