Tuesday's Analysts' Upgrades and Downgrades

CHANGE IN RATINGS

Aquantive (AQNT Quote) upgraded at Oppenheimer: AQNT was upgraded from Neutral to Buy, Oppenheimer said. $28 price target. Recent pullback presents a buying opportunity, as the company remains leveraged to the strong online advertising market.

Ashland (ASH Quote) downgraded at JP Morgan: ASH was downgraded from Overweight to Neutral, JP Morgan said. Shares appear fully valued, though the private-market price could be as high as $75. Company will likely pay more special dividends.

American Express (AXP Quote) downgraded at AG Edwards: AXP was downgraded from Buy to Hold, AG Edwards said. $60 price target. Valuation call, plus the outlook for consumer spending and credit quality is murky.

Centene (CNC Quote) downgraded at Goldman Sachs: Goldman said it is downgrading CNC to a Sell rating from Neutral based on valuation. Believe price no longer reflects underlying risk of earnings shortfall. Target price at $22. ...