Analyst upgrades:

• Deutsche Bank upgraded Vale SA (NYSE: VALE) to Buy from Hold on expectations the company will benefit from higher realized prices. The firm raised its target on shares to $30 from $23.
• Soleil upgraded Education Management (NASDAQ: EDMC) to Buy from Gradually Accumulate following the company's Q1 results and raised its target on shares to $34 from $32.
• Credit Suisse upgraded Medtronic (NYSE: MDT) to Outperform from Neutral. The firm also added the stock to its Focus List and raised its target on shares to $49 from $41. Credit Suisse believes Medtronic's base business is stabilizing and the stock's risk/reward is compelling.
• Medivation (NASDAQ: MDVN) was upgraded to Buy from Hold at Roth Capital.
• Martha Stewart (NYSE: MSO) was upgraded to Buy from Hold at Morgan Joseph.
• Dominion Resources (NYSE: D) was upgraded to Hold from Underperform at Jefferies.

• Jefferies upgraded MICROS Systems (NASDAQ:MCRS) to Buy from Hold as it believes the company's cost cutting is running ahead of Street expectations. The firm raised its target on shares to $25 from $18.
  
• KeyBanc upgraded Cheesecake Factory (NASDAQ:CAKE) to Buy from Hold. The analyst believes companies will beat EPS estimates given lower commodity costs, focus on cost controls, and reduced drag of inefficient, new restaurants on unit level margins. Additionally, they believe reduced mortgage payments from refinancing will incrementally help traffic.
  
• Keefe Bruyette upgraded First Niagara (NASDAQ:FNFG) to Outperform from Market Perform on valuation following the company's Q1 results. The firm raised its target price to $15.
• American Electric Power (NYSE:AEP) was upgraded to Overweight from Neutral at JP Morgan.
  
• Royal Gold (NASDAQ:RGLD) was upgraded to Sector Performer from Sector Underperformer at CIBC and to Neutral from Underperform at Banc of America/Merrill.
  
• Micron (NYSE:MU) was raised to Overweight from Equal Weight at Barclays.