Stagecoach leads the risers in the FTSE 250 after reporting that pre-tax profits fell by more than a quarter in the six months to October 31 after the rail and bus group was squeezed by reduced demand from recession hit travellers and high fuel costs.The group said it had made a good start to the second half.Spread-betting firm IG Group is posting good gains after saying it expects to report revenue of around £143m (2009: £126.5m) and adjusted profit before tax of around £77m (2009: £58.2m) for the first half of the year.Among other risers is Imagination Technologies. Soaring demand for technology such as in-car navigation and mobile phones sent revenues and profits soaring at the chip designer in the six months to 31 October. Peer ARM Holdings is also higher.FTSE 250 - RisersStagecoach Group (SGC) 157.20p +4.87%IG Group Holdings (IGG) 352.60p +3.74%Debenhams (DEB) 82.80p +3.50%RPS Group (RPS) 209.20p +2.95%Moneysupermarket.com (MONY) 76.10p +2.49%Galiform (GFRM) 80.95p +2.34%Paragon Group Of Companies (PAG) 132.80p +2.31%Imagination Technologies (IMG) 222.10p +2.07%ARM Holdings (ARM) 170.00p +1.92%Ashtead Group (AHT) 67.50p +1.89%FTSE 250 - FallersGame Group (GMG) 108.70p -6.62%Yell Group (YELL) 40.57p -5.65%Renishaw (RSW) 514.50p -4.81%Northgate (NTG) 225.80p -4.73%Premier Foods (PFD) 33.92p -4.72%Bodycote (BOY) 158.10p -4.07%Petropavlovsk (POG) 1,165.00p -3.32%Computacenter (CCC) 258.10p -2.97%Aberdeen Asset Management (ADN) 135.50p -2.87%Bovis Homes Group (BVS) 380.00p -2.81%