Monday broker round-up

Aggreko: UBS ups target from 2,400p to 2,500p, buy rating unchanged.AMEC: Societe Generale upgrades from hold to buy, target hiked from 950p to 1,320p.Antofagasta: Oriel Securities downgrades from add to hold, target cut from 1,294p to 1,258p.Ark Therapeutics: Collins Stewart keeps buy recommendation and 8p target.Balfour Beatty: UBS raises target from 320p to 340p, buy rating unchanged.Barratt Developments: Citi downgrades from neutral to sell, target lifted from 112p to 130p.Bovis Homes: Citi downgrades from buy to neutral, target lifted from 520p to 525p.Carnival: Exane BNP Paribas upgrades from underperform to outperform target lifted from 2,000p to 2,350p.GKN: Investec reiterates buy rating.HSBC: Seymour Pierce downgrades from buy to hold, target slashed from 800p to 600p.Hunting: JP Morgan Cazenove upgrades from underweight to neutral, target lifted from 732p to 998p.JD Wetherspoon: Jefferies maintains buy rating and 600p target.London Stock Exchange: UBS ups target from 900p to 990p, neutral rating kept; Nomura ups target from 925p to 967p, neutral rating unchanged.Man Group: Investec cuts target from 182p to 172p but keeps buy rating; HSBC downgrades from overweight to neutral, target cut from 150p to 140p.Schroders: Deutsche Bank upgrades from sell to hold, target lifted from 1,470p to 1,650p.Standard Chartered: Seymour Pierce downgrades from hold to sell, target maintained at 1,400p target.Weir: Investec keeps buy rating, cuts target from 2,250p to 2,150p.