IMI's shares rallied after the engineering company forecast an improvement in trading for the second half as it takes on higher-margin contracts at its severe service business.Wolseley gained after UBS upgraded its stocks to 'buy' from 'neutral' ahead of its results, saying "our analysis of US peers that have reported on second quarter suggests Wolseley's growth should have accelerated to double digit growth in fourth quarter to July".Vedanta Resources rebounded following a slump on Wednesday after reports four Indian tribal councils voted against the company's plan to mine bauxite in eastern India's Niyamgiri Hills.Eurasian Natural Resources Corp. was the biggest faller after copper miner Kazakhymys sold its 26% stake in the company.Credit checker Experian retreated amid a lawsuit against the company in the US by an individual over claims of an incorrect credit report. Sugar producer Tate & Lyle slumped after Sucden Financial said last night's "terrible close" on sugar bulls would continue through today.FTSE 100 - RisersIMI (IMI) 1,484.00p +5.32%Wolseley (WOS) 3,326.00p +4.13%Vedanta Resources (VED) 1,203.00p +3.71%RSA Insurance Group (RSA) 124.30p +3.58%Glencore Xstrata (GLEN) 314.10p +3.07%International Consolidated Airlines Group SA (CDI) (IAG) 312.80p +2.93%Royal Bank of Scotland Group (RBS) 342.40p +2.48%Aberdeen Asset Management (ADN) 365.10p +2.47%BHP Billiton (BLT) 1,917.00p +2.35%Fresnillo (FRES) 1,190.00p +2.23%FTSE 100 - FallersEurasian Natural Resources Corp. (ENRC) 224.90p -0.97%Experian (EXPN) 1,172.00p -0.93%Tate & Lyle (TATE) 809.50p -0.55%Hargreaves Lansdown (HL.) 993.50p -0.30%National Grid (NG.) 738.50p -0.20%Intertek Group (ITRK) 3,231.00p -0.19%WPP (WPP) 1,189.00p -0.17%Burberry Group (BRBY) 1,584.00p -0.13%Petrofac Ltd. (PFC) 1,233.00p -0.08%RD