Analyst upgrades:

• Merriman upgraded shares of Netezza (NYSE: NZ) to Buy from Neutral following the company's solid Q2 results as they believe it is well-positioned for strong operating results heading into 2H09.
  
• JP Morgan raised Cabot (NYS: CBT) to Overweight from Neutral. The firm expects 2009 to be a better year given lower raw material costs and higher contract prices.
  
• JP Morgan also upgraded Royal Ahold (OTC: AHONY) to Overweight from Neutral on valuation.
  
• Liberty International (OTC: LBYIY) was upgraded to Hold from Sell at Deutsche Bank.
  
• BMO Capital upgraded Royal Bank (NYSE: RY) to Market Perform from Underperform and Bank of Montreal (NYSE: BMO) to Outperform from Market Perform.

Analyst downgrades:

• Jefferies downgraded shares of Constellation Energy (NYSE: CEG) to Underperform on Hold on concerns the company will come under increasing pressure to issue equity. The firm lowered its target to $60 from $71.
• Thomas Weisel downgraded Williams-Sonoma (NYSE: WSM) to Market Weight from Overweight citing continued macro pressures.
  
• Wachovia has concerns that Kayne Anderson's (NYSE: KED) book value will be pressured by its investment in ProPetro Services, trading losses associated with SemGroup, and negative developments at Quest Midstream. The firm cut shares of Kayne to Market Perform from Outperform.
• Energy Conversion (NASDAQ: ENER) was downgraded to Neutral from Buy at Piper.
  
• Deutsche Bank cut International Paper (NYSE: IP) and Domtar (NYSE: UFS) to Hold from Buy.
  
• H&E Equipment (NASDAQ: HEES) was lowered at Credit Suisse to Neutral from Outperform.

Analyst initiations:

• Morgan Stanley yesterday initiated Elan Corp (NYSE: ELN) with an Overweight rating. The firm sees a low-probability of a Tysabri withdrawal.
  
• ThinkPanmure views On Semiconductor (NASDAQ: ONNN) as a nice turnaround story with opportunities for shares gains in notebooks and consumer gaming platforms. Shares were initiated with a Buy rating and $14 target.
• Petrohawk Energy (NYSE: HK) was assumed with an Outperform rating at Morgan Keegan.
  
• Regency Energy (NASDAQ: RGNC) was initiated at Merrill Lynch with a Neutral rating.

MOST NOTEWORTHY: Overseas Shipholding, Tenet Healthcare and Luxottica were today's noteworthy upgrades:

• Bear upgraded Overseas Shipholding Group (NYSE: OSG) to Outperform from Peer Perform following its Q4 results, citing seasonal strength.
  
• Tenet Healthcare (NYSE: THC) was upgraded to Hold from Underperform at Jefferies after quarterly operating trends showed signs of stabilization.
  
• Goldman raised Luxottica Group (NYSE: LUX) to Buy from Neutral and added shares to their Conviction Buy List as they find the valuation attractive at current levels.

OTHER UPGRADES:

• UBS raised Telefonica (NYSE: TEF) to Buy from Neutral.
  
• Goldman added El Paso Pipeline Partners (NYSE: EPB) to its Conviction Buy List.
  
• Royal Ahold (OTC: AHONY) was upgraded to Buy from Neutral at Merrill Lynch.

MOST NOTEWORTHY: Biogen Idec, Western Union and Tibco were today's noteworthy upgrades:

• Banc of America upgraded shares of Biogen Idec (NASDAQ: BIIB) to Buy from Neutral as they believe the company's three year growth strategy and the approval of Tysabri for the treatment of Crohn's disease will support a higher valuation.
  
• Oppenheimer upgraded Western Union (NYSE: WU) to Outperform from Perform, citing improving operating margins, easing comps, and improvement in Mexico.
  
• Tibco Software (NASDAQ: TIBX) was raised to Buy from Hold at Citigroup. The firm upgraded shares following the acquisition of BEA Systems (NASDAQ: BEAS) to reflect the company's takeout potential and limited downside.

OTHER UPGRADES:

• Royal Ahold (OTC: AHONY) was upgraded to Hold from Sell at Deutsche Bank.
  
• Bear upgraded eBay (NASDAQ: EBAY) to Outperform from Peer Perform.
  
• Morgan Stanley raised Boston Scientific (NYSE: BSX) to Overweight from Equal Weight.

MOST NOTEWORTHY: Adobe, National Oilwell Varco and Cirrus Logic were today's noteworthy upgrades:

• Deutsche Bank upgraded shares of Adobe (NASDAQ:ADBE) to Buy from Hold following the strong Q4 results, as they believe the negative sentiment around the stock creates an attractive entry point.
• Calyon upgraded shares of National Oilwell Varco (NYSE:NOV) to Buy from Add on valuation, as they believe the market's reaction to the Grant Prideco (NYSE:GRP) acquisition was overly negative. They view GRP as a good strategic fit.
• Cirrus Logic (NASDAQ:CRUS) was upgraded to Buy from Hold at Jefferies on valuation, as they believe the risk/reward is attractive.

OTHER UPGRADES:

• Credit Suisse raised its rating on International Paper (NYSE:IP) to Outperform from Neutral.
• JP Morgan upgraded Embarq (NYSE:EQ) to Overweight from Neutral.
• UBS upgraded Royal Ahold (AHONY) to Neutral from Sell.