Analyst upgrades:

• Wachovia upgraded shares of The Goldman Sachs Group Inc (NYSE: GS) to Outperform from Market Perform on expectations for greater pricing power given Goldman's position as the largest remaining independent securities firm.
• Keefe Bruyette upgraded Investment Technology Group Inc (NYSE: ITG) to Outperform from Market Perform as they believe the company will take market share with the reshaping of the large wire-house brokerage community. The company's target was raised to $37 from $33.
• Broadpoint raised Hoku Scientific Inc (NASDAQ: HOKU) to Buy from Neutral as they believe the contract with Tianwei New Energy reduces financing risk.
• ACE Ltd (NYSE: ACE) and The Travelers Companies Inc (NYSE: TRV) were upgraded to Buy from Neutral at Goldman.
• Axcelis Technologies Inc (NASDAQ: ACLS) was upgraded to Buy from Hold and Evergreen Solar Inc (NASDAQ: ESLR) was lifted to Hold from Sell at Citigroup.

Analyst downgrades:

MOST NOTEWORTHY: Cablevision Systems Corp (CVC), Nasdaq Stock Market Inc (NDAQ), Greenbrier Cos (GBX), Southern Copper Corp (PCU) and Hawaiian Holdings (HA) were today's noteworthy downgrades:

• Oppenheimer downgraded shares of Cablevision Systems Corp (NYSE: CVC) to Neutral from Outperform and does not expect a higher bid to emerge.

• Deutsche Bank downgraded Nasdaq Stock Market Inc (NASDAQ: NDAQ) to Hold from Buy, expecting only modest performance in 2007.

• Matrix cut Greenbrier Cos (NYSE: GBX) to Sell from Hold on the belief that slowing demand for double-stack and forest products rail cars is leading to slowing revenues.

• Credit Suisse downgraded Southern Copper (NYSE: PCU) to Underperform from Outperform based on valuation.

• Goldman cut Hawaiian Holdings (AMEX: HA) to Sell from Neutral based on weak fundamentals and increased liquidity concerns.

OTHER DOWNGRADES:

• Sterne Agee downgraded Blockbuster Inc (NYSE: BBI) to Hold from Buy.

• LoJack Corp (NASDAQ: LOJN) was downgraded to Hold from Buy at Needham.

• Axcelis Technologies, Inc (NASDAQ: ACLS) was downgraded to Sell from Hold at AG Edwards.

• CBL & Associates Properties, Inc (NYSE: CBL) was taken down to Sell from Hold at Citigroup.

• Morgan Stanley downgraded UBS AG (NYSE: UBS) to Underweight from Equal Weight.

Analyst summaries provided by TheFlyOnTheWall.com (subscription required).