SunPower (SPWRA) saw an increase of more than 10% in its stock price on March 15. This trend was seen across almost all companies in the solar industry, including SunPower's competitors FirstSolar (FSLR), SuntechPower (STP), and Yingli Green Energy (YGE).

Our price estimate for SunPower's stock is at $14.41, about 10% below its current market price.

Analyst Upgrades

• Yingli Green (YGE) to outperform from market perform at Wells Fargo.
• National Semiconductor (NSM) to outperform from market perform at FBR Capital.
• DuPont (DD) to buy from hold at Citigroup.
• Blackboard (BBBB) to overweight from neutral at JPMorgan.
• Kindred Healthcare (KND) to buy from hold at Jefferies.
• Peabody Energy (BTU) to outperform from market perform at BMO Capital.
• Savvis (SVVS) to buy from neutral and InterActiveCorp (IACI) to neutral 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

• 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.

Yingli Green Energy (YGE) took the earnings stage this morning, with the alternative energy issue swinging to a second-quarter profit of $32.1 million, or 21 cents per American depositary share (ADS). Excluding items, earnings arrived at 25 cents per share, exceeding analysts' expectations for a profit of 19 cents per share. Revenue for the quarter climbed 81% to $398.1 million, topping Wall Street's forecast of $371 million.

Gross margin also improved, expanding to 33.5% from 19.8% on a year-over-year basis. For the full year, YGE hiked its gross margin target to a range between 28% and 30%.

Analyst upgrades:

• UBS upgraded Salesforce.com (CRM) to Buy from Neutral based on positive feedback on the Chatter product and increasing confidence the company can beat FY11 guidance. The firm raised its price target to $111 from $90.
• Leerink upgraded Vivus (VVUS) to Outperform from Market Perform. The firm believes Qnexa issues raised by the FDA are labeling and marketing issues, and not approval issues. The firm expects a positive panel vote for Qnexa.
• Goldman upgraded AK Steel (AKS) to Buy from Netural citing lower iron ore prices. The firm has a $17 price target on the stock.
• Kinder Morgan Energy (KMP) was upgraded to Equal Weight at Morgan Stanley.
• Shire (SHPGY) was upgraded to Outperform from Neutral at Credit Suisse.
• Canadian National (CNI) was upgraded to Outperform from Market Perform at Raymond James.

Analyst Upgrades

• Janney Montgomery upgraded Microsoft (MSFT) to buy from neutral with a $30 price target, citing valuation and expectations for strong Q4 results.
• UBS upgraded SanDisk (SNDK) to buy from neutral based on favorable pricing and mobile design win momentum. The firm raised its target to $55 from $46.
• BMO Capital upgraded Medtronic (MDT) to outperform from market perform based on valuation and its product pipeline. The firm has a $48 price target on the stock.
• Lorillard (LO) and Qualcomm (QCOM) were upgraded to conviction buy from buy at Goldman.
• Monsanto (MON) was upgraded to buy from hold at Citigroup.
• FedEx (FDX) was upgraded to buy from hold at BB&T.

Below are some highlights from this past week's earnings coverage on BloggingStocks. Click through to the original posts for more details.

• Ann Taylor Stores Corp. (ANN) shares rallied on heavy volume after it posted better-than-expected Q1 earnings.
• AutoZone Inc. (AZO) Q3 earnings easily beat consensus expectations and same-store sales rose sharply.
• Borders Group Inc. (BGP) posted a wider operating loss, decreasing gross margin, and a same-store sales decline.
• Campbell Soup Co. (CPB) posted strong Q3 results and offered guidance, boosting shares on a down-market day.
• Costco Wholesale Corp. (COST) posted better-than-expected Q3 results, due in part to a surge in membership sales.

Yingli Green Energy (YGE - option chain) shares are rising today after the company reported earnings this morning, posting a profit of $28 million, or 18 cents per share. Excluding one-time items, YGE earned 23 cents per share on revenue of $358 million. Analysts had forecast a profit of 22 cents per share on revenue of $353 million. If you think that the stock won't fall by too much in the coming months, then now could be a good time to look at a bullish hedged trade on YGE.

YGE opened this morning at $9.85. So far today the stock has hit a low of $9.66 and a high of $10.11. As of 12:150, YGE is trading at $9.85 up 0.28 (2.9%). The chart for YGE looks bearish.

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

• Abercrombie & Fitch Co. (ANF) lower Q3 results still topped expectations and sent shares higher.
• Applied Materials Inc. (AMAT) posted much better-than-expected Q4 earnings, the first profit in a year.
• AstraZeneca (AZN) received an analyst's downgrade due to concerns over its earnings prospects.
• Blackstone Group (BX) received an analyst's upgrade following the company's Q3 results.
• Blockbuster Inc. (BBI) widened its net loss in Q3 and revenue and same-stores sales declined.
• Clean Energy Fuels Corp. (CLNE) shares declined after its Q3 numbers fell short of expectations.
• Consolidated Water Co. Inc. (CWCO) earnings prospects for 2010 earned it an analyst upgrade.

Yingli Green Energy (YGE) traded sharply higher Friday in the wake of its third-quarter results. The solar issue reported that its quarterly earnings contracted 18% to $17.7 million, or 12 cents per American depositary share (ADS). Excluding items, such as stock compensation, earnings weighed in at 18 cents per ADS. Revenue for the period edged 0.7% higher to arrive at $325.9 million.

Ahead of the report, analysts were looking for a profit of 16 cents per ADS on $331 million in revenue. Despite the revenue miss, YGE surged into the black right out of the gate. In addition to the stronger-than-expected profit number, traders were no doubt enthused by an 80% jump in shipments from second-quarter levels.

Yingli Green Energy (NYSE: YGE) closed at $11.74. YGE is scheduled to report Q2 EPS today. YGE August 12 straddle is priced at $1.65, September 12 straddle is priced at $2.90. YGE September option implied volatility of 100 is above its 26-week average of 91, according to Track Data, suggesting larger price movement.

Anadarko Petroleum (NYSE: APC) closed at $50.46. Crude oil futures are recently up 0.61% to $68.70 according to Bloomberg. APC September option implied volatility is at 40, November is at 41; below its 26-week average of 51, according to Track Data, suggesting decreasing price movement.

Options Update: Option Update is provided by Stock Specialist Paul Foster of theflyonthewall.com

Today had all the earmarks in line for another solid day of sell-offs, yet the markets held ground considering the tone this morning. The good news was low inflation, the lowest in over 50 years.

But agriculture stocks were hammered on overseas competitive news about weak pricing and demand. Then came a banking downgrade from the S&P playing catch-up. Despite the mixed performance at the end of the day, this felt like a win. Here are the unofficial closing bell levels:

DJIA: 8,497.18 (-7.49)
S&P 500: 910. 71 (-1.26)
NASDAQ: 1,808.06 (+11.88)

Top Analyst Calls

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.

MOST NOTEWORTHY: Tesoro, Yingli Green Energy and Ensco were today's noteworthy upgrades:

• Deutsche Bank upgraded shares of Tesoro (NYSE: TSO) to Hold from Sell as they believe bankruptcy is not a "major danger" after meeting with management and that recent raise in indebtedness was due to rising working capital requirements combined with negative gasoline cracks.
  
• Citigroup raised Yingli Green Energy (NYSE: YGE) to Buy from Hold following the recent weakness to reflect the company's margin improvement and better visibility into 2009.
  
• Calyon upgraded shares of Ensco (NYSE: ESV) to Add from Neutral as they believe the company's increasing exposure to the deepwater market will drive earnings growth. The firm raised their target to $85 from $74.

OTHER UPGRADES:

• Petrohawk Energy (NYSE: HK) was upgraded at Lehman to Overweight from Equal Weight.
  
• Keefe Bruyette raised Sovereign Bancorp (NYSE: SOV) to Outperform from Market Perform.
  
• Tractor Supply Co (NASDAQ: TSCO) was raised to Buy from Neutral at UBS.