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)

1) Zoom Technologies (NASDAQ:

): Trading up 42.9% from yesterday's close to $4.45. The company acquired new patent licenses from Qualcomm (NASDAQ:

), 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:

): Trading up 29.3% from yesterday's close to $21.62. Silgan Holdings (NASDAQ:

) announced that it will purchase the company for the equivalent of $19.65 per share in cash and stock. 3) Delcath Systems (NASDAQ:

): 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:

): Trading up 15.8% from yesterday's close to $42.67. Silgan announced that it will be purchasing Graham Packaging Company (NYSE:

) for the equivalent of $19.65 in cash and stock. 5) Quantum Corporation (NYSE:

): Trading up 15.5% from yesterday's close to $3.06. The company reached an agreement with NetApp (NASDAQ:

), which will Quantum to use NetApp's worldwide sales network to sell its software.

Riverbed Technology (NASDAQ:

): Up 12.23% from yesterday's close to $34.70. First Majestic Silver (NYSE:

): Up 10.28% from yesterday's close to $22.64.

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:

): 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:

): 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:

): 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:

): 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.

Toreador Resources (NASDAQ:

): Down 10% from yesterday's close to $7.79. Strayer Education (NASDAQ:

): Down 7% from yesterday's close to $124.59.