There are some big risers on the FTSE 250 today, led by instruments group Spectris which is up 13% after doubling profits in 2010.Following suit with strong full-year figures is textile rental group Berendsen and bingo hall and casino operator Rank.Rightmove was also among the risers despite revenues and profits coming in a shade shy of market expectations. Nevertheless, the results still set new records for the property web site.Defence firm Cobham was wanted after winning a contract with US aircraft maker Boeing.Heading the other way is grocery delivery group Ocado, whose shares have lost almost a quarter in the last week. On Monday, sentiment was hit amid fears that a new delivery service operated by its main customer Waitrose could hurt sales.EnQuest is among the hardest fallers as oil prices began to ease downwards after Saudi Arabia announced it had the ability to meet any shortfall stemming from the Libyan crisis. EnQuest was the highest riser on the index yesterday amid surging prices.FTSE 250 - RisersSpectris (SXS) 1,412.00p +12.87%Kenmare Resources (KMR) 37.50p +8.04%Berendsen (BRSN) 480.00p +6.67%Rank Group (RNK) 133.20p +6.56%Taylor Wimpey (TW.) 38.16p +5.30%Rightmove (RMV) 899.50p +4.96%Bodycote (BOY) 300.50p +4.89%IG Group Holdings (IGG) 443.40p +4.82%SIG (SHI) 130.40p +4.74%Cobham (COB) 226.70p +4.71%FTSE 250 - FallersSt. Modwen Properties (SMP) 169.60p -2.81%Ocado Group (OCDO) 199.60p -2.63%EnQuest (ENQ) 140.80p -2.09%Hansen Transmissions International NV (DI) (HSN) 49.01p -1.98%Cable & Wireless Communications (CWC) 47.52p -1.37%Computacenter (CCC) 424.30p -1.33%Mcbride (MCB) 143.00p -1.24%BH Global Ltd. USD Shares (BHGU) 10.72 -1.20%Helical Bar (HLCL) 272.90p -1.05%Lancashire Holdings (LRE) 594.00p -1.00%FTSE TechMARK - RisersArk Therapeutics Group (AKT) 4.70p +4.44%E2V Technologies (E2V) 113.50p +3.18%Antisoma (ASM) 2.89p +2.30%Timeweave (TMW) 23.00p +2.22%Xaar (XAR) 215.00p +2.14%Dialight (DIA) 620.50p +1.97%Alterian (ALN) 183.50p +1.38%Microgen (MCGN) 140.00p +0.72%Corin Group (CRG) 49.00p 0.00%Asterand (ATD) 17.50p 0.00%FTSE TechMARK - FallersSkyepharma (SKP) 35.25p -4.73%Optos (OPTS) 190.00p -3.80%NCC Group (NCC) 545.00p -3.50%KCOM Group (KCOM) 60.75p -3.19%Kewill (KWL) 90.25p -2.43%Promethean World (PRW) 57.75p -2.12%BATM Advanced Communications Ltd. (BVC) 25.00p -1.96%Innovation Group (TIG) 15.25p -1.61%Psion (PON) 92.25p -1.60%Wolfson Microelectronics (WLF) 286.75p -1.12%