Imagination Technologies surged after signing a new licence agreement with MediaTek, a semiconductor company for wireless communications and digital multimedia.Bwin.party Digital Entertainment jumped following market chatter that Google may be interested in buying the online gaming company. Pennon Group slumped after Credit Suisse cut its target price to 610p from 670p and changed its rating of the British water utility and waste management firm to 'underperform' from 'neutral'.Polymetal International led miners lower as prices of commodities dragged.FTSE 250 - RisersImagination Technologies Group (IMG) 329.50p +7.19%Bwin.party Digital Entertainment (BPTY) 116.10p +5.64%Fenner (FENR) 405.20p +4.62%Barratt Developments (BDEV) 329.40p +4.57%Bumi (BUMI) 208.50p +4.20%TalkTalk Telecom Group (TALK) 258.90p +3.98%Crest Nicholson Holdings (CRST) 336.60p +3.57%Ashtead Group (AHT) 650.50p +2.44%Xaar (XAR) 787.50p +1.94%BH Global Ltd. USD Shares (BHGU) 11.84 +1.89%FTSE 250 - FallersPennon Group (PNN) 697.50p -3.99%Polymetal International (POLY) 706.00p -3.95%Lonmin (LMI) 330.90p -3.67%African Barrick Gold (ABG) 162.10p -3.28%Kenmare Resources (KMR) 27.52p -2.48%Centamin (DI) (CEY) 43.41p -2.45%Dairy Crest Group (DCG) 481.40p -2.39%ICAP (IAP) 403.90p -2.27%Perform Group (PER) 559.00p -1.93%Hochschild Mining (HOC) 272.60p -1.87%FTSE TechMARK - RisersAntisoma (ASM) 1.45p +5.45%XP Power Ltd. (DI) (XPP) 1,374.00p +4.09%BATM Advanced Communications Ltd. (BVC) 15.50p +3.33%Optos (OPTS) 150.75p +3.25%Phoenix IT Group (PNX) 160.00p +3.23%NCC Group (NCC) 153.00p +1.49%Vectura Group (VEC) 112.50p +1.35%E2V Technologies (E2V) 138.00p +1.10%Skyepharma (SKP) 83.00p +0.61%Ricardo (RCDO) 531.00p +0.57%RD