Analyst Upgrades

• Home Depot (HD) to buy from neutral at Goldman.
• Delta Air Lines (DAL) to buy from neutral at BofA/Merrill.
• Heico (HEI) to outperform from sector perform at RBC Capital.
• Royal Dutch Shell (RDS.A) to outperform from neutral at Credit Suisse.
• MB Financial (MBFI) to outperform from neutral at RW Baird.
• Quest Diagnostics (DGX) to equal weight from underweight at Morgan Stanley.
• Oshkosh (OSK) to neutral from underweight at JPMorgan.
• Volterra (VLTR) and Silicon Laboratories (SLAB) to buy from neutral at Roth Capital.
• Ascena Retail Group (ASNA) to overweight from neutral at Piper Jaffray.
• Cytec Industries (CYT) to buy from hold at Deutsche Bank.

MOST NOTEWORTHY: Today's noteworthy downgrades involved Hilton Hotels Corp (HLT), TransAlta Corp (TAC), Cascade Corp (CAE), Activison (ATVI) and Atheros Communications (ATHR):

• Stifel downgraded Hilton Hotels (NYSE: HLT) to Hold from Buy at Stifel based on the recent acquisition.

• TD Newcrest cut TransAlta (NYSE: TAC) to Sell from Hold and doesn't consider an LBO of the company likely.

• Rodman cut Cascade (NYSE: CAE) to Market Underperform from Market Perform based on valuation.

• Activision (NASDAQ: ATVI) was downgraded to Neutral from Outperform at JP Morgan based on valuation and the competitive environment.

• AG Edwards believes Atheros Communications (NASDAQ: ATHR) has a less favorable risk/reward and cut shares to Hold from Buy...

OTHER DOWNGRADES:

• Needham downgraded Kyphon (NASDAQ: KYPH) to Buy from Strong Buy.

• UBS downgraded Taiwan Semiconductor (NYSE: TSM) to Neutral from Buy.

• Deutsche Bank cut Chicago Mercantile Exchange Holdings (NYSE: CME) to Hold from Buy.

• Roche Holding Ltd (OTC: RHHBY) was downgraded to Hold from Buy at Citigroup.

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