Analyst upgrades:

• UBS upgraded Pacific Sunwear (NASDAQ: PSUN) to Neutral from Sell and said liquidity is no longer a near-term concern. The firm lowered Pacific Sunwear's target to $1.50 from $3. Citigroup upgraded shares to Hold from Sell on valuation following the recent weakness and believes Pacific Sunwear has sufficient liquidity to remain a going concern.
  
• Calyon believes Reliant Energy (NYSE: RRI) will be successful in unwinding the Merrill Lynch Retail credit sleeve and obtaining alternative collateral. The firm upgraded shares to Buy from Add.
  
• JP Morgan said Cogent's (NASDAQ: COGT) position in homeland security and the defense markets make it less sensitive to an economic downturn, making valuation attractive. JP Morgan upgraded shares to Overweight from Neutral and raised its target to $13 from $10.50.
• Goldman added Research in Motion (NASDAQ: RIMM) to its Conviction Buy List and removed Riverbed (NASDAQ: RVBD) from the Conviction Sell List.
  
• J.M. Smucker (NYSE: SJM) was raised to Buy from Underperform at Merrill Lynch.

MOST NOTEWORTHY: Blockbuster Inc (BBI), Molson Coors Brewing Co (TAP), Illumina, Inc (ILMN), and ARM Holdings plc (ARMHY) were today's more noteworthy upgrades:

• Citigroup upgraded Blockbuster Inc (NYSE: BBI) to Buy from Hold based on valuation, improving box office visibility and their belief that the lower-priced online-only rental product will help improve costs.

• Molson Coors Brewing (NYSE: TAP) was upgraded to Buy from Neutral at UBS based on valuation, volume strength and pricing.

• Matrix believes strong demand for genetic analysis equipment is boosting profits for Illumina (NASDAQ: ILMN), upgrading shares to Strong Buy from Sell; Matrix sees upside to their Intrinsic Value Calculation of $50/share.

• ARM Holdings (NASDAQ: ARMHY) was upgraded to Overweight from Underweight at JP Morgan to reflect the strength in the high-end handset market...

OTHER UPGRADES:

• Bristol Myers Squibb Co (NYSE: BMY) was upgraded to Buy from Hold at Citigroup.

• RBC Capital raised Sapient Corp (NASDAQ: SAPE) to Outperform from Sector Perform.

• Sandler upgraded Chemical Financial Corp (NASDAQ: CHFC) to Hold from Sell.

• UBS raised WESCO International, Inc (NYSE: WCC) to Buy from Neutral.

• Piper Jaffray upgraded shares of Omnicell, Inc (NASDAQ: OMCL) to Outperform from Market Perform.

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