Top Percentage Gainers and Losers as of 3:30pm 4/13/11 (ZOOM, GRM, SLGN, DCTH, QTM, IRBT, SIFY, DGW, INVE, YUII, CSR, TRGL, CIGX, MSB, KNDI, CNIT)

1) Zoom Technologies

: Trading up 39.4% from yesterday's close to $4.32. The company acquired new patent licenses from Qualcomm

, 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

: Trading up 30.7% from yesterday's close to $21.84. Silgan Holdings

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

: Trading up 20% from yesterday's close to $8.71. The company reported that it has received approval to market and sell its Hepatic Chemosat system in Europe. 4) Silgan Holdings

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

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

: Trading up 16.42% from yesterday's close to $3.09. The company reached an agreement with NetApp

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

iRobot

: Up 13.79% from yesterday's close to $35.81. Sify Technologies

: Up 12.47% from yesterday's close to $5.14. Duoyuan Global Water

: Up 9.17% from yesterday's close to $3.62.

1) Identive Group

: 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

: Trading down 19.8% from yesterday's close to $5.34. Shares had started out the day in positive territory. 3) China Security & Surveillance Technology

: Trading down 11.69% from yesterday's close to $4.08. A negative article from The Motley Fool highlighting potential problems regarding the company's cash flow is taking its toll. 4) Toreador Resources

: Trading down 9.9% from yesterday's close to $7.79. Stock has broken to a new six month low in today's session. 5) Star Scientific

: Trading down 8.7% from yesterday's close to $3.13. The stock has lost nearly 34% over the past seven trading sessions.

Mesabi Trust

: Down 8.15% from yesterday's close to $35.50. Kandi Technologies

: Down 6.56% from yesterday's close to $2.28. China Information Technology

: Down 6.61% from yesterday's close to $2.41.