Top Percentage Gainers and Losers as of 2pm 4/13/11 (ZOOM, GRM, SLGN, DCTH, SLGN, QTM, NTAP, RVBD, AG, INVE, YUII, CSR, CIGX, MSB, TRGL, STRA)

Best

1) Zoom Technologies (NASDAQ: ZOOM): Trading up 42.9% from yesterday’s close to $4.45. The company acquired new patent licenses from Qualcomm (NASDAQ: QCOM), which will allow the company to develop new mobile phones for the global market. Shares had been up as much as 54% earlier in the session.

2) Graham Packaging Company (NYSE: GRM): Trading up 29.3% from yesterday’s close to $21.62. Silgan Holdings (NASDAQ: SLGN) announced that it will purchase the company for the equivalent of $19.65 per share in cash and stock.

3) Delcath Systems (NASDAQ: DCTH): Trading up 19% from yesterday’s close to $8.64. The company reported that it has received approval to market and sell its Hepatic Chemosat system in Europe.

4) Silgan Holdings (NASDAQ: SLGN): Trading up 15.8% from yesterday’s close to $42.67. Silgan announced that it will be purchasing Graham Packaging Company (NYSE: GRM) for the equivalent of $19.65 in cash and stock.

5) Quantum Corporation (NYSE: QTM): Trading up 15.5% from yesterday’s close to $3.06. The company reached an agreement with NetApp (NASDAQ: NTAP), which will Quantum to use NetApp’s worldwide sales network to sell its software.

Other notable movers

Riverbed Technology (NASDAQ: RVBD): Up 12.23% from yesterday’s close to $34.70.

First Majestic Silver (NYSE: AG): Up 10.28% from yesterday’s close to $22.64.

Worst

1) Identive Group (NASDAQ: INVE): Trading down 34.5% from yesterday’s close to $3.73. A negative article at Seeking Alpha has the stock down. Shares reached a 52-week high in yesterday’s session.

2) Yuhe International (NASDAQ: YUII): Trading down 20.3% from yesterday’s close to $5.31. Shares had started out the day in positive territory.

3) China Security & Surveillance Technology (NYSE: CSR): Trading down 9.5% from yesterday’s close to $4.18. A negative article from The Motley Fool highlighting potential problems regarding the company’s cash flow is taking its toll.

4) Star Scientific (NASDAQ: CIGX): Trading down 9% from yesterday’s close to $3.11. The stock has lost 33.4% over the past seven trading sessions.

5) Mesabi Trust (NYSE: MSB): Trading down 7.8% from yesterday’s close to $35.65. The company declared a lower distribution, $0.05 per unit versus $0.125 per unit, versus the same period last year.

Other notable movers

Toreador Resources (NASDAQ: TRGL): Down 10% from yesterday’s close to $7.79.

Strayer Education (NASDAQ: STRA): Down 7% from yesterday’s close to $124.59.

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