Chip designer Imagination Tech was a high riser after Morgan Stanley upgraded the stock to 'overweight' and increased its target price from 450p to 570p. PZ Cussons got a boost after JP Morgan upped its target price from 310p to 370p and reiterated a neutral rating.Iron ore pellet producer Ferrexpo saw profits plunge in the first nine months of the year as both prices and demand fell, while costs went up. In the nine months to the end of September, the Ukraine-focused firm reported turnover of $1.08bn, down from $1.31bn the year before. Precision tool maker Renishaw carved out a sharp increase in half yearly earnings, after it was boosted by a string of large consumer electronics orders in China, but cautioned it faces tough financial comparators in the second half. FTSE 250 - RisersImagination Technologies Group (IMG) 493.20p +11.71%Phoenix Group Holdings (DI) (PHNX) 640.00p +8.29%PZ Cussons (PZC) 385.40p +3.27%Oxford Instruments (OXIG) 1,642.00p +3.14%Centamin (DI) (CEY) 54.50p +3.02%COLT Group SA (COLT) 106.10p +2.61%William Hill (WMH) 382.40p +2.25%Inchcape (INCH) 472.60p +1.70%Inmarsat (ISAT) 645.50p +1.65%Hiscox Ltd. (HSX) 474.50p +1.63%FTSE 250 - FallersFenner (FENR) 386.10p -6.51%Ferrexpo (FXPO) 255.70p -5.96%IP Group (IPO) 124.80p -4.95%Chemring Group (CHG) 276.20p -4.73%Renishaw (RSW) 1,869.00p -4.64%Kier Group (KIE) 1,335.00p -4.64%Balfour Beatty (BBY) 267.00p -4.13%Perform Group (PER) 368.00p -3.89%FirstGroup (FGP) 192.60p -3.65%United Drug (UDG) 266.40p -3.44%NR