Top Percentage Gainers and Losers as of 12:15pm 6/24/11

Best

1) Southern Union (NYSE: SUG): Shares of Southern Union are currently trading up 16.9% from yesterday's close to $39.93. The company has received an acquisition proposal from The Williams Companies (NYSE: WMB) for $39 per share in cash. The deal is valued at 8.7 billion. Southern Union previously had a buyout offer from Energy Transfer (NYSE: ETE) at $33 per share.

2) China Automotive Systems (NASDAQ: CAAS): Shares of China Automotive are currently trading up 15.2% from yesterday's close to $8.65. The stock broke above its 50-day simple moving average (one year daily chart) in today's session. Shares have gained 27% since hitting a 52-week low of $6.63 on May 31st.

3) Oncothyreon (NASDAQ: ONTY): Shares of Oncothyreon are currently trading up 9.1% from yesterday's close to $9.35. The stock is nearing its 52-week high of $9.44, which was set on June 21st.

4) Acura Pharmaceuticals (NASDAQ: ACUR): Shares of Acura Pharmaceuticals are currently trading up 8.2% from yesterday's close to $4.03. The company's new drug, Oxecta, was approved for marketing by the FDA earlier this week.

5) Telestone Technologies (NASDAQ: TSTC): Shares of Telestone Technologies are currently trading up 7.9% from yesterday's close to $6.01.

Other Notable Gainers

Sky-mobi (NASDAQ: MOBI): Shares of Sky-mobi are currently trading up 6.6% from yesterday's close to $8.19. The stock has gained 53% over the past five trading sessions.

Endologix (NASDAQ: ELGX): Shares of Endologix are currently trading up 6.1% from yesterday's close to $9.04. The stock started the session in negative territory, but heavy buying volume began pushing shares up at 11:05am. The stock hit a 52-week high of $9.34 in today's action.

CNinsure (NASDAQ: CISG): Shares of CNinsure are currently trading up 5.8% from yesterday's close to $15.27.

Blackboard (NASDAQ: BBBB): Shares of Blackboard are currently trading up 6.2% from yesterday's close to $43.30.

Worst

1) Pain Therapeutics (NASDAQ: PTIE): Shares of Pain Therapeutics are currently trading down 39.7% from yesterday's close to $5.57. The Food and Drug Administration rejected the company's application for its pain drug, Remoxy. The product is a collaboration between Pfizer (NYSE: PFE), Pain Therapeutics, and Durect (NASDAQ: DRRX).

2) Durect (NASDAQ: DRRX): Shares of Durect are currently trading down 31.7% from yesterday's close to $2.11. The Food and Drug Administration rejected the company's application for its pain drug, Remoxy. The product is a collaboration between Pfizer, Pain Therapeutics, and Durect.

3) STR Holdings (NYSE: STRI): Shares of STR are currently trading down 15.9% from yesterday's close to $14.05. The company reported that it is expecting Q2 revenue of $98 to $101 million versus estimates of $105.63 million. STR forecast earnings of $0.30 to $0.32 versus estimates of $0.40. The company was downgraded from Buy to Accumulate by Craig-Hallum.

4) SuccessFactors (NASDAQ: SFSF): Shares of SuccessFactors are currently trading down 13.6% from yesterday's close to $28.00. The stock broke below its 200-day simple moving average (one year daily chart) in today's session. Shares hit a six month low of $26.63 earlier in the day.

5) Micron Technology (NASDAQ: MU): Shares of Micron Technology are currently trading down 12.4% from yesterday's close to $7.38. The company reported Q3 earnings of $0.07 per share versus estimates of $0.16 per share. Revenue came in at $2.13 billion versus estimates of $2.36 billion.

Other Notable Losers

United Continental Holdings (NYSE: UAL): Shares of United Continental are currently trading down 9.8% from yesterday's close to $22.67.

Brocade Communications Systems (NASDAQ: BRCD): Shares of Brocade Communications are currently trading down 7.2% from yesterday's close to $6.19.

Flowserve International (NASDAQ: FLOW): Shares of Flowserve International are currently trading down 6.8% from yesterday's close to $3.16.

Qihoo 360 Technology (NYSE: QIHU): Shares of Qihoo 360 are currently trading down 6.2% from yesterday's close to $16.88.