Top Percentage Gainers and Losers as of 12pm 7/5/11

Best

1) Immucor (NASDAQ: BLUD): Shares of Immucor are currently trading up 30.2% from Friday's close to $27.00. The company has agreed to be acquired by TPG Capital for $27 per share in cash. The deal is valued at $1.97 billion.

2) Coffee Holding (NASDAQ: JVA): Shares of Coffee Holding are currently trading up 14.0% from Friday's close to $20.00. The stock began the day in neutral territory, but heavy buying volume began pushing shares higher at 9:45am. Shares have gained 454% year-to-date.

3) Rediff.com India (NASDAQ: REDF): Shares of Rediff.com are currently trading up 13.2% from Friday's close to $10.60. A report highlighting India's booming Internet market was published by Barron's over the weekend. The article can be found here.

4) Noah Holdings (NYSE: NOAH): Shares of Noah are currently trading up 11.8% from Friday's close to $13.95. The stock has broken above its 50-day simple moving average (one year daily chart) in today's session. Shares have gained 37% over the past seven trading sessions.

5) Zalicus (NASDAQ: ZLCS): Shares of Zalicus are currently trading up 10.8% from Friday's close to $2.59. The company was initiated with an Outperform by Oppenheimer. The target price was set at $4. The stock has broken above its 50-day simple moving average (one year daily chart) in today's session.

Other Notable Gainers

Silvercorp Metals (NYSE: SVM): Shares of Silvercorp Metals are currently trading up 10.6% from Friday's close to $10.05.

China TechFaith Wireless Communication Technology (NASDAQ: CNTF): Shares of China TechFaith are currently trading up 10.1% from Friday's close to $4.27.

ZAGG (NASDAQ: ZAGG): Shares of ZAGG are currently trading up 9.6% from Friday's close to $14.09.

Worst

1) Zion Oil & Gas (NASDAQ: ZN): Shares of Zion Oil & Gas are currently trading down 16.8% from Friday's close to $4.91. The company announced that there is “little chance” that its well in Israel contains commercially viable hydrocarbons. The stock has broken below its 50- and 200-day simple moving averages (one year daily chart) in today's session.

2) NetScout Systems (NASDAQ: NTCT): Shares of NetScout Systems are currently trading down 15.7% from Friday's close to $17.85. The company forecasted Q1 revenue of $62 to $64 million versus analyst estimates of $71.59 million. NetScout also lowered its full year outlook and said it will begin implementing “expense reductions.”

3) Advanced Energy Industries (NASDAQ: AEIS): Shares of Advanced Energy are currently trading down 12.1% from Friday's close to $13.20. The company forecasted Q2 revenue of $137 - $140 million versus analyst estimates of $153.98 million. Advanced Energy had previously anticipated its Q2 revenue to come in at $160 million.

4) Daqo New Energy (NYSE: DQ): Shares of Daqo New Energy are currently trading down 9.7% from Friday's close to $7.07. The company lowered its Q2 revenue forecast from $92 - 95 million to $70 - $71 million. Daqo cited fewer shipments of wafers, modules, and ASP's as reasons for the cut.

5) The St. Joe Company (NYSE: JOE): Shares of St. Joe are currently trading down 9.1% from Friday's close to $18.96. The company received an informal inquiry notice from the U.S. Securities and Exchange Commission regarding real-estate impairments.

Other Notable Losers

Power-One (NASDAQ: PWER): Shares of Power-One are currently trading down 7.2% from Friday's close to $7.62.

TBS International (NASDAQ: TBSI): Shares of TBS International are currently trading down 6.5% from Friday's close to $2.01.

ValueVision Media (NASDAQ: VVTV): Shares of ValueVision Media are currently trading down 6.8% from Friday's close to $7.68.