MOST NOTEWORTHY: Concur Tech, Groupe Danone and General Motors were today's noteworthy downgrades:

• Piper downgraded shares of Concur Tech (NASDAQ: CNQR) to Neutral from Buy after transferring analyst coverage, as they believe potential upside to estimates is priced into shares while competitive concerns from American Express (NYSE: AXP) are not.
  
• Morgan Stanley downgraded shares of Groupe Danone (OTC: GDNNY) to Equal Weight from Overweight to reflect reduced visibility in the company's core business.
  
• Merrill downgraded General Motors (NYSE: GM) to Underperform from Buy citing the company's deteriorating US auto sales, resulting in a higher cash burn, which could result in a larger than expected capital raise. The firm believes GM capital raise could be in the range of $15 billion and notes that bankruptcy is "not impossible."

OTHER DOWNGRADES:

• Progenics Pharma (NASDAQ: PGNX) was lowered to Underperform from Market Perform at Friedman Billings.
  
• UAL Corp. (NASDAQ: UAUA) was cut to Neutral from Buy at Goldman.
  
• Lehman downgraded Apria Healthcare (NYSE: AHG) to Underweight from Equal Weight at Lincare Holdings (NASDAQ: LNCR) to Equal Weight from Overweight.

MOST NOTEWORTHY: Nokia, Thornburg Mortgage and AbitibiBowater were today's noteworthy upgrades:

• Oppenheimer upgraded shares of Nokia (NYSE: NOK) to Outperform from Perform on valuation following the recent weakness, as their checks indicate demand remains solid. WestLB raised Nokia to Buy from Add on valuation, as they believe concerns about Chinese demand are overdone.
  
• Bear believes Thornburg Mortgage (NYSE: TMA) is much more likely to survive given liquidity from the Fed's Term Securities Lending Facility. Bear upgraded Thornburg to Peer Perform from Underperform.
  
• BMO Capital upgraded AbitibiBowater (NYSE: ABH) to Market Perform from Underperform citing the company's $496M private debt exchange offer.

OTHER UPGRADES:

• JMP raised Cash America (NYSE: CSH) to Outperform from Market Perform.
  
• Veolia Environment (NYSE: VE) was upgraded to Buy from Neutral at Goldman.
  
• Deutsche Bank raised Groupe Danone (OTC: GDNNY) to Buy from Hold.

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: BioScrip, Chipotle Mexican Grill and CoStar Group were today's noteworthy upgrades:

• BioScrip (NASDAQ: BIOS) was raised to Buy from Neutral at Broadpoint, as they believe the company's specialty business is worth more than the current price implies.
  
• Baird upgraded Chipotle Mexican Grill (NYSE: CMG) to Outperform from Neutral following Q4 results, citing valuation and a positive view on fundamentals.
  
• CoStar Group (NASDAQ: CSGP) was upgraded to Outperform from Market Perform at JMP Securities, as they expect the company to report a solid quarter next Thursday.

OTHER UPGRADES:

• Groupe Danone (OTC: GDNNY) was upgraded to Buy from Hold at ING.
  
• UBS raised Senior Housing Properties (NYSE: SNH) and Fluor Corp (NYSE: FLR) to Buy from Neutral.
  
• Morgan Stanley upgraded RenaissanceRE Holdings (NYSE: RNR) to Overweight from Equal Weight.