Analyst Upgrades

• B. Riley upgraded Prosperity Bancshares (PRSP) to buy from neutral after the company acquired 19 Texas branches of Missouri-based First Bank. The firm has a $45 price target on shares.
• JPMorgan upgraded Fortinet (FTNT) to overweight from neutral on valuation following the recent pullback in shares. The firm has a $20 price target on the stock.
• Wells Fargo upgraded Lamar Advertising (LAMR) to outperform from market perform. The firm believes the stock's risk/reward ratio is compelling, as its checks indicate that advertising continues to accelerate in Q1.
• Caterpillar (CAT) was upgraded to overweight from underweight at Morgan Stanley.
• SAP AG (SAP) was upgraded to market perform from underperform at FBR Capital.
• BioMarin (BMRN) was raised to buy from hold at Roth Capital.

Analyst Upgrades

• Deutsche Bank upgraded Intercontinental Exchange (ICE) to buy from hold on valuation following the recent pullback in shares. The firm raised its target price on shares to $113 from $108.
• UBS upgraded General Dynamics (GD) to buy from neutral based on improved defense risk profile and stabilization in the business jet market. The firm raised its target to $80 from $70.
• FBR Capital upgraded SunTrust (STI) to outperform from market perform on expectations that regional banks will outperform the large money center banks in this environment. The firm raised its price target on shares to $28 from $22.
• SAP AG (SAP) was upgraded to buy from neutral at BofA/Merrill.
• Thomson Reuters (TRI) was raised to buy from hold at Citigroup.
• Rosetta Resources (ROSE) was upgraded at Wells Fargo to outperform from market perform.

MOST NOTEWORTHY: Lehman Brothers, Nokia and Intuitive Surgical were today's noteworthy initiations:

• Morgan Stanley initiated Lehman Brothers (NYSE:LEH) with an Overweight rating and $31 target. The firm believes Lehman's discount to book value prices in significant write-downs.
  
• Bernstein believes Nokia (NYSE:NOK) will see a slowdown in demand for devices and could loss market share. Shares were initiated with an Underperform rating.
  
• Merriman assumed Intuitive Surgical (NASDAQ:ISRG) with a Neutral rating and believes the tightened credit markets could impact capital equipment spending for small and mid-sized hospitals. They find shares appropriately valued at current levels.

OTHER INITIATIONS:

• Terre Kaufman initiated Terremark Worldwide (NASDAQ:TMRK) with a Buy rating and $8 target.
  
• T-3 Energy (NASDAQ:TTES) was initiated at Jefferies with a Buy rating and $95 target.
  
• Adobe (NASDAQ:ADBE) was assumed with an Outperform rating and $48 target at Friedman Billings.