Kenmare Resources gained after Goldman Sachs lifted its rating to 'conviction buy' from 'buy'.St. Modwen Properties rallied after JP Morgan reiterated an 'overweight' rating for the company's stocks.Thomas Cook Group fell along with airline and travel stocks after Ryanair issued a profits warning, blaming lower demand in Europe and a weaker currency in its largest market, Britain.Ashtead Group slumped after the equipment rental group sparked concerns over large capital expenditure as it reported first quarter results. FTSE 250 - RisersBumi (BUMI) 223.60p +7.14%Kenmare Resources (KMR) 28.69p +5.48%Fisher (James) & Sons (FSJ) 1,133.00p +3.66%St. Modwen Properties (SMP) 298.00p +3.51%Dechra Pharmaceuticals (DPH) 710.00p +3.20%Hochschild Mining (HOC) 264.80p +2.64%Enterprise Inns (ETI) 148.00p +2.42%Alent (ALNT) 369.50p +2.35%COLT Group SA (COLT) 111.50p +2.01%Evraz (EVR) 128.60p +1.98%FTSE 250 - FallersThomas Cook Group (TCG) 134.00p -6.03%Ashtead Group (AHT) 650.00p -5.45%Barratt Developments (BDEV) 302.30p -4.03%Phoenix Group Holdings (DI) (PHNX) 725.00p -3.97%Berkeley Group Holdings (The) (BKG) 2,076.00p -3.84%Micro Focus International (MCRO) 744.00p -3.44%Mitchells & Butlers (MAB) 433.40p -3.09%Amlin (AML) 378.20p -3.00%Debenhams (DEB) 101.00p -2.88%Taylor Wimpey (TW.) 100.30p -2.72%RD