Specialty chemical maker Croda International surged after Deutsche Bank upgraded the stock to 'buy' from 'hold' on expectations that top-line growth will pick up.WPP rallied after the advertising agency said its data investment business Kantar acquired The Benenson Strategy Group, a research and consulting firm.Prudential gained after Moody's Investors Service said the Prudential Financial arm's expansion into Malaysia would provide a platform for life insurance sales in a high-growth region.Temporary power generator Aggreko slumped after rising on Thursday when Westhouse Securities issued a 'buy' rating for the stocks.Standard Life declined following news the company was close to finalising a deal with SimplyBiz for the sale of its 10% stake in in the support services firm.Reckitt Benckiser Group retreated as the firm had its 'reduce' rating reaffirmed by analysts at AlphaValue.FTSE 100 - RisersCroda International (CRDA) 2,701.00p +5.22%WPP (WPP) 1,222.00p +2.60%Prudential (PRU) 1,145.00p +2.14%Tesco (TSCO) 373.10p +2.00%SABMiller (SAB) 3,100.00p +1.89%Johnson Matthey (JMAT) 2,867.00p +1.88%Land Securities Group (LAND) 902.50p +1.80%Glencore Xstrata (GLEN) 319.20p +1.70%International Consolidated Airlines Group SA (CDI) (IAG) 317.00p +1.67%Morrison (Wm) Supermarkets (MRW) 290.90p +1.64%FTSE 100 - FallersAggreko (AGK) 1,618.00p -2.24%Standard Life (SL.) 342.10p -0.98%Reckitt Benckiser Group (RB.) 4,482.00p -0.82%Shire Plc (SHP) 2,417.00p -0.74%Weir Group (WEIR) 2,203.00p -0.54%Imperial Tobacco Group (IMT) 2,151.00p -0.37%Experian (EXPN) 1,165.00p -0.34%RSA Insurance Group (RSA) 123.20p -0.32%Persimmon (PSN) 1,137.00p -0.26%BHP Billiton (BLT) 1,904.50p -0.21%FTSE 250 - RisersEvraz (EVR) 128.30p +7.18%Enterprise Inns (ETI) 144.00p +3.23%Dechra Pharmaceuticals (DPH) 707.00p +3.21%Jardine Lloyd Thompson Group (JLT) 946.00p +3.05%Imagination Technologies Group (IMG) 277.50p +3.01%Ashtead Group (AHT) 676.00p +2.97%Man Group (EMG) 87.20p +2.95%Alent (ALNT) 349.80p +2.88%Keller Group (KLR) 1,115.00p +2.77%Anite (AIE) 112.20p +2.37%RD