CSTR, CSUN, GS, ATHN, APKT, DNDN, SWKS, AEP, SHOO, PWER

Coinstar Inc. (NASDAQ: CSTR) is up 21.17% to $46.30 after posting Q1 earnings that were 8 cents a share higher than Wall Street expected. (NASDAQ:CSTR), ($CSTR)

China Sunergy Co. Ltd. (ADR) (NASDAQ: CSUN) is up 2.65% to $4.65 following strong results for its Q1. (NASDAQ:CSUN), ($CSUN)

Goldman Sachs Group Inc. (NYSE: GS) is down 8.25% to $147.02. Bank of America/Merrill Lynch analysts have downgraded Goldman Sachs from Buy to Neutral, and lowered their price target to $160 from $220. (NYSE:GS), ($GS)

athenahealth Inc. (NASDAQ: ATHN) is down 15.95% to $29.71 following earnings that missed expectations. The company said results were negatively impacted by increased investments, and expenses related to its recent accounting review. (NASDAQ:ATHN), ($ATHN)

Acme Packet Inc. (NASDAQ: APKT) is up 28.05% to $26.98 after reporting quarterly earnings of 16 cents per share, which was 6 cents better than analysts’ estimates. The company also hiked its 2010 outlook. (NASDAQ:APKT), ($APKT)

Dendreon Corp. (NASDAQ: DNDN) is up 12.89% to $56.65 following Thursday’s announcement of FDA approval of Provenge for the treatment of men with advanced prostate cancer. (NASDAQ:DNDN), ($DNDN)

Skyworks Solutions Inc. (NASDAQ: SWKS) is up 7.64% to $17.48 following Q2 results that beat estimates, and a strong forecast for its Q3. (NASDAQ:SWKS), ($SWKS)

American Electric Power Company Inc. (NYSE: AEP) is up 2.75% to $34.77 following a ratings upgrade. Jefferies has upgraded the company to Buy from Hold. (NYSE:AEP), ($AEP)

Steven Madden Ltd. (NASDAQ: SHOO) is up 5.09% to $58.46 on above-average volume. (NASDAQ:SHOO), ($SHOO)

Power-One Inc. (NASDAQ: PWER) is up 39.50% to $8.04 after posting strong results for its first-quarter. Net income came in at $3.8 million, or $0.04 per diluted share, compared to a net loss of $61 million, or $0.70 per share for the same period last year. (NASDAQ:PWER), ($PWER)