Ferrexpo, was one of the high risers after the firm was upgraded from neutral to buy by UBS.The broker notes that the stock - while being up 34% from the 52-week low of 238.7p on 4 October on the back of mergers & acquisition speculation - is still down 35% from the high of 499p in July. Ophir Energy was heading lower after announcing offer terms for Dominion's convertible loan note holders who have yet to sell out to the firm. Information technology services provider Computacenter lacks support despite being on track to meet its full-year targets after third quarter continued on much the same lines as the first two quarters. Panmure Gordon reiterated its sell rating and 95p target on Home Retail, sending the firm's share price lower. FTSE 250 - RisersPremier Foods (PFD) 4.48p +7.69%Ferrexpo (FXPO) 333.00p +5.38%Hunting (HTG) 640.00p +4.92%Thomas Cook Group (TCG) 51.35p +4.80%Domino Printing Sciences (DNO) 508.00p +4.06%Renishaw (RSW) 897.00p +4.06%Petropavlovsk (POG) 677.50p +3.91%Centamin Egypt Ltd. (CEY) 102.20p +3.65%Pace (PIC) 95.25p +3.59%Logica (LOG) 88.00p +3.47%FTSE 250 - FallersMothercare (MTC) 202.40p -2.88%Ophir Energy (OPHR) 230.00p -2.42%Allied Gold Mining (ALD) 161.60p -2.42%Elementis (ELM) 133.00p -2.06%AZ Electronic Materials SA (WI) (AZEM) 243.80p -1.97%Bankers Inv Trust (BNKR) 374.80p -1.81%Bwin.party Digital Entertainment (BPTY) 110.10p -1.61%Computacenter (CCC) 376.10p -1.60%Home Retail Group (HOME) 129.40p -1.52%F&C Commercial Property Trust Ltd. (FCPT) 96.00p -1.49%NR