Shares in chemicals group AZ Electronic Materials surged today by around 14 per cent, though this only slightly made up for the near-35 per cent slump yesterday after a profit warning. UBS upgraded the stock from 'neutral' to 'buy' this morning, saying that yesterday's sell-off was overdone and that the investment case remains intact. Retailer and car maintenance group Halfords also rose after it revealed that it will deliver profits in line with expectations for the year to end-March, although the extended winter had dampened sales in the new period. Engineer WS Atkins was heading higher after saying that full-year results would come in ahead of expectations thanks to stronger second-half margins in the UK and US. FTSE 250 - RisersAZ Electronic Materials SA (DI) (AZEM) 272.70p +13.62%Kazakhmys (KAZ) 415.50p +5.59%Ferrexpo (FXPO) 194.70p +5.30%Halfords Group (HFD) 332.80p +5.28%Supergroup (SGP) 680.50p +5.26%FirstGroup (FGP) 216.60p +4.79%Man Group (EMG) 97.95p +4.54%Paragon Group Of Companies (PAG) 323.00p +4.36%Imagination Technologies Group (IMG) 461.40p +4.22%Barratt Developments (BDEV) 278.50p +4.15%FTSE 250 - FallersRPS Group (RPS) 263.80p -3.79%Morgan Advance Materials (MGAM) 277.00p -3.65%Berendsen (BRSN) 749.00p -2.47%Amlin (AML) 415.30p -2.17%Ophir Energy (OPHR) 441.50p -2.00%Moneysupermarket.com Group (MONY) 182.90p -1.93%Dunelm Group (DNLM) 832.00p -1.89%Petra Diamonds Ltd.(DI) (PDL) 117.10p -1.84%Betfair Group (BET) 684.00p -1.51%Hochschild Mining (HOC) 285.10p -1.38%NR