Shares in interdealer broker Tullett Prebon fall sharply after it said revenue fell 9% to £302m during the past four months. Business has continued to be "robust" since the end of June though, the firm said.Trinity Mirror falls back after good gains yesterday when it said advertising declines were slowing.Animal breeding group Genus has recovered slightly after a sharp fall yesterday when it said first half profits at constant currency are expected to be lower than last yea as conditions in US agricultural markets appear to have deteriorated further.FTSE 250 - RisersGenus (GNS) 601.00p +5.44%Helical Bar (HLCL) 374.40p +5.14%Bodycote (BOY) 190.00p +4.80%Grainger (GRI) 294.90p +4.69%Inchcape (INCH) 32.61p +4.59%Marston's (MARS) 86.85p +3.58%Persimmon (PSN) 458.30p +3.45%Taylor Wimpey (TW.) 41.85p +3.33%RPS Group (RPS) 216.70p +3.24%Big Yellow Group (BYG) 424.70p +2.61%FTSE 250 - FallersTullett Prebon (TLPR) 354.50p -11.22%Trinity Mirror (TNI) 168.90p -4.95%Petropavlovsk (POG) 1,240.00p -2.82%Avis Europe (AVE) 26.23p -2.42%Micro Focus International Plc (MCRO) 412.10p -2.42%Yell Group (YELL) 45.50p -2.15%Ecofin Water & Power Opportunities (ECWO) 145.00p -2.03%BTG (BGC) 171.60p -1.66%Croda International (CRDA) 772.50p -1.15%Daejan Holdings (DJAN) 3,015.00p -1.15%