Friday broker round-up UPDATE

African Minerals: Barclays initiates with a target price of 220p and an underweight rating.Aviva: Exane downgrades to neutral with a target price of 403p.Avon Rubber: Investec ups target price from 470p to 500p, but downgrades from add to hold.AZ Electronic Materials: Deutsche Bank reduces target price from 380p to 350p and retains a hold recommendation. Canaccord Genuity cuts target price from 414p to 389p, while its buy recommendation remains unaltered.Balfour Beatty: Liberum Capital increases target price from 190p to 250p and upgrades to buy.BHP Billiton: JP Morgan cuts target price from 2340p to 2310p and keeps a neutral rating.Cineworld Group: JP Morgan ups target price from 368p to 428p maintaining an overweight rating.Derwent London: Exane moves target price from 2300p to 2360p, while its neutral rating remains unchanged.Ferrexpo: Barclays initiates with a target price of 200p and an underweight rating.GemDiamonds: Goldman Sachs shifts target price from 175p to 180p and maintains a buy recommendation.GlaxoSmithKline: Bank of America raises target price from 1910p to 2050p and reiterates a buy recommendation.Gulf Keystone Petroleum: Goldman Sachs downgrades to neutral with its target price at 265p.Imperial Tabacco: Bank of America cuts target price from 2380p to 2300p, while keeping a neutral rating.London Mining: Barclays initiates with a target price of 110p and an underweight rating.Ophir Energy: Credit Suisse reduces target price from 604p to 550p retaining an outperform rating. Exane lowers target price from 570p to 540p and stays with its outperform rating. Canaccord Genuity cuts target price from 425p to 374p and reiterates a hold recommendation.Pearson: Morgan Stanley moves target price from 1215p to 1225p, while maintaining an underweight rating.Prudential: Nomura increases target price from 1392p to 1487p leaving its buy recommendation unchanged.Resolution: Oriel Securities raises target price from 285p to 340p keeping its hold recommendation.Royal Bank of Scotland: Investec downgrades from hold to sell with a target price of 340p.Talvivaara Mining: JP Morgan shifts target price from 13p to 12p and stays with its neutral rating.WPP Group: Liberum Capital takes target price from 1180p to 1300p and keeps its buy recommendation. Balfour Beatty Prudential Pearson Avon Protection Gem Diamonds Di Gulf Keystone Petroleum Ferrexpo Glaxosmithkline WPP Derwent London