Analyst Upgrades

• Chesapeake (CHK) to buy from hold at Canaccord.
• Biogen (BIIB) and Regeneron (REGN) to outperform from sector perform at RBC Capital.
• Caribou Coffee (CBOU) to outperform from neutral and Encore Energy (ENP) to neutral from underperform at RW Baird.
• Fluor (FLR) to market perform from underperform at BMO Capital.
• Hornbeck Offshore (HOS) to conviction buy from neutral at Goldman.
• Saks (SKS) and Zale (ZLC) to neutral from underperform at BofA/Merrill.

Analyst upgrades:

• Baird upgraded Tenet Healthcare (NYSE: THC) to Outperform from Neutral and raised its target to $6 from $5 based on cost trends, valuation, and expectations the company can beat expectations over the next six months.
• Oppenheimer upgraded E-House (NYSE: EJ) to Outperform from Perform following the company's better-than-expected Q2 results. The firm has a price target of $27 on shares.
• JPMorgan upgraded Avery Dennison (NYSE: AVY) to Overweight from Neutral and has a $33 target on the stock. The firm cites valuation for the upgrade following the recent underperformance and expects the company's margins to expand as demand rebounds.
• Citigroup (NYSE: C) was upgraded to Buy from Underperform at BofA/Merrill.
• Taubman Centers (NYSE: TCO) was upgraded to Conviction Buy from Buy at Goldman.
• First Niagara (NASDAQ: FNFG) was upgraded to Buy from Neutral at Janney Montgomery.