Steel maker Evraz's shares soared after Markit's purchasing managers' index showed China's manufacturing sector hit a four-month high in August as orders rebounded. Ashtead Group gained after UBS reiterated a 'buy' rating for the equipment rental group's stock.Afren declined after the oil explorer said first-half net income dropped to $79.6m from $100.7m.Premier Oil continued to reel after reporting half-year results that fell short of expectations on Thursday.FTSE 250 - RisersEvraz (EVR) 128.60p +7.44%Dechra Pharmaceuticals (DPH) 711.50p +3.87%Ashtead Group (AHT) 681.50p +3.81%Imagination Technologies Group (IMG) 278.40p +3.34%African Barrick Gold (ABG) 164.40p +3.14%Jardine Lloyd Thompson Group (JLT) 946.00p +3.05%Keller Group (KLR) 1,118.00p +3.04%Alent (ALNT) 349.70p +2.85%Enterprise Inns (ETI) 143.30p +2.72%IG Group Holdings (IGG) 569.50p +2.61%FTSE 250 - FallersITE Group (ITE) 287.70p -2.97%NMC Health (NMC) 340.50p -2.71%Afren (AFR) 142.20p -2.54%Tullett Prebon (TLPR) 334.90p -2.02%Barr (A.G.) (BAG) 560.00p -1.23%Premier Oil (PMO) 343.00p -1.01%Soco International (SIA) 370.20p -0.96%LondonMetric Property (LMP) 111.30p -0.89%Hikma Pharmaceuticals (HIK) 1,080.00p -0.83%Carpetright (CPR) 665.00p -0.82%RD