Forth Ports is leading the risers after agreeing to let its major shareholder Arcus Capital go through its books ahead of a possible £16.30 bid that would value the Scotland-based port group at just shy of £750m. Conveyor belt maker Fenner said that the sharp increase in profitability experienced in the first quarter has been maintained to the half year end, sending shares higher.BBA Aviation is higher after UBS upgraded the group to a 'buy', from 'neutral', saying that "with the shares having fallen due to the share placing we view this as a buying opportunity".Recruitment firm Michael Page International is off the mark despite revenues growing by 16.1% to £832m in 2010.FTSE 250 - RisersForth Ports (FPT) 1,602.00p +5.19%Imagination Technologies Group (IMG) 470.30p +4.00%Hochschild Mining (HOC) 670.50p +3.95%Heritage Oil (HOIL) 280.80p +3.62%SDL (SDL) 655.00p +3.39%Fenner (FENR) 351.40p +3.05%Hansen Transmissions International NV (DI) (HSN) 41.21p +3.02%Kesa Electricals (KESA) 130.20p +2.84%BBA Aviation (BBA) 210.00p +2.44%Croda International (CRDA) 1,646.00p +2.36%FTSE 250 - FallersComputacenter (CCC) 419.00p -3.08%Ocado Group (OCDO) 206.20p -2.96%Howden Joinery Group (HWDN) 112.50p -2.43%Informa (INF) 426.20p -2.25%Travis Perkins (TPK) 1,005.00p -2.24%PartyGaming (PRTY) 184.90p -2.17%Hikma Pharmaceuticals (HIK) 744.00p -2.11%Lancashire Holdings (LRE) 606.00p -2.02%AZ Electronic Materials SA (WI) (AZEM) 304.90p -1.61%Michael Page International (MPI) 527.00p -1.59%Psion (PON) 90.50p -0.55%