Top Percentage Gainers and Losers as of 3:30 p.m. 4/11/2011(TSTY, FLO, GLBC, AMMD, ENDP, CT, EFII, IDIX, MILL, BAC, AFFX, CYH, QUIK, CIGX, THC, BDCO, SCEI, WPRT, IRE, TDSC, GFRE)

Best

1) Tasty Baking Company (NASDAQ: TSTY): Stock is skyrocketing a remarkable 146.58% to $3.96 in today’s action 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 58.51% to $23.46 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 early morning.

3) American Medical Systems (NASDAQ: AMMD): Currently trading higher by 31.97% 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) Capital Trust (NYSE: CT): Has been building upon gains throughout the day, currently up 16.2% to $3.73.

5) 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.
Other notable movers: Miller Petroleum (NASDAQ: MILL) up 11.6% to $5.87 (spike began at 2 p.m. EST); Idenix Pharmaceuticals (NASDAQ: IDIX) up 10% to $3.19 after an upgrade from Neutral to Buy at Bank of America (NYSE: BAC); Affymetrix (NASDAQ: AFFX) up 9.23% to $5.80.

Worst

1) Community Health Systems (NYSE: CYH): Shares are nose-diving 35.11% to $26.16 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 losing 17.25% to $4.03 after cutting its first-quarter revenue forecast.

3) Star Scientific (NASDAQ: CIGX): Sliding 14.89% to $3.43. The stock had put in a 52-week high last Monday, but has lost 33.5% since then.

4) Tenet Healthcare (NYSE: THC): Equity continues to slide, taking a 13.44% hit to $6.54 after filing a lawsuit against Community Health Systems (NYSE: CYH) alleging improper admission of patients in order to garner revenue.

5) Blue Dolphin Energy (NASDAQ: BDCO): The stock started in neutral territory but has fallen 12.32% to $7.19 since 11:30 a.m. EST.

Other notable movers: Sino Clean Energy (NASDAQ: SCEI) down 10.88% to $3.93; Westport Innovations (NASDAQ: WPRT) down 10.40% to $23.96; The Governor and Company of the Bank of Ireland (NYSE: IRE) down 10.61% to $2.06; 3D Systems (NASDAQ: TDSC) down 10.12% to $5.72; Gulf Resources (NASDAQ: GFRE) down 9.72% to $5.11.