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 (NASDAQ:

): Shares are trading up 39.71% to $4.33 after acquiring new patent licenses from Qualcomm (NASDAQ:

). 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 (NYSE:

): Enjoying a 25.13% run to $20.91. Silgan Holdings (NASDAQ:

) announced that it will purchase the company for the equivalent of $19.65 per share in cash and stock. 3) Quantum Corporation (NYSE:

): Equity is ascending 15.09% to $3.05. The company announced that it has come to an agreement with NetApp (NASDAQ:

), which will enable Quantum to sell its software through NetApp's worldwide sales network. 4) Riverbed Technology (NASDAQ:

): 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 (NASDAQ:

): Shares are surging 14.08% to $11.67 after being raised from Underperform to Outperform by Raymond James. Other notable movers: Silgan Holdings (NASDAQ:

): Up 12.35% to $41.38; iRobot (NASDAQ:

): Up 11.12% to $34.97; CEVA (NASDAQ:

): Up 8.72% to $28.19. Worst 1) Identive Group (NASDAQ: 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 (NASDAQ:

): Currently down 12.84% to $5.80. 3) Star Scientific (NASDAQ:

): Shares are down 8.77% to $3.11. The stock has lost 33.4% over the past seven trading sessions 4) Mesabi Trust (NYSE:

): Currently down 6.34%% to $36.20. Shares were down over 12% at one point earlier in the trading day. 5) Toreador Resources (NASDAQ:

): 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 (NASDAQ:

): Down 5.53% to $7.00; Lee Enterprises (NYSE:

): Down 5.3% to $2.86.