Top Percentage Gainers And Losers As Of 12 p.m. 4/13/2011 (ZOOM, GRM, QTM, NTAP, RVBD, EROC, SLGN, IRBT, CEVA, INVE, YUII, CIGX, MSB, TRGL, ENTR, LEE)

Best 1) Zoom Technologies ZOOM: Shares are trading up 39.71% to $4.33 after acquiring new patent licenses from Qualcomm QCOM. This development will allow the company to develop new mobile phones for the global market. Stock had been up as much as 54% earlier in the session. 2) Graham Packaging GRM: Enjoying a 25.13% run to $20.91. Silgan Holdings SLGN announced that it will purchase the company for the equivalent of $19.65 per share in cash and stock. 3) Quantum Corporation QTM: Equity is ascending 15.09% to $3.05. The company announced that it has come to an agreement with NetApp NTAP, which will enable Quantum to sell its software through NetApp's worldwide sales network. 4) Riverbed Technology RVBD: Stock is up 14% to $35.27 in today's action. The company was upgraded from Perform to Outperform at Oppenheimer. The price target is $40. 5) Eagle Rock Energy Partners EROC: Shares are surging 14.08% to $11.67 after being raised from Underperform to Outperform by Raymond James. Other notable movers: Silgan Holdings SLGN: Up 12.35% to $41.38; iRobot IRBT: Up 11.12% to $34.97; CEVA CEVA: Up 8.72% to $28.19. Worst 1) Identive Group INVE: Stock is freefalling 30.58% to $3.95 despite putting in a new 52-week high in yesterday's trading session. 2) Yuhe International YUII: Currently down 12.84% to $5.80. 3) Star Scientific CIGX: Shares are down 8.77% to $3.11. The stock has lost 33.4% over the past seven trading sessions 4) Mesabi Trust MSB: Currently down 6.34%% to $36.20. Shares were down over 12% at one point earlier in the trading day. 5) Toreador Resources TRGL: Stock is sliding 5.66% to $8.16. The equity's six month low is $8.08 and was set in yesterday's session. Other notable movers: Entropic Communications ENTR: Down 5.53% to $7.00; Lee Enterprises LEE: Down 5.3% to $2.86.