National Express shares have motored ahead after announcing a consortium, which includes CVC Capital Partners and the Cosmen family, is prepared to pay 450p a share in cash for the bus and trains operator.Oil service firm Hunting is going strong after it saw profits rise for the half-year due to higher interest income and raised dividends by 21%.Engineer IMI leads the way after it reported better-than-expected first-half results and said underlying levels of demand appear to have stabilised.Chaucer is in demand after a big increase in investment returns helped the underwriter quadruple half-year profit, much better than predicted. Turning to the fallers, property group Segro gave back some of its recent gains today after revealing interim losses grew to almost half a billion pounds.Investors are betting against 888 Holdings today, after the online gaming firm saw profits slide in the half year and said it is trading "solidly" despite consumer sentiment remaining weak and currencies still volatile.FTSE 250 - RisersIMI (IMI) 455.20p +13.40%Hunting (HTG) 485.50p +6.12%Filtrona PLC (FLTR) 165.00p +5.43%Peter Hambro Mining (POG) 742.50p +4.65%Chaucer Holdings (CHU) 46.73p +3.84%Charter International (CHTR) 622.00p +3.67%Moneysupermarket.com (MONY) 85.45p +2.77%National Express Group (NEX) 410.00p +2.50%AG Barr (BAG) 1,346.00p +2.20%Ashtead Group (AHT) 80.45p +1.96%FTSE 250 - FallersSavills (SVS) 338.90p -8.41%888 Holdings (888) 87.05p -7.74%Morgan Crucible (MGCR) 154.00p -4.94%Aquarius Platinum Ltd. (AQP) 254.80p -4.78%SEGRO (SGRO) 349.50p -4.53%Ashmore Group (ASHM) 233.40p -4.46%BlueBay Asset Management (BBAY) 273.50p -4.20%Derwent London (DLN) 1,165.00p -4.12%CSR (CSR) 461.40p -3.88%Bovis Homes Group (BVS) 533.50p -3.87%