Analyst Upgrades

• Citigroup upgraded Baker Hughes (BHI) to hold from sell following the company's Q1 results.
• Auriga upgraded Canadian Solar (CSIQ) to buy from hold as it believes the company's negative preannouncement on April 20 removes a downside catalyst. Despite upgrading, the firm lowered its target for shares to $21 from $25.
• Deutsche Bank upgraded Post Properties (PPS) to hold from sell following the company's Q1 results. The firm upped its target for shares to $27 from $16.
• Wright Express (WXS) was upgraded to buy from neutral at Goldman.
• Nvidia (NVDA) coverage was assumed with a buy from hold at ThinkEquity.
• Elan (ELN) was upgraded to neutral from sell at UBS.

Analyst upgrades:

• Janney Montgomery upgraded Aqua America (NYSE: WTR) to Buy from Neutral on valuation, viewing the recent weakness as a buying opportunity. The firm has a $19 target on the stock.
• UBS upgraded Gildan Activewear (NYSE: GIL) to Buy from Neutral due to customer Broder's improved liquidity and the improved outlook for margins.
• RBC Capital upgraded State Street (NYSE: STT) to Top Pick from Outperform and raised its target to $55 from $40. The analyst said the $2B capital raise addresses TCE ratio concerns and large unrealized losses in the investment portfolio.
• Sherwin-Williams (NYSE: SHW) was upgraded to Overweight from Neutral at JP Morgan.
• Advance Auto Parts (NYSE: AAP) was upgraded to Buy from Underperform at Banc of America/Merrill.
• M&T Bank (NYSE: MTB) was upgraded to Outperform from Market Perform at Bernstein.

MOST NOTEWORTHY: Aerospace stocks, WuXi Pharma, Myriad Genetics, Cypress Bioscience and Knology were today's noteworthy initiations:

• LYON initiated shares of aerospace stocks including Goodrich Corporation (NYSE: GR), TransDigm Group Inc (NYSE: TDG) and Triumph Group Incorporated (NYSE: TGI) with Add ratings and a $74 target, $45 target and $90 target, respectively.
  
• WuXi Pharmatech (NYSE: WX) was started with a Hold rating and $29 target at Jefferies on valuation. JP Morgan started shares with a Neutral rating and Credit Suisse initiated shares with an Outperform rating.
  
• Myriad Genetics Inc (NASDAQ: MYGN) was started with a Hold rating and $50 target at Citigroup, as the firm is cautious on the Phase III Flurizan results and does not recommend putting new money here at these levels.
  
• Citigroup also initiated shares of Cypress Biosciences Inc (NASDAQ: CYPB) with a Buy rating and $22 target as the firm believes Milnacipran has sufficient database for approval and is capable of gaining meaningful market share as firstline therapy.
  
• Knology Inc (NASDAQ: KNOL) was initiated with a Buy rating and $25 target at BWS Financial, as the firm believes the company's growth potential is greater than other cable companies through a business plan that allows it to have operations in all regions of the U.S.

OTHER INITIATIONS:

• Wachovia resumed coverage of Liberty Media Corporation (NASDAQ: LCAPA) with an Outperform rating.
  
• Northwest Airlines Corporation (NYSE: NWA) and Delta Air Lines Inc (NYSE: DAL) were initiated with Overweight ratings at JP Morgan.
  
• Thomas Weisel started shares of Tyco Electronics (NYSE: TEL) with a Market Weight rating.
  
• Goldman initiated shares of Electronic Arts Inc (NASDAQ: ERTS) and Activision Inc (NASDAQ: ATVI) with Buy ratings and THQ Inc (NASDAQ: THQI) with a Neutral rating.