Fund manager Man Group advanced today after the Financial Times reported that it has moved 1.5bn dollars of its flagship fund AHL into a new portfolio in order to raise returns. Chemring was higher after it was reported that a subsidiary of the company was awarded a $4.4m contract for the manufacture of decoy devices for the US Air Force. Defence group Cobham rose after its aviation division secured a multi-million dollar extension on a contract to fly miners to remote parts of Western Australia. Ferrexpo was higher, which could be linked the an analyst dinner held last night during which discussions were held with the Chief Executive Officer, Chief Financial Officer and the Chairman focused on Ukrainian politics and its economy, the iron ore market and the business in general. FT Alphaville cited a note from Numis which said these affirmed its view that "this conservative business [...] continues to drive itself up the product quality chain and down the cost curve".Talvivaara shares have dropped one day after the company received a permit to restart the metals recovery plant at its Sotkamo nickel mine where it suffered a leak. It said it expects full production to resume by November 25th. FTSE 250 - RisersMan Group (EMG) 77.25p +5.75%Chemring Group (CHG) 227.00p +4.61%Fenner (FENR) 387.00p +3.20%Dixons Retail (DXNS) 25.78p +3.12%Cobham (COB) 202.30p +2.95%Heritage Oil (HOIL) 194.70p +2.80%Lonmin (LMI) 299.60p +2.57%Ferrexpo (FXPO) 213.20p +2.55%Soco International (SIA) 370.00p +2.44%BTG (BTG) 349.30p +2.37%FTSE 250 - FallersTalvivaara Mining Company (TALV) 99.90p -3.76%Centamin (DI) (CEY) 65.70p -3.10%Redrow (RDW) 154.60p -2.95%Euromoney Institutional Investor (ERM) 767.00p -2.73%Mitchells & Butlers (MAB) 329.30p -2.28%Pace (PIC) 180.80p -2.11%New World Resources A Shares (NWR) 223.10p -1.85%PayPoint (PAY) 860.50p -1.83%Bumi (BUMI) 262.00p -1.80%Kentz Corporation Ltd. (KENZ) 370.50p -1.78%NR