UPGRADES:
Citi upgrades Prudential Financial (NYSE: PRU) from Hold to Buy. Price target slashed from $80 to $30.

Credit Suisse upgrades Toll Bros. (NYSE: TOL) from Underperform to Neutral.

Merrill Lynch upgrades Diamond Offshore (NYSE: DO) from Neutral to Buy.

Merrill Lynch upgrades WellPoint (NYSE: WLP) from Neutral to Buy.

For daily real-time Upgrades go to http://www.streetinsider.com/Upgrades

DOWNGRADES:
Goldman Sachs downgrade China Petroleum & Chemical Corp. (NYSE: SNP) from Buy to Neutral and removed the stock from its Conviction Buy List, citing weaker Chinese demand and potential for fuel-price cuts.

Citi downgrades Limited Brands (NYSE: LTD) to Hold. Price target $9.50.

Morgan Stanley downgrades Cabot Oil