Investors are taking a punt on IG Group after the spread-betting firm said it expects to post a strong rise in profits for the 12 months to March 31 after a good finish to the year.Adjusted pre-tax profits should come in at £125m, compared with £98m the previous year, on revenues that climb to £257m from £184m, the firm said.Investors have given a warm reception to Heritage Oil's plans to merge with Turkish exploration and production group Genel to create an oil company big enough to join London's FTSE 100 index.Among the fallers, PZ Cussons is lower ahead of the soap maker's trading statement tomorrow.FTSE 250 - RisersGKN (GKN) 133.00p +8.35%IG Group Holdings (IGG) 235.75p +8.27%Fisher (James) & Sons (FSJ) 473.00p +8.24%Dunelm (DNLM) 244.00p +5.86%Spectris (SXS) 536.50p +5.20%Hansard Global (HSD) 136.25p +4.81%Misys (MSY) 166.00p +4.57%Heritage Oil (HOIL) 609.50p +4.19%Tullett Prebon (TLPR) 318.50p +3.41%Bodycote (BOY) 153.00p +3.38%FTSE 250 - FallersBerkeley Group Holdings Units (BKG) 770.00p -6.67%PZ Cussons (PZC) 178.75p -5.55%Taylor Wimpey (TW.) 36.75p -3.92%Shaftesbury (SHB) 304.00p -3.87%Emerald Energy (EEN) 556.00p -3.56%Bovis Homes Group (BVS) 406.50p -3.44%Filtrona PLC (FLTR) 119.50p -3.43%Melrose Resources (MRS) 276.00p -3.16%Helical Bar (HLCL) 329.25p -3.16%Great Portland Estates (GPOR) 240.25p -3.13%