Serco regained some of yesterday's losses, which saw shares dive as investors reacted to a profit warning in which the company predicted that 2014 profits would fall as much as 20 per cent short of the 277m pounds that the market had expected. Domino's Pizza was another high riser after saying that Senior Non-Executive Director David Wild will be acting as Chief Executive until a replacement for Lance Batchelor is found. A positive note from Credit Suisse also helped as the bank upgraded the stock to 'outperform' from 'neutral'.Rank Group put in a modest rise after it reported a boost to group revenue of 16% to £352.4m and predicted an improved performance in the second half. Meanwhile, web and technology business Premier Farnell fell sharply after warning that margins would be flat next year. Broker Jefferies said that top-line growth in the quarter was better than expected, but that had not translated into positive operational leverage.Banknote printer De La Rue also fell after it said it had experienced tough conditions in both of its divisions, with the pricing environment in the printed banknote and paper markets reflecting the overcapacity in the banknote paper market. It added that trading remained "disappointing" in its Cash Processing Solutions business. FTSE 250 - RisersSerco Group (SRP) 444.70p +5.08%Keller Group (KLR) 1,184.00p +3.86%Domino's Pizza Group (DOM) 532.50p +3.60%Dechra Pharmaceuticals (DPH) 700.00p +2.94%Brewin Dolphin Holdings (BRW) 302.20p +2.34%Howden Joinery Group (HWDN) 341.40p +1.73%BH Global Ltd. USD Shares (BHGU) 11.75 +1.73%Kazakhmys (KAZ) 174.40p +1.69%Hellermanntyton Group (HTY) 294.80p +1.66%Daejan Holdings (DJAN) 4,810.00p +1.52%FTSE 250 - FallersPremier Farnell (PFL) 215.80p -7.82%Essar Energy (ESSR) 57.75p -4.47%Vedanta Resources (VED) 800.50p -4.42%Ferrexpo (FXPO) 150.30p -4.02%Imagination Technologies Group (IMG) 171.40p -3.87%Unite Group (UTG) 401.20p -3.46%Spirent Communications (SPT) 94.00p -3.39%Intu Properties (INTU) 315.80p -3.13%International Personal Finance (IPF) 461.00p -2.87%UBM (UBM) 676.50p -2.73%NR