(EMAILWIRE.COM, February 16, 2011 ) Montral, Qubec - PennyStockExchange.net (http://Pennystockexchange.net), a premier source for top penny stocks research and publishers of Penny Stock Trader newsletter, issues top stock alert for the following companies (SINA, ROVI, TNGN, NFLX).

SINA Corporation (USA) (NASDAQ:SINA) dropped $4.26 or 4.56% to $89.08 on a volume of 1.86 million shares after Goldman Sachs analyst Catherine Leung cut her rating on stock to Neutral from Buy. The stock has been moving within a range of $32.00-$95.29 over the past 52-weeks. So far in the last six months the stock has surged 109.64%. The stock touched an intraday low and high of $88.66 and $90.68 respectively.

Rovi Corporation (NASDAQ:ROVI) also decreased $3.66 or 5.69% to $60.78 on an unusual volume of 4.75 million shares after Maxim Group downgraded the stock from Buy to Hold. The stock has been moving within a range of $30.28-$69.50 over the past 52-weeks. So far in the last six months the stock has surged 44.60%. The stock touched an intraday low and high of $60.05 and $65.00 respectively.

Tengion, Inc. (NASDAQ:TNGN) plunged $2.57 or 46.73% to $2.93 over an unusual volume of 2.45 million shares compared to a daily average trading of 48,494.00 shares. The company announced that it has been engaged in negotiations with a publicly traded company relating to the acquisition of Tengion through a stock-for-stock merger. As a result of the recent increases in the trading price and volume of Tengion's common stock, Tengion's potential acquirer has terminated merger negotiations.

Netflix, Inc. (NASDAQ:NFLX) dropped $2.14 or 0.89% to $238.65 over 4.30 million shares. The stock has been moving within a range of $63.10-$247.55 over the past 52-weeks. So far in the last six months the stock has surged 73.93%. The stock touched an intraday low and high of $236.34 and $244.89 respectively.

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