Thursday's Top Percentage Gainers and Losers

Best

1) Caliper Life Sciences (NASDAQ: CALP): Shares of Caliper Life Sciences are currently trading up 41% from yesterday's close to $10.41. The company will be acquired by PerkinElmer (NYSE: PKI) for $10.50 per share. The deal is valued at $600 million.

2) Achillion Pharmaceuticals (NASDAQ: ACHN): Shares of Achillion are currently trading up 17.3% from yesterday's close to $6.65. The company was initiated with an Overweight at Piper Jaffray. There are also rumors that Achillion's CEO has expressed an interest in being acquired by Pharmasset (NASDAQ: VRUS).

3) BSD Medical (NASDAQ: BSDM): Shares of BSD are currently trading up 12.4% from yesterday's close to $3.08. The stock started out the session in neutral territory, but heavy buying volume began pushing shares up at 11:20am.

4) Gramercy Capital (NYSE: GKK): Shares of Gramercy are currently trading up 12.1% from yesterday's close to $3.52. It was reported that Indaba Capital Fund purchased 133,000 shares of Gramercy for $3.13 per share.

5) Silvercorp Metals (NYSE: SVM): Shares of Silvercorp are currently trading up 9.4% from yesterday's close to $8.99. A positive article from Seeking Alpha regarding the company's response to allegations of fraud is lifting shares in today's session.

Other Notable Gainers

Rexx Energy (NASDAQ: REXX): Shares of Rexx are currently trading up 8.9% from yesterday's close to $13.50. SunTrust Robinson Humphrey reported that the company could “be worth over $20 per share” for its exposure to the Utica shale play alone.

Spreadtrum Communications (NASDAQ: SPRD): Shares of Spreadtrum are currently trading up 8.2% from yesterday's close to $19.99. The stock has broken above its 200-day simple moving average (one year daily chart) in today's session. Shares are now trading at a three month high.

Glenco Shipping (NYSE: GNK): Shares of Glenco Shipping are currently trading up 8% from yesterday's close to $7.71. A positive article from SmartMoney regarding shipping companies is seemingly having a positive effect on Glenco, which had started out the session in neutral territory. The stock has gained 87% since hitting a 52-week low on August 8th.

USA Technologies (NASDAQ: USAT): Shares of USA Technologies are currently trading up 7.2% from yesterday's close to $2.08. The stock has broken above both its 50- and 200-day simple moving averages (one year daily chart) in today's session.

Star Scientific (NASDAQ: CIGX): Shares of Star are currently trading up 5.9% from yesterday's close to $2.71. The stock has gained 81.6% since hitting a low of $1.50 on August 26th.

Spartech Corp. (NYSE: SEH): Shares of Spartech are currently trading up 4.5% from yesterday's close to $4.26. The company reported Q3 earnings of $0.10 per share versus a loss of $0.12 per share for the same period last year. Analysts were forecasting earnings of $0.07 per share. Revenue came in at $291.7 million versus estimates of $281.77 million.

Worst

1) G-III Apparel Group (NASDAQ: GIII): Shares of G-III are currently trading down 18% from yesterday's close to $23.50. The company reported Q2 earnings of $0.08 per share versus estimates of $0.20 per share. For fiscal year 2012, the company is forecasting sales of $1.25 billion and earnings of $3.05 to $3.15 per share versus previous guidance of $1.2 billion in sales and earnings of between $3.15 and $3.25 per share.

2) Titan Machinery (NASDAQ: TITN): Shares of Titan are currently trading down 15.3% from yesterday's close to $23.18. The company reported Q2 earnings of $0.30 per share versus estimates of $0.26 per share. Full year guidance came in at sales between $1.330 billion to $1.405 billion versus previous forecasts of $1.310 billion to $1.385 billion.

3) Matrix Service (NASDAQ: MTRX): Shares of Matrix are currently trading down 11.6% from yesterday's close to $10.03. Despite posting a profit in the fourth quarter, the company reported full year guidance below estimates. Matrix forecast full-year earnings of $0.75 - $0.95 per share versus estimates of $0.99 per share.

4) Mind Industries (NASDAQ: MIND): Shares of Mind are currently trading down 10% from yesterday's close to $14.96. The company reported earnings of $0.11 per share versus estimates of $0.13 per share. Revenue came in at $21.3 million versus estimates of $19 million.

5) Quicksilver Resources (NYSE: KWK): Shares of Quicksilver are currently trading down 9.7% from yesterday's close to $8.68. The company was downgraded from Buy to Neutral at UBS.

Other Notable Losers

OpenTable (NASDAQ: OPEN): Shares of OpenTable are currently trading down 9.5% from yesterday's close to $56.81. The stock is being hurt on news that Google (NASDAQ: GOOG) has acquired Zagat, one of OpenTable's main competitors. More on this story can be found here.

Pall (NYSE: PLL): Shares of Pall are currently trading down 9.4% from yesterday's close to $44.21. The company reported Q4 earnings of $0.76 per share versus estimates of $0.86 per share. Jefferies & Co. lowered the stock's price target from $61 to $54. Richard Eastman at Baird also lowered his price target for Pall from $62 to $58.

Men's Wearhouse (NYSE: MW): Shares of Men's Wearhouse are currently trading down 8.6% from yesterday's close to $26.99. The stock is trading down despite a better-than-expected earnings report. The company reported Q2 earnings of $1.11 per share versus estimates of $1.04 per share. Sales came in at $655.5 million versus estimates of $644 million.

Mohawk Industries (NYSE: MHK): Shares of Mohawk are currently trading down 8% from yesterday's close to $44.78. Cleveland Research put out a negative report on the company. There has been significant put activity in Mohawk in today's session.