Acadia Realty Trust (AKR: 16.69 0.00%) upgraded to Outperform from Neutral at Macquarie… Affymetrix (AFFX: 6.44 0.00%) downgraded to Underweight from Equal Weight at Barclays… AstraZeneca (AZN: 47.40 0.00%) upgraded to Neutral from Underperform at Credit Suisse… Baidu Inc (BIDU: 386.49 0.00%) upgraded to Buy from Hold, $408 target, at Deutsche Bank… BHP Billiton (BHP: 78.97 0.00%) upgraded to [...]