MOST NOTEWORTHY: Micron, China Sunergy and Medtronic were today's noteworthy upgrades:

• Deutsche Bank upgraded shares of Micron (NYSE: MU) to Buy from Hold as they believe improved pricing and the company's cost reductions should drive a strong margin recovery. The firm raised MU's target to $11 from $7.
  
• Jefferies raised China Sunergy (NASDAQ: CSUN) to Hold from Underperform following the company's Q1 beat to reflect its improved outlook for the production of higher efficiency cells and better controls over cash flow measures.
  
• Goldman raised Medtronic (NYSE: MDT) to Buy from Neutral based on potential earnings upside from strong market share and broad distribution.

OTHER UPGRADES:

• UBS upgraded National Fuel Gas (NYSE: NFG) to Buy from Neutral.
  
• Arris (NASDAQ: ARRS) was raised to Outperform from Market Perform at Friedman Billings.
  
• Piper upgraded Central Garden & Pet (NASDAQ: CENT) to Buy from Neutral.

Suntech Power (NYSE: STP) closed at $47.12 Thursday.

STP is scheduled to report Q1 EPS on May 22.

STP June option implied volatility of 80 is above its 26-week average of 73 according to Track Data, suggesting larger price movement.

China Sunergy (NASDAQ: CSUN), a manufacturer of solar cell products in China, closed at $12.58 Thursday.

CSUN is expected to report Q1 EPS on May 20.

Cowen says: "Key issues: Ramp of new cells, expense control, liquidity."

CSUN June option implied volatility of 111 is above its 26-week average of 100 according to Track Data, suggesting larger price risk.

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

MOST NOTEWORTHY: Dreamworks Animation (NYSE: DWA), BlackRock (BLK), Mariner Energy (ME) and Franklin Resources (BEN) and RightNow Technologies (RNOW) were today's noteworthy initiations:

• Stifel expects Dreamworks Animation's (NYSE: DWA) fundamental outlook for film to improve given a more accommodating home entertainment market, while next-gen DVD format adoption and the introduction of 3D exhibition in theaters creates incremental opportunities for film studios. The firm started shares off with a Buy rating.
  
• Wachovia believes BlackRock (NYSE: BLK) is one of the best-positioned managers in both product and geographic perspectives and initiated shares with an Outperform rating.
  
• BMO Capital believes Mariner Energy (NYSE: ME) has a number of catalysts that could push shares higher, but feels current trading levels are not attractive. BMO started shares with a Market Perform rating.
  
• William Blair views Franklin Resources (NYSE: BEN) as a premier global firm with an advantage in many attractive international markets and started shares with an Outperform rating.
  
• Cantor believes RightNow Tech's (NASDAQ: RNOW) transition creates significant execution risk, initiated shares with a Hold rating...

OTHER INITIATIONS:

• China Sunergy (NASDAQ: CSUN) was initiated with a Neutral rating at Cowen.
  
• Banc Of America initiated shares of The Stanley Works (NYSE: SWK) with a Neutral rating.
  
• Yamana Gold (NYSE: AUY) was started with a Buy rating and Credit Suisse.
  
• Deutsche Bank initiated Cree (NASDAQ: CREE) with a Hold rating.

Analyst summaries provided by TheFlyOnTheWall.com (subscription required).

MOST NOTEWORTHY: Oracle Corp (ORCL), Helicos BioSciences (HLCS), Clean Energy Fuels (CLNE) and China Sunergy (CSUN) topped today's noteworthy initiations:

• Benchmark started Oracle Corp (NASDAQ: ORCL) with a Hold rating.

• JP Morgan initiated Helicos BioSciences (NASDAQ: HLCS) with a Neutral rating based on the potential of its single-molecule genetic sequencing platform but noted that commercialization carries near-term risk.

• Hambrecht believes Clean Energy Fuels' (NASDAQ: CLNE) total addressable market is over $20B given the company's focus on natural gas vehicle fuel for return-to-base applications and started shares with a Buy rating.

• Jefferies wants to see China Sunergy (NASDAQ: CSUN) demonstrate that its silicon wafer suppliers can meet aggressive ramping plans before becoming more positive on the stock, starting shares off with a Hold rating...

OTHER INITIATIONS:

• Lehman started Greenlight Capital Re (NASDAQ: GLRE) with an Equal Weight rating.

• Cellcom Israel (NYSE: CEL) and Partner Communications (NYSE: PTNR) were initiated with Buy ratings at Citigroup.

Analyst summaries provided by TheFlyOnTheWall.com (subscription required).