Top Percentage Gainers and Losers as of 2 p.m. 4/11/2011(TSTY, FLO, GLBC, LVLT, AMMD, ENDP, EFII, IDIX, BAC, SNSS, AFFX, MCP, CYH, QUIK, THC, TDSC, WPRT, SCEI, IRE)

Best

1) Tasty Baking Company (NASDAQ: TSTY): Stock has jumped a resounding 146.58% to $3.96 after Flowers Foods (NYSE: FLO) revealed plans to buy the company for $4 per share in an all-cash arrangement.

2) Global Crossing (NASDAQ: GLBC): Surging 57.09% to $23.25 after Level 3 Communications (NASDAQ: LVLT) announced that it will acquire the company in an all-stock purchase (16 shares of Level 3 common stock for each share of Global Crossing common or preferred). The stock had been up as much as 75% earlier in the session.

3) American Medical Systems (NASDAQ: AMMD): Currently trading higher by 31.93% to $29.47 after agreeing to be acquired by Endo Pharmaceuticals (NASDAQ: ENDP) for $30 a share. The deal is worth 2.9 billion.

4) Electronics For Imaging (NASDAQ: EFII): Enjoying a 16.94% run to $17.53 after boosting first-quarter guidance. CEO Guy Gecht noted “robust demand” in all three of the company’s business segments, mostly in its print servers as well as software products.
5) Idenix Pharmaceuticals (NASDAQ: IDIX): Shares are trading higher by 11.38% to $3.23 after an upgrade from Neutral to Buy at Bank of America-Merrill Lynch (NYSE: BAC).

Other notable movers: Sunesis Pharmaceuticals (NASDAQ: SNSS) up 9.35% to $2.34; Affymetrix (NASDAQ: AFFX) up 7.91% to $5.73; Molycorp (NYSE: MCP) up 5.86% to 71.13 after a price target raise from $74 to $90 by JP Morgan analyst Michael Gambardella.

Worst

1) Community Health Systems (NYSE: CYH): Shares are freefalling 30.69% to $27.87 after being accused of violations of Federal Securities Laws in a lawsuit filed by Tenet Healthcare (NYSE: THC). The stock had traded all the way down to $22.33 earlier in the session.

2) QuickLogic (NASDAQ: QUIK): Stock is currently plunging 17.04% to $4.04 after cutting its first-quarter revenue forecast.

3) Tenet Healthcare (NYSE: THC): Equity continues to slide, taking a 13.11% haircut to $6.56 after filing a lawsuit against Community Health Systems (NYSE: CYH) alleging improper admission of patients in order to garner revenue.

4) 3D Systems (NASDAQ: TDSC): Trading 11.77% to the downside at $49.87. The stock posted a new 52-week high last Friday.

5) Westport Innovations (NASDAQ: WPRT): The stock started out the day in positive territory but has fallen 10.51% to $23.93. JP Morgan (NYSE: JPM) gave the company a Neutral recommendation.

Other notable movers: Sino Clean Energy (NASDAQ: SCEI) down 10.66% to $3.94; The Governor and Company of the Bank of Ireland (NYSE: IRE) down 10.39% to $2.07.