Home maintenance specialist Homeserve is leading the risers after saying it is extending its US reach with the acquisition of National Grid Energy Services' service contract business.Engineering consultant WS Atkins is a top FTSE 250 riser after it said it has continued to perform strongly and expects full-year results to be slightly ahead of current market forecasts.Lender IPF is also on the up. It returned to the black in the first quarter as it added more customers and saw an improvement in economic conditions.FTSE 250 - RisersHomeserve (HSV) 1,908.00p +6.30%Logica (LOG) 144.00p +4.50%Paragon Group Of Companies (PAG) 155.70p +3.66%Atkins (WS) (ATK) 672.50p +3.54%Ferrexpo (FXPO) 372.70p +3.53%Yell Group (YELL) 52.20p +3.37%Computacenter (CCC) 320.00p +3.23%Spectris (SXS) 861.00p +3.05%International Personal Finance (IPF) 243.90p +3.04%Cable & Wireless Communications (CWC) 61.95p +2.99%FTSE 250 - FallersDomino's Pizza UK & IRL (DOM) 345.00p -3.63%United Business Media (UBM) 534.50p -3.08%Filtrona PLC (FLTR) 216.50p -3.05%RPS Group (RPS) 208.10p -2.30%Connaught (CNT) 272.70p -2.19%TR Property Inv Trust Sigma Shares (TRYS) 71.75p -2.18%Bodycote (BOY) 202.30p -2.13%Salamander Energy (SMDR) 259.40p -1.74%Davis Service Group (DVSG) 422.60p -1.74%Electrocomponents (ECM) 231.00p -1.66%