Analyst Upgrades

• Wells Fargo upgraded Norfolk Southern (NSC) to outperform from market perform following the company's Q1 results.
• RBC Capital transferred coverage on Gildan Activewear (GIL) with an outperform from sector perform. The firm is positive on Gildan's low-cost producer strategy and free cash flow generation. The firm raised its target to $35 from $26.
• Wunderlich upgraded Delphi Financial (DFG) to buy from hold following the company's Q1 results and raised its target for shares to $31 from $29.
• Aflac (AFL) was upgraded to buy from neutral at Sterne Agee.
• Time Warner (TWX) was upgraded to outperform from neutral at Cowen.
• Pride International (PDE) was upgraded to outperform from neutral at Credit Suisse.

MOST NOTEWORTHY: Mattel, Volvo, PMI Group, Mosaic and Diamond Foods were today's noteworthy upgrades:

• Oppenheimer upgraded shares of Mattel Inc (NYSE: MAT) to Buy from Neutral citing valuation, strong 2008 product line-up, and expected organic sales growth.
  
• Goldman upgraded shares of Volvo (NASDAQ: VOLV) to Buy from Neutral on valuation as they believe the company's prospects for earnings are not priced into shares. Volvo was added to the firm's Conviction Buy List.
  
• PMI Group's (NYSE: PMI) rating was raised to Outperform from Market Perform at Piper Jaffray on valuation.
  
• Citigroup upgraded shares of Mosaic Company (NYSE: MOS) to Hold from Sell to reflect their increased commodity price forecasts.
  
• Diamond Foods Inc (NASDAQ: DMND) was upgraded to Buy from hold at BB&T Capital on valuation.

OTHER UPGRADES:

• Bear Stearns upgraded Diana Shipping Inc (NYSE: DSX) to Outperform from Peer Perform.
  
• Morgan Stanley upgraded Telephone and Data Systems Inc (NYSE: TDS) to Equal Weight from Underweight.
  
• Targa Resources Partners (NASDAQ: NGLS) was upgraded to Outperform from Market Perform at Wachovia.
  
• Steelcase Inc (NYSE: SCS) was upgraded to Neutral from Sell at Goldman.