AMEC: Nomura ups target price from 1230p to 1280p and retains a buy recommendation.Amerisur Resources: Investec shifts target price from 73p to 75p and keeps a buy recommendation.AVEVA: Investec increases target price from 2500p to 2900p upgrading from hold to buy.BHP Billiton: JP Morgan raises target price from 2150p to 2250p leaving its neutral rating unchanged.Blinkx: Jefferies downgrades from buy to hold with a target price of 190p.CSR: JP Morgan raises target price from 650p to 750p and retains an overweight rating.Greenko Group: Investec initiates with a target price of 275p and a buy recommendation.Marston's: WH Ireland upgrades to buy.Mears Group: Investec ups target price from 440p to 495p, but downgrades from buy to add.Moneysupermarket: Westhouse Securities moves target price from 209p to 220p and reiterates an add rating.Moss Bros: WH Ireland ups target price from 85p to 110p and maintains its buy recommendation.Nichols: Investec raises target price from 890p to 1055p, while downgrading to sell.Optimal Payment: Berenberg increases target price from 452p to 520p and keeps a buy recommendation.Royal Bank of Scotland: RBS Capital cuts target price from 375p to 310p downgrading to underperform.Royal Mail: JP Morgan initiates with a target price of 700p and an overweight rating.Smith & Nephew: Jefferies raises target price from 900p to 1000p and keeps a buy recommendation.