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

• BMO Capital upgraded Procter & Gamble (PG) to outperform from market perform as it views P&G's valuation as attractive and expects growth to pick up in the March quarter. The firm has a $74 price target for shares.
• Goldman upgraded Tupperware (TUP) to buy from neutral and raised its target for shares to $60 from $48.
• Stifel Nicolaus upgraded Scansource (SCSC) to buy from hold. The firm believes that the company's growth is poised to accelerate, allowing the stock's multiple to expand or even rise slightly. The firm has a $43 target for shares.
• CA Technologies (CA) was upgraded to outperform from sector perform at RBC Capital.
• Brady (BRC) was upgraded to market perform from underperform at BMO Capital.
• Lukoil (LUKOY) was upgraded to overweight from neutral at JPMorgan.

Here are some highlights from this past week's earnings coverage from BloggingStocks:

• Abercrombie & Fitch Inc. (NYSE: ANF) beat Q4 earnings estimates handily, sending shares higher.
• Activision Blizzard Inc. (NASDAQ: ATVI) did well in the holiday period but offered weak guidance.
• Barclays (NYSE: BCS) one-time gains offset write-downs and said it expects to resume dividend payments.
• Boeing Co. (NYSE: BA) shares fell after it announced that it had understated its Q4 and fiscal 2008 loss.
• Coca-Cola Co. (NYSE: KO) topped Q4 earnings estimates due in part to volume gain internationally.
• Diageo (NYSE: DEO) earnings rose in the first half, but it cut its full-year forecast.
• GSI Commerce Inc. (NASDAQ: GSIC) "solid" Q4 results led to an analyst downgrade.