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.

The impressive story continues with Potash Corp. (POT), first discussed here on March 3, 2009, at a price of $80.81.

In November, BHP Billiton (BBL) withdrew its unsolicited proposal to acquire Potash for $130 a share. As outlined in December, Potash is worth a lot more than $130, and the recent move to above $180 confirms the aforementioned.

General Motors (GM) closed up 2% Wednesday, a day after a series of positive reports from banks involved in the company's initial public offering. GM will have a presence at the North American Auto Show beginning on Jan. 10. Overall implied volatility of 31 is at the low end of its one-month range, according to Track Data, suggesting low price movement.

CBOE Volatility Index-VIX closed down 42 cents to 17.06, below its 100-day moving average 21.12.

And so it goes with Potash Corp. (POT). Potash, first discussed here on March 3, 2009, at a price of $80.81, has been through the valuation ringer, of sorts.

In November, BHP Billiton (BBL) withdrew its unsolicited proposal to acquire Potash for $130.

As traders like to say, "No-oo problem. No problem at all." Potash is worth a lot more than one Benjamin plus a third.

Analyst Upgrades

• Dynegy (DYN) was upgraded to buy from neutral at Pritchard.
• Itron (ITRI) was upgraded to neutral from underperform at Macquarie.
• Goldman upgraded Ameren (AEE) to sell from conviction sell.
• Signet Jewelers (SIG) was upgraded to buy from hold at Societe Generale.
• JPMorgan upgraded Synopsys (SNPS) to overweight from neutral.

Analyst Upgrades

• SanDisk (SNDK) was upgraded to outperform from neutral at RW Baird.
• JPMorgan resumed Potash (POT) at overweight, up from neutral.
• Ariba (ARBA) was upgraded to buy from neutral at Roth Capital.
• Cirrus Logic (CRUS) was upgraded to buy from hold at Jefferies.
• Morgan Stanley upgraded Tesoro (TSO) to overweight from equal weight.
• Solarfun Power (SOLF) was upgraded to buy from hold at Auriga.
• Barclays upgraded Ciena (CIEN) to overweight from equal weight.
• Optimer Pharm (OPTR) was upgraded to outperform from market perform at JMP Securities.
• Argo Group (AGII) was upgraded to outperform from market perform at FBR Capital.
• BofA/Merrill upgraded Green Mountain (GMCR) to buy from underperform and Southern Company (SO) to neutral from underperform.

Analyst Upgrades

• JPMorgan upgraded Vivus (VVUS) to overweight from neutral.
• Citigroup upgraded Corn Products (CPO) to buy from hold.
• Maxim Integrated (MXIM) was upgraded to outperform from market perform at FBR Capital.
• Cardinal Health (CAH) was upgraded to outperform from neutral at RW Baird.
• Citigroup upgraded Monster Worldwide (MWW) and EchoStar (SATS) to buy from hold, as well as Las Vegas Sands (LVS) to buy from sell.
• BMO Capital upgraded Potash (POT) and Barrick Gold (ABX) to outperform from market perform.

Analyst Upgrades

• HSBC upgraded Massey Energy (MEE) to overweight from neutral based on improved 2011 pricing power given industry supply-side discipline. Despite the upgrade, the firm cuts its price target to $40 from $54.
• Needham upgraded Blue Coat Systems (BCSI) to buy from hold following yesterday's announcement that Michael J. Borman has been named the new CEO. The firm has a $27 price target on the stock.
• Citigroup upgraded Teekay Offshore Partners (TOO) to buy from hold after the company announced shuttle tanker contracts to reflect improved operating performance. The firm raised its target for shares to $26 from $15.
• Prosperity Bancshares (PRSP) was upgraded to equal weight from underweight at Morgan Stanley.
• Ceradyne (CRDN) was upgraded to buy from hold at Benchmark Co.
• CTC Media (CTCM) was upgraded to buy from hold at Deutsche Bank.

Analyst Upgrades

• Wells Fargo upgraded Gap (GPS) to outperform from market perform, citing valuation and expectations for EPS to grow in FY11. The firm thinks consensus estimates are achievable and has a $20 to $22 target valuation range for shares.
• BMO Capital upgraded Abercrombie (ANF) to outperform from market perform and has a $43 target on the stock. The firm believes Abercrombie's domestic business is turning and that the company is beginning to take share from competitors.
• Piper Jaffray upgraded Codexis (CDXS) to overweight from neutral as it believes Shell's (RDS.A) biofuel commercialization plans and a potential carbon capture partnership present near-term catalysts for the stock. The firm upped its target for shares to $12 from $11.
• Tortoise Energy Capital (TYY) and Tortoise Energy (TYG) were upgraded to buy from hold at Wunderlich.
• Comerica (CMA) was upgraded to outperform from neutral at Baird.
• Methanex (MEOH) was upgraded to strong buy from outperform at Raymond James.