MOST NOTEWORTHY:

• Citigroup downgraded shares of Acergy (NASDAQ: ACGY) to Sell from Hold as they see risk to the company's backlog and believes the recent share rally is not supported by business operations.
  
• Casey's General (NASDAQ: CASY) was downgraded at Friedman Billings to Underperform from Market Perform citing headwinds that include weak gas comps.
  
• Banc of America downgraded shares of Corinthian Colleges (NASDAQ: COCO) to Neutral from Buy as they believe the post-legislation lending overhang will limit further share upside until COCO can show its students can access federal funds with minimal disruption.

• Bernstein cut EMC Corp (NYSE: EMC) to Market Perform from Outperform.
  
• Baird lowered Woodward Governor (NASDAQ: WGOV) to Neutral from Outperform.
  
• Merrill downgraded Sealed Air (NYSE: SEE) and Bemis (BMS) to Sell from Neutral.

MOST NOTEWORTHY: AstraZeneca, Massey Energy and Freeport McMoRan were today's noteworthy upgrades:

• Dresdner Kleinwort upgraded shares of AstraZeneca (NYSE: AZN) to Buy from Hold following the company's settlement with Ranbaxy on the Nexium patent.
  
• Massey Energy (NYSE: MEE) was raised to Overweight from Neutral at Massey Energy citing the company's leverage to metallurgical coal prices in 2009.
  
• Freeport McMoRan (NYSE: FCX) was upgraded at HSBC to Overweight from Neutral on valuation.

OTHER UPGRADES:

• Arcelor Mittal (NYSE: MT) was upgraded to Buy from Hold at Citigroup.
  
• Merrill upgraded Bernis (NYSE: BMS) to Neutral from Sell.