LDK Solar (NYSE: LDK) is up 16% on news of a new contract with Q-Cells.

Novavax (NASDAQ: NVAX) is trading up 12% on a partnership with GE (NYSE: GE)'s healthcare group.

Hemispherx Biopharma (AMEX: HEB) is off 20% on a terminated license agreement with Esteve.

Red Hat (NYSE: RHT) is moving down almost 4% on a downgrade from Jefferies & Co.

Stocks may trade differently in the pre-market than they do in the regular session.

Douglas A. McIntyre is an editor at 247wallst.com.

MOST NOTEWORTHY: Teva Pharma, Novavax, Corinthian Colleges, Fair Isaac and Tenneco were today's noteworthy upgrades:

• Friedman Billings upgraded Teva Pharmaceutical (NASDAQ: TEVA) to Outperform from Market Perform following Teva's better-than-expected Q3 report and guidance.
  
• Oppenheimer upgraded shares of Novavax (NASDAQ: NVAX) to Buy from Neutral based on positive expectations for Ph I/IIa pandemic influenza data, the start of clinical trials for seasonal influenza, and expected announcement of a vaccine product candidate in Q4.
  
• Corinthian Colleges (NASDAQ: COCO) was upgraded to Buy from Neutral at Merrill following its better-than-expected Q1 report and guidance.
  
• Citigroup upgraded of Fair Isaac (NYSE: FIC) to Buy from Hold shares to reflect the company's strong Q4 results and improved outlook.
  
• Tenneco (NYSE: TEN) was raised to Outperform from Market Perform at Wachovia based on valuation and revenue opportunities in commercial truck market.

OTHER UPGRADES:

• Energizer Holdings (NYSE: ENR) was upgraded at Bear Stearns to Peer Perform from Underperform.
  
• Key Banc upgraded Post Properties (NYSE: PPS) to Hold from Underweight.
  
• Morgan Stanley upgraded MetroPCS (NYSE: PCS) to Overweight from Equal Weight.
  
• William Blair upgraded LECG Corporation (NASDAQ: XPRT) to Market Perform from Underperform.