Analyst upgrades:

• Societe Generale upgraded shares of Veolia Environment (NYSE: VE) to Buy from Hold as they believe the company's new finance chief implement additional cost savings.
  
• Citigroup upgraded shares of Sun Healthcare (NASDAQ: SUNH) to Buy from Hold and added the stock to their Top Picks Live List as they believe the market is pricing in a more severe Medicaid and Medicare reimbursement outlook than is probable. The firm has a $14 target on the stock.
  
• Calyon believes in 2010, American Express (NYSE: AXP) will have easy comps, reserve releases, and income statement leverage. The firm upgraded shares to Outperform from Underperform.
• Societe Generale (OTC: SCGLY) was upgraded to Buy from Hold at Citigroup.
  
• Caterpillar (NYSE: CAT) was raised to neutral from Sell at UBS.
  
• Goldman upgraded Biogen Idec (NASDAQ: BIIB) to Buy from Neutral and added shares to the Conviction Buy List; Goldman also added Bristol-Myers (NYSE: BMY) to the Conviction Buy List.

Analyst upgrades:

• Citigroup upgraded Bristol-Myers (NYSE: BMY) to Buy from Hold. Citigroup upgraded shares on their belief the company has one of the best three year growth rates among peers.
  
• Rio Tinto (NYSE: RTP) was upgraded to Buy from Underperform at Merrill Lynch. Merrill upgraded Rio Tinto following the company's debt repayment plan announcement.
  
• Credit Suisse upgraded Societe Generale (OTC: SCGLY) to Outperform from Neutral. Credit Suisse upgraded shares on valuation.
  
• Alberto-Culver (NYSE: ACV) was added to Conviction Buy List; maintain Buy at Goldman.
  
• American States Water Co. (NYSE: AWR) was upgraded to Buy from Hold at Jesup & Lamont.
  
• Hawaiian Electric (NYSE: HE) was upgraded to Outperform from Neutral at RW Baird.

Analyst downgrades:

MOST NOTEWORTHY: Northrop Grumman, Groupe Danone and MercadoLibre were today's noteworthy upgrades:

• Oppenheimer upgraded shares of Northrop Grumman (NYSE: NOC) to Outperform from Perform after the Pentagon selected the company over Boeing (NYSE: BA) for the newly designated KC-45A Aerial Refueling Tanker with a potential value of $35B.
  
• Citigroup upgraded shares of Groupe Danone (OTC: GDNNY) to Buy from Hold on valuation, as they believe the sell-off on commodity cost concerns is overdone.
  
• MercadoLibre (NASDAQ: MELI) was raised to Outperform from Sector Perform at RBC Capital, as they believe MELI's long-term thesis is more compelling now vs. six months ago and notes favorable reaction to Mercado Pago v2.0.

OTHER UPGRADES:

• Goldman upgraded Societe Generale (OTC: SCGLY) to Neutral from Sell.
  
• Jefferies upgraded Exelon (NYSE: EXC) to Buy from Hold.
  
• Deutsche Telekom (NYSE: DT) was raised to Neutral from Underweight at JP Morgan.

MOST NOTEWORTHY: Pfizer, Dell, Quest Diagnostics, and Societe Generale were today's noteworthy upgrades:

• Lehman upgraded Pfizer (NYSE: PFE) to Equal Weight from Underweight on valuation.
  
• Friedman Billings raised Dell (NASDAQ: DELL) to Outperform from Market Perform, citing expectations for improved margins next quarter, and valuation.
  
• Quest Diagnostics (NYSE: DGX) was upgraded to Outperform from Neutral by Credit Suisse, which cited valuation.
  
• Lehman upgraded shares of Societe Generale (OTC: SCGLY) to Overweight from Underweight to reflect a potential takeover by BNP Paribas and limited downside.

OTHER UPGRADES:

• Bayer (OTC: BAYRY) was raised to Overweight from Equal Weight by Lehman.
• Deutsche Telekom (NYSE: DT) was upgraded to Hold from Sell by Citigroup.
• Public Storage (NYSE: PSA) was raised to Buy from Hold by Deutsche Bank.
• UBS raised Entergy (NYSE: ETR) to Buy from Neutral.