Mid-Day Top Percentage Gainers and Losers As Of 12pm 4-11-11 (TSTY, FLO, GLBC, LVLT, AMMD, ENDP, EFII, YONG, CYH, TCH, QUIK, TDSC, THC, CIGX)

Best

1) Tasty Baking Company (NASDAQ: TSTY): Stock has jumped a resounding 145.96% 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 57.91% to $23.37 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 31.97% 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) Electronics For Imaging (NASDAQ: EFII): Enjoying a 16% run to $17.39 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) Yongye International (NASDAQ: YONG): Getting a 10.66% boost to $5.40 after reporting better-than-expected first-quarter sales due to heavy demand.

Worst

1) Community Health Systems (NYSE: CYH): Shares are building on earlier losses, currently down 25.88% to $19.91 after being accused of violations of Federal Securities Laws in a lawsuit filed by Tenet Healthcare (NYSE: TCH).

2) QuickLogic (NASDAQ: QUIK): Stock is currently plunging 16.22% to $4.08 after cutting its first-quarter revenue forecast.

3) 3D Systems (NASDAQ: TDSC): Trading 12.7% to the downside at $49.34. The stock posted a new 52-week high last Friday.

4) Tenet Healthcare (NYSE: THC): Equity continues to slide, taking a 12.05% hit to $6.64 after filing a lawsuit against Community Health Systems (NYSE: CYH) alleging improper admission of patients in order to garner revenue.

5) Star Scientific (NASDAQ: CIGX): Currently down 9.93% to $3.63. The stock has dropped nearly 30% since last Monday.