These are this morning’s top day trader and active trader alerts with a brief explanation of the news behind the moves:

Acme Packet, Inc. (NASDAQ: APKT) up 14% at $12.21 on 28,000 shares after earnings.

Adventrx Pharmaceuticals, Inc. (AMEX: ANX) up 4% at $0.33 on 1.2 million shares after appointing Carl Icahn to its Board of Directors.

Alvarion Ltd. (NASDAQ: ALVR) down 6.5% at $4.00 on 16,000 shares after earnings.

Auxilium Pharmaceuticals Inc. (NASDAQ: AUXL) is up 9% at $30.61 on 250,000 shares after the FDA approved hand drug Xiaflex for a hand treatment of Dupuytren’s Contracture.

Ctrip.com International Ltd. (NASDAQ: CTRP) down 8.5% at $30.40 on 18,200 shares after earnings.

GT Solar International, Inc. (NASDAQ: SOLR) up 10.5% at $6.63 on 30,000 shares after beating earnings.

Home Diagnostics, Inc. (NASDAQ: HDIX) up almost 90% at $11.45 on 1.3 million shares on the buyout.

Labopharm Inc. (NASDAQ: DDSS) up 14.9% at $3.00 after it received FDA approval for OLEPTRO to treat major depressive disorders.

Myriad Genetics, Inc. (NASDAQ: MYGN) up 6.96% at $25.65 on 24,000 shares after earnings.

NetLogic Microsystems Inc. (NASDAQ: NETL) up 10.3% at $47.80 on 82,000 shares after beating earnings offering Q1 guidance.

News Corp. (NASDAQ: NWS) up 4.8% at $15.76 on about 14,000 shares after beating earnings.

VeriSign Inc. (NASDAQ: VRSN) -6.9% at $21.79 on 80,000 shares after missing earnings expectations and a downgrade.

Western Union Co. (NYSE: WU) down 7.9% at $17.35 on 149,000 shares after earnings guidance disappointment.

Price snapshots at 8:45 AM EST.

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JON C. OGG
FEBRUARY 3, 2010

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