BTG is on of the heaviest fallers despite yesterday's announcement that the speciality pharmaceuticals developer expects its recurring revenues will grow by £5m following the Biocompatibles acquisition. IG Group is following suit after the its was reported yesterday that the spreadbet firm has one month to pay £4m into the Financial Services Compensation Scheme to help refund retail investors who lost money they had in firms that collapsed last year.Housebuilders Redrow and Barratt Developments are also providing a drag on the index.Wind turbine gearbox manufacturer Hansen Transmissions International and internet gambling firm PartyGaming are the high risers.FTSE 250 - RisersHansen Transmissions International NV (DI) (HSN) 57.75p +6.94%PartyGaming (PRTY) 195.20p +5.00%Telecity Group (TCY) 496.90p +4.61%Ferrexpo (FXPO) 439.50p +3.44%Homeserve (HSV) 445.40p +2.79%Supergroup (SGP) 1,548.00p +2.45%St James's Place (STJ) 307.00p +2.33%Spectris (SXS) 1,340.00p +2.29%Ocado Group (OCDO) 221.00p +2.27%AZ Electronic Materials SA (WI) (AZEM) 298.00p +2.26%FTSE 250 - FallersRedrow (RDW) 117.30p -5.33%BTG (BGC) 231.10p -5.29%Barratt Developments (BDEV) 91.85p -5.11%IG Group Holdings (IGG) 439.30p -4.87%Persimmon (PSN) 401.00p -4.27%Bellway (BWY) 611.00p -4.23%Centamin Egypt Ltd. (CEY) 130.30p -4.12%Lamprell (LAM) 300.70p -3.96%Debenhams (DEB) 65.15p -3.91%Spirent Communications (SPT) 137.00p -3.52%