Cliffs Natural Resources (CLF) is a leading mining and natural resources company in the U.S., and is also the largest producer of iron ore pellets in North America. It competes with other international mining and natural resources companies like Vale, BHP Billiton (BHP) and Rio Tinto (RTP).

Cliffs' North American Iron Ore division accounts for more than two-thirds of the company's total revenue, and around 60% of Cliffs' stock value, by our estimates. Long-term contracts with customers like ArcelorMittal (MT), Algoma and Severstal ensure substantial sales of the firm's mineral produce.

Cliffs Natural Resources (CLF) holds the distinction of being the largest producer of iron ore pellets in North America. It is also a major supplier of direct-shipping lump and fines iron ore out of Australia and is also a significant producer of metallurgical coal. It competes with other international mining and natural resources companies like Vale (VALE), BHP Billiton (BHP) and the Rio Tinto (RIO) group.

We maintain a $103 price estimate for Cliffs Natural Resources stock, roughly 8% ahead of market price.

ArcelorMittal (MT) is currently the largest steel manufacturer in the world, formed by the merger of two steel giants, Arcelor and Mittal in 2006. The company competes with other international Steel giants like BaoSteel, Posco, Nippon Steel and ThyssenKrupp.

Our price estimate for Arcelor Mittal stands at $40.67, roughly 10% above market price.

You may not have felt it yet, but inflation is running rampant for certain commodities. Prices for some raw materials like cotton, oil, aluminum, tin and many others have skyrocketed in the last year. Manufacturers from electronics to apparel are feeling the pain as they report lower earnings due to higher raw materials costs. That can only mean one thing: prices will be going up on many items in the near future or profit margins will be lower, driving down earnings.

If the first scenario plays out, then inflation will start making a comeback as it will take more dollars to buy the same products. That means a semiconductor chip that cost $2.50 last year may cost $2.75 this year. Same chip, just more expensive. Or an all cotton shirt that cost $50 this year will go to $60. Same shirt, just more expensive.

Analyst Upgrades

• Aetna (AET) to buy from neutral at Goldman.
• Kellogg (K) to buy from neutral at UBS.
• PetSmart (PETM) to outperform from market perform at JMP Securities.
• NetApp (NTAP) and Scripps Networks (SNI) to buy from hold at Wunderlich.
• Thoratec (THOR) to buy from hold at Auriga.
• ArcelorMittal (MT) to overweight from neutral at HSBC.
• Bristol-Myers (BMY) to outperform from neutral at Cowen.
• Eaton Vance (EV) to neutral from sell at Ticonderoga.
• Adtran (ADTN) to buy from underperform at BofA/Merrill.

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

• Union Pacific (UNP) and Polycom (PLCM) were upgraded to outperform from market perform at Wells Fargo.
• Time Warner Cable (TWC) was upgraded to outperform from sector perform at RBC Capital.
• Cheesecake Factory (CAKE) was upgraded to neutral from underweight at JPMorgan.
• LaSalle Hotel (LHO) was upgraded to outperform from neutral at RW Baird.
• Graco (GGG) was upgraded to buy from hold at BB&T.
• Valley National (VLY) was upgraded to market perform from underperform at Keefe Bruyette.
• Credit Suisse (CS) was upgraded to hold from sell at RBS.
• U.S. Bancorp (USB) was upgraded to outperform from perform at Oppenheimer.
• Penn National (PENN) and Riverbed (RVBD) were upgraded to buy from hold at Jefferies.
• Goodrich (GR) was upgraded to outperform from neutral at Cowen.
• Amazon.com (AMZN) upgraded to buy from average at Caris.

Analyst Upgrades

• RBC Capital upgraded Suncor (SU) to outperform from sector perform following the Q1 report and FY10 production guidance. The firm has a $46 target on the stock.
• Wells Fargo upgraded Clear Channel Outdoor (CCO) to outperform from market perform. The firm expects the company to report higher-than-expected Q1 revenue and guidance, as it thinks a late cycle ad recovery is occurring.
• Piper Jaffray upgraded Power Integrations (POWI) to overweight from neutral following the company's Q1 results and subsequent sell-off. The firm has a $43 price target for shares.
• ArcelorMittal (MT) was upgraded to buy from hold at ING Group.
• Sapient (SAPE) was raised to conviction buy from buy at Goldman and to buy from hold at Citigroup.
• Powerwave (PWAV) was upgraded to buy from hold at Befferies and to buy from neutral at Merriman.

The editor of The Moneypaper explains, "The pair developed a Net Current Asset Value (NCAV) model to determine if a company was worth its market price. Their formula subtracts all liabilities, including short-term debt and preferred stock, from a company's current asset balance"

Analyst Upgrades

• Oppenheimer upgraded Boeing (BA) two notches to outperform from underperform to reflect, among other things, the company's plans to accelerate 777 and 747-8 production. The firm raised its price target for shares to $80 from $56. Boeing was also upgraded to outperform from neutral at Cowen.
• FBR Capital upgraded Waddell & Reed (WDR) to outperform from market perform on expectations the company will outperform peers. The firm raised its target for shares to $40 from $36.
• Morgan Keegan upgraded Standard Microsystems (SMSC) to outperform from market perform. The firm has increased optimism that the company will benefit from continued strength in the PC end market.
• Genuine Parts (GPC) was upgraded to conviction buy from neutral at Goldman.
• Halozyme Therapeutics (HALO) was upgraded to buy from hold at Brean Murray.
• Medtronic (MDT) was upgraded to buy from hold at Lazard Capital.

Analyst Upgrades

• UBS upgraded Dr Pepper Snapple (DPS) to buy from neutral, citing strong fundamentals and buybacks. The firm raised its target to $42 from $31.
• Piper Jaffray upgraded ProAssurance (PRA) to overweight from neutral. The firm has a $76 price target on shares.
• Hershey (HSY) and Sunoco (SUN) were upgraded to sell from conviction sell at Goldman.
• Level 3 Comm (LVLT) was upgraded to neutral from underweight at JPMorgan.
• Cathay Pacific (CPCAY) was upgraded to buy from hold at Deutsche Bank.

Analyst Upgrades

• Deutsche Bank upgraded Wells Fargo (WFC) to buy from hold as it believes the TARP repayment should remove uncertainty and that the company will report strong Q4 results. The firm raised its target price on shares to $36 from $29. Keefe Bruyette upgraded Wells Fargo to market perform from outperform following the TARP repayment and raised its target on shares to $28 from $24.
• Wells Fargo believes News Corp's (NWS) newspaper and TV station segments are finally outperforming budget, while cable nets continue to perform well. The firm upgraded shares to outperform from market perform and has a $16 to $17 Valuation range.
• BofA/Merrill upgraded Starwood Hotels (HOT) to buy from underperform as they expect "strong cyclical recovery in lodging earnings" in late 2010. The firm raised its target to $40 from $25.
• ArcelorMittal (MT) was upgraded to buy from neutral at UBS.
• JA Solar (JASO) was upgraded to hold from sell at ThinkEquity.
• Acxiom (ACXM) was upgraded to overweight from equal weight at Stephens.