Shares in IMI have jumped after the engineer said it expects earnings this year to come in "materially higher" than previously forecast as higher margins have offset a sharp fall in revenues.JKX Oil & Gas is higher after saying oil and gas production levels were both higher in the third quarter. Total production in the third quarter of 2009 rose to 13,657 barrels of oil equivalent per day (boepd), up 24% from 10,978 boepd in the same period of 2008.The firm is also lifted by higher crude prices as are oil firms such as Melrose Resources and Heritage Oil.FTSE 250 - RisersIMI (IMI) 512.50p +11.46%Yell Group (YELL) 47.02p +6.50%Cookson Group (CKSN) 393.10p +5.39%Punch Taverns (PUB) 92.70p +5.22%Ferrexpo (FXPO) 167.50p +4.56%Melrose Resources (MRS) 340.30p +4.04%Chloride Group (CHLD) 172.50p +3.98%F&C Asset Management (FCAM) 76.45p +3.80%JKX Oil & Gas (JKX) 290.40p +3.71%Heritage Oil (HOIL) 459.80p +3.65%FTSE 250 - FallersForth Ports (FPT) 1,150.00p -3.20%Fidessa (FDSA) 1,221.00p -2.79%Stobart Group (STOB) 124.50p -2.73%Berkeley Group Holdings Units (BKG) 833.00p -2.63%Filtrona PLC (FLTR) 176.20p -2.11%Barratt Developments (BDEV) 135.90p -2.02%JPMorgan Japanese Inv Trust (JFJ) 140.90p -1.95%Bellway (BWY) 752.00p -1.83%Genus (GNS) 637.50p -1.62%Melrose (MRO) 184.20p -1.60%