Analyst Upgrades

• Tyson Foods (TSN) to buy from hold at Deutsche Bank.
• Carmike Cinemas (CKEC) to buy from neutral at Merriman.
• Ambow Education (AMBO) to conviction buy from neutral at Goldman.
• Johnson Controls (JCI) to overweight from equal weight at Barclays.
• Dynex Capital (DX) to outperform from market perform at JMP Securities.
• Ensco (ESV) to outperform from neutral at Credit Suisse.
• York Water (YORW) to buy from hold at Brean Murray.
• Mid-America Apartment (MAA) to market perform from underperform at FBR Capital.
• Cheniere Energy Partners (CQP) to hold from sell at Citigroup.
• Forest Oil (FST) to positive from neutral at Susquehanna.
• Tractor Supply (TSCO) to outperform from neutral at RW Baird.

Analyst Upgrades

• Boeing (BA) to overweight from neutral at JPMorgan.
• Alcoa (AA) to buy from hold at Deutsche Bank.
• BP (BP) to outperform from market perform at Raymond James.
• Office Depot (ODP) and Staples (SPLS) to buy from neutral at Janney Capital.
• ON Semiconductor (ONNN) to buy from hold at Citigroup.
• Kennametal (KMT) and Polyone (POL) to buy from hold at KeyBanc.
• Airgas (ARG) to outperform from market perform at William Blair.
• EchoStar (SATS) to neutral from underperform at Macquarie.

Analyst Upgrades

• Susquehanna upgraded Yahoo! (YHOO) to positive from neutral. The firm, which has a $19 price target on the stock, cites the steep decline in shares for the upgrade.
• UBS upgraded Time Warner Cable (TWC) to buy from neutral. The firm believes fears regarding FCC reclassification of broadband are "overblown" and that industry fundamentals are bullish. The firm has a $57 target on the stock.
• Keefe Bruyette upgraded Stifel Financial (SF) to outperform from market perform on valuation following the recent pullback in shares. The firm has a $64 price target for the stock.
• Boeing (BA) was upgraded to conviction buy from neutral at Goldman.
• RBC Capital upgraded Southern Union (SUG) to sector perform from underperform.
• Rubicon Technology (RBCN) was upgraded to outperform from perform at Oppenheimer.

Analyst Upgrades

• Wells Fargo upgraded Norfolk Southern (NSC) to outperform from market perform following the company's Q1 results.
• RBC Capital transferred coverage on Gildan Activewear (GIL) with an outperform from sector perform. The firm is positive on Gildan's low-cost producer strategy and free cash flow generation. The firm raised its target to $35 from $26.
• Wunderlich upgraded Delphi Financial (DFG) to buy from hold following the company's Q1 results and raised its target for shares to $31 from $29.
• Aflac (AFL) was upgraded to buy from neutral at Sterne Agee.
• Time Warner (TWX) was upgraded to outperform from neutral at Cowen.
• Pride International (PDE) was upgraded to outperform from neutral at Credit Suisse.

Analyst Upgrades

• Barclays upgraded Schlumberger (SLB) to overweight from equal weight based on its deep management team, financial strength and increased exploration activity. The firm raised its target to $73 from $64.
• ThinkEquity upgraded SanDisk (SNDK) to buy from hold based on expectations for a solid 2010 with better NAND pricing trends, leaner channel inventories and lack of new fabs slated in 2010, among other reasons. The firm has a $35 target on the stock.
• Keefe Bruyette upgraded Pinnacle Financial (PNFP) to outperform from market perform, citing the company's strong management and balance sheet. The firm has a $16.50 price target on the stock.
• Watson Pharma (WPI) was raised to neutral from underperform at BofA/Merrill.
• New York Times (NYT) was upgraded to market perform from underperform at Wells Fargo.
• Tenet Healthcare (THC) was upgraded to outperform from market perform at Leerink.